Mdx321 on my jdm?
Thread Starter
Scooby Regular
Joined: Oct 2014
Posts: 6,082
Likes: 131
From: P1234x
Mdx321 on my jdm?
hey all need some advice please 
what overall difference would a mdx321 turbo make on my impreza jdm twinscroll?
it has turbo back decat,in wing induction, no injector upgrade as yet running 330bhp at the moment
Been meaning to travel down the power route since last year not chasing figures etc just make it abit faster on mid and take off not after top end power
is it worth going down this route as I certeinly don’t want it to go laggy?
all opinions and advice appreciated
what overall difference would a mdx321 turbo make on my impreza jdm twinscroll?
it has turbo back decat,in wing induction, no injector upgrade as yet running 330bhp at the moment
Been meaning to travel down the power route since last year not chasing figures etc just make it abit faster on mid and take off not after top end power
is it worth going down this route as I certeinly don’t want it to go laggy?
all opinions and advice appreciated
Thread Starter
Scooby Regular
Joined: Oct 2014
Posts: 6,082
Likes: 131
From: P1234x
Sorry to sound numb what’s differences in t and v?
you not so far from me then lol! That’s very clean almost made me buy it looking at the condition it’s in I was checking it out this morning but I don’t have a clue on turbos but I’m biting the bullet in March April time probably bigger injectors aswell
Ive been meaning to go down this route and will be doing in March
just trying to get all the answers and advice I need etc because I’m only doing it once and properly
Ive been meaning to go down this route and will be doing in March
just trying to get all the answers and advice I need etc because I’m only doing it once and properly
Scooby Regular
Joined: Apr 2005
Posts: 222
Likes: 1
i needed quick response so went back to std vf36 on my spec c as the car came with a vf37 due to the original vf36 failing. the mdx is an animal. it made full power at 4.5 rpm on my twinscroll 2.0ltr that was 380bhp but a 1.4bar. the turbo really needs 1.7 bar and above to come alive. i am told boost response will remain at the same rpm but power will go up around 100bhp/ so 480 at 1.7bar at 4500rpm
That going to be laggy a similar turbo to my Own Owens/litchfield hybrid
looking at some of the graphs on the clinic website what about a ts sc38 or 42 or something similar
looking at some of the graphs on the clinic website what about a ts sc38 or 42 or something similar
Trending Topics
Scooby Regular
Joined: Dec 2016
Posts: 137
Likes: 2
From: Rushden, Northants
Hello Zany mate.
I investigated going down a different turbo from the standard option on my 2.0 JDM when I was in need of a new turbo at the beginning of the year. I wanted more power (something around the 400-450bhp) but wasn’t prepaired to give up too much revs to achieve it and as we all know that’s impossible.
After much time spent researching I was all set to invest in an LM400 until the car was in for something else with my tuner and long story short he talked me out of it. For the expense it’d cost me it wasn’t worth the little gain it would give me, and I’d miss the early spool a standard turbo would give.
In the end I had my VF37 rebuilt and had a billet wheel with more blades added for good measure. This meant the turbo was more efficient and was able to make more boost easier. Once it was mapped (although not night and day) it made a difference. Plus the boost came in earlier and pulled for longer in the rev range too making it a far more drivable car. Remember the first time you had your car mapped (assuming yours has been) when you drove it for the first time afterwards how much smoother and just generally better it felt and all because of a simple remap? Well it was the same feeling again with the new turbo set up.
The more time that passed and the more people I talked to it seemed it was a good call. A fellow forum member I’ve dealt with has a LM450 and front mount on a very sorted car and he’s talking about changing his set up back to a VF36 and top mount. In his words a friend of his who he often drives with has a similar setup and as a point to point/corner to corner car his set up leaves the LM450 set up for dead. On a long straight yeah the LM450 has a big advantage but by the time his turbo has spooled up and he starts to real the other car in its too late, the other car has too big of a lead and the next corner is here already. All that power but he couldn’t use it.
As a daily driver around nice B roads it’s the less laggy turbo you want not big BHP and numbers so it depends on what YOU want. If you’re after big numbers then get a big turbo but as a daily driver on UK roads...
There are many far more intelligent people than me that can offer advice or their opinion on the what’s what of turbos, with various options and graphs to back it all up but above is what I did when I was looking for what you are now and I’m very happy with the way it turned out. I hope it’s of some help to you mate.
Binny
I investigated going down a different turbo from the standard option on my 2.0 JDM when I was in need of a new turbo at the beginning of the year. I wanted more power (something around the 400-450bhp) but wasn’t prepaired to give up too much revs to achieve it and as we all know that’s impossible.
After much time spent researching I was all set to invest in an LM400 until the car was in for something else with my tuner and long story short he talked me out of it. For the expense it’d cost me it wasn’t worth the little gain it would give me, and I’d miss the early spool a standard turbo would give.
In the end I had my VF37 rebuilt and had a billet wheel with more blades added for good measure. This meant the turbo was more efficient and was able to make more boost easier. Once it was mapped (although not night and day) it made a difference. Plus the boost came in earlier and pulled for longer in the rev range too making it a far more drivable car. Remember the first time you had your car mapped (assuming yours has been) when you drove it for the first time afterwards how much smoother and just generally better it felt and all because of a simple remap? Well it was the same feeling again with the new turbo set up.
The more time that passed and the more people I talked to it seemed it was a good call. A fellow forum member I’ve dealt with has a LM450 and front mount on a very sorted car and he’s talking about changing his set up back to a VF36 and top mount. In his words a friend of his who he often drives with has a similar setup and as a point to point/corner to corner car his set up leaves the LM450 set up for dead. On a long straight yeah the LM450 has a big advantage but by the time his turbo has spooled up and he starts to real the other car in its too late, the other car has too big of a lead and the next corner is here already. All that power but he couldn’t use it.
As a daily driver around nice B roads it’s the less laggy turbo you want not big BHP and numbers so it depends on what YOU want. If you’re after big numbers then get a big turbo but as a daily driver on UK roads...
There are many far more intelligent people than me that can offer advice or their opinion on the what’s what of turbos, with various options and graphs to back it all up but above is what I did when I was looking for what you are now and I’m very happy with the way it turned out. I hope it’s of some help to you mate.
Binny
Thread Starter
Scooby Regular
Joined: Oct 2014
Posts: 6,082
Likes: 131
From: P1234x
Hello Zany mate.
I investigated going down a different turbo from the standard option on my 2.0 JDM when I was in need of a new turbo at the beginning of the year. I wanted more power (something around the 400-450bhp) but wasn’t prepaired to give up too much revs to achieve it and as we all know that’s impossible.
After much time spent researching I was all set to invest in an LM400 until the car was in for something else with my tuner and long story short he talked me out of it. For the expense it’d cost me it wasn’t worth the little gain it would give me, and I’d miss the early spool a standard turbo would give.
In the end I had my VF37 rebuilt and had a billet wheel with more blades added for good measure. This meant the turbo was more efficient and was able to make more boost easier. Once it was mapped (although not night and day) it made a difference. Plus the boost came in earlier and pulled for longer in the rev range too making it a far more drivable car. Remember the first time you had your car mapped (assuming yours has been) when you drove it for the first time afterwards how much smoother and just generally better it felt and all because of a simple remap? Well it was the same feeling again with the new turbo set up.
The more time that passed and the more people I talked to it seemed it was a good call. A fellow forum member I’ve dealt with has a LM450 and front mount on a very sorted car and he’s talking about changing his set up back to a VF36 and top mount. In his words a friend of his who he often drives with has a similar setup and as a point to point/corner to corner car his set up leaves the LM450 set up for dead. On a long straight yeah the LM450 has a big advantage but by the time his turbo has spooled up and he starts to real the other car in its too late, the other car has too big of a lead and the next corner is here already. All that power but he couldn’t use it.
As a daily driver around nice B roads it’s the less laggy turbo you want not big BHP and numbers so it depends on what YOU want. If you’re after big numbers then get a big turbo but as a daily driver on UK roads...
There are many far more intelligent people than me that can offer advice or their opinion on the what’s what of turbos, with various options and graphs to back it all up but above is what I did when I was looking for what you are now and I’m very happy with the way it turned out. I hope it’s of some help to you mate.
Binny
I investigated going down a different turbo from the standard option on my 2.0 JDM when I was in need of a new turbo at the beginning of the year. I wanted more power (something around the 400-450bhp) but wasn’t prepaired to give up too much revs to achieve it and as we all know that’s impossible.
After much time spent researching I was all set to invest in an LM400 until the car was in for something else with my tuner and long story short he talked me out of it. For the expense it’d cost me it wasn’t worth the little gain it would give me, and I’d miss the early spool a standard turbo would give.
In the end I had my VF37 rebuilt and had a billet wheel with more blades added for good measure. This meant the turbo was more efficient and was able to make more boost easier. Once it was mapped (although not night and day) it made a difference. Plus the boost came in earlier and pulled for longer in the rev range too making it a far more drivable car. Remember the first time you had your car mapped (assuming yours has been) when you drove it for the first time afterwards how much smoother and just generally better it felt and all because of a simple remap? Well it was the same feeling again with the new turbo set up.
The more time that passed and the more people I talked to it seemed it was a good call. A fellow forum member I’ve dealt with has a LM450 and front mount on a very sorted car and he’s talking about changing his set up back to a VF36 and top mount. In his words a friend of his who he often drives with has a similar setup and as a point to point/corner to corner car his set up leaves the LM450 set up for dead. On a long straight yeah the LM450 has a big advantage but by the time his turbo has spooled up and he starts to real the other car in its too late, the other car has too big of a lead and the next corner is here already. All that power but he couldn’t use it.
As a daily driver around nice B roads it’s the less laggy turbo you want not big BHP and numbers so it depends on what YOU want. If you’re after big numbers then get a big turbo but as a daily driver on UK roads...
There are many far more intelligent people than me that can offer advice or their opinion on the what’s what of turbos, with various options and graphs to back it all up but above is what I did when I was looking for what you are now and I’m very happy with the way it turned out. I hope it’s of some help to you mate.
Binny
who did the work on your turbo? Seems like the route I will take as your spot on with what I want I’m not chasing figures just that response as you say
i also have good local access to a good mapper so that’s no probs
did you change the injectors?
Scooby Regular
Joined: Dec 2016
Posts: 137
Likes: 2
From: Rushden, Northants
Craig Bellworthy @ Central Turbos in Derby. He comes highly recommended by many and certainly knows his stuff.
My VF37 was on its way out and needed sorting. The LM400 was initially my goal but my tuner and others from researching all seemed to say the same thing so a trip to see Craig and problem sorted.
One of the main reasons for not choosing a bigger turbo was the need for bigger injectors. On top of the expense for a new turbo, plus fitting, mapping etc was the need for bigger injectors. Although they do come up on the second hand market every now and again they still add more expense to an already growing list of requirements. It was this convo with my tuner that put the nail in the coffin for me. He said I’d only gain another 15-20bhp from the LM400 plus injectors etc etc to what I have now but the difference in cost was substantially more and far too much in my eyes to justify 20bhp.
In my case the turbo rebuild/upgrade cost me just under £900 with a mapping session on top so all in around £1k. A new turbo is £1.5 to £2k then injectors and so on. Could be almost £3k by the time it’s done. A second hand turbo would be a more cost effective option but twinscroll versions don’t come up often and when they do they tend to be the larger ones chasing big power so that idea was out the window. When have you ever seen a LM400 come up for resale?
As much as I’m very happy with my outcome the only thing I’d do different is use a VF36 not VF37 for even quicker spool. I did try and source one instead of using my existing VF37 prior to the work but nothing was available and despite trying I came up empty. If I’d have had more time I’d have waited, got the VF36 and done the same billet upgrade but I’m not loosing sleep over it.
Binny
My VF37 was on its way out and needed sorting. The LM400 was initially my goal but my tuner and others from researching all seemed to say the same thing so a trip to see Craig and problem sorted.
One of the main reasons for not choosing a bigger turbo was the need for bigger injectors. On top of the expense for a new turbo, plus fitting, mapping etc was the need for bigger injectors. Although they do come up on the second hand market every now and again they still add more expense to an already growing list of requirements. It was this convo with my tuner that put the nail in the coffin for me. He said I’d only gain another 15-20bhp from the LM400 plus injectors etc etc to what I have now but the difference in cost was substantially more and far too much in my eyes to justify 20bhp.
In my case the turbo rebuild/upgrade cost me just under £900 with a mapping session on top so all in around £1k. A new turbo is £1.5 to £2k then injectors and so on. Could be almost £3k by the time it’s done. A second hand turbo would be a more cost effective option but twinscroll versions don’t come up often and when they do they tend to be the larger ones chasing big power so that idea was out the window. When have you ever seen a LM400 come up for resale?
As much as I’m very happy with my outcome the only thing I’d do different is use a VF36 not VF37 for even quicker spool. I did try and source one instead of using my existing VF37 prior to the work but nothing was available and despite trying I came up empty. If I’d have had more time I’d have waited, got the VF36 and done the same billet upgrade but I’m not loosing sleep over it.
Binny
On the road the lm450 is an epic turbo drop down a gear your on boost instantly
its laggier normal driving but it’s very simple to get that on boost
and the powerband is awesome to 8k
its laggier normal driving but it’s very simple to get that on boost
and the powerband is awesome to 8k
Thread Starter
Scooby Regular
Joined: Oct 2014
Posts: 6,082
Likes: 131
From: P1234x
Craig Bellworthy @ Central Turbos in Derby. He comes highly recommended by many and certainly knows his stuff.
My VF37 was on its way out and needed sorting. The LM400 was initially my goal but my tuner and others from researching all seemed to say the same thing so a trip to see Craig and problem sorted.
One of the main reasons for not choosing a bigger turbo was the need for bigger injectors. On top of the expense for a new turbo, plus fitting, mapping etc was the need for bigger injectors. Although they do come up on the second hand market every now and again they still add more expense to an already growing list of requirements. It was this convo with my tuner that put the nail in the coffin for me. He said I’d only gain another 15-20bhp from the LM400 plus injectors etc etc to what I have now but the difference in cost was substantially more and far too much in my eyes to justify 20bhp.
In my case the turbo rebuild/upgrade cost me just under £900 with a mapping session on top so all in around £1k. A new turbo is £1.5 to £2k then injectors and so on. Could be almost £3k by the time it’s done. A second hand turbo would be a more cost effective option but twinscroll versions don’t come up often and when they do they tend to be the larger ones chasing big power so that idea was out the window. When have you ever seen a LM400 come up for resale?
As much as I’m very happy with my outcome the only thing I’d do different is use a VF36 not VF37 for even quicker spool. I did try and source one instead of using my existing VF37 prior to the work but nothing was available and despite trying I came up empty. If I’d have had more time I’d have waited, got the VF36 and done the same billet upgrade but I’m not loosing sleep over it.
Binny
My VF37 was on its way out and needed sorting. The LM400 was initially my goal but my tuner and others from researching all seemed to say the same thing so a trip to see Craig and problem sorted.
One of the main reasons for not choosing a bigger turbo was the need for bigger injectors. On top of the expense for a new turbo, plus fitting, mapping etc was the need for bigger injectors. Although they do come up on the second hand market every now and again they still add more expense to an already growing list of requirements. It was this convo with my tuner that put the nail in the coffin for me. He said I’d only gain another 15-20bhp from the LM400 plus injectors etc etc to what I have now but the difference in cost was substantially more and far too much in my eyes to justify 20bhp.
In my case the turbo rebuild/upgrade cost me just under £900 with a mapping session on top so all in around £1k. A new turbo is £1.5 to £2k then injectors and so on. Could be almost £3k by the time it’s done. A second hand turbo would be a more cost effective option but twinscroll versions don’t come up often and when they do they tend to be the larger ones chasing big power so that idea was out the window. When have you ever seen a LM400 come up for resale?
As much as I’m very happy with my outcome the only thing I’d do different is use a VF36 not VF37 for even quicker spool. I did try and source one instead of using my existing VF37 prior to the work but nothing was available and despite trying I came up empty. If I’d have had more time I’d have waited, got the VF36 and done the same billet upgrade but I’m not loosing sleep over it.
Binny
so now I am going to source a vf36 and then get it sent off for the mods you’ve mentioned then swap it over and map it up happy days then I’ve got one spare if ever needed
will start praying to the Subaru gods alittle more next year so I can source a vf36 by or before March
superb info and advice binny thanks for the contact aswell I’ll be sending a vf36 to them soon as I’ve sourced one
so now I am going to source a vf36 and then get it sent off for the mods you’ve mentioned then swap it over and map it up happy days then I’ve got one spare if ever needed
will start praying to the Subaru gods alittle more next year so I can source a vf36 by or before March
https://www.ebay.co.uk/sch/i.html?_f...=vf36&_sacat=0
Thread Starter
Scooby Regular
Joined: Oct 2014
Posts: 6,082
Likes: 131
From: P1234x
i reckon im going to get lucky with a freshly imported low mileage spec c item tho lol!
Thread Starter
Scooby Regular
Joined: Oct 2014
Posts: 6,082
Likes: 131
From: P1234x
What you folks think bout this one?
https://rover.ebay.com/rover/0/0/0?m...2F162764566348
owens develeopments is on the list as a last result if vf36 not found by March just order a new unit then map time
https://rover.ebay.com/rover/0/0/0?m...2F162764566348
owens develeopments is on the list as a last result if vf36 not found by March just order a new unit then map time
Scooby Regular
Joined: May 2013
Posts: 350
Likes: 39
From: Scaberdeen
I've got an early LM400 on my car and it does perform really well, although I do have the itch for more power.
Im looking at having it rebuilt as it's due a refresh for the miles it's covered. Having said that, the price to rebuild the LM400 from Turbo Dynamics puts me in a position to have the turbo sent to Chevron / Owen Developments instead and have it upgraded to run about 450bhp on pump fuel, I assume it's more or less their S1 spec turbo it would be converted to albeit using the original TD exhaust housing. It's a no brainer considering how well received the Chevron / OD twinscroll turbos are, especially maintaining good spool characteristics.
I do recall Turbo Dynamics offering an MD366 upgrade a while back which when I enquired last year they said it was possible after some discussion. Its essentially a modded VF36 which would be close to producing 380/390bhp iirc.
A good person to ask is Wuz (Russell) on here. He's got plenty experience using a few different variants of twinscroll turbos fitted to his cars over the years.
Im looking at having it rebuilt as it's due a refresh for the miles it's covered. Having said that, the price to rebuild the LM400 from Turbo Dynamics puts me in a position to have the turbo sent to Chevron / Owen Developments instead and have it upgraded to run about 450bhp on pump fuel, I assume it's more or less their S1 spec turbo it would be converted to albeit using the original TD exhaust housing. It's a no brainer considering how well received the Chevron / OD twinscroll turbos are, especially maintaining good spool characteristics.
I do recall Turbo Dynamics offering an MD366 upgrade a while back which when I enquired last year they said it was possible after some discussion. Its essentially a modded VF36 which would be close to producing 380/390bhp iirc.
A good person to ask is Wuz (Russell) on here. He's got plenty experience using a few different variants of twinscroll turbos fitted to his cars over the years.
Thread Starter
Scooby Regular
Joined: Oct 2014
Posts: 6,082
Likes: 131
From: P1234x
I've got an early LM400 on my car and it does perform really well, although I do have the itch for more power.
Im looking at having it rebuilt as it's due a refresh for the miles it's covered. Having said that, the price to rebuild the LM400 from Turbo Dynamics puts me in a position to have the turbo sent to Chevron / Owen Developments instead and have it upgraded to run about 450bhp on pump fuel, I assume it's more or less their S1 spec turbo it would be converted to albeit using the original TD exhaust housing. It's a no brainer considering how well received the Chevron / OD twinscroll turbos are, especially maintaining good spool characteristics.
I do recall Turbo Dynamics offering an MD366 upgrade a while back which when I enquired last year they said it was possible after some discussion. Its essentially a modded VF36 which would be close to producing 380/390bhp iirc.
A good person to ask is Wuz (Russell) on here. He's got plenty experience using a few different variants of twinscroll turbos fitted to his cars over the years.
Im looking at having it rebuilt as it's due a refresh for the miles it's covered. Having said that, the price to rebuild the LM400 from Turbo Dynamics puts me in a position to have the turbo sent to Chevron / Owen Developments instead and have it upgraded to run about 450bhp on pump fuel, I assume it's more or less their S1 spec turbo it would be converted to albeit using the original TD exhaust housing. It's a no brainer considering how well received the Chevron / OD twinscroll turbos are, especially maintaining good spool characteristics.
I do recall Turbo Dynamics offering an MD366 upgrade a while back which when I enquired last year they said it was possible after some discussion. Its essentially a modded VF36 which would be close to producing 380/390bhp iirc.
A good person to ask is Wuz (Russell) on here. He's got plenty experience using a few different variants of twinscroll turbos fitted to his cars over the years.
yes vf36 with upgrades is now the final choice just finding one to do up
did you change your injectors or the stock ones?
as I’m not at after figures just the set off and mid range power to be more animal
i’m ringing Owen developments up next week for some more info on exactly what they offer aswell
Scooby Regular
Joined: May 2013
Posts: 350
Likes: 39
From: Scaberdeen
thankyou for your input much appreciated
yes vf36 with upgrades is now the final choice just finding one to do up
did you change your injectors or the stock ones?
as I’m not at after figures just the set off and mid range power to be more animal
i’m ringing Owen developments up next week for some more info on exactly what they offer aswell
I've already got 850cc injectors but your standard 550cc injectors coupled to an FPR upped to 3.5bar will probably give you more than enough headroom for around 400bhp
Thread Starter
Scooby Regular
Joined: Oct 2014
Posts: 6,082
Likes: 131
From: P1234x
more for reliability than the power in my case
Also i do like overkill and 400 bhp would be superb although I’ll be happy round the 380ish but lot more grunt on take off and mid range is my goal
Thread Starter
Scooby Regular
Joined: Oct 2014
Posts: 6,082
Likes: 131
From: P1234x
I reckon £3.5k should do it nicely bro
gonna have some enjoyable summers round the buttertubs next year but want this out of the way for May time latest all the bits installed and then mapped by my local reachable and very knowledgeable friendly mapper
Then I might just be able to keep pace with my mates Yamaha r1m NOT!
gonna have some enjoyable summers round the buttertubs next year but want this out of the way for May time latest all the bits installed and then mapped by my local reachable and very knowledgeable friendly mapper
Then I might just be able to keep pace with my mates Yamaha r1m NOT!
Thread Starter
Scooby Regular
Joined: Oct 2014
Posts: 6,082
Likes: 131
From: P1234x
i’d hate to lose the quick spool up to be honest and that’s why I’m opting for the vf36 with upgrades or whichever one I get advised for my needs
lookin* about so far Owens developments is favourite on the list no messing this way
Thread
Thread Starter
Forum
Replies
Last Post
Mattybr5@MB Developments
Full Cars Breaking For Spares
9
Apr 11, 2018 02:31 PM
Mattybr5@MB Developments
Full Cars Breaking For Spares
23
Jul 17, 2017 07:29 AM