VF35 Spool vs MD321H
#1
VF35 Spool vs MD321H
Hi,
Does anyone know which of these two units will spool faster, given the same application, i.e. were the VF35 to be swapped out in my STI8 PPP for the MD321H (Assuming optimal remapping in each case)?
Does anyone know which of these two units will spool faster, given the same application, i.e. were the VF35 to be swapped out in my STI8 PPP for the MD321H (Assuming optimal remapping in each case)?
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I made 412bhp on the 380 turbo they do with a little meth
Last edited by Going 4 400bhp; 28 September 2009 at 10:51 PM.
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I doubt you'll find a quicker spooling turbo than the VF35 (apart from the TD04 from the WRXs) but the VF35 is a 340bhp turbo and the MD321H is a 400bhp turbo so the latter will involve some compromise with spool. I do recall one graph on here where the MD was as good in terms spool characteristics as a VF28 (another low-mid 300s turbo), which is deeply impressive! Cracking turbo by all accounts.
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Harvey has a new up-pipe for the MD321H which is supposed to help even more.... mine is a touch slow getting going, but then all hell breaks loose and it's 2 bar and beyond. (ecu limited to 1.65 bar & 392 bhp actually !)
I changed the whole exhaust system and de-catted too, so can't compare like with like, sorry.
dunx
I changed the whole exhaust system and de-catted too, so can't compare like with like, sorry.
dunx
#6
That makes for interesting reading!
So basically I appear to be spoiled with my VF35. I'd like to have the car make 400bhp but still improve on the low end throttle response. I know 400hp is beyond the VF35 and my ideal would have been a 400bhp unit with faster spool characteristics than the VF35 but it sounds like this isn't going to be possible.
OK $64k question:
My car already has ported headers, modified induction and a slightly optimised PPP map. If I do the following would anyone hazard a guess as to whether a MD321H will be able to spool faster than my Stock STI PPP VF35 setup:
Lightened crank 'and other' pulley set from CDF Racing
Get the MD321H ported (if it isn't already)
Ultimate Racing low impedance 785cc injectors (with circuit for high imped. conversion)
If I can best the car's current spool-up and hit 400hp on pump fuel (without going so far as stroking) I'd be VERY happy. Do we think this is possible I am I just being
So basically I appear to be spoiled with my VF35. I'd like to have the car make 400bhp but still improve on the low end throttle response. I know 400hp is beyond the VF35 and my ideal would have been a 400bhp unit with faster spool characteristics than the VF35 but it sounds like this isn't going to be possible.
OK $64k question:
My car already has ported headers, modified induction and a slightly optimised PPP map. If I do the following would anyone hazard a guess as to whether a MD321H will be able to spool faster than my Stock STI PPP VF35 setup:
Lightened crank 'and other' pulley set from CDF Racing
Get the MD321H ported (if it isn't already)
Ultimate Racing low impedance 785cc injectors (with circuit for high imped. conversion)
If I can best the car's current spool-up and hit 400hp on pump fuel (without going so far as stroking) I'd be VERY happy. Do we think this is possible I am I just being
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You can't expect a 20% bigger turbo to spool like the smaller one.
LOL, you need NO2....
dunx
LOL, you need NO2....
dunx
Last edited by dunx; 29 September 2009 at 10:51 AM.
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#8
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I fitted this up-pipe last month and these are my thoughts as emailed to Harvey:
Spool - slightly better (earlier). On a sequence of uphill bends near home, I was able to accelerate out of some of them using one gear higher;
Throttle response - definitely better - much better!. Going through the gears, even less response time for car to 'go' after every gear change - virtually instantaneous in fact;
Torque - more mid range thump;
Top end power. Doesn't seem quite as eager but I think that's because of the rise in mid range torque making top end torque seem less; Paul at Zen agrees and the power graph verifies this.
Hope this helps
To the OP, an MD321H with Harvey's up-pipe on GT Spec headers spools pretty much as quick as a VF35 on standard headers and is a massive step up in performance
Last edited by lunar tick; 29 September 2009 at 01:09 PM.
#9
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That makes for interesting reading!
So basically I appear to be spoiled with my VF35. I'd like to have the car make 400bhp but still improve on the low end throttle response. I know 400hp is beyond the VF35 and my ideal would have been a 400bhp unit with faster spool characteristics than the VF35 but it sounds like this isn't going to be possible.
OK $64k question:
My car already has ported headers, modified induction and a slightly optimised PPP map. If I do the following would anyone hazard a guess as to whether a MD321H will be able to spool faster than my Stock STI PPP VF35 setup:
Lightened crank 'and other' pulley set from CDF Racing
Ultimate Racing low impedance 785cc injectors (with circuit for high imped. conversion)
If I can best the car's current spool-up and hit 400hp on pump fuel (without going so far as stroking) I'd be VERY happy. Do we think this is possible I am I just being
So basically I appear to be spoiled with my VF35. I'd like to have the car make 400bhp but still improve on the low end throttle response. I know 400hp is beyond the VF35 and my ideal would have been a 400bhp unit with faster spool characteristics than the VF35 but it sounds like this isn't going to be possible.
OK $64k question:
My car already has ported headers, modified induction and a slightly optimised PPP map. If I do the following would anyone hazard a guess as to whether a MD321H will be able to spool faster than my Stock STI PPP VF35 setup:
Lightened crank 'and other' pulley set from CDF Racing
Ultimate Racing low impedance 785cc injectors (with circuit for high imped. conversion)
If I can best the car's current spool-up and hit 400hp on pump fuel (without going so far as stroking) I'd be VERY happy. Do we think this is possible I am I just being
The MD will always spool slower, not quicker, whatever you do but the difference would be small
#10
Buy a MD321T its the same price as the H. No problems with spool on a 2l and you will soar past 400 without the need to add more mods if you dont hit your target bhp.
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Sorry was a bit slack, obviously.... it's a header related up-grade rather than a turbo specific part, "my bad"
So you rate it then
dunx
P.S. I wonder if he has one in stock....
So you rate it then
dunx
P.S. I wonder if he has one in stock....
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Didn't I see your car in a well known (locally) Elvington establishment ?
I need help as mine isn't fully well, but I need a 2.1 stroker for xmas
dunx
I need help as mine isn't fully well, but I need a 2.1 stroker for xmas
dunx
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another vote for a harvey up-pipe with the gt spec headers.
made a massive difference to my sc46 turbo i run on my car.
i run non vvt heads (sti v4) my spool up in 1/2/3rd gears in better by around 200rpm ish in 4/5/6th is around 500rpm sooner.
mid range punch is massively different pulls mouch more strongly.
makes drivability very different with no difference in boost. i run 1.8 bar on one map and
my car will hold 1.8 bar in every gear till the red line (obviously i've never red lined 6th gear but holds to 1.8 bar every time i use 6th).
i know the subject was about turbo's but if you use one of harvey's pipes with any turbo you are going to see a massive difference.
made a massive difference to my sc46 turbo i run on my car.
i run non vvt heads (sti v4) my spool up in 1/2/3rd gears in better by around 200rpm ish in 4/5/6th is around 500rpm sooner.
mid range punch is massively different pulls mouch more strongly.
makes drivability very different with no difference in boost. i run 1.8 bar on one map and
my car will hold 1.8 bar in every gear till the red line (obviously i've never red lined 6th gear but holds to 1.8 bar every time i use 6th).
i know the subject was about turbo's but if you use one of harvey's pipes with any turbo you are going to see a massive difference.
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And even if you did have VVT heads the H would still make a better drivers car on a 2.0 (It's not all about bhp boys)
#22
Just you stick to your diy reconditioned turbos and when you manage to make it last more than 5miles then come back.
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390 actually on a sick car as you well know. I have a boost plot on another MD thread here Dazza, take a gander @ it and tell me if it's laggy! I also have a Delta dash for 445bhp @ the time of mapping. You brag about your Delta dash figures so you can hardly question mine.
Just you stick to your diy reconditioned turbos and when you manage to make it last more than 5miles then come back.
Just you stick to your diy reconditioned turbos and when you manage to make it last more than 5miles then come back.
And i will keep going with my turbo project thanks........
.........only sayin what every-1 else is sayin........please no more insulting private pm`s thanks.
I was not convinced of the MD`s performance figure`s on a stock 2.0 sti m8 but if u want 2 make it personal that`s up 2 u.
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I had ported headers when I first fitted the MD321H and I think the spool was very similar to a VF35 with non-ported headers. I struggled to make 400bhp with the ported headers though, so fitted GT Spec II and hit 402bhp.
I've got one of Harvey's GT Spec up-pipes waiting to go on, so I'll post my thoughts when it's on. Won't be a completly fair test though as also fitting Lateral turbo silicon hose and CDF light weight pulleys.
Anders
I've got one of Harvey's GT Spec up-pipes waiting to go on, so I'll post my thoughts when it's on. Won't be a completly fair test though as also fitting Lateral turbo silicon hose and CDF light weight pulleys.
Anders
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OK $64k question:
My car already has ported headers, modified induction and a slightly optimised PPP map. If I do the following would anyone hazard a guess as to whether a MD321H will be able to spool faster than my Stock STI PPP VF35 setup:
Lightened crank 'and other' pulley set from CDF Racing
Get the MD321H ported (if it isn't already)
Ultimate Racing low impedance 785cc injectors (with circuit for high imped. conversion)
My car already has ported headers, modified induction and a slightly optimised PPP map. If I do the following would anyone hazard a guess as to whether a MD321H will be able to spool faster than my Stock STI PPP VF35 setup:
Lightened crank 'and other' pulley set from CDF Racing
Get the MD321H ported (if it isn't already)
Ultimate Racing low impedance 785cc injectors (with circuit for high imped. conversion)
#28
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I had ported headers when I first fitted the MD321H and I think the spool was very similar to a VF35 with non-ported headers. I struggled to make 400bhp with the ported headers though, so fitted GT Spec II and hit 402bhp.
I've got one of Harvey's GT Spec up-pipes waiting to go on, so I'll post my thoughts when it's on. Won't be a completly fair test though as also fitting Lateral turbo silicon hose and CDF light weight pulleys.
Anders
I've got one of Harvey's GT Spec up-pipes waiting to go on, so I'll post my thoughts when it's on. Won't be a completly fair test though as also fitting Lateral turbo silicon hose and CDF light weight pulleys.
Anders
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321T will run more power up top, but won't spool as well, so arguably not quite as useable on the road. All depends how you like to use the gearbox of course