blob gearbox limits
12 April 2014, 03:41 PM
#1
Scooby Regular
Thread Starter
Join Date: Mar 2010
Location: north wales
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
blob gearbox limits
Hi,
I have just got back into a scoob after a couple of years in a vectra gsi, i have had a few classic impreza’s in the past, but everyone i have had due to the upgrades on them before purchase or mods i have done the gearbox has gone on every classic i have owned.
i have now decided to forget the classic (shame as i love the shape of them) and have gone for a 2003 impreza wrx ppp wagon in mint condition with full history.
My question is what bhp can the standard box on these be rated too before they go the same way of my previous classic’s, just i don’t want to give it to many horses if the gearbox can’t handle them so looking for a safe number to go to without having to spend stupid money on the 6 speed box, i would rather keep the box standard and mod the car to the upper limits of the gearbox.
I’m not sure what bhp difference the ppp extras give but looking at some technical info the standard wrx wagon is running 225bhp,
The car currently has no engine mods and is totally standard apart from the factory fit ppp kit, an sti scoop and sti alloys, I’m looking at putting an sti TMIC on it but apart from this i have no idea what number i m looking for to safely run the box without killing it.
Cheers Steve.
I have just got back into a scoob after a couple of years in a vectra gsi, i have had a few classic impreza’s in the past, but everyone i have had due to the upgrades on them before purchase or mods i have done the gearbox has gone on every classic i have owned.
i have now decided to forget the classic (shame as i love the shape of them) and have gone for a 2003 impreza wrx ppp wagon in mint condition with full history.
My question is what bhp can the standard box on these be rated too before they go the same way of my previous classic’s, just i don’t want to give it to many horses if the gearbox can’t handle them so looking for a safe number to go to without having to spend stupid money on the 6 speed box, i would rather keep the box standard and mod the car to the upper limits of the gearbox.
I’m not sure what bhp difference the ppp extras give but looking at some technical info the standard wrx wagon is running 225bhp,
The car currently has no engine mods and is totally standard apart from the factory fit ppp kit, an sti scoop and sti alloys, I’m looking at putting an sti TMIC on it but apart from this i have no idea what number i m looking for to safely run the box without killing it.
Cheers Steve.
i thought it would be much lower, any suggestions how to achieve this.
12 April 2014, 04:18 PM
#4
Scooby Regular
Join Date: Jun 2013
Location: N/A
Posts: 617
Likes: 0
Received 0 Likes
on
0 Posts
350 is usually the max you could run the blob gearbox on. For piece of mind I would only mod your car to about 320-330 which is still tons of power and will not stress the engine and gearbox as much. Also how many miles has your car as if it is quite a lot then you may want to stick to 300-310 if you don't want to spend ££££'s on a rebuild and 6 speed. To get there you will need:
Bigger turbo and injectors: VF35, VF34 are pretty good or a SC36 if you don't want to go down the second hand route. 550cc injectors or STi pinks would be suitable.
Exhaust: Either a sports cat or de-cat (3") as the standard application is restrictive.
Panel Filter: K&N, etc. No need for an induction kit.
Upgraded fuel pump: Such as a Walbro 255lph, Scooby Worxs, RCM, etc.
Remap: You can get the original ECU mapped AFAIK without spending lots on a Simtek, etc.
Intercooler: STi intercooler would be the best option IMO although you can get a FMIC it would be a bit pointless at the low 300's.
Hope this helps,
Subaru Collector 555.
Bigger turbo and injectors: VF35, VF34 are pretty good or a SC36 if you don't want to go down the second hand route. 550cc injectors or STi pinks would be suitable.
Exhaust: Either a sports cat or de-cat (3") as the standard application is restrictive.
Panel Filter: K&N, etc. No need for an induction kit.
Upgraded fuel pump: Such as a Walbro 255lph, Scooby Worxs, RCM, etc.
Remap: You can get the original ECU mapped AFAIK without spending lots on a Simtek, etc.
Intercooler: STi intercooler would be the best option IMO although you can get a FMIC it would be a bit pointless at the low 300's.
Hope this helps,
Subaru Collector 555.
Last edited by User 21721; 12 April 2014 at 04:22 PM.
12 April 2014, 04:33 PM
#6
Scooby Regular
Thread Starter
Join Date: Mar 2010
Location: north wales
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
350 is usually the max you could run the blob gearbox on. For piece of mind I would only mod your car to about 320-330 which is still tons of power and will not stress the engine and gearbox as much. Also how many miles has your car as if it is quite a lot then you may want to stick to 300-310 if you don't want to spend ££££'s on a rebuild and 6 speed. To get there you will need:
Bigger turbo and injectors: VF35, VF34 are pretty good or a SC36 if you don't want to go down the second hand route. 550cc injectors or STi pinks would be suitable.
Exhaust: Either a sports cat or de-cat (3") as the standard application is restrictive.
Panel Filter: K&N, etc. No need for an induction kit.
Upgraded fuel pump: Such as a Walbro 255lph, Scooby Worxs, RCM, etc.
Remap: You can get the original ECU mapped AFAIK without spending lots on a Simtek, etc.
Intercooler: STi intercooler would be the best option IMO although you can get a FMIC it would be a bit pointless at the low 300's.
Hope this helps,
Subaru Collector 555.
Bigger turbo and injectors: VF35, VF34 are pretty good or a SC36 if you don't want to go down the second hand route. 550cc injectors or STi pinks would be suitable.
Exhaust: Either a sports cat or de-cat (3") as the standard application is restrictive.
Panel Filter: K&N, etc. No need for an induction kit.
Upgraded fuel pump: Such as a Walbro 255lph, Scooby Worxs, RCM, etc.
Remap: You can get the original ECU mapped AFAIK without spending lots on a Simtek, etc.
Intercooler: STi intercooler would be the best option IMO although you can get a FMIC it would be a bit pointless at the low 300's.
Hope this helps,
Subaru Collector 555.
the car has 90k so will take your advise and keep it to around the 300 mark,
is the prodrive ecu good to remap to that power or is it worth changing it, but the other parts look good to start adding, looking at an sti tmic on fleabay at the moment so a good place to start.
cheers again.
12 April 2014, 04:35 PM
#7
Scooby Regular
iTrader: (2)
Join Date: Apr 2004
Location: Somewhere in Kent, sniffing some V-Power
Posts: 15,029
Likes: 0
Received 0 Likes
on
0 Posts
No offence pal but if you have broken every gearbox on every impreza you have owned, there is one common denominator there.......the driver!
If you up the power to the limits of the gearbox, you will have to drive with a lot of mechanical sympathy to avoid damaging it.
I am on my 4th impreza, all ran between 260 and 320bhp and not broken a box yet. No hard launches, no sillly speed shifts and serviced them regularly.
They can last as long you drive them properly.
If you up the power to the limits of the gearbox, you will have to drive with a lot of mechanical sympathy to avoid damaging it.
I am on my 4th impreza, all ran between 260 and 320bhp and not broken a box yet. No hard launches, no sillly speed shifts and serviced them regularly.
They can last as long you drive them properly.
Trending Topics
12 April 2014, 04:39 PM
#8
Scooby Regular
Thread Starter
Join Date: Mar 2010
Location: north wales
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
yes mate,
my previous gearbox history isn't to good which is why i thought i would get some advise first this time
im a old fool who thinks ive still got the boyracer blood in me and i get the young kids in the corsa's/clio's trying to give it a little and my head just go's into idiot mode
12 April 2014, 04:44 PM
#9
Scooby Regular
Thread Starter
Join Date: Mar 2010
Location: north wales
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
No offence pal but if you have broken every gearbox on every impreza you have owned, there is one common denominator there.......the driver!
If you up the power to the limits of the gearbox, you will have to drive with a lot of mechanical sympathy to avoid damaging it.
I am on my 4th impreza, all ran between 260 and 320bhp and not broken a box yet. No hard launches, no sillly speed shifts and serviced them regularly.
They can last as long you drive them properly.
If you up the power to the limits of the gearbox, you will have to drive with a lot of mechanical sympathy to avoid damaging it.
I am on my 4th impreza, all ran between 260 and 320bhp and not broken a box yet. No hard launches, no sillly speed shifts and serviced them regularly.
They can last as long you drive them properly.
no offense taken mate because your right it is me, just got to learn not to bite when ive got some little sh1t3 right up my chuff.
12 April 2014, 04:59 PM
#13
Scooby Regular
Thread Starter
Join Date: Mar 2010
Location: north wales
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
Thread
Thread Starter
Forum
Replies
Last Post