More power for V7 STI

[Guest]

just get one of those real thick top mounts (aftermarket of course)

[Guest]

 funkytown']

[quote name='ballsrburning said:

personally I would not put a front mount on, this won't gain any power, if anything it will probably lose power.

I did this mod and lost 4 kw atw from 210-206 on my 2000 type ra sti. The lag from the piping is bloody annoying too. Capper tuned the car beofre and after so it was done by someone who knows what they are doing.

/quote]

so it was on two different dynos? if so your 4kw figure and relating it to FMIC's is null and void.

No, same dyno, same day, same person doing it. The difference in lag is very noticable too. All i know is i can tell the diffrence when i use it on the track.

I only left it on becuase i like the look. I have plumbed the topmount back up (well v7 one) and just having the fmic for show until i go down the twisted turbo and flipped manifold route, then i will reinstate the fmic.For now thoiugh I am more interested in the handling of the car so spending money on that.

[ROYALS STI]

I think I like Sultans idea of putting gas in it and driving the car for a while.I don't really have much money at the moment and I'll probably get rid of the v7 and hopefully upgrade at some stage(if my wife lets me lol) to a v8 or v9 with lower kms.

[lunchie]

 ROYALS STI said:

I think I like Sultans idea of putting gas in it and driving the car for a while.I don't really have much money at the moment and I'll probably get rid of the v7 and hopefully upgrade at some stage(if my wife lets me) to a v8 or v9 with lower kms.

well then I wouldnt touch it, you NEVER get back money spent when u sell it.

[Scoobydoo]

Yeah pretty much. Only spend money on it if you want to put it into a sinkhole. And if your wife tells you what to do, then you shouldn't be doing it if you're openly saying you don't have much money now as it is.

[sultan]

i can't see how it's possible on a tuned setup to lose power from a front mount. the surface area of the cooler is much bigger. better cooling ability, cooler intake temperatures, therefore you can push more timing advance without detonation. which means more power

[johnny5]

im with you bro throttle response is most likely but power just sounds weird not gonna say its false cause i was not there

[sultan]

yeah, also with capper, i gained 30kw from switching to front mount (because of being able to put in more boost and timing). but mine was the shittest of shit non-sti v1

before and after tune on a v7, if front mount was the only change, yeah i don't think it would gain much, as the top mount wouldn't have been the limiting factor

[Guest]

 sultan said:

yeah, also with capper, i gained 30kw from switching to front mount (because of being able to put in more boost and timing). but mine was the s***test of s*** non-sti v1

before and after tune on a v7, if front mount was the only change, yeah i don't think it would gain much, as the top mount wouldn't have been the limiting factor

No suprise upping the boost would increase your power.

As I may have said before the car was running 20 psi on topmount (link g4 ecu, 3 inch exhaust system , downpipe, decated, upgraded fuel pump, heat wrapped pipes)and the only chage was purley topmount to front mount conversion and it lost power.

The guy thats doing all the work on my car now, is constantly telling me to stick to top mount, (ex winger subaru mechanic now indepenant subaru specialist who also looks after a number of race cars) he knows his stuff. The v7 topmount on the gc8 works a treat, inifintley better than the fmic I had on there and this is very evident at the track days I do. If you want a performance gain I would spend the money else where.

[sultan]

obviously upping the boost increases the power. the only reason that could be done was because of switching to the front mount. without it, intake temps were too high and it would detonate. which is exactly the point of using a fmic. the cooler itself doesn't make negligble difference until the lower intake temps are taken advantage of through tuning, with more boost, leaner mixture, and more advanced timing.

in your setup, the reason you didn't have any gains, is because your v7 top mount is still well within its efficiency range at that relativly low level of power of around 200kw you said. thinking about it, it's no surprise really, that adding in all the piping, and elbows, and bends, would have an adverse effect on power without changing the tuning. slap on a bigger turbo than your vf28/29 i assume, and see what happens then.

[Guest]

 sultan said:

obviously upping the boost increases the power. the only reason that could be done was because of switching to the front mount. without it, intake temps were too high and it would detonate. which is exactly the point of using a fmic. the cooler itself doesn't make negligble difference until the lower intake temps are taken advantage of through tuning, with more boost, leaner mixture, and more advanced timing.

in your setup, the reason you didn't have any gains, is because your v7 top mount is still well within its efficiency range at that relativly low level of power of around 200kw you said. thinking about it, it's no surprise really, that adding in all the piping, and elbows, and bends, would have an adverse effect on power without changing the tuning. slap on a bigger turbo than your vf28/29 i assume, and see what happens then.

I will go back to the fmic when i do the twisted turbo set up and change the turbo as you are correct the car runs the oem turbo. Mechanic has said running higher power I will need to go back to the fmic but for now I dont. The point is the OP has not got anything else done to the car so putting a fmic on will not increadse power for him either. Which is the point I was trying to make.

[Guest]

 nt_a_foz']

[quote name='ballsrburning said:

personally I would not put a front mount on, this won't gain any power, if anything it will probably lose power.

I did this mod and lost 4 kw atw from 210-206 on my 2000 type ra sti. The lag from the piping is bloody annoying too. Capper tuned the car beofre and after so it was done by someone who knows what they are doing.

/quote]

Disagree.....

I didnt notice f all lag on mine..

Talk to any tuner of race cars or the like and theyl say start pushing ab it more factory power through and/or using on the track fmic is that way to go.

also disagree...

ive been to probably over 10 dyno days... even have the same car with the same mods apart from top mount and front mount... 10-20kw different, this also have proven on two dyno run on my mates cars.. we did one dyno run and the next dyno run we got more power

my car previous with ver4 ej20 (non sti engine) with vf22 got over 200kw with just front mounts..

just taken out my temporary top mount and replaced with my front mounts and i can feel the different... having a AVCS heads.... whats lag??? boost and everything else kicks in at 4000rpm and i got another 4000rpm til it hits redline

ive heard that some car do get a large amount power also... but seriously... i dont see much race cars with top mount... last time i saw a STI WRC car it has a V mounted front mount... most of the race cars are tunes car anyway which will illuminate most lags.. upping the boost will give you more power... but Arron from shred disagree with this on the last dyno day we had... he explains that boost doesnt alway give you power

take into an account to get a good power you need a good engine also not some 250,000km+ engine

[Pappu1]

not true abt fmic..

have seen v7 sti with fmic vs tmic

after retune the ones with tmic ones usually end up 220kwish

have seen fmic ones retuned to over 230kwish

hence yes - fmic will give u more go (as explained by sultan abt the colder intake temp etc) once tuned

anyway, comes down to budget - what do u wana spend?

as i have said before - get ur car dynoed and see what u doing before doing more as e.g. u may be running too lean already or may see more power scope within current setup assuming say ur injectors are still under 90% or there could be some other combination of things....

im just saying that without knowing what u have there is not much need to spend (since on tight budget) as never know u may find more from the current setup eh

also abt lag - my brother just got a v7sti with fmic and mine is tmic

have driven both back to back and cant really tell difference too much with lag between the 2

both seem to kick abt the same time

[Guest]

 pappu said:

not true abt fmic..

have seen v7 sti with fmic vs tmic

after retune the ones with tmic ones usually end up 220kwish

have seen fmic ones retuned to over 230kwish

hence yes - fmic will give u more go (as explained by sultan abt the colder intake temp etc) once tuned

anyway, comes down to budget - what do u wana spend?

as i have said before - get ur car dynoed and see what u doing before doing more as e.g. u may be running too lean already or may see more power scope within current setup assuming say ur injectors are still under 90% or there could be some other combination of things....

im just saying that without knowing what u have there is not much need to spend (since on tight budget) as never know u may find more from the current setup eh

also abt lag - my brother just got a v7sti with fmic and mine is tmic

have driven both back to back and cant really tell difference too much with lag between the 2

both seem to kick abt the same time

+1 agree with you on that

you dont noticed the lags because of the AVCS heads when it kicks in at 4000rpm... but u will noticed the response difference but no by much when u take the car to Piha on a midnight run

AVCS ftw man.. imagine Greg's V7 STI spec C with 2.5 AVCS garret GT35... now this guy spending his money in the right place

[pl0x]

This "lag" that front mounts add is bullocks

[funkytown]

 pl0x said:

This "lag" that front mounts add is bullocks

do the maths right agree its bollocks.

[Guest]

depeneds on your setup to be honest.my mates old wrx wagon non sti runinng a vf22 and front mount.and it was supper laggy on just 10psi.

[Guest]

10psi isnt lag! is called limp mode! he should be boosting atleast 15psi. why is it boosting 10psi is has to be something wrong it? was he driving on 5th gear at 20km/h?

VF22 works well over 15psi

[Pappu1]

 xecuta said:

10psi isnt lag! is called limp mode! he should be boosting atleast 15psi. why is it boosting 10psi is has to be something wrong it? was he driving on 5th gear at 20km/h?

VF22 works well over 15psi

u on a roll today bro!!!

[Guest]

limp mode?na na na wasnt that,it was set on a boost tap when he first bought it.(10psi) drove it around for awhile.then realised the engine could take a lil more so we increased it to 12 then 15,the vf22 wasnt a good turbo on that car.it was a non sti aswell.

[Pappu1]

hmm how come was not good on that car bro?

at 15-16 psi the vf22 makes most cars come very alive

have seen it fitted to a few non sti wagons especially the most recent one was a 1997 v4 wagon with td04 and after vf22 the thing went rather well on 15psi

[Guest]

not sure really.it was okay,but laggy.turbo would start spooling up til around 4100 if i remeber right

[funkytown]

that and you find something like a vf22 isnt going to be efficient at 10psi, it will feel dull and laggy. mine (nt a 22 but still applies) feels linear and dull on low boost (about 12psi) even though its 200wkw its really linear. when on high boost it ramps alot faster and hits you alot more from 5-12psi and then continues on to around 20

[Guest]

like funktown said.it was very powerfull on 10psi.once it was on 15 psi it was okay.motorway pulls it was good too.but from traffic light it was useless on 10psi.even my car when i run internal gate pressure.(9psi)it feels so slow comparing it to when its boosting 16ish.

[funkytown]

thats nothing to do with FMIC's though to be clear, i'm talking low turbo pressure and efficiency range.