I have a 53 plate sti ppp, was just curious to see how much work and money is involved to get to round 400 bhp or late 300's? Is it just a case of bigger turbo, fmic, bigger injectors and a remapp? Any advice welcome thanks

 

I would say turbo, maybe injectors and a remap as long as you have 3" bore exhaust. Might be worth considering some of Harvey headers too.

Banny

 

Fuelpump,
Fuel pressure regulator would be worth it as well,
3" exhaust,
Possible front mount,
Injectors,
Turbo,
Upgrade plugs,
Remap.

Might not last long though. Would personally fully forge the bottom end if I was going for 400bhp upwards. You know you'll always want more.

 

Thanks lads don't fancy a forge rebuild tho sound a lot of money and time off the road! Doesn't mine come with a walbo fuel pump? Iv heard it does What am I looking to do for around 360 to 380 bhp then?

 

The engine should be ok up to around 450bhp, as people have run them up to that with no issues. I would change the fuel pump as precaution considering the cost vs risk factor. Intercooler is fine up to 400bhp, you could squeeze 400bhp from the injectors if u fitted the fpr and upped the fuel pressure a bit.

Banny

 

Fulll 3 inch decat, air filter and remap will give you around 360. 380 will need new turbo, probably injectors and remap.

 

Cheers for the advice Banny some silly questions now sorry. What turbo should I be looking at, what's a pfr, and what sort of money am I looking at with parts? I know remapps are about £550 so just getting an idea!

 

fpr: Fuel Pressure Regulator

Turbo? Take advice from RESPECTED tuners on here, or ring round.

Expect to pay £850-£1500 for a turbo, £450 for injectors, £150 for a fuel pressure reg.

For the money I'd also invest in a charge air temperature gauge, esp if using a TMIC

Better to take your foot off when you see high temperatures than after it goes bang.........like what I did

 

See my spec, it nearly accurate. I got around 432bhp.

 

I am currently running 451bhp / 405ftlb on a 2004 Sti on standard internals with no issues in the last 2 1/2 years.

Give Martyn a ring at Alan Jeffery - Engine Tuner high performance engine tuning and engine building as they have got a few customers running about at this level with no issues.

 

Not necessarily

 

The engines are very strong! No need to go forged

 

20G or md321h you might need to run meth with the 20G

 

thanks for all the advice people
now to start saving a few pennies and look into how far i want to go with it really? i know alot of you say once you start modding you always want more power mine is an everyday drive so will think long and hard about this big step up

thanks again everyone for your knowledge and info Darren

 

I guess that's in response to my comment about going fully forged.

If you read what I said properly I actually said I would personally go fully forged because once you start modding you'll always want more.

 

These engines are forged, should you not be saying aftermarket forged.

 

IIRC they've only got forged pistons. Rods and crank aren't. If they were fully forged why would tuners develop forged parts to upgrade the sti engines?

 

Have the newage sti's got forged pistons then??

 

is it possible to make 360-370 on 98 octane without running octane booster with some of the afformentioned mods?

I'd like more in my 05 sti uk type.

Has anyone gone to a twinscroll turbo and exhaust setup when doing this?
I'd love to be able to get it to come on boost sooner, and produce a bit more torque lower in the rev range, without going the 2.5 route.

 

I mapped one a few weeks ago that made 364.9bhp on the std VF35 turbo on vpower alone. It is possible.

 

Is that ATW or a typo?

 

typo most definitely

 

lol

 

That would have been impressive -0.1bhp from a remap

 

What other mods were on it?
What rpm and number was max torque?

Sounds impressive eitherway. I'd be happy if i could make 350 without replacing turbo.

 

Full decat, cold air Induction kit and map. Haven't got the dyno charts with me but seem to remember that torque was a little down on what was expected but it was making good boost around 3k ish.

 

Ok thanks.

Well either way to make ~370 it had to be producing decent torque, unless it was maintaining it at high rpm.

Hmm, just to save the pennies now!
With just a good panel filter do you think it'd be down much on that?

I think my turbo needs attention.
I fitted a buddy club de-cat and had car mapped before even starting it.
And as soon as the car started to come on boost in 3rd-6th gear at 3.5-4k rpm the there is a screeching sound. The noise is gone then by 4200rpm.
The turbo still spools as quick and at same rpm, and provides as much power as before. It behaves exactly the same, only it makes the noise.
If you bring revs up to 4200 slowly then floor it, no noise at all.

Obviously being concerned that this is wrong, we put ori exhaust an map back on, and the noise is still there, only not near as bad.

Ever heard of this?
Do you know what my options are in terms of, getting turbo rebuilt, buying a new one while doing an exchange for old one?
To do this and be without a car for as short a time as possible. Its my everyday car.

Cheers

 

compressor surge?

 

[quote=Jolly Green Monster;9082718]compressor s

You are dead right.

 

very common on vf35 and vf34 just get it confirmed as that and it can either be minimised during mapping or worked around