If you wanted around 400 bhp out of a type uk sti what would you need to do to it.

Been discussing this with a friend and neither of us can deciede.

Also what costs would people expect?


look forward to peoples comments

 

I would say

Tek3
Full de-cat
3-port boost soly
Sti filter panel
Uprated fuel pump + regulater
Turbo (Andy F)
Bigger Injectors


400 bhp / 350 lbs

Well thats my guess anyway

I have the top 5 and made 332 bhp / 300 lbs at G-Force (Claims were made that the rollers were down by around 10 bhp that day so who knows maybe a bit more)

R.B

 

You may want to read this very interesting thread, although its a JDM and is better to start with. Not as easy as you may think.

http://bbs.scoobynet.co.uk/showthread.php?t=283364

 

Id say about 20K to make it reliable.

 

phew just finished rading the thread 2 hours later and I realise it's not that easy.

Bob has done a great job getting 360+ out of a fairly standard car.

top stuff

 

UK STI I think has a VF35 turbo, which is good for 350-400HP at the crank. I think you'll struggle to squeeze more than 375HP on normal fuel, maybe 400HP on race fuel.

The UK STI I think has 550cc injectors, which should be OK, so you'd need the following mods:

1. Turboback exhaust
2. Air Filter Panel
3. Aftermarket ECU
4. Boost control
5. May need an uprated actuator, as you'll need to run 20+ PSI boost levels

 

I don't think you'd be getting 400bhp out of a vf35, it's just a wee thing

If you want to run sensible boost you'd need to add headers to that, at the very minimum port the standard ones.

amongst other things.

 

STI8U claims 380-400 BHP on it with 12.0x quarter miles IIRC, both seem incredible for the spec, although people thought it was a wind-up on an earlier thread...

AndyF managed 11.7x 1/4 on a 300kg lighter car but with less claimed power (369 BHP), although he did have chargecooler, bigger turbo (16G) and a lot of octane, BUT APPROX THREE HUNDRED KG less than STI8U's new age STi.

The power claim is what people are getting from 20Gs over here, not VF35s which seem to be in the 310-355 BHP range. I personally find the lower end more believeable.

Holding more boost at the top end on Optimax with a VF35 actually loses power from what I found because you have to retard the ignition so steeply to accommodate the higher boost. So why the need for a stronger actuator?

I would question the measurements before believing a VF35 is that good. It is a nice turbo don't get me wrong, but 380-400 BHP???? Even 350 BHP is stretching credibility IMHO.

 

No one has mentioned the heads - can the stock heads cope with the gas flow required for 400bhp? Then you are into valves, springs, cams, followers, shims and verniers.

 

interesting comments guys

ive read with interest Bob Rawle's effort with his sti 9 and would find it hard ro believe anything more than 350bhp possible from the vf35 imho

bob's is the twin scroll turbo which seems a bit more lively.

interesting comments from pat in bob's thread about the Prodrive sports cat being able to flow 350bhp quite easily!!!

 

billythekid, the cam profile on the Euro spec STi is fine, the heads are small port though.

Some have struggled to get to 400 BHP with apparently adequate turbo, others have managed OK.

The turbo is the main limiting factor.

 

so is the concensus then that 350ish is the most you'd get from a type uk sti 02 model with vf35 turbo then?

RB has :-

Tek3
Full de-cat
3-port boost soly
Sti filter panel
Uprated fuel pump + regulater

and got 332bhp and 300 lbs ft....... seems very low to me bearing in mind the ppp packis supposed to give 305bhp and 299lbsft.

surely there can be bigger improvement than that or is is down to the type of parts you use and whether they mesh together or not?

 

Interesting thread, as this is what I'd like to do (once the warranty expires). 350/350 would be nice

I guess adding headers will help greatly on the torque side of things, as all the new JDM's etc have them as standard.

As for the regulator (the FSE one) is this the same thing as the FSE power boost valve, or is that a different item ?

What turbo would you recommend ?

 

PPP is 300 in old fashioned BHP, not 305, but often doesn't make this on rollers probably because of charge temperature and inadequate cooling.

At Star, I think about 320 is the most that has been seen on a VF35.

Similarly at Powerstation, don't know the results, but would eat my hat if 350 BHP could be produced with just a decat and map there on a repeated basis with a VF35.

At PE or G-Force, maybe. G-Force I think claim 355 for one of their packs with a VF35 IIRC.

It is not uncommon for the differences between rollers to be worth more than the mods that people are fitting, which makes for lots of unrealistically happy and lots of grumpy people depending on the error.

eg. my x pack on y rollers gets more than a pack on b rollers, when in fact a same day comparison on the same day rollers would have a better than x.

 

so is the new wr1 running a twin scroll or a vf35??

if it's running a vf35 then it's upto it's limit...... maybe thats why prodrive didn't go any further costs involved with new turbo's etc etc

thanks for your considered opinion john....

 

WR1 is not twin scroll, not certain if it is a VF35, I think it will be, didn't take much interest TBH, the JDM stuff is so much more interesting Prodrive obviously set their limit for multiple environments, tolerability on crap fuel, no gauges, different styles of use to OEM standards for warranty. That is where they say the limit is.

With bespoke mapping on individual cars with high octane fuel and gauges you can go a bit higher.

 

just add 100bhp shot of nitrous 750 quid bargain and safe with controller

 

The JDM 03 on cars are vastly different to Eurospec. Inlet manifold, heads, pistons, fuel system, headers, up pipe, downpipe, turbo. My car makes this and is a happy chickem but it was the induction that made the differences, I do run Optimax and booster as std mind.

The VF35 has a restricted trubine housing and so its good for spool but not for top end power as it runs out of puff. The Std VF34 is better up there.

Its possible to ring 350 out of a car with either and suitable supporting mods but not with the std airbox intact. 330 to 350 is the mark depending on the car and mods, thats estimated as if the car was run either at GForce or Power Engineering or Prosport which all produce comparable figures to each other normally, RB's run was stated by GForce to be low as they had just replaced something on the setup, Chris said about 10 bhp down according to the norm.

Bob

 

When i had my run at G-Force there was a sti8 ppp which only got 274 bhp / 270 lbs To my 332 bhp / 300 lbs so there is a big difference.

Also had a R-R day at John Nobles

My car 307 BHP / 275 LBS

STI 8 PPP 251 BHP / 245 LBS

I know the figures were low that day but as you can see from both runs there is a big difference.

R.B

 

2.33 engine
uprated gearbox
front mount
matched turbo to engine to exhaust
fueling
intake

all ='s well over 400 bhp

 

Bob

You've been watching too much Big Brother as I'm sure you just used a phrase including the word 'chicken' unless its catching on and you've been speaking to Jonny Gav or Mr Guiness to much!!!

Others

400 bhp should be relatively easy with the correct Turbo........... (I cant emphasise this more strongly......it makes a huge difference!!) Just get in touch with Bob/Roger Clark/Lateral and you will be sorted - afterall 10.85 secs on a 2 litre cant be bad depsite the fact that the organisers hold the event in August - derrhhhhhhhhhhhhh dumb or what..............

Steve

 

A 2.33 should do well over 400, I was relating nmy comments to the assumption that the engine would remain stock.

bob

 

Whats the problem with a hot day Steve ?

Andy

 

Andy

Ooooyyyyy

I see you came up trumps again - Jeez you dont half work fast........ some people have been messing with their higher capacity engines for ages and still cant show any results................

Wish they would do Elvington in say May/June when its a bit cooler..........

 

I ran at G Force months ago and was very happy with my results,

I ended up with 317 BHp and around (probably a little lower than) 310 ft lbs.
Its a MY03 with PPP and H&S decat and rear section and Panel filter

There was another MY03 PPP (totally standard) there that got 296bhp and the same figure for FtLbs

Heat soak is a major concern in these as the first few runs kicked out 270 bhp!

Im toying with the idea of a Tek3 map and I have nice MD304 to stick on... Either that or sell it and go for a 16G?????!?!?!?

all ideas at the moment.....

 

Tek 3 and the 304 would be a significant improvement on your current numbers

16g versus 304 - dont know the spool up and bhp differences - but I'm sure Andy F or Lateral would know the answer to this one

 

I had the MD304 and the TD05 on on the same day and did power runs. Top end potential similar, TD05 is perkier and earlier to spool up, and also a lot tougher.

 

So there you have it td05 16g

Now back to the thread

I think the easiest way to get 400bhp is to get rid of the Scoob, buy an Evo, run it at 2.2 bar and as airfield days show it WILL cope.............. and be good for over 400 bhp