Razor2001

Howdy,

Is it at all possible to achieve 350 BHP, 320 TQ by the following route ?

Car: JDM STi7, 35,000 KMS

Current mods:

2.5" Inner diameter full decatted zorst from turbo back (Scooby Sport)
Uprated Walbro Fuel pump: 255

Mods to achieve the 350 BHP and 320 TQ:

Uprated Turbo....which one ?
Remapped Original ECU (Planning to fly someone in from USA).

Now the difficulties: We no longer get 98 RON gas here anymore. Will have to be setup on 95 RON !

I want it to run det free in the dead heat of summer: 35 C

Planning to keep the stock STI TMIC.


Is it possible without any other mods other than the zorst, fuel pump, turbo and remmap ???

Cheers,
Ray

Razor2001

Bob ?

Andy.F

To compensate for the lower octane you will need to fit a bigger turbo in order to achieve your goals. This is something best discussed with your mapper as he will (should) be the expert when it comes to your cars power production.

Andy

Razor2001

Hi Andy,

I agree....I definately want a turbo upgrade and know that I will have to in order to have a chance at achieving my goals....

My main question is CAN I achieve my goals with a turbo upgrade or is it impossible with my 95 RON fuel and high ambient (35 C) temps ?

Cheers,
Ray

Andy.F

Yes it's possible, a turbo capable of breathing 400bhp on 98ron and UK ambient will however be pushed pretty much to its limit to make 350 on 95ron and 35 ambient with a tmic.

Andy

Razor2001

OK great

Will I have massive more lag than I do vs. stock setup with such a large turbo required ? Will this mean I will have horrible low down and midrange pull ?

Cheers,
Ray

Razor2001

What would be the turbo recommended ? Should I have a induction kit stuck on the same time (will this make things easier ?)

Please see above question as well experts

Cheers,
Ray

Razor2001

bttt....

Looking for as much advise as possible for this route as I don't think this USA mapper will have as much experience on a JAP STi7 as you guys will.....wish I could afford for a UK mapper to come down here but the trip is long and the tickets are not cheap

Razor2001

bttt

SamUK

iTrader: (1)

Why don't you find a mapper from the Uk....

Razor2001

I live in Nassau, Bahamas - 8 hour direct FLT $1,000 ticket from UK to The Bahamas hardly worth coming for 1 night as well so the hotel would not be cheap.

Miami, Florida to The Bahamas 45 min FLT $180 can come on 6am morning FLT overnight and leave next day afternoon.

Now do you see the reason for a USA mapper vs. UK ???????????

Obviously I would love to have one of the experts on this board map my car but as you can see it would cost me over $1000 more with air ticket difference and hotel for a few nights. Also, if something is not quite right or they need a part then its only a 45 min FLT away from Miami, Fl.

Obviously I am open to suggestions. I am just a little upset about the 95 RON gas situation and having to retard my car through DD. I am probably getting no more than like 255 - 265 BHP out of my car (it came stock with 276 bhp on 100 RON and now due to fuel even with decat less than stock...LOL). Strongly thinking about selling it and buying some Normally aspirated car that will not have to worry about the high octane fuel, maybe a Ford Mustang Cobra or Camaro, big V8 motors producing over 300 to the rear wheels sounds fun but I would miss the AWD I can not lie.

I much rather keep my STI but only if I can get her up to about 350 BHP, reasonable low and midrange TQ and safe on 95 RON and 35 C temps in the dead of summer without having to go internal. Most I am willing to do is induction kit, turbo and remmap. Right now temps are 20's C and can drop into the teens but its the start of 'winter'

Cheers,
Ray

john banks

Ford Mustang Cobra, did you see the post on NASIOC about just changing the pulley, exhaust and ECU and adding something like 150 WHP? I'd be tempted in your position to get some lazy big power

Razor2001

John,

Yea it is quite amazing what those things can run.....course they are running V8 vs. our 4 bangers

Best thing is the fuel and ambient temps are not really an issue.

You think I can make 350 BHP with bigger turbo, induction and remmap with my fuel and ambient temps ?

Cheers,
Ray

Nathan L

Can you not just use a whole bottle of octane booster to bring the fuel back up to 98 ron ish?

Razor2001

The best Octane Booster you can get is NF as tested by that Auzzie Independent test....that raises the rating by 2.8 RON octane points. Not bad however you can not get NF in the USA so I am stuck with the same problem of having to fly it in from the UK. I would imagine I would be looking at like an extra $15 every fillup. I would rather just be able to go to the pump and fill up and be done with it.

Keep the ideas coming though

CHeers,
Ray

Razor2001

bttt

Andy.F

If you can wait until January, I will be tuning a Sti7/8 to a similar spec as you have. I can map it on 95 ron and let you know how much power difference there is from 98ron.
With the current price/availability of Optimax (98ron) this is a request I get quite often so it will be interesting to get the actual numbers on it.

You need not have massive lag if you use a TD05/06-20G, lag/spool up time is similar to the OE Sti7 as it comes from the factory. The original turbo can of course be remapped to boost even earlier but is some 50bhp behind the 20G in flow capacity.

Andy

john banks

Fiddling around mapping a decat STi 7 with NUL was a dismal experience. It completely killed it, timing had to be removed by the bucket load and it felt flat, they are heavy cars need a bit of power and torque to get them feeling nice IMHO. Doesn't help that a decat STi 7 can boost creep and overboost with the result that you may have to then detune the car to make it safe if running NUL. Even only 150 BHP per litre with little lag on 95 RON with 8:1 compression isn't a nice combination IMHO.

Bob Rawle

Ray if I were you I would forget about the high end power and consider focusing on maximising torque, using NL you will never get good top end in an Impreza whatever turbo you use, engines not designed for it, however you can get good low/mid range torque up to say 6500 rpm. from my personal experiences with NL 310 ish should be possible using say the VF34 but the low mid end punch is still there even at that.

I would not recommend going for an NL down grade though unless there is no other option. the best NL car I ever did produced 310 ft lbs and 300 bhp iirc, that was a MY99 GC8 using the std TD04.

if you want to point your tuner in my direction feel free.

cheers

bob

Razor2001

Hi guys thank you very much for all the input.

Bob I completely agree as far as midrange and torque. I have no problem running less than the 350 BHP if I can get a nice 2500 - 6500 rpm punch and then drop the boost down etc between 6500 rpms to 8000 rpms for safety reasons.

My main goal is to run safe on the 95 RON 35 C ambient temps and to have better figures than the stock bhp and tq (which is like 276 / 270 on 10 0 RON). I assumed that going to a bigger turbo would help flow more air and make this goal easier.....are you saying that I should just keep the stock turbo and maximize the map with this ? I was thinking that a bigger turbo, and intake would make these goals easier but I guess not ? Oh, I would like a blow off valve in there for fun but not necessary

I will have to talk to this USA mapper and see how knowledgeable he sounds....

Sorry but was not 100% clear on your posts John and Bob, go to a bigger turbo or not ?

Andy, I am looking forward to your results with the 95 RON remmap

Cheers,
Ray

RobJenks

Cut the 95 octane with 20% toulene

nom

I'm just wondering why WI is being ignored at this point? Surely it's a perfect situation to use it in? Particularly if a spot of meths is lobbed into the mix, as that should be reaonably available and as it's only used on-boost, it's cheap & the advance is available where needed? (is there a reliable method of cutting advance or something if the injector fails/water runs out, though? Never really looked into that bit ). Even more so, placing the injection pre-compressor (if the compressor's up to it) would/should effectively shift the turbo's flow rate up a notch too? (or the efficiency up - whichever way round you want to look at it )?

nom

Toluene may also not be the easiest chemical to get hold of, and I am still unconvinced of the joy of storing dozens/hundreds of litres of the stuff about & lugging it about for when a fill-up's needed.

Razor2001

Hi guys,

My goal is to get away from having to do anything additional besides adding gas when needed. I could possibly handle adding some commercial pre sized octane booster but not prepared to mess around with toulene or having to fill up a WI tank every so often. Also, I figure when it is time to sell the car it will be easier to sell if they only have to add gas and not mess with anything else.

Cheers,
Ray

Razor2001

bttt

Razor2001

bttt