Can anyone advise me which turbo would be the best upgrade on my sti7 its got tsl's 333 pack on it already and would a new turbo bolt straight on or would i need a new up-pipe

 

mate just put on a 18g on his bug eye sti

he also fitted an uprated fuel pump and regulator

not sure about up pipe etc as he has changed all his

ask andy f as thats where his turbo came from, think its less laggy than the 20, althou i think i will be going for a 20

 

Cheers mate,does your mate think it was worth doing

 

well his turbo gave up on him, so it wasnt planned really

his car made 377 on the rollers and he says its very good on the road

 

You need alot of help to make those scoobys move. The td05 unit is of course mitsubishi made. Carls berg dont make evos but if they did it would proberbly be the best in the world. Only joking. Looks like a visit to andy f's then.

 

An 18g is a very good turbo for someone that doesn't want to rev to 8000rpm. It is better than the 20g in a number of ways; lag and surge resistance in paticular. It will only be about 20hp shy of a 20g in power, but on most cars I think it will give a more rounded package. I have put one on a '333' equiped car and it gave a useful gain in conjunction with a few other bits.

Paul

 

Not much between the 18G and 20G on this model of car. Go for the 20G if you like to quote dyno numbers or 18G if you prefer a stronger midrange.
For either option an aftermarket uppipe and 3" exhaust will release the best power. Some of the 2.5" systems such as the H&S also work well but others such as the PPP and TSL Gp N come down to an even smaller bore in the backbox and this restricts power.

Andy

 

Is the oe STI uppipe that restrictive ? Isn't it only the wrx that have a cat in the uppipe ?

 

Not nearly as restrictive as the wrx cat but once over 350 bhp changing it does have a +ve effect.

Andy

 

My car is having a 2.5 conversion done this week and I am not decided which of these turbos to go for. Requirements are lagless as possible, not chasing big bhp to brag about, just low down torque

 

Its a TD04 thats fitted to the new 2.5 WRX, use a hybrid version of the TD04 for 320bhp and instant torque/zero lag.
I bet you want a bigger number

 

Its a 97uk conversion and yes a little bit bigger

 

Be a man.
Fit a 20 g as you WILL chase a bigger number!
Graham.

 

The 20g is part of the spec, but I have an option to change if it is not to my liking.

 

I've got the 20G on my MY02 STI and its great.

No noticable lag, pulls real hard.

 

Andy, I've got an '03 wrx with full decat inc uppipe and downpipe - remapped by Pat H. Would one of your hybrid TD04's get me much more safely with standard intercooler and injectors and map tweak. Must be somewhere between 280 and 290 bhp at the mo. Ta.

 

Fuelpump and exhaust and remap is a sure thing, but do you need bigger injectors for the 20g / 18g on a STI?

Would a HKS uppipe be ok?

/Jesper

 

For a 2.0 engine 18g all day long.

 

Also on a 2.0 STI ? Will the 18g not run out of puff ?

 

What 16g not good enough to mention here

 

my 18g does 1.5 bar to the redline.
Depends on how much puff you want

 

My TD04H will produce 25-40 bhp more than the std TD04 but with no loss of spool up and increased midrange torque, it will run on the std injectors on a WRX as long as you uprate the fuel pump.
I'd also recommend an upgraded turbo to intercooler samco 'Y' pipe.

Andy

 

No, the Sti injectors cope fine as long as you have an uprated puel pump keeping the pressure up !

Andy

 

Super 16G rated at 310WHP.

@585CFM is not that bad.

 

Hey Andy,

Are you telling me here I should stay with the 18G instead of the 20G?

/kristian

 

For the road you would be hard pushed to tell the difference in performance between the two turbos, on track or dyno then the 20G will have the edge.
To be honest I have found there is a greater difference between two similar spec cars than there is between the turbos.
I've not sent it yet Kristian, it's not too late to change your mind !!

Andy

 

Andy, Im just about to buy a new turbo, (had boost creep probs but, ported standered turbo) still not happy with it though.

Ive been looking at your 18/20g turbos and the APS sr44, what i would like is about 400bhp but good midrange torque.

I allso suffered compresser surge at 3200 to 3250 rpm, which by dropping boost targets at part throttle helped.

What turbo would you suggest and could you tell me why?

Allso in above post someone asked about injectors i have standered STI ones and there on nearly 90% duty cycle, my car currently makes 372bhp 1.5bar boost, this must mean they have not got a lot left??

Sorry to but in on someones post, Jase

P.S. 2003 STI uk APS fmic APS 3 1/2" exhaust etc.

 

I very much doubt your car is producing 372hp on a vf35, infact I will say it's impossible to do on pump fuel without detonation.

A good test would be to put your car on the dyno today, and see if those initially high numbers remain, or whether the car has seen sense and retarded the ignition to a point that the car will not detonate itself to pieces.

Put it this way, I would say the 18g is good for about 380hp, perhaps 400hp on a "good car". But it will make 40-50hp more than a vf35 all day long.

Paul

 

It is probably best to talk in bhp steps rather than actual rolling road figures. A typical figure on an average car may be 370-385 on an 18G whereas a typical figure for a VF35 is usually in the region of 330-345 so we are talking about a potential airlow step increase of approx 40bhp (in my experience) The 20G may add as much as 20bhp again on the correct set up although midrange torque may be 10-20 lbft in favour of the 18G if you run higher boost in the midrange.
Injector duty depends on the AFR the car is tuned to and whether the fuel pump is able to maintain the pressure or not. Increasing your fuel pressure by 0.5 bar via an adjustable regulator will allow an increase of 10% flow (read power potential) for the same IDC.

Andy

 

Neck of VF35 well and truly rung?