Hi im in need of some profesional opinions, i am just thinking of putting a bigger turbo or turbo upgrade on my 06 STI TYPE UK whick i have had re-mapped by JGM to 340 bhp, i think the time will soon come for some more power which i thoght i would never say, LOL.

 

what are you asking then?

 

sorry which turbo , how much power will i get and roughly the cost, oh and will it still be ok for the odd track day.

 

MD321H for 400 bhp 2.0 road car, like mine, T or bigger for a 2.5. Sorry I don't know which yours is....

See Lateral Performance for details.

HTH

dunx

 

ok cheers dunx, im sure one of the gods will appear soon , lol

 

321h if you're spendy, perhaps a 20g with if you can find a good one cheap. Coupled with the stock TMIC, injectors, 3" exhaust, fuel pump and remap you can see about 380hp.

Go to 321t with bigger injectors and aftermarket headers to see comforatbly over 400hp, but then be ready to replace the rods and pistons in the engine.

 

ye thought it would lead to internals, i called one of the engine tuners for a quote on stronger internals, £ 6,000 aprox was their quote which i just can not justify spending.

 

who was that with??

 

RCM, im not in any way saying their expensive as its the only quote i have had, its just a ridiculas amount of money for me to spend on a car thats worth around £13,000 when i only use it as a 2nd car.

 

Agree with Paul, done few over the 400 on standard internals but generally best to stick to under 400

Simon

 

The std turbo can make 360-370 (or slightly more) with a few little mods and attention paid to cooling the air into the engine.

For the extra 10 bhp on top of that for a 20G is it worth spending out on a turbo, fitting, bigger injectors (or fpr), cold air induction kit... ? I'd say no.
For an extra 30bhp is it worth spending on a 321H over what you have ? Mark would probably kill me but i'd spend your money on a years worth of track days

The road over 400bhp is littered with expense and I remember our first conversation in that you were asking whether the 2.5 sti is reliable. In where it is at the moment it is (as I said at the time), start pushing the power/torque too far towards the edge and it can bite.

To go properly over the 400 mark ... Pistons, rods and proper bearings can be done very well for around £3000 all in. Then you can put on a proper turbo MD321T or V but would need clutch etc etc etc. Very easy to spend another £4000 (on top of the rebuild) on the basis of 'while it is out'.

I'd stick with the current turbo and get a little more out of it.

 

What did you get yours to Simon?

 

Simon hasn't got a Hawkeye 2.5.

 

my mistake!!

 

I don't have a 2.5..

my current daily drive is blob eye sti standard 2litre engine.. 451bhp.

Simon

 

what would the difference in performance be between the 321H and 20G on that spec, difference in lag, torque etc??

 

peak power and peak torque would be very similar but the H tends to be more crisp and better throttle response than 20g. Not that there is anything wrong with the 20g but the H it more useable imho.

Simon

 

does the 321h come on boost earlier than the 20g?

 

the 20g can vary so much with regards to spool yet the H more consistent..

I gained 250rpm of spool on my own car changing from a 20g to an md321T, H is about 200rpm ahead of the T.

Simon

 

Sorry to thread hijack,

Simon if i was to stick a full milltek system on my hawk 2.5 sti, would it be worth putting a set of 650cc injectors on at the same time, ready for a bigger turbo later on?

BTW i already have the injectors.

cheers

Rich

 

thanks for the info,
Iain

 

What budget do you have and what other mods are already fitted?

20g has done me fine as I didn't want to open up the engine and also makes up for the noticeable power die off that the VF43 has at 5.5k+ rpm.

If you can wait a couple of months, all my kit is likely to be stripped off and sold.

 

I would wait until you do the turbo..

Although you could fit them but there is no need, plus you would have to drive it off boost and perferably not much once injectors fitted until remap.. likewise when you in future change the turbo so you may as well just keep hold of them until you do the turbo.

Simon

 

do you think i would be able to run an md321t on the standard engine or is this asking to much?

 

Not and fully used.. ie. not at 450bhp and if wanted safe then better to put a smaller turbo like the H or 20g on etc..

Simon

 

360-370hp? Is that based on your road dyno results which I seem to remember resulted in 340-350hp on a rolling road?

The difference between a 321h and VF43 is quite noticeable and on it's own is quite a good upgrade if you don't want the hassle/cost of also doing tubular headers, a 20g is even better value but the results as Simon says can be variable.

A little misleading to suggest you can just "get more out of it", the VF43 is not a volume control!

 

Hi duncan what can i do next then to get her upto 360 ish mate.

 

It was dyno'd at 356 / 402 on the Maha at Clive Atthowes and a road dyno done at the same time as a benchmark for further tuning. Further increases in performance were over the benchmark road dyno Paul which showed a definite increase in power and acceleration times. Unfortunately I don't have these anymore as they were on the laptop that got stolen a couple of years ago.

 

What have you done so far?

 

removed the center resonator different back box and re-map by JGM the car has all ready got the uprated fuel pump as it came with the PPP, cheera ateve.