Stiver3

Hi

Still looking into power upgrades for my scoob , i've gone off the 400HP idea, which i asked about a few months back...instead, im looking for around 340-350ish mark, with similar high torque if possible.

I was thinking of a turbo from a spec c or late STi, because i would really like a rapid spooling turbo rather than a laggy one, apart from the injectors, fuel pump blah blah, could i use my standard STi Top mount??, as fitting a Sti8 after reading through 911's thread seemed a bit of a task!!

Car is a 97Sti


thanks for any help!

scooby-k

the later twin scroll turbo wont fit on classic headers, up pipe r different afaik
you could go for a vf28 off sti5 or P1 just about manage your power figure

4wheel

iTrader: (2)

have got 303 bhp and 322ft/lbs torque,with headers turbo back magnex system and ecu chip on my 95 wrx import well happy

JIM THEO

Ask David from API engines he sells twin scroll kits that include all necessary parts (manifold, oil pan/stick, downpipe, turbo etc).
JIM

APIDavid

iTrader: (4)

Thanks Jim, You're correct we do sell that, but in this guys case I am not sure that he will get where he wants to be, and certainly not cheaply. The VF28 from a P1 / STi 5 or 6 won't make any difference, that he notices, on what he has now.

Porting and polishing his headers and lighter flywheel [ 7 kgs ] will almost certainly be the best [ cheap], simple option and in my experience seems to do exactly what he is looking for.

David APi Engines / APi Impreza
www.apiengines.com

Stiver3

Cheers everybody for the replies,i have a set of headers waiting to go on here, so i will see how they work.

I still like the idea of a new turbo, but its probably not worth the hassle; as said,if my current one can be pushed near that figure...the Api set-up does sound tempting though

scoobyDAZZA

vf34

STI8U

Maybe a Power Enterprise PE1818 - these are modified IHI turbos with larger compressors that have the ability to flow 18m3/min (635CFM). They are good for 350HP+ and have good spool as they have the P18 turbine housing (same as VF23). The PE1820 is also an option, good for 400HP+ but has quite a bit of lag due to the P20 exhaust housing (same as VF22)

Both of these turbos should be a direct bolt on too....

A twin scroll conversion will give you the numbers you are looking for with high torque, but lots of $$$$$

Check out http://dyno.scoobynet.co.uk/uk/andrew_tang2.htm, this is a PE1818 setup making 354BHP/298lbft. Torque curve is a little laggy for a PE1818, that turbo probably doesn't like the FMIC on the car.

Neilo

thast pretty low torque for a PE1818 isnt it? or is that normal? i would have expected more 330lbft?

john banks

VF23 has a P20 turbine housing.

Aftermarket headers or bigger turbos will kill your spool up. From experience I would avoid VF hybrid turbos as despite posher bearings they don't give the overall response and power band of a TD05 based hybrid IMHO.

A good remap with your stock turbo, ported headers and an intercooler upgrade would probably be best bang for buck.