imfomation on impreza turbo upgrade on gc8

[chappell943]

A stock sti would dyno at about 175wkw so 220wkw would be a massive gain on the bum dyno, with most sti's anything over and above 220-230kw becomes a much bigger investment.

220wkw is alot of fun and will see you reaching 100kph in sub 5 seconds and getting from 100-135km in 2.8sec (According to my datalog on V7 sti).

[whatchain]

sorry i dont normally use kw. roughly how many bhp is 220kw atw then?

[chappell943]

295whp and stock they are roughly 235-250whp. All this depends on the dyno as well but you will definitely notice a difference if NZEFI can take your car to 220wkw.

[whatchain]

mean. im getting the thing on the dyno this saturday anyway. will see what the figure shows first. then go from there.

[chappell943]

Awesome, make sure to get a dyno chart and post it up!

[whatchain]

would probably be embarrassing lol but yea will do

[whatchain]

 chappell943 said:

A stock sti would dyno at about 175wkw so 220wkw would be a massive gain on the bum dyno, with most sti's anything over and above 220-230kw becomes a much bigger investment.

hang on a minute, u saying a tune could potentially get me 45Wkw? if thats true then WOW:o . i've been reading it all wrong lol, not very used to kw or wkw. more of a hp person . but again like i said will see the figures this saturday. ;D

[Guest]

Flywheel power is higher as no drivetrain loss comes into play...206kw fw and 175kw atw shows you the difference. I think its estimated at roughly 25% drivetrain loss. A tune is the best thing you can do for any car value for money IMO. Go in a tuned car you will see the difference. You can get gains out of a factory car and as soon as you do mods your tune goes out of wack and sometimes for the worse. Throw a bigger turbo on you may notice a slight increase in power say 5kw then tune it for an extra 20-25kw over your whole rev range. You need to tune when you change your setup. In saying that mine isnt yet but as soon as I can I am.

[chappell943]

I'd say youll be look at at least 25-30wkw increase which will be alot

Of fun, but it's not all about the final number as you'll find the car will hold boost better, be smoother through the rev range and potentially have better low down torque.

[pedro]

Most importantly the tuner will check and set A/F ratios and check that theres no detonation occuring=Peace of mind....

[AdamOst]

Why do tuners hate v6's :< Looking at similar power increases in the future and its a pain having to buy a link as well instead of just tuning the factory ecu.

[lunchie]

I have driven a stock v7 sti and then an ecu tuned v7 sti. Was the difference between, heh, this is pretty cool and DAM this thing moves.

[whatchain]

Heres my car on the dyno today. car was running very rich. got video and sheet with figures.

Uploaded with ImageShack.us

[chappell943]

Nice vid! Im sure I saw this going down clyde road last night by Medbury school? You still going to go ahead with the tune from NZEFI?

[whatchain]

lol yep thats me. i was talking to the guy at spec performance, he said i could get a fuel controller then get a tune to lean it out. i could be looking at 20-30% better fuel economy and maybe about 15-20kw in power?? i would be looking at around $500 for controller and maybe $400 for tune. if thats the case. it does seem a lot cheaper then getting a retune by nzefi for like $1400.

just thought i would also add. there was a v7 sti there, stock standard on 18psi. dynoed at 160kw atw! :

[chappell943]

 whatchain said:

lol yep thats me. i was talking to the guy at spec performance, he said i could get a fuel controller then get a tune to lean it out. i could be looking at 20-30% better fuel economy and maybe about 15-20kw in power?? i would be looking at around $500 for controller and maybe $400 for tune. if thats the case. it does seem a lot cheaper then getting a retune by nzefi for like $1400.

just through i would also add. there was a v7 sti there, stock standard on 18psi. dynoed at 160kw atw! :

Id says you'd be better spending slightly more for NZEFI to tune it as that way you can smooth out/alter ignition timing and boost tables as well, but can't say I have any experience with a piggy back fuel controller so can't really comment. Interesting about the stock v7 sti though! although they do pull alot of timing out of the tune once they start running on New Zealand fuel.

Edit: Also stock boost is meant to taper to 12psi at redline!

[Kiwi_Fozze]

Having driven a v8 sti on standard tune then custom tune was a massive difference... Standard tune was "damn thats quick", custom tune at 23psi, fully customised timing, fuelling, wastegate, ignition and avcs maps, only made 200kw atw, but that thing was savage.

I guess what i'm saying, is go for the nzefi tune, you can lean out the fuelling on the standard ecu with no need for a piggyback, and you can often get the boost to sit quite a bit more solid.

[Timmah]

 whatchain said:

lol yep thats me. i was talking to the guy at spec performance, he said i could get a fuel controller then get a tune to lean it out. i could be looking at 20-30% better fuel economy and maybe about 15-20kw in power?? i would be looking at around $500 for controller and maybe $400 for tune. if thats the case. it does seem a lot cheaper then getting a retune by nzefi for like $1400.

just thought i would also add. there was a v7 sti there, stock standard on 18psi. dynoed at 160kw atw! :

Yeah that's my mates v7 sti. Running rich as too which might explain the low (is it low??) figure. He also said it's only boosting 15psi.

[whatchain]

swet, thanks for advice u 2. i think thats what i will do then. but will probably get it done maybe next month as i have other plans for now. will post results again once done.

[whatchain]

Yeah that's my mates v7 sti. Running rich as too which might explain the low (is it low??) figure. He also said it's only boosting 15psi.

15?? i saw his dyno sheet. it says 18psi?? is his name seb and drives a white hatchback sti?

[Timmah]

 whatchain said:

Yeah that's my mates v7 sti. Running rich as too which might explain the low (is it low??) figure. He also said it's only boosting 15psi.

15?? i saw his dyno sheet. it says 18psi?? is his name seb and drives a white hatchback sti?

Totally wrong guy then! My friend has a V7 STi sedan, blue with massive rims.

[whatchain]

oh yes that, i saw it parked across the road from spec. (you ccould almost see those rims from space ). dont think it went on the dyno tho.

[chappell943]

v7 sti's call for stupidly rich fuel targets under boost, I imagine the gc8s must be similar, look forward to seeing the results of nzefi's work.

[Timmah]

 whatchain said:

oh yes that, i saw it parked across the road from spec. (you ccould almost see those rims from space ). dont think it went on the dyno tho.

It did, saw the video and it did 164kw.

I'm also very interested to hear how the NZEFI tune goes Whatchain if you go that way.

[whatchain]

yea, i will get this done probably next month. will also share all the details and stuff too on the re tune.