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what the f

1.5K views 23 replies 12 participants last post by  meangreen240  
#1 ·
ok this might seem a little gay but i have a 97 auto with a ka24de-t. i just got done with the install, but havent connected the downpipe to my exhuast so the car is very loud, it also hasent been tunned yet.

im running 8psi and i punched off with my buddy in his new wrx its still bone stock. and yet he can pull on me a little from a punch!

everything ive read on a wrx says they run about 175hp at the wheels, my turbo kit shout make about 230hp at the wheels, so how can a heavier car with only 175 beat me from a 40 mph punch?

that means i must only be making about 175 whp
does tinning make a 65whp difference or am i missing something?

what do you guys with tunned ka24de-t engines at 8 psi do on the dyno and against a stock wrx? i thought with the addition of a turbo kit and bolt ons my car would be faster.
 
#2 ·
it also hasent been tunned yet.
looks like you just answered your own question, plus the drivetrain loss through the Auto, i wouldnt be surprised if your untuned KA-T is putting 175 or less to the wheels. You also didnt mention what you are running for fuel managment or turbo size.
 
#4 ·
very possible. my car untuned with 370cc injectors only made 189 at the wheels. after it was tuned ( conservatively ) it made a peak of 247whp, but we could not get that number to come up again, so we settled for 230ish at the rear wheels.
 
#6 ·
tuning is big, also very dangerous to not have done promptly and properly. not sure if you are correct about your 8 lbs, but atleast with people with manual boost controllers, they think they are at 8 lbs (or where ever) and it ends up they are boosting nothing or like they have the turbo set at max boost in which the turbo isnt even spooling properly/ at all
 
#7 ·
ive got the 5-7 psi spring in my wastegate and i adjusted the top screw to get 8 psi. the car is boosting fine. i just didnt know that just by tunning the car i could pick up 30-60 whp. and me and my friend raced from a 40mph punch not of the line this is why im concerned , i think at a 40mph punch my car should destroy that stock wrx! but thanks for the input guys. and s14 tat your response shure makes me feel alot better, if i can get 230 whp after tunning i think ill be perfectly happy and feel as if buying this kit was justified!
 
#10 ·
meangreen240 said:
ive got the 5-7 psi spring in my wastegate and i adjusted the top screw to get 8 psi. the car is boosting fine. i just didnt know that just by tunning the car i could pick up 30-60 whp. and me and my friend raced from a 40mph punch not of the line this is why im concerned , i think at a 40mph punch my car should destroy that stock wrx! but thanks for the input guys. and s14 tat your response shure makes me feel alot better, if i can get 230 whp after tunning i think ill be perfectly happy and feel as if buying this kit was justified!
Has a lot to do w/ gearing too...if im not mistaken he has 2 more gears than you..

and yes, tuning makes a large difference
 
#13 ·
stock 9.5:1 8psi, to4b, 25x14x3 front mount, ur pulley, intake, 3inch downpipe, no cat, apexi n1 exhuast, walboro 255 fuel pump,

with tunning i think i should be good for 230 whp

is this resonable or am i nuts?

if thats the case a stock wrx will be no trouble right!
 
#18 ·
hmm when i first read the post i was questioning how you could be making 230whp on an auto with 8psi. stock on the SR is 7psi, and that's only like 180whp... chances are since it's an auto you're not quite making it up to redline, where some power could be... ik it said you should make that much, but maybe all your boost hasn't kicked by the time it switches gears. also depends on where your turbo spools up at, if you're just coasting in an auto you're prob not above 2500, or 3000rpm, most turbo's don't spool that low, which could also explain why he took a jump on you.... just how i see it, IDK exceptionally much about turbo's etc. only other thing i could think of is that you have your afc tuned for n/a, and you need to put more fuel in cause you're doin the turbo thing now... ??? who knows sorry.. LOL but good luck
 
#19 ·
If you're running an FMU, then I see no use for an SAFC, and there is nothing for you to tune. An SAFC's basic purpose is to trim down larger injectors. If you're on stock injectors w/FMU then there's nothing to tune. An FMU gives you a straight fuel curve.

I think one problem would be your turbo. A T04b is a big turbo for only running 7-8psi. And I wouldn't exceed 7-8 psi with an FMU either. Past that you will want larger injectors and something to control them.

Furthermore, if you haven't even dynoed yet, then you have no idea of how much power you're putting down. You should dyno it before you even begin to ask this question.

Shorty240:

Stock S13 SR's use a T25 turbo, which is MUCH smaller than a T04B. 8psi from a T25 is going to be nothing compared to 8psi from a T04B. You're also comparing 2 different engines. Also, a T25 will begin to spool at 2000 rpms. But yes, a T04B may not begin to spool until 3000rpms and threshold til 4000.

By the way, I know who you are Shorty240....
You live like 2 miles away from me. I drive by your car almost everyday. You should come out to the races sometime and we could talk.

curt
 
#20 ·
yeah i was thinkin about the fuel. 8 psi on stock injectors are not goin to get that kind of power. thats why i guessed at 180-190ish whp. also the auto is not bad once you hit boost cusae you can stay in boost between shifts.
 
#21 ·
if i have my auto tranny in 2 for 2nd gaer i can easily take it to redline, im just wondering why the manufacturer claims 240+ whp on a 240sx ka24de that is stock + there kit. s14 tat i have the exact same setup as you do except im have a nsport intercooler, why would i only make 180-190 at the wheels with 1 pound less than you.
i know it hasnt been tunned yet but nsport claims 240 at the wheels on a stock ka24de and i want it. why would my car be any different the engine only has 56,000 miles. im going to get it tunned in about 3 weeks i hope i can hit 230-240whp
 
#23 ·
Probably because of the lack of tuning and the downpipe not being connected.
I can see proper tuning being a 50hp difference or so. Wideband o2 sensor tuning is awesome. :thumbsup