KA + 8psi = 13.6 @ 104

[:: orion ::]

This is a cut-and-paste from over at Freshalloy, but I figured I'd share here as well...

Took my custom KA-T to the track Friday night for the second time. I am not a big drag race guy, but I like to know what the car will do...

Last time out it was at a little over 6psi and ran a 14.2 @ 100.7mph...

Now, I added a GReddy VSPL intercooler and turned the boost up to 8psi.

Ran OK for most the night...14.0 @ 102, 13.99 at 102, etc...but I wasn't launching at all = 2.4-2.5 60' times.

Finally I quit being a p*ssy and launched the thing (2.2 60', still not great), and ran 13.6 @ 104mph!!!

I was quite happy, the car is much faster and more fun than I ever expected - This is more power/speed than I need for what I want to do (track days + auto-x)...I figure right at 250rwhp.

Anyway, it did not suck...

This is a '96 SE, full weight (sunroof, stereo, etc...2860lbs without driver) with a KA-T: T3/T04E, 57-trim, TiAL 35mm vented externally, GReddy FMIC, RevHard, 2.5" full exhaust, S13 cams, Hacked MAF + 370cc injectors, JWT N/A ECU with base timing backed off 5 degrees for turbo use.

Later - Brian :ylsuper

[ullose2]

cool but id up the boost

[red240ne]

cool but id up the boost

you don't need too much boost for AutoX. Maybe a little more, but if you boost too much, then your turbo will never spool up, because there aren't really straightaways.

[ullose2]

i see , so drag racing aint your thing

[:: orion ::]

Yeah, drag racing isn't my favorite...I prefer handling over straight line speed.

ANd as for more boost - I can't get much more out of the 370cc injectors - 9psi may be safe, 10psi would max them out with my setup.

They're only good for ~275whp or so MAX, and I'd bet I'm only 15-20 HP from that now.

Later - Brian

[cow]

Wow, that's very impressive.. with some godly driving you could skim into the 12's. :P Do you have a VLSD?

This makes me think that a T3/T4 may be more than enough for what I'm planning. I would be quite content with flat 13's.. good post

[:: orion ::]

T3/T4 can support at least 400rwhp, or near 30psi on a KA...but it's good for lower boost as well.

I made 201rwhp / 209rwtq at 4.35psi (.3bar) and 224rwhp / 229rwtq at ~6psi - Both non-intercooled. Full spool by 3000rpm...

And yes, I have a '95 J30 differential (VLSD, 3.92:1 ratio)...

Later - Brian

[nlzmo400r]

nice set up you got there man, very impressive, mid to high 13s with only 8psi and 37occ injectiors aint anyhting to complain about, especially with all the 'luxury' stuff u left in (a/c, stereo and such)

[Matthew]

When you say "hacked maf" you mean using something to adjust the MAF voltage to the ecu? If so, what are you using, an s-afc?

[stunt_driver]

nice times cant wait till i get mine to run

[SingleCamSam]

Hell yeah man. Get your 60' lower and you're good for low 13's!!

[_dk]

When you say "hacked maf" you mean using something to adjust the MAF voltage to the ecu? If so, what are you using, an s-afc?

there's a good thread on it over here

[WDRacing]

you don't need too much boost for AutoX. Maybe a little more, but if you boost too much, then your turbo will never spool up, because there aren't really straightaways.

How much boost you run has absolutely nothing to do with your turbo spooling...Higher boost might increase the temperature of the charged air, therefore decreasing the effectiveness of the intercooler over a longer road course race. But thats about the only thing I can think of.

WD

[C-Kwik]

To tack on to what WD is saying, the boost curve up to the point the wastegate begins to open will always be the same.

As far as I/C effectiveness with higher boost, it is a concern, but some of it can be balanced out on higher speed road courses where airflow to the core is not as much of an issue.

[Josh]

Damn, sounds pretty good. I'm still debating KA-T/SR, but the numbers the KA puts down at low boost are always very appealing. But I'm poor, so I have plenty of time to make a decision.

How many miles are on the car, and how much money did you spend on those parts?

[MainEvent212]

get some bigger injectors and run 15 psi...that'll give u a nice 12 second 1/4....this engien is reinforced right?

i wanna get a launch limiter for drag and stuff...it looks handy and not too hard to put in...and u dont ALWAYS have to use it...u can even install it and NEVER use it if u want...and it'll add all of 2 lbs and a cool button on ur dash/steering wheel 8-)

that'll take 2 tenths off i bet, if u can launch at full boost...

[:: orion ::]

AAAaaaahhhhh! - No bigger injectors, no more boost, no 2-step limiters, etc...

I'm VERY happy with what the car can do as is. And again, I'm NOT a drag race kinda guy - I went to see what it would do, and came home happy. I know now that it's quick, and will serve me well battling the Supras and V8s on the road course (track days, not wheel-to-wheel). I was only as few ticks back before, and it was a lack of power issue. That is no longer a problem...hehe.

But to answer a couple questions:

Motor is stock - Boosted at 103k, right now it's at 106 - Had it boosted at ~6psi for 250 miles and blew the #4 piston due to too much timing ( = detonation), so I swapped in a spare piston and it's been great - +180psi compression across the board. Read here for the full story...

Hacked MAF is explained in the thread linked to above - No AFC or anything.

Later - Brian

[nlzmo400r]

stick with what you like man, if you're satisfied, cool, but i have a feelin after a while, itll wear off, and you'll want more, and also, its the size of the turbo that makes the turbo lag, not the psi

[AceInhole]

dooooode.... PM me or something. we gotta swap AIM SN's so I can hear about this stuff sooner.

That's awesome stuff. 13.6 is definitely not shabby. Get a larger exhaust and your power mods will almost be all set. :p

As for maxing out the 370's.... mine have seen 9psi without a flinch in the A/F meter. Much smaller turbo though. My plan is to run a 4bar fuel setup and see just how far they'll go. That and I gotta get rid of the MAF spacers I have.... I'm really puzzled how you got so rich without spacers.... or, I'm just running way too rich.