Here's the deal. My car has about 3k miles on the kit so far. I was able to squeeze a run in at the track but wasn't that impressed. I would like to know what you guys are running and at what psi. Also let me know if you're on street tires or other. I'm looking mainly for full interior w/ street tire runs if possible. Under normal driving condition the cars feels really strong but at the track it felt like it died off on the top end. I'm just looking to ballpark my car before I take it to the dyno.

Just for reference. I rolled my car out of the box from idle as not to spin first & second. I was on fairly worn 205/50-15 kumho tires.
RT: .866
60': 2.501
330': 6.351
1/8: 9.464
MPH: 81.12
1000': 12.094
1/4: 14.326
MPH: 101.07
This was @ ~14psi. My shift points were also off I believe.

yeah, thats pretty damned slow.

my T25 at 5.5 psi turned a 13.9@101.

i have no idea what could be wrong with your car, was this on pump gas? cams?

Yeah pump gas, stock cams, and Greddy SP exhaust (5 yrs)

uhhh, yeah, DONT DO THAT!

10 psi is the unofficial pump gas limit, and that would be with a 3" exhaust. with that tiny ass GReddy, i would say 10 psi is the ABSOLUTE max for pump gas. i would say that maybe, with 3" exhaust, on a cold cold night on a big 0.82 A/R 15 psi can be done, but proceed at your own risk.

ever hear a sound from your engine that sounds like a whole bunch of marbles hitting glass at low speed when you are flooring it? your car is probably back out a lot of timing because of backpressure.

try a run at 10 psi (assuming your motor is still kicking) and see if it improves. also, do a compression check to make sure your rings or exhaust valves arent already toast. also, check your plugs for missing electrodes, etc.

What type of cam? whats your timing at? sounds slow. SHould be around a high 13 due to no traction and around 105-110mph.

stock cams, i think the ECU is backing out timing due to too much knock activity, that and the 2" GReddy SP isnt helping. 14 psi on pump with that exhaust isnt a very good combo.

I ran 13.6@109. Potenza s-03 tires, and the only thing I took out was the spare and some tools. This was at essentially 10psi (have the boost controller set at 12psi... but like i thought, lost pressure at the top. Dropped to 11psi at 5k and down to 10psi at 6k rpms).

This is with a t25, s3 cams, and the small greddy exhaust. I think mine is around 6 years old :) anywayz, what size injectors, etc. are you running?

If you're running 370cc injectors at the stock 3 bar fuel pressure, and the stock maf, 14psi will max out both of those which is probably why you're losing out on the top end. Maxing out both the injectors and maf is probably making it run lean, which leads to knock, which the ecu hopefully catches and reduces the timing which costs power.

Khiem

opps, wrong button.

I thought FMAX Stage II was 50lb'ers at 4 bar? Or is that just an option? Will a small exhaust cause that much timing retard?
vrux can you list your fuel setup?

The engine has never made any noise. The inj. are 50 lb MSD. @ 3 bar and have Cobra MAF as per STAGE 2. The Greddy is 2.36" to clarify not 2". I haven't gotten around to get the 3" exhaust yet. I was planning on doing a compression check as a precaution before I proceed. Also, plugs are in good shape. I'm gonna set boost at 10psi and see how the car reacts a the top end.

Just a question, do you turbo cars pull all the way to redline?

hazar_SER,

missed your post sorry.

50lb @ 3bar, Cobra MAF, 300ZXTT fuel pump, and JWT fuel rail.

Controlled by JWT ECU

hmm.... you should have plenty of fuel. Might just be the stock cams killing your top end. But I'd be surprised that it killed it that much. and considering I'm running the same exhaust (and a bad cat)... I dunno!

I would check your TPS and timing. I would get a 3" exhaust put on whenever you get a chance. You should be around the 110+ mark with that much boost with an Fmax stage 2 setup!

MarkSR20,

I had the timing and tps set before I did the install. Base timing was set to 15 deg. I was planning on picking up a 3" catback and 3" cat to replace my burnt out one. I was skeptical to throw more money into the car without identifing the problem.

Since your going to be at a track, lower the boost to 10lbs and drop your exhaust, that should help.

mufflers were required

Originally posted by vrux
MarkSR20,

I had the timing and tps set before I did the install. Base timing was set to 15 deg. I was planning on picking up a 3" catback and 3" cat to replace my burnt out one. I was skeptical to throw more money into the car without identifing the problem.

youre running with a messed up cat? or is it catless now?

detonation is VERY hard to hear, the best way to hear it is to roll up the windows. even a minor exhaust leak can mask the sound of detonation. whenever your car knocks, it will back timing out up to 5 degrees, but with the MSDs, your knock sensor should be disabled, so that wont cause that.

i would still stay away from greater than 10 psi on pump, especially on the smaller exhaust.

Thats what i did at 14 psi. But i was on a bad clutch and it was my first mime at th track on street tires. 14.1 @ 106. No traction in first, it took like a second to get into second gear, due to the clutch. And i was having ignition problems. So all in all for my first time i wasent disappointed. There is alot to learn about drag racing!

yeah, but your MPH is much higher than his, though still a little low.

Jackson,
This is not my first time at the track, just with the turbo. In third and fourth gear under WOT @ ~6k on the car feels flat. It pulls up to that point.

Everyone,
I'm definately going to do a compression check this week.
I'm concerned their may be some issues with the engine. What are my options for diagnosing a problem?
1. Consult (pain in the ass)
2. Dyno run
3. Some kind of data logger

The bottom line is I have to make a comitment to getting this car to run perfectly at any cost or I will have to part with it always wondering what could have been.