man, your inj. duty cycle has to be in the 90's

 

damn good run matt. before long you'll get that 11.6.

 

boost it spikes real high , but it still falls down to 22ish

 

are you logging your runs? what kind of timming are getting with those spikes? i do the same when running 110+. try for a 28 psi spike and hold about 24. non the less, those are some great times. are you planning a turbo upgrade or building around the stocker?

 

If you get all your boost leaks fixed and run a 3" TBE with testpipe and have a BOV that wont leak then you can get 33 to 34 psi spikes. That is part of the reason why he is having such a hard time coming off the line. Those high torque spikes create some serious torque off the line. After 1st gear the boost wont be that high anymore, due to the high RPM in 2nd, 3rd, and 4th gears. After 1st gear you never drop bellow 5200 RPM again.

Matt drives like a mad man and has all his boost leaks in check. That is the key. Along with good tuning.

Brian

 

Hmm, this could be my problem, too. I have been spinning all 4 like a madman, even though I don't have that much power. It's probably because I have the boost cranked up really high, and it gives me mega-torque off the line, but normal power in high rpms after I get moving...maybe I can hook better with a bit more conservative boost.

 

iam not loging , witch is dumb . I have the digimoto set up but it gives me no data on timming
I want to try to keep the stock turbo and get a 10.5 . When I dropped my shift pionts down from 7.5k to 7.2k the car was faster . So that showes me that iam lossing power above 7k . IIRC the 117.3mph run before i was shifting @7k

 

So true Brain , so true
my autometer gage only goes to 30psi so i might be running more ? and it also shows iam "holding" 24 psi to redline so it might be off also .
Alot of ppl underestimate how important it is to check for boost leaks .

 

If I was guessing, I would guess the timing is down around 3 degrees at peak torque and boost spike.

The increased MPH while shifting early could also be attributed to a further drop in RPM's when hitting the next gear. At the lower RPM's the boost will be slightly higher also. Another affect on this could be that the boost continues to drop off from 7k to 7500 RPM. On the dyno we always stop the pulls at 7000 RPM because the peak power with the stock turbo is always obtained before 7000 RPM.

The 10.5 housing will help you hold boost slightly better due to the slightly decreased backpressure before the turbine wheel. That is very good time with the 9.8 housing IMO.

Brian

 

Thanks Brain
From what you seen is the tune's (timming) different for a 10.5 vs 9.8 . I missed Al in oct and Iam sure it will be a while b4 he comes back , I want to get all my duck's in a row b4 i have another custom tune .

 

When I was on the stock turbo the car launched best when I would launch about 4500 rpm but use a light feather, you know when you got it right b/c you really feel the weight transfer and rear end squat. I would run (18" 255.35 PS2's) down as low as 16lbs in the rear to get it to hook up.

 

what clutch are you using?

 

Good point! I have had the Exedy Ceramic twin in since 25 miles. Some have complained about it holdingup but so far mine has been perfect, even with the bigger turbo and 5000 rpm feather launches. As soon as I get the clutch out it will be intersting to see how it looks.

 

Nice driving on those 11 second runs

 

You haven't seen much then, there are many boosting 34-35psi peaks.