Drag Racing Results - Disapointing track results with P1sc.
A couple of disapointing runs from today. The car is an 02 Z06 with an A&A P1sc at 6psi. 550rwhp/500rwtq. BFG 295's.
I was pretty disapointed that I didn't get into the 10's but it was bog or spin out there. Some times it was bog and then spin. I couldn't 60ft for any thing. It would spin bad on the shifts as well. It also turns out that my belt was slipping and I was only seeing 5psi of boost and only getting 12* of total timing. I don't know what is up with the timing. I had four runs in the 11.0's @129+. What I don't understand is how when I was NA and running only 405rwhp/385rwtq I ran consistant 11.3x's @ 123+. Granted, todays DA was 2,300ft higher than then. But I have an extra 150rwhp/115rwtq. And the curve is up all over the place. So it isn't area under the curve. WTF. I will get the belt and timing issue under control and take it back to the track.
Dyno numbers are corrected, dragstrip numbers are not..
Blowers lose boost/power at altitude and in hot weather, it will drop off just as bad as an N/A car. But 130mph is good for mid 10s, you need some better tires and have to 60 foot harder. Just have to figure it out, hope its not on a stock clutch ;)
04-30-2006, 07:48 PM
a couple things:
#1 - What I don't understand is how when I was NA and running only 405rwhp/385rwtq I ran consistant 11.3x's @ 123+. Granted, todays DA was 2,300ft higher than then.
that DA shift is good for 2-3 tenths slower, so there's a little bit there.
#2 - BFG 295's: 60ft-----1.82, 60ft------1.87 Some times it was bog and then spin. I couldn't 60ft for any thing.
That's a huge loss of time, not to mention you also brought up spinning on shifts. 129 mph is a mid 10 second car on a good run. What's the suspension set-up? Something that can handle 400 rwhp may not do so well under 550 rwhp. Get some sticky tires and watch the 60 foot (as well as your et) fall.
There's a lot of time left on the table, plus you mentioned timing, belt slipping, etc. Not a bad starting point, but racing can expose flaws that you may need to fix to make everything work together and get you a killer 1/4 time.
Good luck getting her faster!
Thanks guys. I know the belt is slipping because it hits 5lbs and then just stops. There is black powder all over the engine bay. Plus I had to use a 4.25 pulley belt on a 4.10 pulley. So that probably wasn't the best idea in the world. I need to get some better tires for sure. The suspension is totaly stock. I think the only thing you can do is HAL adjustables. There is just alot more weight on the front end now.
05-01-2006, 08:01 AM
Those times and especially mph are great considering the sixty. You have easy mid 10's with a 1.50 sixty man :)
05-01-2006, 08:30 AM
As everybody stated above ya got the right MPH but ya have to lower your sixty :devil:
Keep it up man .
05-03-2006, 10:05 AM
Damn brother you are moving, and there is no way I would think you would not be in the 10s. Stay clear from the shocks dude as several folks on the other forum have had very minimal improvements with shocks.
I think most of it is in the track. Nam does not take much and with all the extra torq you have now, it must be a bitch to hook. I say use the BFGs for the street and get some ET St radials (borrow Waynes?). Hell want to make some passes with my drag pack? I did buy 16 CCWs with skinnies and ET ST bias plies, but have not made a pass in them yet. My car is up @ CAM now putting in a new 390s. Last one made 4 passes :bang: before it ate itself. Give me a call if you want some slicks and skinnies for sunday.
Thanks for the offer Dave. I might take you up on it in a week or so. I won't be able to make it out there this weekend.
05-03-2006, 12:27 PM
You need to update your sig man :)
ET streets will shock the drivetrain a little less than the DR's. (Less likely to wheel hop)
Do you have DTE brace in the car? I would be very concerned about diff/trans breakage when you start to hook.
05-04-2006, 11:46 PM
I bet you were losing timing because of your IAT temps. Depending on how hot they were the factory parameters are set to pull 3-4 degrees of timing and maybe more. I am pretty sure it sarts pulling timing at 111 degrees +/-.
CHRISPY. No I don't have a trans brace. But I do have a hardend output shaft. That is another reason I am some what leary about the track right now.
Tim. Thanks. Some one else brought that up. Is there any way around this? Can you set the retard a little lower? The weather was actually better at the track than it was on the dyno. And it was the first run after a half hour cool down. I didn't think it would pull any timing.