JDSfastGN
Well-Known Member
- Joined
- Jun 16, 2001
So I just got back from Noble racing in the Buick vs Ford shootout. I won my race but the car was pretty off. I recently upgraded to K-Motion K-750 valve springs setup at 1.65. The car now pulls clean to 6000 without much drama. I was really expecting a 128-130 pass out of it but was sadly mistaken. Here are my slips and power logger runs.
1st run was 21-22 psi and I launched at 5 psi off the transbrake. 23/21 timing, single nozzle at 7. The knock is false and seems inconsistent. The Commanded A/f ratio was 10.5 1/2 and 10.4 3/4
2nd pass was 23-24 psi with no other changes but less knock (picked up in the 1/8th but lost in the 1/4)
3rd pass I bumped the boost to 25-26 and still kept the a/f at 10.5-10.4. By this time Ive realized that right off the trans-brake the car is either blowing through the low clutches are instantly shifting into 2nd killing my 60s. This sucks and I will fix it but it still isn't picking up mph from the 1/8th the the 1/4.
This pass I leaned it out to 10.7:1 and made no other changes. I saw a big jump in mph and thought i was on the right track.
The final pass the powerlogger didn't record but there was .5 knock and no changes.
My concerns are..... the car has been 127-128 before in similar weather at the same track. Losing most of 1st gear obviously hurt it a bit but it should still be picking up 25-26 mph out the back door. Converter efficiency seems to be i the 14-16% range, which isn't great, but with 3.23s and 28" tall tires its tough to couple at 5200 rpm I guess? Any thoughts or ideas? Its an .85 housing on the turbo and I honestly don't remember if I have even run it with that housing or not. No smoke or other issues. They were brand new autolite 23s gapped at .030. I have a bad tendency of not putting my foot all the way in it until mid 2nd gear so Im sure some will notice that. Does anybody see anything obvious or should I start with a leakdown test?
1st run was 21-22 psi and I launched at 5 psi off the transbrake. 23/21 timing, single nozzle at 7. The knock is false and seems inconsistent. The Commanded A/f ratio was 10.5 1/2 and 10.4 3/4
2nd pass was 23-24 psi with no other changes but less knock (picked up in the 1/8th but lost in the 1/4)
3rd pass I bumped the boost to 25-26 and still kept the a/f at 10.5-10.4. By this time Ive realized that right off the trans-brake the car is either blowing through the low clutches are instantly shifting into 2nd killing my 60s. This sucks and I will fix it but it still isn't picking up mph from the 1/8th the the 1/4.
This pass I leaned it out to 10.7:1 and made no other changes. I saw a big jump in mph and thought i was on the right track.
The final pass the powerlogger didn't record but there was .5 knock and no changes.
My concerns are..... the car has been 127-128 before in similar weather at the same track. Losing most of 1st gear obviously hurt it a bit but it should still be picking up 25-26 mph out the back door. Converter efficiency seems to be i the 14-16% range, which isn't great, but with 3.23s and 28" tall tires its tough to couple at 5200 rpm I guess? Any thoughts or ideas? Its an .85 housing on the turbo and I honestly don't remember if I have even run it with that housing or not. No smoke or other issues. They were brand new autolite 23s gapped at .030. I have a bad tendency of not putting my foot all the way in it until mid 2nd gear so Im sure some will notice that. Does anybody see anything obvious or should I start with a leakdown test?
