popping, low o2???

[hotgnrod]

Went to the track today. First pass was a 12.48 @ 99mph. When I was at approx. the 1000' mark the car popped. O2's dropped to .421(DS) . Thought maybe it was FP related but it was at 50psi. line off. Boost was at 21.5. I know you all probably need other #'s but my lap top is at the shop. Any ideas??
Thanks.

Rod


P.S. my combo....stock block, heads,tb. Te44, 3" DP, 3" single exhaust (my design), Dutt neck intercooler, XP fuel pump, RA 93 chip, volt booster, hot wired f. pump, Tires...ET Drags 26"x 8"

 

[Chuck Leeper]

Injectors?

Rod, I see no mention of upgraded injectors in the sig. I also see no mention of race gas being used.
Assuming the answer to both the above is "no":
A. 20+ # of boost is an area for either alky or race gas to be used.
B. The 50# of FP, along w/ the TE-44, is a good recommendation for some 36#,[minimum IMO]injectors, and a FP in the low 40's.
C. The Red's 93 chip is a street chip, and as such, may not have the reduced timing and proper fuel map for hi boost operation.

My take on the cause: Most likely a combination of low octane and insufficient injector size,one or both causing the lean backfire.
B4 you blow the heads off, I'd make the following changes...[Or turn the boost down!!.. ]
1. Get a race chip.
2. Get a set of 42.5# injectors.
3. Get some Xylene or toluene for a octane boost.
4. Buy some race gas.
5. Put a SMC alky kit on.
6. Check FP at WOT after the combo is re-tuned.

If I was going to drive the car on the street most of the time, I'd do items 1,2,5,6. And tune, tune, tune!!

GOOD LUCK!!

 

[hotgnrod]

Sorry, I forgot...Bluetops, 114oct., and I have a RA108 chip, but last time at the track I was getting major kr with it, but no popping. I thought maybe it had too much timing.

Thanks.
Rod