I ran five times today and it makes no sense.Runs are 14.82 at 94.2mph and 2.31 60ft,14.82 at 94.3 mph and 2.34 60ft,14.55 at 97.4 with 2.30 60ft,14.36 at 99.8mph with 2.31 60ft and 14.65 at 95.4 with 2.30 60ft.Street tires at 28psi.2.73 gears ,auto,
mods are 1le bellows,airfoil,tb bypass,160stat,hpp tuning out,
gms maf,g2 air induction,holley filter.New fuel filter,60,000 miles on car.Water pump failure recently but opti seems ok.idle smooth,no audible missing.No check engine lights.Car pulls to redline.
I need some help.can a cooked opti cause this much inconsistency in hp between consecutive runs.could my gms be doing this.I got it off board.I guess can try to swap back stock maf.
Car is otherwise stock ,stock exhaust.I can't win at brackets with this stuff going on.Heck I almost lost to a near stock monte carlo yesterday as ran a 14.82 and 15.0 at like 2.40 and 2.50 60fts with like 95mph.I thought maybe cause had top down and there was high winds but there is like no wind today and ran top up.

 

street tires are very inconsistent for bracket racing, and with an LT1 its easy to get them to spin, your 60 foots are really bad....anyway, did the weather change from the first run to the last one?...that one run 14.36 at 99.8 really confuses me though, you had the same 60 foot as all the other runs but you ran and trapped a lot faster/higher

 

I understand street tires can be inconsistent bu this is an auto and you can see my 60fts are very similar on all runs.All five runs were same day,same weather back to back.You can see that there is big diff in mph but virtually same 60fts and this is an auto with 2.73 and mild mods.There is zero spin past the 60ft.

I just ran trouble codes..no check light showing but got a few pending or whatever

PO 141..o2 heaters bank 1 sensor 2,PO 161 Heater bank 2 sensor 2,P0 400.egr have egr disconnected. P1111 IAT sensor..
This is kinda weird got new iat with my bellows so not sure whats up with that.Maybe new defective iat..will try old one and thing those o2 sensor problems are on back o2s the ones after the cats that don't affect the way the car runs..??

Could a non working Iat or intermittent be enough to lose this kind of hp on some runs.??

I also understand the o2 don't function at wot anyway and pretty sure those are back sensors not fronts..

 

I don't see a 60' time quicker than 2.3... Get that down and welcome to consistency. Drag Radials and keep practicing the launch. You may not be spinning past the 60' mark but where the tires actually grab is different on each pass. Despite what a few guru's may claim, you really cannot dial for tire spin you can only compensate for it.

If you actually want to do well with bracket racing you need to make the car consistent and make the driver consistent. There is no other way to consistenty do well.