Powder flat after 6000 rpm

[micfan33]

I am having trouble with tuning my new heads. Just installed lightly used 225 AFRs, milled 30 to 57cc, with Brian Tooly 650 springs. Running 100 octane. Motor is TSP 408 LQ9 with Texas Giant Cam (248/254, .615'/.622', with 114 LSA), Fast 92, NW 92, 100 MAF, Racetronix 42s, 1-78" LT, 3" True Duals. I have plat NOS system but am not using on these runs.

I really don't think it's valve float, but the motor stops pulling after ~6k. Any ideas? Help? Is it something in the injector parameters?

Thanks.

[5FDP]

Ideally you really should tell the computer what size engine this is running as it bases the calculations off that. You still have it as a 5.7 factory size. Fueling is kinda off under heavy load. The MAF isn't smooth and you'd benefit from going to a speed density enhanced operating system to remove the secondary VE.

Is stoich on 100 octane 13.70?

Is it the seat of pants feel or is a dyno showing power just stopping or dropping off after 6,000rpm?

[micfan33]

Thanks for the feedback! You're right. I was running 260 GT Plus with is 13.7 vs 14.2 with the SS 100. I'll change the motor size.

Yeah its seat of the pants feel on the track.

[dermotw]

what sort of air intake before the MAF? Any kind of filter in use? Airflow management?
Airflow/maf stops climbing up there above 6k. And as said, the maf curve needs to be really smooth when viewed in hpt, in fact its better to use something like excel to look at it, you can't even see small blips/variations in hpt...