Wont hurt anything to start at 3,200 rpm on the launch and go up by 200 rpm each launch to see where it is happiest... This gives it a run at the convertor which it may like?

If I try to launch it at 4,000 rpm it hits too hard and drives the rims down then when it rebounds, it spins... I need to have my Strange double adjustables, re-valved tighter.

I am done for the year up here in the frozen North. Are you able to get out again and keep testing??

Arnie

BIR Is open this weekend. Rock Falls in Wis goes late into oct i think. So ixwant to get to BIR at least.
Sounds like you need a lot more shock control in back on the hit, or less leverage. Ladderbars?

Look forward to hearing the next results. As Arnie says launch RPM is something to play with and is combo dependent. For instance we launch the heads up car from 39-4200 and that converter flashes to 8800. A lot of factors go into that for sure but it is something to try most definitely. It may adversely affect your reaction times dropping it as well. Just something to be aware of. I woudl start stiffening up those rear shcoks on extension for sure. Try to get some video closer to the car if possible as well.

[/quote]
Sounds like my idea of more launch rpm may go too high. Mine seemed to hook fine and carried the front a long way but 60 ft was 1.275.
At 4000rpm. Maybe i should start at 4000 and go lower. [/quote]

I am about to start experimenting with this. A lot of variables go into what a car likes to 2 step RPM I think. Some like a run at the converter stall and some don't. Converter setup and cam have a lot to do with it too. All my setups seem to get to the point that ET doesn't change but the RT does as you go higher, as long as it hooks, and when you drop RPM you get to the point the cam isnt happy.

Gearing also plays a big roll, trans and rear gearing. If you have a glide they usually dont like having the RPM dropped down so far, why you hear S/G cars at or above 6000. The more mulriplication you have at the hit the more tolerant they are of lowering launch RPM. The heads up car had a 2.24 first gear and 5.14 rear gear and a 29.5" tire, alot of SLR.

I run a Torqueflite and alcohol injection. The combo can launch effectively from idle to 5200 with big tires. But reaction times really slow a lot as rpm comes down i notice. Since I race off a three bulb tree it doesn't matter other than slowing the 60 ft.

For what it's worth my car is foot brake only. Geared 2.45, 4.30, 10.5x31. Leave RPM is how I vary R/T. Usually 2800-3200. This will most often put the R/T average in the .02x range. 60ft depends on how much ballast, track prep, and how good the air is. Sometimes air conditions and weight seem to vary 60ft more than track conditions. Slowed to 9.25 it'll 60ft 1.29-1.32 depending on ballast. Car can weigh from 3325-3500. Flat out in good air 1.25-1.26. My bet is good air is giving it some wheel speed. Pulled back it dead hooks.
Doug