Super gas/comp/Street forums?

[Keith 944]

Originally Posted by Superstreet29

I do know if you are low on power dropping that cruise rpm gets unpredictable. And if you make good power getting it too high puts too many numbers in the timer. It’s a test and tune fine tuning point til you find what works on your car. I’ve been on at .001 with a Maxspeed, on at .10 same carb...you just have to have enough power to do it that soon or it will know the breath out of it and you’ll get a dip. I had a big motor combo that liked .001 and shift at .020.at 4300 and it worked well. Tried it with a smaller motor and it was a no go

^^^^ This
Every engine/combo is different. The key? Test, Test, and Test some more. The combo will show you what it likes, not the other way around...

[Shake & Bake]

Lenny5160,
When running 9.90 I go on the stop at 0.001 and coast at 4150. I come off the stop in high gear. My 1/8 mile is 7.02 @ 131.83 compared to 1/8 mile WOT 4.66 @ 150.00


I lose 18-19 mph.

[Lenny5160]

Originally Posted by nomad

No, we go on cruise at the same time, just at a lower RPM. Because we run a lower RPM we don't have to be on the stop as long. Like anything else it depends on what the car likes. We've run it on 540 and 565 engines. I'm not sure it would work well on a small block.

If two identical cars have the same cruise RPM, the one that goes on the stop quicker should have more top end MPH.

If two identical cars go on the stop at the exact same time, the one with the lower cruise RPM should have more top end MPH.

My personal guidelines are:

1. The 'stop on' time should be just high enough for the car to cut a light.

2. The cruise RPM should be set so that the car can at least clear the 60' beam while on the stop every pass in any weather conditions.

There will be other things to consider in each case. Some cars may need to be WOT a little longer at the start to work the chassis properly. Some cars may come off the stop cleaner with a little higher 'stop on' RPM than absolutely necessary.

I run oddball combinations in both of my cars, so I can't always use these principles but I use one of them in each car.