60ft issues

[Pvt Parts]

Originally Posted by Mike Taylor 3601

How much tq.@ what rpm does tq.&hp peak@.
I don't know anything about your combo, but I would guess launch is too low,clutch probaly too tight, 4.88 gear too high. it's choked down.
Mike Taylor 3601

I made 758 with a 353 and a single 4, shifted at 9200 and crossed at 9300. Same rpm with more power out of a 402 sbc. He has to be at 8600 or more to make decent power and that's gonna take a 5.86 or more with a 3.11 to 3.25 transmission to run decent et's at 3500 lbs depending on the tire.

[CamCam]

Ok the tranny ratio's are 1st 306 2nd 191 3rd 133 4th 1.1. Engine peak is 690.1 @ 7200rpm peak torque 555 ft pounds at 5300rpm. Shift's are made at 7500 and go the traps at 7000.

Originally Posted by Pvt Parts

I made 758 with a 353 and a single 4, shifted at 9200 and crossed at 9300. Same rpm with more power out of a 402 sbc. He has to be at 8600 or more to make decent power and that's gonna take a 5.86 or more with a 3.11 to 3.25 transmission to run decent et's at 3500 lbs depending on the tire.

[Mike Taylor 3601]

Here's what I would try, I would take 2 step chip out use high side limiter I'll guess you have 8k already in high side, Every car I have ever had the higher rpm I leave @ the faster they go,but of course I'm talking about using common sense though,your're engine is peaking @ 7200 I would GUESS 8- 8.5K are sensible rpm.Anyway whatever chip is highside limiter I would be comfortable leave line there, if engine won't stand what high side is then chip is too high.
Then I would come out of low about 7K or just high enough not to bog,2-3 about 7.5-7.7K, 3-4 about 7.5-8 K.
When launch is raised one of two things will probaly happen if car is wheel standing now it may calm that some because where you are launching it could be dead hooking,or it may blow tires off if it does,back clutch off,btw keep backing off till it slips in high gear,you'll know because frontend will start bouncing up and down like you're whomping the gas.
It could be hard to get this car working with that gear 4.88 w 3.06 is pretty tall low(14.93)
as example you probaly run 5.38 which would lower 1st to 16.46.which would help,easier on clutch & trans,but more pressure on axles.
Or you may go fastest it's been.
I would start air gap @.050 if you have'nt checked set this .050 is baseline wider hits harder closer hits softer,if shifting w clutch .050 is probaly as tight as you want to go.
This is what I would try might help might hurt but there's only one way to find out.
You could probaly gear for 7800-8000 @trap also(5.38)
Mike Taylor 3601