lag in initial drive shaft speed

We have a lenco drive 6.50 bracket car in Australia. I am noticing a lag of .25 to .3 from when the transbrake is released unitl we are seeing a rise in driveshaft speed. Is this normal or should we be looking for issues inside the gearbox/transbrake. The transbrake clutches show extra signs of premature wear.

The car preforms well to the 60ft (.990-1.05)leaving from idle 1800rpm and the convertor flairs and locks up how it needs to.
2400lb funnycar
540inch a481x
16/71 33 over
lenco drive
chance convertor.


Thanks

Clarky

 

Hey Clarky...

Mine was the same but only 2 magnets in the ring. I belive a 4 or 8 magnet job will see it react quicker

Cheers Pete

 

Starting line

You should look at the G-meter when the car moves... I have a 12v signal sensor on the T/B to see when released... We have 8 magnets and see a lag.

 

thanks flowedge i was thinking the same about the leaving from idle, we dont see any movement in shaft speed until 5500rpm, i reckon the car would smoke the tyres with that sort of launch rpm.

Thanks everyone else for the advice.

 

for you guys running a converter do you see any "dips" in your driveshaft speed say within the frist 30 feet of the run?ours has 2,have heard you can't get them out with a converter,some have said its the tire stoping the converter.anyone else seen this?

 

Dips in driveshaft data is the tire stopping on the track and removing them is a combination of power, retard, tire pressure and suspension and that there is how you go fast.