traction at top end

I have a altered with a 540 brad fat head with a 206d at 92% with a lencodrive 3 speed 28% and 31%, with a Goodyear 36" tire with a 4.30 gear .Looking at the computer at the last 300 ' of the track the driveshaft rpm looks like a saw blade 200 rpm up and down,have pulled 5 degrees of timing when shifted into third and no help,added more wing nothing air presure on tires from 6.3 to 7 psi. We run on tracks that are marginalat best,but this at different tracks.
Car runs 6.3 at 218 mph 1/8 is 4.092 at 175

 

How old are the rear tires?

 

Replaced the rear tires 8 months ago

 

Is it slowing you down or causing you issues, or just an anomaly that you notice ?.......

 

Were losing traction on top end and the car gets lose,the driver says that he can also fell it .

 

What’s the wheelbase on that thing? Am I understanding correctly that this is happening at every track you run at and in each lane?

 

its a 125" wheel base and yes I hane a wing on the car.

 

Mike we gone from 4 to 8 degrees and no difference we also add a 1" wicker to the rear of wing,and we started with a 1/2" wicker,we also changed the spill plates with no change.
I'm know that if you add to much wing it actes like a brake and doesn't help.
we also moved the wing farther behind the car to give the wing a little more leveage .

 

ok the wing is solid mounted and we used areo tubing the wing is 48" by 18.5 ,we also moved it higher and back to to get it in clean air ,the wing is 2' higher than the altered body a 32 batan body we also run tubes and liners the air pressure on the tubes is 55 lbs I don't know if that make any difference

 

You never answered the second part of my question. Does it do this at multiple tracks and I. each lane at each tracks? How’s the track surface at the problem area? The reason I ask is if you overlay runs from two different tracks and they are the same or really similar it may indicate a problem with the car and or wing.

Are you cranking wing angle in with a digital protractor? They can be confusing at times. Are you certain your cranking angle in it and not out of it? A poorly designed wing can also create lift.

 

Our tracks are marginal at best and it does it at all tracks some worse than others ,they don't seen to prep the tracks past 1/8 mile
We also put a stright edge on the top of the wing ,but not on the wicker and yes we do use a digital level ,but I also have one with a bubbleand they match.
we're going to New Mexico on the 4 we will try less air in front tires and more wing and see what happens.
Thank for all the input
Hydrotherapy
P/S If this was a boat I could fix it, just to make you laugh.

 

In the old days the Hoosier tires had a flatter footprint at speed than the Good Years. Good Years look like a Krispy Kreme glazed donut at the finish line while the Hoosiers stay pretty square with a flatter footprint. More rubber on the ground wouldn't hurt.

Demke on Hoosiers:



Another on Hoosiers:



Good Years. More round and lest rubber on the ground:

 

very interesting does hoosier make a 36" tire