Quarter mile times vs. engine type and power output?

[olddog]

Hotfingrs has an automatic transmission, which makes a difference. It is quite street-able, but I would say the engine is radical.

You may want to ask what type of tires are used at the track. How much power you can hook to the ground has to do with tires, and weight transfer (suspension setup is a huge factor). The average IRS is not going to hook up as much power as a ladder bar straight axle, for instance.

[Hotfingrs]

Originally Posted by olddog

Hotfingrs has an automatic transmission, which makes a difference. It is quite street-able, but I would say the engine is radical.

You may want to ask what type of tires are used at the track. How much power you can hook to the ground has to do with tires, and weight transfer (suspension setup is a huge factor). The average IRS is not going to hook up as much power as a ladder bar straight axle, for instance.

Right you are. TH350 auto with a 4000 stall speed and tranny brake.

The average IRS is not going to hook up as much power as a ladder bar straight axle, for instance.......

That's the reason I feel I could be in the 8's with a solid rear end. I run a C4 Corvette set up now and am limited by half shaft breakage.

[olddog]

Originally Posted by Hotfingrs

That's the reason I feel I could be in the 8's with a solid rear end. I run a C4 Corvette set up now and am limited by half shaft breakage.

At London I expect you have street tires on. The front tires stay on the ground.

Getting to 9's at the track, I expect you have some type of a drag slick. Are you lifting the front wheels at the track? I expect a straight axle would allow much better weight transfer to the back wheels, in addition to not breaking. I agree you could go faster.

[Hotfingrs]

Originally Posted by olddog

At London I expect you have street tires on. The front tires stay on the ground.

Getting to 9's at the track, I expect you have some type of a drag slick. Are you lifting the front wheels at the track? I expect a straight axle would allow much better weight transfer to the back wheels, in addition to not breaking. I agree you could go faster.

I run the same tires at LCS as I do at the track. M/T Street ET's Radial. 275/50/15

[olddog]

Originally Posted by Hotfingrs

I run the same tires at LCS as I do at the track. M/T Street ET's Radial. 275/50/15

Impressive. They hook good enough to break parts. Are they stickier than the Avon that get very high marks around here? How many miles can you get out of them?

[xb-60]

Originally Posted by olddog

...You may want to ask what type of tires are used at the track. How much power you can hook to the ground has to do with tires...

Yes, tyres are a significant factor. I suggested specifying whether 15" or 17" wheels
Cheers,
Glen

[olddog]

Originally Posted by xb-60

Yes, tyres are a significant factor. I suggested specifying whether 15" or 17" wheels
Cheers,
Glen

The OD of the tire is part of the gear ratio calculation.

Wheel OD doesn't matter much in a drag race. At least I cannot think of why it would.

What I was actually talking about is how sticky the tires are. Street tires are hard designed for long wear. Drag slicks are very sticky. A huge difference in traction.

Then the drag strip puts a tacky surface down. They do use different stuff for different competitions. The tack will pull your shoes off, if you don't have them tied tight. So from one track to another, even the same track on a different day, there can be quite a bit of difference.

Horse power at a dyno is corrected to what the engine would have produced at sea level at a specific temp and other weather conditions. In theory, this allows an apples to apples comparison regardless are where the dyno is located and what the weather is. The point is that no matter what the dyno said the Hp is for an engine, the elevation of the track and the weather conditions will impact the true power that the engine is making.