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DRR Top Comp |
The amount of deformation in a bias tire is the variable in regards to how much faster a radial will be. So if your suspension works with 20 psi with a bias tire, you may not see a tenth. It's the deformation which causes the energy loss with a bias tire - higher rolling resistance. I suggested a radial to DLR for the reason, there's a car local similar sbc/weight car that picked up a tenth. | |||
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DRR Top Comp |
http://classracer.com/classfor...d.php?t=74517&page=2 I've never run radials on my Nova BUT I've seen several reports of picking up a tenth and seen it first hand. It's the difference in deformation depending on how much air you run in your bias tire which determines how much you pick up with a radial. Typically big bias slicks like DLR run, don't have much air in order to make em work, which leads to high energy losses - higher rolling resistance. . This message has been edited. Last edited by: Mike Rietow, | |||
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DRR Trophy |
Is the usual number around 2* advanced from what the cam card says to account for the belt stretch? Nick Craig 1971 Camaro Split Bumper 376ci LS3 | |||
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DRR Top Comp |
Max effort N/A would be around 730 670 270 280 106 installed on a 102 3500 lbs With a dominator 14.5:1 compression 750hp | |||
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DRR Elite |
desk top dyno shyt right rhere. | |||
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DRR Top Comp |
Home brew Engine and Transmission | |||
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DRR S/Pro |
1 to 2 degrees so ya | |||
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DRR S/Pro |
14.5 to 1 is a max effort! | |||
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DRR Elite |
exactly! | |||
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DRR Elite |
I see trying different cam timing and doing lash loops as just part of the tuning process. If you don't check, you don't know what you have missed. Sometimes also, when you discover that a cam runs better advanced or retarded, or likes more or less lash than the card calls for, it gives you clues about where the cam is weak for your application. And also where improvements can be made. If you like to get every bit of performance out of what you have, trying different setups with your cam is no different than putting different jets in the brand new carb you are trying to dial in. Foxtrot Juliet Bravo | |||
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DRR Sportsman |
Absolutely picked up 0.15 going from a bias ply to a drag radial right here. 3200 lbs, 049 oval ports, 598, injected on methanol, 1.80 PG, 4.30 gear, cal tracs and split mono's. 14x31x15 goodyear vs. 29.5x10.5x15 Mickey PBR. 6.05 vs. 5.90 back to back passes. Swapped tires and rims after the first shot on bias plys MPH was the same. That car hit the tire pretty hard tho, was awesome on all sorts of tracks until we stepped up the power level to the 1000 hp range. Then it started trying to ride the bumper most days and was a little harder to manage and bracket race. | |||
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DRR Top Comp |
That's running good. We've seen .15 down in Florida as well, bigger radial tire sizes especially. Nice pickup in et. | |||
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DRR Trophy |
So it sounds like I need less LSA and less duration. So this would make it more aggressive on the bottom end? Another question I would have is. Would doing the raise trap rpm? It don't pull the big end maybe 6700 range. | |||
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DRR Elite |
All your ET n/a is by the 330’ cone and it starts with how quickly you 60 foot. | |||
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DRR Top Comp |
https://youtu.be/5Fdhx6u-d5o If I put radials on the Ripper it would go sub 1.20 60 ft.n/a home brew sbc | |||
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DRR Trophy |
All your ET n/a is by the 330’ cone and it starts with how you 60 foot. I'm starting to see the light. I'm just trying to learn a few things here. I will admit I never knew much about camshafts but I'm always willing to learn. | |||
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DRR Trophy |
If your 1.27 now, I can't see you dropping that much just with a tire change. I've seen cars drop a tenth going to radials, but they were 11 second cars that were running tubed bias plys, and it was a tenth over 1/4 mile. | |||
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DRR Top Comp |
I had one guy I talked camshafts 25-30 years from when he was at Comp Cams to Lunati to Bullet Cams named Richard Woods, he's putting out fires for an automotive parts manufacture no longer in the high performance industry, however he has turned us on to a new contact at Bullet Cams named Kirk, super nice guy. Talk with Kirk. | |||
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DRR Trophy |
Top I wouldn't say I'm un happy. It is a very consistent set up. But if I could get some more et and not sacrifice consistency I would love to do that. I have always felt there is some left in this combination. | |||
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DRR Trophy |
Mike I believe I have dealt with Kirk before. When I had my 582 and my dragster. They was good to deal with. Never understood why they always wanted to run a lot of lift. The lift was way higher than any other places that recommended a cam for it. But like I said I don't know a lot about cams. | |||
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