starting line gear ratio?

[Rory McNeil]

What is the intended combination, and combination? With my old M/S 85 5.0 Mustang, I ran a 3.19 low gear in the Jerico, and with 4.88 gears, that made for a 15.56 SLR, and with 5.13, a 16.36 SLR. That was with 29-29 1/2" tall tires. I would have liked to have tried a bit lower rear axle ratio, but for the Ford 8.8, there was nothing between 5.13 and 5.7. Unless it is a really lightweight car with lots of power, and borderline ability to hook up, I can`t imagine a 11.25 SLR would be anywhere close to ideal. My SB Ford 4 speed G Force bracket car also has a 16.36 SLR,albeit with 31" tall tires, plus an additional 25 MPH, but looking to add a bit more rear gear ratio, or shorter tires to give another 1 or 2 hundred RPM at the 1/4 mile finish line. Same with my old hot rod type cruiser, currently has a 2.78 low Toploader with 3.50 rear and 28" tall tires, a 9.73 SLR, and I am barely hitting 4th gear at the finish line. Plus at over 4000 pounds, the organic street style clutch isn`t very happy. Hopefully the 4.33 gears (12.03 SLR) will help performance, and clutch life, at the track. And if I was to decide to switch to a modern overdrive 5 speed, I would be looking for a low gear in the 2.8 to 3.1 range.

[Stan Weiss]

This is what my software suggests.


Stan

[Mike Pearson]

Back when I ran a stick in my car the SLR was about 19 to 1. With the same engine combo and a glide the SLR is 12 to 1. The engine is much better now and the car is about a second faster than it was with the stick.

[Bench Racer]

For what it’s worth, my brother ran a 58 Chevy wagon back in the 80’s in IHRA Super Stock (basically a econo modified engine). It was a 283 that weighed 3839 and ran a turbo 350 with a 6:83 Dana and 29 and 30 inch tires for the 1/8 and 1/4. The torque converter was pretty a good piece back then but could likely have been ran on the street now. The car held the IHRA class record before he bought it and did until he sold it. I don’t remember any 60’ numbers but the car got quicker after putting In a 2:75 low gear. Don Jackson

[Bernhard]

How does engine cubic inch and an engine's ability to RPM factor into the SLR?

[Mike Rietow]

I caught a little NHRA Stock qualifying highlights today from Topeka. I don't know much about this class really as far how elaborate the engines are allowed to be, or how much they have to weigh, but this car runs about like my n/a 23 degree sbc on 10" tire 69Nova.

What SLR do these class cars typically run? What transmission and how many rpm's do they typically cross? It was a current model Camaro, is it limited to an LS? I think the announcer said 409cid. Just curious, run pretty good seemed like.

[6130]

Originally Posted by Mike Rietow

I caught a little NHRA Stock qualifying highlights today from Topeka. I don't know much about this class really as far how elaborate the engines are allowed to be, or how much they have to weigh, but this car runs about like my n/a 23 degree sbc on 10" tire 69Nova.

What SLR do these class cars typically run? What transmission and how many rpm's do they typically cross? It was a current model Camaro, is it limited to an LS? I think the announcer said 409cid. Just curious, run pretty good seemed like.

An FS/C car is not a traditional Stock Eliminator race car, it's a factory race car with no VIN. The factory race cars come with Ford 9" rear ends and engine combinations that may not be available in regular production-based cars.

A better comparison with a traditional production-based Stock Eliminator race car, might be a '99-'02 LS 346 V8 Camaro A/SA car. The current national record in A/SA is 9.65 at 136.3 mph.

A car like that would have a stock throttle body, stock intake manifold, stock heads with an NHRA-legal valve job, stock bore (plus up to .040"), stock stroke, stock compression ratio pistons, stock valve lift, stock rocker arm ratio, and so on, with a "metric" TH200 3-speed automatic transmission with no trans brake, an 8" converter, and 9x30" tubeless radial slicks.