Re: starting line gear ratio?
 

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

Re: starting line gear ratio?
 

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.


https://i.imgur.com/LUQbPl3.png

Re: starting line gear ratio?
 

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.

Re: starting line gear ratio?
 

here's a more detailed chart borrowed from Cale Aransons Black Magic clutch website ..........lots of useful information there.

http://www.blackmagicclutches.com/index.html

Re: starting line gear ratio?
 

Very cool, thanks

I gotta find a way to watch/follow these cars more

Re: starting line gear ratio?
 

Rod: 350HP and 3600LB = 12.20 should be attainable.

Our Aspen Wagon NOP Stocker with 318 that put out actual
340 HP and weighed 3600 plus held the record @ 12.0 over
ten years ago.and ran 11.70 to 11.80 when needed.

It is an Auto so not comparable on ratios but shows what can be done on that HP/Weight.2.75 Low and 5:13 gear at Sea Level. 14.11 ratio and I think that stick would need a bunch more without a torque converter. 9.0x30 Radials (92.5 Cir.)

Re: starting line gear ratio?
 

While HP and weight are very important you cannot leave out tire size when talking about SLR.


Stan

Re: starting line gear ratio?
 

Stan,
I think I said" If traction is unlimited" or did I say available... ??

Re: starting line gear ratio?
 

Adger,
Size was to general a word to have used, I should have said Diameter.


Stan

Re: starting line gear ratio?
 

You get my vote for "Clueless Post Of The Year".....