SS/CS Start line Ratios
 

Hi,

Aussie Super stock question, where our class rules are closely in line with NHRA SS/CS, hence the title. We run a Proflite 3 speed behind a max effort, small cube, high rpm OEM iron headed wedge motor. Converter stall at just a bit over 8000rpm. Car weight is approx 3300lbs. After a reasonable break from racing we decided to change our first gear ratio, we're currently at 2.51 with a 6.0 rear gear, the car seems to launch harder with this gear but as a result the gear shifts are happening sooner and the run home in top gear (1/4 mile) is stretched, which seems to not be helping the e.t at the stripe. Unfortunately, the original ratios in the box were misplaced, but we're lead to believe they were around a 2.2 first. Hoping to pick a few a brains on which direction we should head with our ratio and if we should be aiming to head back to a numerically lower ratio? Thanks in advance for the help.

Re: SS/CS Start line Ratios
 

You need to talk to Ashton Hudson. He had the fastest CS car before he switched to comp. I’ll tell him about your question.

-Ed

Re: SS/CS Start line Ratios
 

Back when we ran that combination, we had a Pro-Trans with a 2.45/1.51 (E-2). I don't know if I was as fast as Ashton, but we made a few good runs over the years.

Our program made peak power around 9400 and if I'm not mistaken we had a converter stall around 8400. When we were in decent air we would cross at 10,200 if we were trying to run fast.

Best of luck with your combo!
Mike

Re: SS/CS Start line Ratios
 

Thanks I'd really appreciate his insight to the question.

Re: SS/CS Start line Ratios
 

Hey Mike,

Thanks for commenting, I've followed your car in the past and was certainly impressed with the results you achieved in ss/cs. The rpm at peak power of our combo is close to yours, out of interest what were you aiming for on the shift points? We might be a little conservative with ours from first impressions.

Thanks for the help.

Re: SS/CS Start line Ratios
 

The 2.45-1.45 is a real good ratio.
The % drop between gears is good.
I heard rumors that was what the fastest CS car had in it.
If you want to take a little low gear and a tiny bit of second gear out of it try putting a "F" in place of the "E". Makes it a 2.41/1.48
That is what is so nice about the pro flites.
Watch the fast comp guys. A lot are in High at or before the 330....JS

Re: SS/CS Start line Ratios
 

Thanks for the reply, it seems our current Ratios are in the ball park then to what you guys are running in SS/CS which is good to hear. We did have to send our converter off for repair sometime ago and ever since then it has not been the same. We have a newer billet style on the way to test so the tired converter may prove the reason why the newer Ratios hadn't performed as expected.

Re: SS/CS Start line Ratios
 

e2 = 2.45 1.51 f2 = 2.36 1.48 e6 = 2.51 1.51

Re: SS/CS Start line Ratios
 

Are you guys still running solid lifters in lieu of roller lifters?
By the way, the right converter is a game changer for performance.

Re: SS/CS Start line Ratios
 

Yes solid lifters are still mandated with a maximum of .904 lifter size. Solid lifter makes them a little trickier to peak at the same RPMS as the SS/CS combos but they get close.