SS/CS Start line Ratios

[SuperStock172]

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.

[Ed Carpenter]

Originally Posted by SuperStock172

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.

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

[Mike Mans]

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

[SuperStock172]

Originally Posted by Ed Carpenter

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

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

[SuperStock172]

Originally Posted by Mike Mans

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

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.

[Adger Smith]

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

[SuperStock172]

Originally Posted by Adger Smith

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

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.

[Hacksaw]

Originally Posted by adger smith

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

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

[SSDiv6]

Originally Posted by SuperStock172

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.

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

[SuperStock172]

Originally Posted by SSDiv6

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

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.