Rear gear question - Page 2

CMcAllister · 10-06-2024, 06:30 PM

My handy dream wheel says 133 is 10 flat horse power, 600 - 620 HP or so.

1.45 60' isn't hateful. Probably has mid 1.30 in it anyhow. A 3 speed, with the extra SLR should make it 60' a little better. A lightweight 3 speed would be even better.

Depends on your goals. More rear gear, as was said, will help. Agree with a 5800 converter. Beyond that, if it's consistency on marginal tracks, you're probably best with that low gear. Want to go fast, need the low gear a 3 speed would offer. And more tire.

Adger Smith · 10-06-2024, 07:16 PM

Need a neutral or negative converter to get it to pull off line & the gear change.
5800 stall OK, but there is more to the converter than stall speed.
I agree with tire and rear gear change.
1.96 low might wake it up too, but shift it at higher RPM with a lower low gear PG.
You are carrying quite a lot of weight for a 7.38 starting line ratio...2.52 low gear 3 speed puts the SLR at around 10.33. With the right 3 speed converter it would pick up a bunch. Probably on the + side of .15..

Adger Smith · 10-06-2024, 07:31 PM

oops!

Lenny5160_v2 · 10-07-2024, 11:45 AM

I have to think the converter is real tight.

My Nova is 3600#, 1.80 glide, 4.10 gear, 28" tire and has 660 HP. I can't go 133; 128 is about the best it'll do but it's usually a 1.40 60'.

So, same running gear setup but heavier and less power.

1320racer · 10-07-2024, 12:25 PM

Quote:

Originally Posted by Lenny5160_v2

I have to think the converter is real tight.

or heads are too big

CMcAllister · 10-07-2024, 07:29 PM

Quote:

Originally Posted by 1320racer

or heads are too big

or cam

Stan Weiss · 10-07-2024, 07:45 PM

3400# car, 28" tire, 739 HP, Auto trans

I would want to see somewhere around an 11.5 SLR

NOTE this is ONLY a recommendation for what might be a good STARTING POINT

Stan

L.Fite · 10-07-2024, 09:57 PM

5.14 and a 3 speed might get him there...

Stan Weiss · 10-08-2024, 08:04 AM

A 2.74:1 first gear 3 speed and his present 4.1:1 would give him a 11.234 SLR. Not a bad starting point.

Stan

1320racer · 10-08-2024, 09:07 AM

SLR is internet forum bs like dynamic compression ratio.

My SLR is 8.748, what am I doing wrong?

Meanwhile, I have a data recorder, download every pass and KNOW at what RPM exactly my converter flashes to and falls back to on the gear change as well what RPM I'm shifting at and crossing the stripe at in addition to all the other data I record and plot every pass.

10-06-2024, 06:30 PM	#11
CMcAllister Senior Member Join Date: Sep 2006 Location: Fulton County, PA Posts: 614 Likes: 16 Liked 920 Times in 259 Posts	Re: Rear gear question My handy dream wheel says 133 is 10 flat horse power, 600 - 620 HP or so. 1.45 60' isn't hateful. Probably has mid 1.30 in it anyhow. A 3 speed, with the extra SLR should make it 60' a little better. A lightweight 3 speed would be even better. Depends on your goals. More rear gear, as was said, will help. Agree with a 5800 converter. Beyond that, if it's consistency on marginal tracks, you're probably best with that low gear. Want to go fast, need the low gear a 3 speed would offer. And more tire.

10-06-2024, 07:16 PM	#12
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Rear gear question Need a neutral or negative converter to get it to pull off line & the gear change. 5800 stall OK, but there is more to the converter than stall speed. I agree with tire and rear gear change. 1.96 low might wake it up too, but shift it at higher RPM with a lower low gear PG. You are carrying quite a lot of weight for a 7.38 starting line ratio...2.52 low gear 3 speed puts the SLR at around 10.33. With the right 3 speed converter it would pick up a bunch. Probably on the + side of .15.. __________________ Adger Smith (Former SS)

10-06-2024, 07:31 PM	#13
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Rear gear question oops! __________________ Adger Smith (Former SS) Last edited by Adger Smith; 10-06-2024 at 07:32 PM. Reason: Double down!!

10-07-2024, 11:45 AM	#14
Lenny5160_v2 Member Join Date: Feb 2023 Location: Inver Grove Heights, MN Posts: 175 Likes: 465 Liked 220 Times in 95 Posts	Re: Rear gear question I have to think the converter is real tight. My Nova is 3600#, 1.80 glide, 4.10 gear, 28" tire and has 660 HP. I can't go 133; 128 is about the best it'll do but it's usually a 1.40 60'. So, same running gear setup but heavier and less power. __________________ Tony Leonard S/ST 56 S/C 53

10-07-2024, 07:45 PM	#17
Stan Weiss Senior Member Join Date: Apr 2020 Location: Phila, PA Posts: 794 Likes: 0 Liked 734 Times in 385 Posts	Re: Rear gear question 3400# car, 28" tire, 739 HP, Auto trans I would want to see somewhere around an 11.5 SLR NOTE this is ONLY a recommendation for what might be a good STARTING POINT Stan

10-07-2024, 09:57 PM	#18
L.Fite Senior Member Join Date: May 2020 Posts: 516 Likes: 550 Liked 497 Times in 243 Posts	Re: Rear gear question 5.14 and a 3 speed might get him there...

10-08-2024, 08:04 AM	#19
Stan Weiss Senior Member Join Date: Apr 2020 Location: Phila, PA Posts: 794 Likes: 0 Liked 734 Times in 385 Posts	Re: Rear gear question A 2.74:1 first gear 3 speed and his present 4.1:1 would give him a 11.234 SLR. Not a bad starting point. Stan

10-08-2024, 09:07 AM	#20
1320racer VIP Member Join Date: Nov 2007 Location: New Jersey Posts: 2,628 Likes: 160 Liked 759 Times in 379 Posts	Re: Rear gear question SLR is internet forum bs like dynamic compression ratio. My SLR is 8.748, what am I doing wrong? Meanwhile, I have a data recorder, download every pass and KNOW at what RPM exactly my converter flashes to and falls back to on the gear change as well what RPM I'm shifting at and crossing the stripe at in addition to all the other data I record and plot every pass. Last edited by 1320racer; 10-08-2024 at 09:11 AM.