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 · Yesterday, 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 · Yesterday, 12:25 PM

Quote:

Originally Posted by Lenny5160_v2

I have to think the converter is real tight.

or heads are too big

CMcAllister · Yesterday, 07:29 PM

Quote:

Originally Posted by 1320racer

or heads are too big

or cam

Stan Weiss · Yesterday, 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 · Yesterday, 09:57 PM

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

Stan Weiss · Today, 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 · Today, 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: 564 Likes: 12 Liked 791 Times in 223 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: 2,404 Likes: 503 Liked 733 Times in 283 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: 2,404 Likes: 503 Liked 733 Times in 283 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!!

Yesterday, 11:45 AM	#14
Lenny5160_v2 Member Join Date: Feb 2023 Location: Inver Grove Heights, MN Posts: 135 Likes: 347 Liked 181 Times in 76 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/C & S/ST 5160

Yesterday, 07:45 PM	#17
Stan Weiss Senior Member Join Date: Apr 2020 Location: Phila, PA Posts: 663 Likes: 0 Liked 585 Times in 316 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

Yesterday, 09:57 PM	#18
L.Fite Member Join Date: May 2020 Posts: 432 Likes: 430 Liked 394 Times in 199 Posts	Re: Rear gear question 5.14 and a 3 speed might get him there...

Today, 08:04 AM	#19
Stan Weiss Senior Member Join Date: Apr 2020 Location: Phila, PA Posts: 663 Likes: 0 Liked 585 Times in 316 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

Today, 09:07 AM	#20
1320racer VIP Member Join Date: Nov 2007 Location: New Jersey Posts: 1,991 Likes: 90 Liked 555 Times in 267 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; Today at 09:11 AM.