Lt1 rear gear?

Kdw1403 · 06-29-2021, 08:58 AM

What is preferred rear gear in a lt1 camaro. What is rpm difference between 4.88 and 5.14. How much would mph change. Not looking for answers from a calculation but from some people with experience with lt1 combo.

GUMP · 06-29-2021, 10:43 AM

What class?

Kdw1403 · 06-29-2021, 11:09 AM

B,c/sa

GUMP · 06-29-2021, 11:18 AM

I would run the 4.88. I never saw any gains from running more gear with an LT1. I also favor a 94" tire.

KRatcliff · 06-29-2021, 11:50 AM

I have always favored running as much gear as your engine can RPM. It is physics to me for moving a heavy stationary object and accelerating it through the 1/4 mile with the tongue hanging out at the end.

A 5.14 with a 94" rollout Hoosier or a 4.88 with a 92.5" Hoosier would be where I would lean. They almost work out the same. Our LT1's carry more weight than in the past and I think enough gear is key.

I was running a 5.00 for a long time and would bounce between the 92.5" and 94" depending on the air. I don't run an automatic anymore so I went to a different gear. I do have a new in the box Richmond 5.00 that I need to sell.

Rich Biebel · 06-29-2021, 01:45 PM

I made the gear swap from a 4.56 to a 4.88 and basically saw no ET difference.....

RPM went up 200-300

I was running A/FIA at the time and weighed around 3050lbs

Engine made it's fastest runs shifting 1-2 under 7000 and 2-3 at 7000

10.50's 124-125 in good air Not killer fast but not terrible.....that was 15 years ago !!

GUMP · 06-29-2021, 02:13 PM

We also ran a 4.56 in the IHRA days in A/FIA and Top Stock.

BrayJo · 06-29-2021, 02:56 PM

Quote:

Originally Posted by GUMP

We also ran a 4.56 in the IHRA days in A/FIA and Top Stock.

Are you running a Metric trans?

If so, with the 4:88 and 94 rollout what RPM are you through the lights?

KRatcliff · 06-29-2021, 05:37 PM

Quote:

Originally Posted by KRatcliff

....I do have a new in the box Richmond 5.00 that I need to sell.

I didn't actually list these yet, but they sold about 15 mins after I posted to a buddy in Houston. Thanks for all the interest.

Rich Biebel · 06-29-2021, 05:39 PM

I drove the car in 2011 at 2 races and by then it weighed 3200 in B/SA

Probably had the same 4.88's in it and a better fuel map and maybe a little better engine

Went 10.50's at 124-125 in real good air at Maple Grove....

Had E-shift in it then and Hoosiers.....

I ran 3066 M/T's and felt like they were faster than the Hoosiers.....

I did try moving the RPM up back when I owned the car but it did not run faster....

Big improvements in various engine parts and mods since then maybe make that not true anymore...

A few cars around that are pretty fast considering the weight that got lumped on them since I owned one....

One of my all time favorite cars I ever owned and raced....

06-29-2021, 08:58 AM	#1
Kdw1403 Member Join Date: Nov 2016 Posts: 205 Likes: 48 Liked 68 Times in 22 Posts	Lt1 rear gear? What is preferred rear gear in a lt1 camaro. What is rpm difference between 4.88 and 5.14. How much would mph change. Not looking for answers from a calculation but from some people with experience with lt1 combo.

06-29-2021, 10:43 AM	#2
GUMP VIP Member Join Date: May 2002 Location: Shelby, NC Posts: 1,819 Likes: 2,162 Liked 2,344 Times in 551 Posts	Re: Lt1 rear gear? What class?

06-29-2021, 11:09 AM	#3
Kdw1403 Member Join Date: Nov 2016 Posts: 205 Likes: 48 Liked 68 Times in 22 Posts	Re: Lt1 rear gear? B,c/sa

06-29-2021, 11:18 AM	#4
GUMP VIP Member Join Date: May 2002 Location: Shelby, NC Posts: 1,819 Likes: 2,162 Liked 2,344 Times in 551 Posts	Re: Lt1 rear gear? I would run the 4.88. I never saw any gains from running more gear with an LT1. I also favor a 94" tire.

06-29-2021, 11:50 AM	#5
KRatcliff Senior Member Join Date: Sep 2011 Posts: 765 Likes: 75 Liked 524 Times in 141 Posts	Re: Lt1 rear gear? I have always favored running as much gear as your engine can RPM. It is physics to me for moving a heavy stationary object and accelerating it through the 1/4 mile with the tongue hanging out at the end. A 5.14 with a 94" rollout Hoosier or a 4.88 with a 92.5" Hoosier would be where I would lean. They almost work out the same. Our LT1's carry more weight than in the past and I think enough gear is key. I was running a 5.00 for a long time and would bounce between the 92.5" and 94" depending on the air. I don't run an automatic anymore so I went to a different gear. I do have a new in the box Richmond 5.00 that I need to sell.

06-29-2021, 01:45 PM	#6
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,314 Likes: 25 Liked 544 Times in 213 Posts	Re: Lt1 rear gear? I made the gear swap from a 4.56 to a 4.88 and basically saw no ET difference..... RPM went up 200-300 I was running A/FIA at the time and weighed around 3050lbs Engine made it's fastest runs shifting 1-2 under 7000 and 2-3 at 7000 10.50's 124-125 in good air Not killer fast but not terrible.....that was 15 years ago !! __________________ Rich Biebel S/C 1479 Stock 147R

06-29-2021, 02:13 PM	#7
GUMP VIP Member Join Date: May 2002 Location: Shelby, NC Posts: 1,819 Likes: 2,162 Liked 2,344 Times in 551 Posts	Re: Lt1 rear gear? We also ran a 4.56 in the IHRA days in A/FIA and Top Stock.

06-29-2021, 05:39 PM	#10
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,314 Likes: 25 Liked 544 Times in 213 Posts	Re: Lt1 rear gear? I drove the car in 2011 at 2 races and by then it weighed 3200 in B/SA Probably had the same 4.88's in it and a better fuel map and maybe a little better engine Went 10.50's at 124-125 in real good air at Maple Grove.... Had E-shift in it then and Hoosiers..... I ran 3066 M/T's and felt like they were faster than the Hoosiers..... I did try moving the RPM up back when I owned the car but it did not run faster.... Big improvements in various engine parts and mods since then maybe make that not true anymore... A few cars around that are pretty fast considering the weight that got lumped on them since I owned one.... One of my all time favorite cars I ever owned and raced.... __________________ Rich Biebel S/C 1479 Stock 147R