Diff ratio answer required

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Sep 3, 2016 | 04:40 PM

ls1 1990 VN

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From: Auckland, Nth Is, New Zealand.

Diff ratio answer required

Need advice on what diff ratio I need for my new engine power.

I've been thinking 3.45.1

566 rwhp & 613 ftlb rwtq

Currently running 4.10.1 from my old setup

Running a 6sp T56
1st 2.66
2nd 1.78
3rd 1.30
4th 1.00
5th 0.84
6th 0.56

285-30x18 tyres

Sep 6, 2016 | 03:12 AM

ls1 1990 VN

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From: Auckland, Nth Is, New Zealand.

So many replies, so many different choices.....

Guess I'll go 3.73

Sep 7, 2016 | 10:01 AM

MidwestChassis2

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I would search for a couple different online performance calculators as they will give you all kinds of insight to what will work best for you.

Sep 7, 2016 | 01:00 PM

Carl at CRP

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From: Wichita, KS

http://www.wallaceracing.com/gear-speed.php

http://www.wallaceracing.com/Calculators.htm

Sep 9, 2016 | 03:32 AM

ls1 1990 VN

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From: Auckland, Nth Is, New Zealand.

Quote:

Originally Posted by Carl at CRP

http://www.wallaceracing.com/gear-speed.php

http://www.wallaceracing.com/Calculators.htm

Thanks Carl,

Good insite, Not sure what I can gather from the calculators. I need more real world imput from guys that have similar HP & TQ

Sep 9, 2016 | 04:53 PM

99SSJarhead

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From: Deloit IA

What are your goals with the car? Straight line track? Autocross? Fun street? Or highway cruiser? A few more specifics will help people get you in the right direction.

Sep 9, 2016 | 04:58 PM

HCI2000SS

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From: Howell & Fenton MI

I know it's not a direct comparison, but I run 4.10's with a T56 and about 600 rwhp & rwtq on the 150 shot. Honestly I hate this gear with the nitrous, but it's perfect n/a.

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Sep 9, 2016 | 11:25 PM

ls1 1990 VN

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From: Auckland, Nth Is, New Zealand.

Quote:

Originally Posted by 99SSJarhead

What are your goals with the car? Straight line track? Autocross? Fun street? Or highway cruiser? A few more specifics will help people get you in the right direction.

The odd track day being circuit sprints

Occassional drags, maybe 3 times a year

Generally street

I have just had my old LS1 516fwhp n/a taken out & this new engine in.

Quote:

Originally Posted by HCI2000SS

I know it's not a direct comparison, but I run 4.10's with a T56 and about 600 rwhp & rwtq on the 150 shot. Honestly I hate this gear with the nitrous, but it's perfect n/a.

I have been running 4.10s but it now just blows the tyres 'circuit semi slicks'

The cars gone in for a set of 3.73s this morning, I gave it a lung full in 2nd gear & something in the diff didn't like it.

Had to settle on what I thought would work best.