RPM Diff. 3.45 vs. 410
Thread Starter
Race Director
Joined: Jan 2002
Posts: 12,263
Likes: 86
From: O'Fallon Missouri
RPM Diff. 3.45 vs. 410
My car with 4.10's is only turning 275 more rpms than my friends stock(?) 3.45's ar 60 mph. The 4.10's are turning 1650 rpms, and the 3.45's are turning 1375 rpms. Does this sound right?
Burning Brakes
Joined: Dec 2002
Posts: 947
Likes: 0
From: Middletown N.Y.
Re: RPM Diff. 3.45 vs. 410 (STL94LT1)
Do both of you have the same trans?Are you in the same gear? Using your 1:1 ratio's and a 26" tire: 2500 rpm w/ 3.45:1's you have 56mph
2500 rpm w/4.10:1's you have 47mph the 4.10:1's would need 3000 rpm to do 56mph a 500rpm diff. Now that doesn't account for convertor slippage and other variables, but it does state that it takes 500 rpm more with the 4.10:1's.
That's the rpm diff all else being equal. Good Luck!
MPH = rpm x tire dia/ ratio x 336
:thumbs:
2500 rpm w/4.10:1's you have 47mph the 4.10:1's would need 3000 rpm to do 56mph a 500rpm diff. Now that doesn't account for convertor slippage and other variables, but it does state that it takes 500 rpm more with the 4.10:1's.
That's the rpm diff all else being equal. Good Luck!
MPH = rpm x tire dia/ ratio x 336
:thumbs:
Le Mans Master
Joined: Apr 2002
Posts: 7,281
Likes: 5
From: Boston
Re: RPM Diff. 3.45 vs. 410 (JUAN J SANCHEZ)
Do both of you have the same trans?Are you in the same gear? Using your 1:1 ratio's and a 26" tire: 2500 rpm w/ 3.45:1's you have 56mph
2500 rpm w/4.10:1's you have 47mph the 4.10:1's would need 3000 rpm to do 56mph a 500rpm diff. Now that doesn't account for convertor slippage and other variables, but it does state that it takes 500 rpm more with the 4.10:1's.
That's the rpm diff all else being equal. Good Luck!
MPH = rpm x tire dia/ ratio x 336
:thumbs:
2500 rpm w/4.10:1's you have 47mph the 4.10:1's would need 3000 rpm to do 56mph a 500rpm diff. Now that doesn't account for convertor slippage and other variables, but it does state that it takes 500 rpm more with the 4.10:1's.
That's the rpm diff all else being equal. Good Luck!
MPH = rpm x tire dia/ ratio x 336
:thumbs:
Le Mans Master
Joined: Apr 2002
Posts: 7,281
Likes: 5
From: Boston
Re: RPM Diff. 3.45 vs. 410 (LT4BUD)
ZF6 is 0.50:1 NOT 0.49:1 in 6th gear.
http://www.corvetteactioncenter.com/...6/96specs.html
[Modified by Darkness, 3:37 PM 11/9/2003]
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Verdad Gallardo
Safety Car
Joined: Sep 2000
Posts: 3,524
Likes: 4
From: Hinckley Ohio
Re: RPM Diff. 3.45 vs. 410 (Darkness)
Very interesting!
Page 7-30 of the 1996 Corvette Service Manual says 0.50:1. I am looking right at it.
BUT
I just scanned a couple of Magazine articles on LT4/Grand Sport and they confirm your 0.49:1.
I have always used the 0.50 since that was in the GM manual but it looks like that is probably incorrect.
Geez o man........never can be sure when your right or wrong, oh I am wrong a lot it seems.... SORRY, & thanks for the feedback..
Page 7-30 of the 1996 Corvette Service Manual says 0.50:1. I am looking right at it.
BUT
I just scanned a couple of Magazine articles on LT4/Grand Sport and they confirm your 0.49:1.
I have always used the 0.50 since that was in the GM manual but it looks like that is probably incorrect.
Geez o man........never can be sure when your right or wrong, oh I am wrong a lot it seems.... SORRY, & thanks for the feedback..
Burning Brakes
Joined: Dec 2002
Posts: 947
Likes: 0
From: Middletown N.Y.
Re: RPM Diff. 3.45 vs. 410 (Darkness)
A little off the topic but while we are talking 6 speeds, did you guys know that the real good 6 speeds come in Vipers and came in some early 93-94 f-bodies? What I mean by good is that the gear ratio's were all close ratio 1st gear wasn't as low (2.80's) and 5th and 6th gear were/are .87 and .62 respectively. This trans would do wonders for acceleration especially in top speed were your rpms won't drop to far from 4th-5th-6th maintaining good acceleration through out!
