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4.30 switch to 4.56

 
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kurt02gt
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Joined: 09 Jul 2007
Posts: 12
Location: Broadview Hts, Ohio
497.68 points


2002 Ford Mustang

PostPosted: Tue Jul 10, 2007 3:12 pm    Post subject: 4.30 switch to 4.56 Reply with quote

I just switched to 4.56 gears so I can cross the finish line closer to my shift point.
My question is how much of a ET improvement can I expect by switching from 4.30 to 4.56 with traction not being a issue?

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2002 Mustang GT
Best ET: 11.90@113MPH
Best 60ft: 1.58

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Paul P
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Joined: 15 Aug 2002
Posts: 2449
Location: Townsend, Mass.
83052.36 points


1971 Chevrolet Chevelle

PostPosted: Tue Jul 10, 2007 4:40 pm    Post subject: Reply with quote

My guess is a tenth or so.
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2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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nwcc
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Joined: 11 Aug 2005
Posts: 453
Location: Pacific Northwest
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PostPosted: Tue Jul 10, 2007 6:56 pm    Post subject: Reply with quote

There's several variables to consider.
But, I'll 2nd that its at least a tenth.
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Knarley Darley
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Joined: 22 Apr 2004
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PostPosted: Wed Jul 11, 2007 8:56 am    Post subject: Reply with quote

Whatever you pick up in the 60' will also be multiplied by the same amount during the rest of the run. So if you pick up .5 in the 60' you should see a total of .1 for the whole run. It could help more though depending on your combo.
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squeeezer
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Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
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1991 Chevrolet Camaro

PostPosted: Thu Jul 12, 2007 11:43 am    Post subject: Reply with quote

what rpm will you have to pull for 4.56 gears top of the track in third gear
with automatic thm350 or 700
and 3000stall
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kurt02gt
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Joined: 09 Jul 2007
Posts: 12
Location: Broadview Hts, Ohio
497.68 points


2002 Ford Mustang

PostPosted: Thu Jul 12, 2007 12:29 pm    Post subject: Reply with quote

squeeezer wrote:
what rpm will you have to pull for 4.56 gears top of the track in third gear
with automatic thm350 or 700
and 3000stall


according to the calculator I'll be around 6500-6600rpms which is where I shift anyways. My peak HP is at 6200rpm.

Thanks everyone, I was guess a tenth also but I'l know for sure this weekend.

_________________
2002 Mustang GT
Best ET: 11.90@113MPH
Best 60ft: 1.58

C4 Swap Complete New Times Coming Soon!
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