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 Post subject: New gears
 Post Posted: Sat Oct 06, 2012 9:29 am 
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Joined: Thu Feb 12, 2009 7:52 pm
Posts: 348
So I plan to do a swap from 4.56 to 4.86s. It will help out my SLR from a 8.2 to an 8.75. Figure it will increase my rpms about 400 rpms through the 1/8.

Do you all think I will see positive results?

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74 Nova
Best 9.87@131 on the rev limitor 1 Feb 2013
1/8   6.15@110 NEW BEST 27 Nov 11
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 Post subject: Re: New gears
 Post Posted: Sun Oct 07, 2012 11:25 am 
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Joined: Wed Apr 19, 2006 6:43 am
Posts: 1980
Location: Tell City, IN
It all depends. Haw many RPM's you crossing at now? What RPM range for the cam? How big of a carb?

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6.11@110 Gas
1.3718 Sixty Foot with the rear wheels Gas

6.07@110 on Alcohol Injection with a 4-link 4-6-12
Best 60' 1.2537 Alcohol Injection 4-29-11
Thru the Mufflers!!


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 Post subject: Re: New gears
 Post Posted: Sun Oct 07, 2012 11:46 am 
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Joined: Thu Feb 12, 2009 7:52 pm
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I am crossing the 1/8 around 6500-6600 rpms. Figure the gear change should bump it to around 7000 but that isn't taken into account any additional et/mph gained by the change. Cam makes good power to 7400-7500, engine made peak power at 7000. I got my 830 demon on there now, but I got my dominator that I plan on throwing on there. It has the same specs as the one mark won the carb challenge with.

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74 Nova
Best 9.87@131 on the rev limitor 1 Feb 2013
1/8   6.15@110 NEW BEST 27 Nov 11
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 Post subject: Re: New gears
 Post Posted: Sun Oct 07, 2012 6:04 pm 
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Joined: Wed Apr 19, 2006 6:43 am
Posts: 1980
Location: Tell City, IN
Should help then. I would look for 5 or so numbers anyway. Could be better.

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6.11@110 Gas
1.3718 Sixty Foot with the rear wheels Gas

6.07@110 on Alcohol Injection with a 4-link 4-6-12
Best 60' 1.2537 Alcohol Injection 4-29-11
Thru the Mufflers!!


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 Post subject: Re: New gears
 Post Posted: Tue Oct 09, 2012 10:35 am 
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Joined: Tue Apr 18, 2006 3:20 pm
Posts: 1457
Location: Missouri
It should help the ET and a 5.14 or 5.38 would make it even quicker if it can still hook.

Rick


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 Post subject: Re: New gears
 Post Posted: Tue Oct 09, 2012 12:01 pm 
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Joined: Thu Feb 12, 2009 7:52 pm
Posts: 348
I got a good deal on the 4.86s, but I have been eyeballing some 5.29s on the roush website. Although I would be turning more rpms than I would want. It would be fun to try. Still want to see how these nascar gears hold up before I get more.

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74 Nova
Best 9.87@131 on the rev limitor 1 Feb 2013
1/8   6.15@110 NEW BEST 27 Nov 11
Image


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 Profile  
 
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