Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

peak hp

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Old Feb 21, 2011 | 07:56 PM
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straightleg's Avatar
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From: canada
Default peak hp

does the cam duration dictate where the horsepower peak is?

I ran 13.2 when I dyno'd my car it made 337hp rear wheel hp@5440rpm
I now run 12.25 only thimg I've changed is I pulled 70lbs of wieght between me and the car, freed up hp with electric water pump, fans, and ram air duct to the carb.
so if I'm thinking correctly I should still peak @ 5400rpm but I've freed up more usable hp.

reason I'm wondering because I'm triing to select a new rear gear that matches my peak hp.
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Old Feb 22, 2011 | 09:33 AM
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What size rear tire? Is this more race, street or 50/50?
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Old Feb 22, 2011 | 03:28 PM
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27" Tire, 90% Race
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Old Feb 22, 2011 | 06:27 PM
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I'd go with 4.10's now. You will probably cross the line at roughly 6200. The engine should be able to hold on to that RPM. I would shift at about 6000RPM if peak was 5500RPM.

I cross at 6400 with a 26.5" tire, same trans and a 3600 stall. I switched from 3.73's and it wasn't a huge RPM increase. Car likes it, but I could use a higher stall (4500 would be about perfect).
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Old Mar 11, 2011 | 09:04 AM
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that 700r4 trans has a really low first . be careful that u dont gear too low or traction might be a problem
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