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Old 05-29-2015, 06:33 PM   #7
Super73
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Join Date: Nov 2007
Location: Bay Area, Ca
Posts: 2,841
Re: On the dyno in the am

Explanation on the graph. Unfortunately I could not do an overlay from previous dyno as the old PC died and files have not been moved from the old hard drive. But..

The motor previously made 520rhwp and on the same N20 tune up made 690rwhp. These numbers were corrected. So that means the new cam actually lost me 30rwhp NA and 37rwhp on the unit. I am not sure however the effect the 4.56 to 3.90 gear had.

Peak TQ was still made 5,600-5,700 rpm, however this cam seemed to make peak HP a little earlier too at about 6,700 vs my 254/260 at 6,900.

I think I am going to try the 251/266 cam I have to see what that does for me.

One thing I did confirm though is the Granatelli wires are definitely noisy. The N20 controller does not work properly when they are on the motor. I put stock wires on the motor for a NA test running a ground loop through the controller. The controller had no issues with stock wires. I will be getting a set of MSD to see if that helps the controller out.
__________________
------Motor---------------Bottle
60'---1.53---------------1.41
1/8---6.58 @ 105.92----5.87 @ 118.41
1/4---10.38 @ 126.97----9.24 @ 142.49
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