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White13

Ss/sb dyno

20 posts in this topic

Build specs

+2 stainless Cuervo Racing head

Cuervo Racing 5050 cam

54mm TB

850cc injector

14:1 CP stock bore piston

MSD

Monster Megs drag pipes

VP C85 fuel

Direct Drive lockout

Big thanks to Cuervo Racing for all the help and for building a badass head, and Knobbies Motorsports for dialing in the tune.

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Nice, looking forward to seeing it run tomorrow. I can't wait to see how ours stack up.

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Really learned a lot running it on the dyno, bike ran great before it was tuned, the first pull the air/fuel ratio went from 9.0-16.0 across the curve and almost all of the timing was pulled out of it. I've heard ethanol was a very forgiving fuel and this really proved it first run made 80.xx hp, so it only picked up a little over 1 hp with tuning goes to show even with a fucked up a/f ratio and no timing ethanol still makes great power. This motor really didn't like timing ended up retarding it 5 degrees from 70% throttle and up! and gave it just a few degrees every where else. Also, ethanol motors need to be warm, in between runs the motor cooled to 110 degrees and lost about 2 hp after letting it warm up it we ran it again and all the power was back, heat is your friend with ethanol. Also, I didn't do the spark plug wire mod that would have helped it as well.

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sounds about right on the timing... ive seen up to -12 on some combinations,,, IM glad u got it dialed in and you can have a lot more piece of mind!

 

The ECU will pull timing when engine temp is below 150... so get it above that point when your out and racing!

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That Cuervo power is addicting! Nice looking curve. 80+hp on a Fuel injected sb/ss isn't bad at all!

Hustler Sponsors

Cuervo Racing

Stellar Machine and Performance

MidWest Coatings

Monster Quad ATV

Direct Drive

Custom Seats of Louisiana

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Might as well, that 870 is a

Monster

Hustler Sponsors

Cuervo Racing

Stellar Machine and Performance

MidWest Coatings

Monster Quad ATV

Direct Drive

Custom Seats of Louisiana

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Hopefully gonna go 870, that'll give the turbo guys something else to chase.

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