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-   General Boating Discussion (https://www.offshoreonly.com/forums/general-boating-discussion-51/)
-   -   What to set the rev limiter to on an hp500 carb'd? (https://www.offshoreonly.com/forums/general-boating-discussion/222175-what-set-rev-limiter-hp500-carbd.html)

blue thunder 01-04-2010 06:36 AM
Originally Posted by Griff (Post 3017024)
Recommended WOT RPM of the 500HP is 4800-5200rpms. The rev limiters are supposed to be at 5350rpm, but vary somewhat and also tachs can be off. If you have TB IV ignition, the rev limiter is a separate part and can't be changed. If its a TB V, then I think you can have the limiter in the ECM changed.
I believe he is going with an MSD amplifier with the rev limiter chip. He should be able to change it in 500rpm increments.

Thunderstruck 01-04-2010 10:14 AM
Originally Posted by Gizmo (Post 3016895)
Thunderstruck, What props are you running?
30" Lab finished B1s. However, my 500 HPs are now 600 HPs with AFR heads/custom cams but the rotating assblys are stock. Little higher spring pressure than stock. Using Morel lifters, Ferea valves and Manley-Nextech springs.

Thunderstruck 01-04-2010 10:20 AM
Originally Posted by DisturbedVelo22 (Post 3016866)
the springs have 50 hours on them and they are springs recommended as stock replacements. I'm pretty sure (at least its what the rpm gauge is reading) the motor is buzzing 5450 with the stock ignition. Did you guys set the distributer up like the stock?
My distributors are stock. I went with the Crane HI6M boxes because they are compatible with hall effect trigger sensors that are on the stock distributors. Don't you have to run a mag trigger with the MSD boxes? Running 36 deg total timing with the aluminum heads, 9.6:1 compression (93 Octane for insurance against preignition/detonation).

blue thunder 01-04-2010 12:46 PM
I ran my tbolt 4 ignition with the msd 6al boxes. I did this for the rev limiter feature primarily as tbolt 4 don't have a rev limiter.

DisturbedVelo22 01-05-2010 08:24 PM
Originally Posted by blue thunder (Post 3017049)
I believe he is going with an MSD amplifier with the rev limiter chip. He should be able to change it in 500rpm increments.
Correct, I have the whole MSD set-up, distributor, coil and amplifier.

Griff 01-06-2010 01:17 AM
In that case, you could easily bump the MSD rev limiter up to 5500rpms.


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