Hey guys, just a quick question.
Im hoping someone has some experiencing with adjusting the rev limiter the easiest way. I'm not looking to adjust any fuel, so even though I will probably have to get a SAFC II. I'd like to see if anyone knows of a better way to reduce the rev limit. My application is that I'm running a AP2 engine with an AP1 ECU and want to ensure I don't rev past 8k.

Thanks

 

Ap2 ecu is easiest and cheapest

 

Also FYI ap2 rev limit is 8200. Ap1 is 9000

 

Could possibly throw a bee-r limiter on there? Not sure if that's cheaper than the correct ECU though.

 

This is exactly what I was looking for, thanks for the suggestion.

 

Stock rev limit is 8200, but a hard bounce in lower gears will push it past 8600. I've been running mine to 8500 with a soft limiter for years.

Stock AP1 is 8900

 

Can you explain a hard vs soft bounce Gernby?
Im guessing an over rev from a 3-2 or similar mis shift is "hard" and a bouncing off while riding a gear out is "soft" but what is different in a tune ....?

 

I would assume the bee-r would solve any over rev issues even when downshifting? I havnt gotten around to throwing mine on yet but I would like even on a downshift over reving would be stopped assuming the limiter was set correct?

 

There is nothing you can do for a miss shift/mechanical over rev. That’s purely on the driver.

I run an ap1 ecu with an F22. That ecu ramps up the fuel very quickly from 8 to 9krpms, and F22 power peaks just after 8k. You can feel the power drop off pretty rapidly after 8200-8.5k and so that’s when you shift. Rarely do I ever hit the rev limiter except if I over run to get to the next corner at the track, and the motor takes the rpm just fine. Would I make a habit out of revving it to 9k? No I wouldn’t suggest it as im sure it will ovalize the bores overtime and shorten the life in the long term. 8500rpm is the equivalent ap1 piston velocity so that’s where im most comfortable long term. Mechanically the rods and everything else will take the 9k rpm however.

 

No. A rev limiter cannot work on downshifts. In the case of a downshift over rev, the wheels are powering the engine. Unless the limiter can disengage the clutch, the engine is along for the ride.