Raise/remove factory fuel-cut limiter.

[Panici]

Hey guys,
I'm building a digital tachometer and spark-cut rev limiter.


Is there any way to raise or remove the factory fuel cut limiter?

How tolerant are these motors to over-rev?

[FestYboy]

not unless you can trick the ECU into seeing half the rpm and then use an external limiter, but that's a tricky proposition because the ECU looks at the hall effect sensor in the dizzy to determine which pair of injectors to fire and it's a batch fire system (2 at a time). and then you'd also have to contend with the IAC trying to compensate for the ECUs command to add air due to the low RPMs (durring startup anyway, untill it gets warm).

best bet here is a standalone controler.

oh, and IF you're able to do it, the factory topend is good to 7800-8000 rpm without worry (i just wouldn't say at that for too long though, the WP and Alt aren't designed for it)

[Panici]

not unless you can trick the ECU into seeing half the rpm and then use an external limiter, but that's a tricky proposition because the ECU looks at the hall effect sensor in the dizzy to determine which pair of injectors to fire and it's a batch fire system (2 at a time). and then you'd also have to contend with the IAC trying to compensate for the ECUs command to add air due to the low RPMs (durring startup anyway, untill it gets warm).

best bet here is a standalone controler.

oh, and IF you're able to do it, the factory topend is good to 7800-8000 rpm without worry (i just wouldn't say at that for too long though, the WP and Alt aren't designed for it)

Alright, some good info there.

I thought I read about a mod/tune to the factory ECU that allows a rev limit change?
EDIT, here:

http://www.amazon.com/Programmable-LIMITER-Ignition-Controller-WARRANTY/dp/B004W2YP44

Does anyone have one of these units? Maybe I can reverse-engineer it and make my own.

[festyfreak39]

Hey bud, What is your main cause for changing the rev limiter?

From personal experience there is nothing above the factory rev limit on any of our motors unless you are going to balance the rotating assembely, or change the intake manifold and throttle body .

[Panici]

Hey bud, What is your main cause for changing the rev limiter?

From personal experience there is nothing above the factory rev limit on any of our motors unless you are going to balance the rotating assembely, or change the intake manifold and throttle body .

Replacing the factory limiter with a spark-cut design.

[kellen302]

Because it sounds cooler and makes fire come out the back right?

[Panici]

Because it sounds cooler and makes fire come out the back right?

Yes, and because it's an excellent design project for Engineering students.