Disabling the rev-limiter on a JT.

[Huw Powell]

> I just pulled the JT motor out of the QSW yesterday to swap the rebuilt MC
> in. I'm going to be using the JT ignition system, with standalone EFI
> (Megasquirt) I need to disable the 6200 RPM rev limit. Can anyone tell me
> how to do this.

As Javad pointed out, it is fuel pump relay dependent, and a safety
feature on the other end (engine dies, pump stops pumping)

So here is an idea... we all know what happens when someone swaps a 4
cylinder relay into a 5 cyl car - the cutoff drops by 20% to about 5000
rpms.

This is because the fpr "counts" coil pulses to determine rpms, not
actual revs.  so it has a divider factor based on how many cylinders
there are.

How about finding a fpr from a *6* cylinder engine with a similar
electrical profile?  It might plug and play, and get you a cut off up in
the 7000+ range.

Try looking at Bentzes, WMBs, Slaabs and Ovlovs from the 80's in
junkyards?

Worst thing you might have to do is make an adapter harness to plug it
in, if the pinout is different.

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/