Disabling the rev-limiter on a JT.

[Bob]

--
[ Picked text/plain from multipart/alternative ]
what about out of the 3B which has a 7200 rpm rev limit.. or even the 7A

Huw Powell wrote:

>*This message was transferred with a trial version of CommuniGate(tm) Pro*
>
>
>
>>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/
>
>
>

--