Disabling the rev-limiter on a JT.

[Michael Gough]

They all have the fuel cutoff in the computer right? Same as the MC and NG
do with their 6800 RPM cutoff.
I'll check the yards for the FPR from a CIS Volvo 6 cylinder. I don't think
I have any Volvo parts on the car yet...I have stuff from just about every
other car manufacture though!
If the cutoff of the one I get is at 6000 RPM it'll give me 7200, and if
it's higher, even better ;)

Mike
'88 QSW Turbo/EFI




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> 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/
>>
>>
>>
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