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Performance chip for 1990 XJ

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Old 12-06-2013, 12:58 AM
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Default Performance chip for 1990 XJ
Does anyone know if any performance chips (particularly JET) will work with the 1990 cherokee computers even though they always list for 1991 and newer??
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Old 12-06-2013, 01:36 AM
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It will not work. Don't even waste your money. They don't work on any year xj.
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Old 12-06-2013, 04:59 AM
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Originally Posted by hotrod500
Does anyone know if any performance chips (particularly JET) will work with the 1990 cherokee computers even though they always list for 1991 and newer??
Replace your CPS with a PC307 from RockAuto and that will advance the timing a bit. If they still have them. Be sure to drill the upper mounting hole. Post 7.

Be sure your distributor is indexed correctly. Post 13.

In my link below........
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Old 12-06-2013, 02:07 PM
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Originally Posted by cruiser54
Replace your CPS with a PC307 from RockAuto and that will advance the timing a bit. If they still have them. Be sure to drill the upper mounting hole. Post 7.

Be sure your distributor is indexed correctly. Post 13.

In my link below........
Thanks alot, im def going to check that out.
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Old 12-06-2013, 02:40 PM
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Originally Posted by cruiser54
Replace your CPS with a PC307 from RockAuto and that will advance the timing a bit. If they still have them. Be sure to drill the upper mounting hole. Post 7.

Be sure your distributor is indexed correctly. Post 13.

In my link below........
HEY Thanks for the info
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Old 12-06-2013, 03:41 PM
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Didn't someone make an upgraded ECU for the RENIX? I remember someone here saying they had one...Cruiser?
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Old 12-06-2013, 05:18 PM
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Originally Posted by highmileage
Didn't someone make an upgraded ECU for the RENIX? I remember someone here saying they had one...Cruiser?
There was one, but rare. I don't have one though.
I have my own methods to pull a bit more HP out of the REnix motors.
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Old 12-06-2013, 05:28 PM
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EDIT: nevermind, stupid slow refreshing.

Cruiser IS the upgraded Renix ECU.
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Old 12-06-2013, 05:30 PM
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Originally Posted by salad
EDIT: nevermind, stupid slow refreshing.

Cruiser IS the upgraded Renix ECU.
That would be a good write-up for the future, eh?
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Old 12-06-2013, 05:38 PM
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Go Go Gadget Microcontroller!

Could be a real problem with the holidays coming up. How many people at the dinner table will be able to talk like a DRB?
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Old 12-06-2013, 06:13 PM
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Originally Posted by salad
Go Go Gadget Microcontroller!

Could be a real problem with the holidays coming up. How many people at the dinner table will be able to talk like a DRB?
You oughta see my USB port!!
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Old 12-06-2013, 06:15 PM
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Originally Posted by cruiser54
There was one, but rare. I don't have one though.
I have my own methods to pull a bit more HP out of the REnix motors.

Just a thought, Fords' inline had a chip and a similar setup to ours could some wiring genius make that happen?
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Old 12-06-2013, 06:28 PM
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Well considering a lot of "chips" are actually resistors that fool the MAP sensor, sure, why not?
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Old 12-06-2013, 06:30 PM
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Originally Posted by salad
Well considering a lot of "chips" are actually resistors that fool the MAP sensor, sure, why not?
Called a MAP sensor adjuster.



http://www.strokedjeep.com/regulator.html
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