Performance tuners

[88 pioneer Olympic]

Ive heard that their are tuners for 88 renix 4.0 motor ive seen photos but i never found any and i was wondering if anyone has ever had any luck finding them 

[big66440]

I Don't think they exist, not saying it's impossible but I don't think there are any readily available on the market.

[hick92]

Jet performance might make a chip for it

 

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[Eagle]

Chip tuners basically advance timing, as evidenced by the fact they require the use of high-octane fuel. The closest thing I know of to a "tuner" for the Renix is the high-altitude CPS, which allows for more advance. But the Renix doesn't really need a chip -- thanks to the knock sensor, the performance is already there. You just have to unlock it -- by filling up with high test gas.

 

I tested this with my '88 XJ when it was fairly new. I tried running mid-grade and high test gas. On high test, I could feel the difference in the seat-of-the-pants dyno, and my fuel mileage on a trip from Connecticut to mid-Vermont and back -- carrying a girlfriend, two kids, and clothing and "stuff" for a weekend, was 28 MPG. On regular gas the mileage was never higher than 21 or 22 MPG.