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Unread 03-12-2005, 12:26 AM   #1
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Join Date: Mar 2005
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Jet Performance Chips

I was thinking about buyin a Jet Performance Module to increase horse-power and was wondering if anyone else had bought this part and could tell me if it really worked, thanx


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Unread 03-12-2005, 06:20 AM   #2
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2005 LJ Wrangler 
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Location: Oxford, CT
Posts: 2,438
I bought one for my 91 YJ and it was a big waste of money. I didn't really notice any performance increase and it the manual suggest using 91 octane fuel. I also had a problem where moisture got inside it, even though I wrapped the connection with the tar tape they give you, causing my Jeep to run like c--p until I removed it.
2005 LJ Impact Orange 4.0L Automatic (Tigger) - new ride
1991 YJ Sahara 4.0L Automatic
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Unread 03-12-2005, 03:02 PM   #3
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1987 YJ Wrangler 
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Location: Upstate NY
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I think the reason they suggest premium gas is because the chip advances the timing farther than the stock computer program to make more power. Without 91 octane the advanced timing would cause pinging in the engine, which the knock sensor would detect and force the computer to retard the timing again, basically negating the chip's advance. That's my theory at least.

My dad got a Jet chip for his Explorer and I noticed a little difference when accelerating. He doesn't always run premium though, but when he does I seem to feel a little more of a difference.
'87 YJ Laredo - 4.0L, AX-15, NP231, 4.10s: 3.5" BDS, 31" Muds

'95 XJ - Donated drive train to the YJ, Parted out the rest

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Unread 03-12-2005, 03:07 PM   #4
Ol'Blue Jeep
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Location: St. Augustine, Florida
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get the jet stage 2 chip, but you need a new exhaust and a new thermostat to run it, those 3 things combined should give you a very nice boost in power
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