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Old 04-25-2010, 10:25 PM
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Improving performance of 4cyl

I have a 92 yj 5 speed and the 4cyl it has 31.5 x 10 tires.
What can I do to get more performance from the 4cyl?
upgrade / aftermarket ignition system? Exhaust system? any ideas?
I do like the 4cyl don't want to swap engines.
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Old 04-25-2010, 10:32 PM   #2
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Air intake, Exhaust, throttle body spacer. Check these links. LINK 1, LINK 2.

1990 YJ - Lifted, Locked, 35's, etc...

1999 XJ - Lifted, 31's, DD
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Old 04-25-2010, 11:57 PM   #3
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The 4 is a good engine
Dont waste your money on Air intake or on a TBS

"locked and loaded"
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Old 04-26-2010, 10:11 AM   #4
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Keep it clean

Do your oil changes regularly

Keep good plugs,wires,cap & rotor

Run Lucas with your oil on the next change

Don't ever let it overheat, and don't over-rev it. (top 2 causes of engine failure)

Don't waist money on splitfires and K&Ns and all that... you won't gain enough to make a noticeable difference.

Enjoy for many years to come!!!
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"roads are boring"

1994 Wrangler YJ I6 4.0 H/O Auto 3 spd. 3:55 Gears
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Old 04-26-2010, 10:23 AM   #5
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Park it and walk?! BTW I have a four cyl so I know your pain.
Know nothing SPEAK on everything

Originally Posted by ccain View Post
Isn't the JK just a rebodied PT Cruiser?!

Originally Posted by coyote_94yj
Just a few more inches Red. You can take it.

If you haven't gotten more out of the insurance company than you deserve, then you haven't screwed them nearly as much as they have been screwing you for the past xx years.
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Old 04-26-2010, 09:32 PM   #6
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Im considering doing a snorkel because you will get about 5 hp to the wheels, better gas mileage, its a cool looking mod and gets cleaner air!

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