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Unread 03-03-2013, 09:08 PM   #1
njyj609
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1989 YJ Wrangler 
 
Join Date: Feb 2013
Location: capemay, n.j.
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performance engine upgrades for i4?

Although I'm generally satisfied with the performance of my 4cyl, I would like a bit more. I have found that there is a lack of performance upgrades for this little motor( coil, headers, Cams etc). I've asked my buddies& most say " why bother, just stick in a 6cyl".... but I'd have to swap out the tranny too..... (not in the budget)..... any ideas to get what I can out of the i4?..... it's mostly a DD but I do go play in the mud every chance I get.... re-gear for more speed less torq an option?

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Unread 03-03-2013, 09:10 PM   #2
cstone94
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Quote:
Originally Posted by njyj609 View Post
Although I'm generally satisfied with the performance of my 4cyl, I would like a bit more. I have found that there is a lack of performance upgrades for this little motor( coil, headers, Cams etc). I've asked my buddies& most say " why bother, just stick in a 6cyl".... but I'd have to swap out the tranny too..... (not in the budget)..... any ideas to get what I can out of the i4?..... it's mostly a DD but I do go play in the mud every chance I get.... re-gear for more speed less torq an option?
Honestly, your friends are right. The money you spend on rehearing, this includes both front and rear, ~$400, Intake, Cam, etc... You're better off "budget" wise to swap in a 4.0L.
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Unread 03-04-2013, 01:20 AM   #3
jsawduste
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Relocate the IAT and the crank sensor. I`ve covered both in past posts.
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Unread 03-04-2013, 06:55 AM   #4
Que89YJ
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The older 2.5L like ours is a little more difficult to modify cheap because of the throttle body injection. Rad fan, regear, + Jsawduste recommendations.
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Unread 03-04-2013, 07:40 AM   #5
grandboost98
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Quote:
Originally Posted by jsawduste View Post
Relocate the IAT and the crank sensor. I`ve covered both in past posts.
Good thinking. You got me interested and so I just did a search and came up with some old threads that your pics were no longer working. Good info though

I did read that you can use a TJs without relocating it to the airbox and it will trick the computer to thinking its 60* colder than what it really is. Dont know exactly how true that is but seems easier than relocating it
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Unread 03-04-2013, 08:00 AM   #6
Fuddmaster
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Quote:
Originally Posted by njyj609
Although I'm generally satisfied with the performance of my 4cyl, I would like a bit more. I have found that there is a lack of performance upgrades for this little motor( coil, headers, Cams etc). I've asked my buddies& most say " why bother, just stick in a 6cyl".... but I'd have to swap out the tranny too..... (not in the budget)..... any ideas to get what I can out of the i4?..... it's mostly a DD but I do go play in the mud every chance I get.... re-gear for more speed less torq an option?
The bigger throttle body helps, from a 4.0l. I've heard bigger injectors but never looked into it
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Unread 03-04-2013, 06:38 PM   #7
njyj609
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Thanks all... I will search your earlier threads jsawduste...... que89yj; Radfan? As in radiator fan? Would you mind explaining what you are suggesting? & I will do some research on the throttlebody, that sounds like a great idea.
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Unread 03-04-2013, 07:17 PM   #8
baritone_mike
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Yes he is talking about the radiator fan.

An electric fan from a Ford Taurus is enough to keep the Jeep cool. It will free up the power that the big clutch fan on the front of your engine uses. You can also wire it to turn on and off when you want it to, so you can switch it off before a water crossing or flip it on before a big mountain pass to keep it cool.

http://www.jeepforum.com/forum/f12/e...rk-vii-506679/

*I have not done this swap*
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Unread 03-04-2013, 07:30 PM   #9
Que89YJ
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Can't do the throttle body on our 2.5 only the 91 mpfi and later.
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Unread 03-04-2013, 08:03 PM   #10
Chrisnvegas
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There are performance kits available for the 2.5 but are kind of pricey. They claim 45% more HP and 55% more torque for @ $1700.00

I'm surprised Summit Racing doesn't sell cams or pistons for this motor.

http://www.shop.505performance.com/c...?categoryId=40
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Unread 03-04-2013, 08:04 PM   #11
njyj609
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I see... I just went through older posts and I think I get it..... the electric fan, tbi swap & sensor relocation seem to be agreed on as the only meaningful mods for the 4 cyl . The little torqmonster just doesn't have the horses to give.... & que89yj; very disapointed that I can't do the tbiswap ..... I must admit tho, I have a nice dodge ram & still take the Jeep instead.... ha..... thanks to you all!
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Unread 03-04-2013, 08:06 PM   #12
njyj609
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I can't believe a performance coil isn't available tho...... really?
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Unread 03-04-2013, 09:19 PM   #13
Que89YJ
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4 bangerjp.com and read.
You have tbi you can't swap the tb.
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