thinking of a turbo setup for my xj

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03-10-2010 | 10:51 AM

#16

93XJLI

CF Veteran

Joined: Jan 2008

Posts: 3,671

Likes: 10

From: LI, NY

Year: 1998

Model: Cherokee

Engine: 4.0, bolt ons for days...

Quote:

Originally Posted by Testament

The issue is not really installing the thing, it's tuning it. you would need some kind of programmable ecu to control the fuel and spark. and then somone who know what they are doing to set it up. Has anyone here done a megaquirt ECU on their XJ?

the 4.0's ECU is stupid awesome for some reason. its untuneable but with an adjustable MAP and AFC you can get it to 95% perfect. the timing adjusts itself pretty well.

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03-11-2010 | 06:58 PM

#17

Testament

Newbie

Joined: Jan 2010

Posts: 25

Likes: 0

From: New Zealand

Model: Cherokee

Quote:

Originally Posted by 93XJLI

the 4.0's ECU is stupid awesome for some reason. its untuneable but with an adjustable MAP and AFC you can get it to 95% perfect. the timing adjusts itself pretty well.

Really? that surprises me, especially about the timing. Have you got some details on this setup? I'm not sure I know what you mean when you say adjustable MAP, I know what a MAP sensor is but i have never heard of an adjustable one - the AFC I presume is some kind off piggyback computer that adjusts the fueling.

Do the standard injectors have enough extra flow?

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