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General Forums => The Mess Hall => Topic started by: skmorse on February 04, 2007, 09:51:36 PM

Title: 1990 YJ 2.5 L TBI
Post by: skmorse on February 04, 2007, 09:51:36 PM

Like most 2.5 L owners I could use a couple more HP.  I am confused about being able to use a TBI spacer on the 1990 engine as every thing I read lists 1991 and newer.  I see from the forum that the gasket is different shaped from that on the 1991 +.  Do I need to change out the TBI with one from a 4.0 L or can I just use one of the spacers that are on the market?  I have seen some places where they say yes and others where they clearly take about 1991 and newer.  This 1990 is my first jeep and I have been doing a lot of reading and I am confused.

Title: Re: 1990 YJ 2.5 L TBI
Post by: schmitty1990 on December 15, 2007, 01:44:09 PM

yeah, i have the same problem. does anyone know?

Title: Re: 1990 YJ 2.5 L TBI
Post by: Jeffy on December 15, 2007, 02:30:03 PM

No one makes a TBI spacer.  So you'll either have to make one yourself or go a different route.

Title: Re: 1990 YJ 2.5 L TBI
Post by: schmitty1990 on December 15, 2007, 05:08:42 PM

what do you suggest for engine power upgrades. i already did an exhaust. but i cant find anything for my TBI.

Title: Re: 1990 YJ 2.5 L TBI
Post by: Jeffy on December 15, 2007, 11:59:00 PM

Well, if you really want MPFI and a realistic 12hp gain then you could do a conversion.

Otherwise, stick with the basics, ignition, air, fuel and gearing.

Making your own TBI wouldn't be that difficult.  You'd need a billet and a drill press.