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Unread 06-17-2013, 09:30 PM   #1
jasonjones21
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1989 YJ Wrangler 
 
Join Date: May 2013
Location: fontana, ca
Posts: 236
Tbi conversion yj

Is it worth the upgrade to do a tbi and get rid of the carter carb or should I just do a 318 swap? Money and mpg difference

Thanks

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Unread 06-17-2013, 11:18 PM   #2
greyarea
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1990 YJ Wrangler 
 
Join Date: Aug 2009
Location: gwinett, GA
Posts: 293
I can say it is well worth it for a junkyard tbi swap. I would say not so much for a Howell or AFI setup. That being said I am in the middle of a 5.2(Magnum 318) swap after running TBI for a few years. After TBI the old 258 with a 4.0 head would rev to 4500 smoothly and make what little power it could all the way up.
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Unread 06-17-2013, 11:25 PM   #3
timatoe
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1990 YJ Wrangler 
 
Join Date: Aug 2006
Location: Grass Valley California
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Being that you're in CA, I would highly recommend doing the Howell TBI. You only have a few options out here to still be smog legal.
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Unread 06-17-2013, 11:35 PM   #4
jasonjones21
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1989 YJ Wrangler 
 
Join Date: May 2013
Location: fontana, ca
Posts: 236
Ok I will be moving out of ca real soon to a smog exempt state so which is better tbi or 318 swap thanks
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Unread 06-18-2013, 10:25 AM   #5
NonRubicon
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1990 YJ Wrangler 
 
Join Date: Nov 2009
Location: The southern armpit of California
Posts: 2,098
Can't compare the 4.2 w/tbi to a 318, but compared to the carbed 4.2, the tbi upgrade is a vast improvement in performance and power. MPG didn't really change for me.

With that said, you are trying to compare a I6 with a V8. "Better" is quite subjective and depends on your criteria.
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