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Unread 08-19-2009, 12:37 PM   #1
DUX4LIFE
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1977 CJ7 
 
Join Date: Jul 2009
Location: ILLINOIS
Posts: 392
TOTW Fuel Injection

How much hp gain would be realized by doing this swap? Or is it just a reliability issue? I have a 1985 258. I have the original aluminum intake with all of the smog stuff and an older steel intake without it. Which one would be better? Since all I have are the old 2 bbl and 1 bbl carters that need to be rebuilt I am thinking about going this route. Would a header be of any hp benefit with this scenario? Fuel milage increase? We don't have smog tests in our area so that isn't a conern. Thanks

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Unread 08-19-2009, 12:51 PM   #2
CSP
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Location: Colorado
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How many threads are there on this subject already?

Throttle body injection won't yield more horsepower if your engine is tuned correctly as it sits. If it runs like crap you'll notice a difference.

Multi-port injection will yield horsepower gains, though they won't be huge.

In the end it comes down to drivability, reliability, and if those two items are worth it to you to either spend the money for a kit or invest the time it takes to figure out how to do it yourself and save some cash. It still isn't cheap to do it yourself, but you can save a significant amount and learn something in the process.

Lots of info has already been posted here and on the rest of the web.
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Unread 08-19-2009, 02:18 PM   #3
DUX4LIFE
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Thanks, right now My engine is on a stand and the frame is painted. Adding things as they are being cleaned up and repaired. All I have is 2 old carbs and 2 diferent intakes. The carbs need to be rebuilt and I ain't a carb man. The write up on the injection was pretty stright forward and seems to be very affordable if I do it myself. Thats the way I am leaning towards. But when I started this project I wanted a simple uncomplicated jeep from the 70's. I may have to adapt though. FI seems to work pretty good when it is working.
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Unread 08-19-2009, 04:38 PM   #4
Mike Romain
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The kit for the 2BBl carb is only about $20.00 and is easy to put in.

You can also easily kill the computer and get a nice HP increase as well as over 20 mpg with all your stock stuff still.

Here is one writeup on killing the computer: http://www.jeepforum.com/forum/f8/ho...bypass-522262/
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 08-19-2009, 08:58 PM   #5
DUX4LIFE
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Should I ditch the 1bbl and use the 2bbl that came with the 1985 engine or both and get another carb? Also should I ditch the steel or aluminum factory intake?
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Unread 08-19-2009, 09:42 PM   #6
Mike Romain
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Posts: 13,778
The 2BBl and aluminum heated intake from the 85 work great.
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Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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