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F.A.S.T. Injection for Jeep 4.0
Posted: November 11th, 2014, 3:04 am
by str8-6
I'm not sure if this has been covered here but I just found this:
http://www.onallcylinders.com/wp-conten ... 0x1200.jpg
Re: F.A.S.T. Injection for Jeep 4.0
Posted: November 11th, 2014, 2:14 pm
by Jpross
Not sure what you are pointing out honestly without doing my own research. Whats up? It looks nice

Re: F.A.S.T. Injection for Jeep 4.0
Posted: November 13th, 2014, 12:52 am
by str8-6
For a moment I tought that FAST had a new intake manifold of their own but when looking a bit closer it seems to be a stock one just for displaying their injection stuff.
Re: F.A.S.T. Injection for Jeep 4.0
Posted: November 15th, 2014, 4:08 am
by BADASYJ
That doesn't look like a 4.0 intake at all. Looks as if it's a stock 4.2 intake. It would be much better suited on a intake designed for a four barrel carb.
Re: F.A.S.T. Injection for Jeep 4.0
Posted: November 15th, 2014, 7:47 am
by SilverXJ
4.2L carb intake. Throttle body injection. $1400? What a waste of money.
Re: F.A.S.T. Injection for Jeep 4.0
Posted: November 15th, 2014, 9:47 am
by jsawduste
Not even shiny........
Re: F.A.S.T. Injection for Jeep 4.0
Posted: November 16th, 2014, 12:57 pm
by Jpross
btw, I did research it... couldn't find much except this, advertising the throttle body for 4.2s. From what I can tell it converts a carb setup to fuel injection.
http://www.summitracing.com/search/prod ... ottle-body
Re: F.A.S.T. Injection for Jeep 4.0
Posted: November 16th, 2014, 2:59 pm
by jsawduste
The 4500 class guys from Colorado (Rants) use it on there Scrambler.
Heart of the system is a WB O2 that sends signals to a pre programmed ECU. Very limited amount of adjustability for both fuel and spark. The ECU is smart enough to keep the AFR in the "safe" zone. At least what it thinks is the safe zone. Beyond that, well..........
A JTEC set up with the right tune is far superior.