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Unread 09-12-2011, 09:20 AM   #16
PERK
Senior Member
1983 CJ7 
 
Join Date: May 2007
Location: Castro Valley Ca
Posts: 624
Fredrok, I agree with you, there is a wealth of information on OBD2. but, the kit as supplied is OBD 1 based on a '94 4.0

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Unread 09-12-2011, 10:31 AM   #17
fredrok
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1985 CJ7 
 
Join Date: Jan 2005
Location: Golden, CO
Posts: 781
Quote:
Originally Posted by PERK View Post
Fredrok, I agree with you, there is a wealth of information on OBD2. but, the kit as supplied is OBD 1 based on a '94 4.0
Yes, it is an OBD I system and no, you cannot generally adjust timing. However, you CAN adjust timing with a DRB II diagnostic computer (scanner). Not to be confused with OBD II. 2 entirely different animals. I have one. I have advanced my timing 2 degrees from stock setting which is generally retarded 6 degrees by default.

Pics of the injectors I was speaking of earlier and a readout of the DRB scanner connected to my MPFI kit.

Also, as an alternative, because the DRB scanners are hard to come by, you can call Lee or Bernie at Hesco and they will burn you a Unichip to your needs with free tuning programs to download and program until it's fine tuned. They can change fuel and spark maps among other parameters.
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Unread 09-12-2011, 05:56 PM   #18
tombstne
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1982 CJ7 
 
Join Date: May 2007
Location: Chino Hills, CA
Posts: 117
Hey Fredrok, did you have MPI with a 4.2 head then converted to 4.0 head?
I have the 4.2 w/MPI and debating if I want the 4.0 head? Noticeable power? 87 oct gas is a plus.
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Unread 09-12-2011, 06:29 PM   #19
fredrok
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1985 CJ7 
 
Join Date: Jan 2005
Location: Golden, CO
Posts: 781
I did the head and FI kit at the same time. It was also soon after I moved from sea level to 7,400ft so really have no comparison. Sorry.

I built the engine years ago, bored .020 over and milled the deck so my compression ratio was already higher. With the smaller combustion chambers on my 4.0 head, I'm just shy of 10:1 which would be more than a stock configuration. I cannot run less than 91 and that's the highest you can find where I am (altitude). I try like hell to fuel with non-ethanol when able and I occasionally had ping even with the 4.0 head under load going up hill on warmer days (aggravated by the more aggressive camshaft). That all went away when I swapped injectors.
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