Maf
Race Director
Joined: May 2006
Posts: 10,691
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From: Phoenix Arizona
Just curious, why would you want too? It would be difficult and expensive, you would probably need to go with 94-95 wiring and computer, they use both MAF and MAP and a better computer (96's use OBD2). The earlier L98 systems would be worse as far as tuning.
Thread Starter
Instructor
Joined: Feb 2010
Posts: 175
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From: radford virginia
the reason i was wanting to switch or add maf is because i have a 383 with a 306 cam and the cars vacuum droped from 18 to 11 due to the cam. so the map sensor is adding too much gas because the vacuum has droped. i was told the car would be able to adjust itself better with maf
Safety Car
Joined: Jan 2004
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Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
Thread Starter
Instructor
Joined: Feb 2010
Posts: 175
Likes: 0
From: radford virginia
i called pcm for less and they told me to datalog it but when i told them i had trouble connecting to the computer they said to fix that problem first because they have never messed up on a tune before
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on the 306 cam ;fresh air is going out the exh
and fooling the O2 sensor into thinking engine is lean so it adds more fuel trying to correct
a problem that isn't there
Worse at idle and low revs; makes your eyes water @ idle is common comment
Some have had to tune for open loop to overcome this problem
Thread Starter
Instructor
Joined: Feb 2010
Posts: 175
Likes: 0
From: radford virginia
I also suspect that rather than MAP fueling your problem may be that with the big exh overlap
on the 306 cam ;fresh air is going out the exh
and fooling the O2 sensor into thinking engine is lean so it adds more fuel trying to correct
a problem that isn't there
Worse at idle and low revs; makes your eyes water @ idle is common comment
Some have had to tune for open loop to overcome this problem
on the 306 cam ;fresh air is going out the exh
and fooling the O2 sensor into thinking engine is lean so it adds more fuel trying to correct
a problem that isn't there
Worse at idle and low revs; makes your eyes water @ idle is common comment
Some have had to tune for open loop to overcome this problem
Thread Starter
Instructor
Joined: Feb 2010
Posts: 175
Likes: 0
From: radford virginia
I also suspect that rather than MAP fueling your problem may be that with the big exh overlap
on the 306 cam ;fresh air is going out the exh
and fooling the O2 sensor into thinking engine is lean so it adds more fuel trying to correct
a problem that isn't there
Worse at idle and low revs; makes your eyes water @ idle is common comment
Some have had to tune for open loop to overcome this problem
on the 306 cam ;fresh air is going out the exh
and fooling the O2 sensor into thinking engine is lean so it adds more fuel trying to correct
a problem that isn't there
Worse at idle and low revs; makes your eyes water @ idle is common comment
Some have had to tune for open loop to overcome this problem
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
heavily on accurate feedback from the O2 sensor and if O2 is being "fooled" into thinking engine
is lean when it is not......................
As noted
many with your problem get the tune done Open Loop @ idle only
where it has fixed fueling like a carb engine and does not rely on interacting with the O2 sensor
http://www.hotrodders.com/forum/-124...nglepost8.html
http://www.thirdgen.org/techboard/di...op-tuning.html
http://www.thirdgen.org/techboard/di...questions.html
Last edited by vetteoz; Jan 24, 2012 at 09:01 PM.