So, we spent the whole day tuning my car yesterday...

reeber

10 Year Member

Mar 10, 2004

574

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38

Berlin, NJ

Aug 16, 2005

#1

• Aug 16, 2005

• #1

We replace 2 MAF meters without any success. We data logged each run and found that the computer is not reading the MAF correctly. The loads are all over the place and the computer is putting way too much timing into the car. At full throttle, my load should be at about 250%, but it jumps from that to 40%, 100%, etc... Every time the load drops, the computer puts timing into the car making it extremely dangerous. We swapped the MAF sensor out twice and it does the same thing. So, it's not the meter. We are stuck... I have DiabloSport here from Florida and we're all having issues. Anyone ever run into this problem?

 

jstreet0204

Active Member

Jun 26, 2003

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Winston Salem, NC

Aug 16, 2005

#2

• Aug 16, 2005

• #2

That sounds like a tough one. Do you know if all of the load dependent tables were re-normalized to allow greater than 100% load. Probably so, but something to check. It might be that the eec is bad.

 

reeber

10 Year Member

Mar 10, 2004

574

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38

Berlin, NJ

Aug 16, 2005

#3

• Aug 16, 2005

• #3

all the slopes were calculated correctly.. We checked numerous amount of times. We took out the computer and tested that as well. It has been updated, but wouldn't have anything to do with the load readings. I am stumped...

 

BooWFO

New Member

May 10, 2005

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Louisville, KY

Aug 16, 2005

#4

• Aug 16, 2005

• #4

ok stupid ? time have you checked to verify the wiring to the MAF is still good? All wiring back to the eec is good right? Or maybe a chassis ground seen them make all kinda things act funny. Also you said you tried 2 MAF are you sure they are ok? My buddy had 2 driveshafts in a row that were outa balance so $hit does happen.

 

jstreet0204

Active Member

Jun 26, 2003

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Winston Salem, NC

Aug 16, 2005

#5

• Aug 16, 2005

• #5

Did you datalog MAF voltage with load, and if so does the voltage coincide with the load?

 

reeber

10 Year Member

Mar 10, 2004

574

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38

Berlin, NJ

Aug 16, 2005

#6

• Aug 16, 2005

• #6

We did briefly check the wiring to the MAF. Nothing looked frayed, or disconnected. We even took a 90MM MAF out of a lightning and it had the same problem. I doubt that 3 MAF's were bad. Then we thought it was the computer we were using. So, we hooked it up to another car in the shop. That car's load numbers were dead on. So, the computer works. Maybe we need to go deeper into the wiring issue and follow it all the way to the computer and see what we can find.

 

reeber

10 Year Member

Mar 10, 2004

574

26

38

Berlin, NJ

Aug 16, 2005

#7

• Aug 16, 2005

• #7

jstreet0204 said:

Did you datalog MAF voltage with load, and if so does the voltage coincide with the load?

Click to expand...

Yeah, we did datalog the voltage with load, but the load was so all over the place compared to the voltage. Every dyno pull showed completely different comparisons. The voltage never coincided with the load percentage.