Vitesse MAF voltage vs rpm and AFR?
03-25-2012, 06:08 AM
#1
Racer
Thread Starter
Vitesse MAF voltage vs rpm and AFR?
Has anyone logged the MAF-voltage from a Vitesse system?
I'm still having issues with the AFR at no load and a log of the AFR vs. rpm, boost, TPS etc. shows MAF-voltages that to me seem a bit high, see attached picture that is taken at 2500rpm (MAF-voltage is on User1)
I also checked the the MAF ground voltage at these conditions and it was app. 30mV so that is not a problem.
/Dea
I'm still having issues with the AFR at no load and a log of the AFR vs. rpm, boost, TPS etc. shows MAF-voltages that to me seem a bit high, see attached picture that is taken at 2500rpm (MAF-voltage is on User1)
I also checked the the MAF ground voltage at these conditions and it was app. 30mV so that is not a problem.
/Dea
03-25-2012, 12:02 PM
#4
Racer
Thread Starter
I have already gotten help from John although it was bought used, so I want to test the forum first.
It's not at start up, what's wrong with the boost reading?
/Dea
It's not at start up, what's wrong with the boost reading?
/Dea
03-25-2012, 02:32 PM
#5
Rennlist Member
So you are telling me, he does not support products that are purchased used? I can understand giving the used buyer the option to register as the new owner for a small cost and then providing them the same support as original buyer. Hopefully, there are no support issues.
03-25-2012, 03:10 PM
#6
Three Wheelin'
So you are telling me, he does not support products that are purchased used? I can understand giving the used buyer the option to register as the new owner for a small cost and then providing them the same support as original buyer. Hopefully, there are no support issues.
03-25-2012, 07:58 PM
#7
Rennlist Member
I have called BIG companies and small mom and pops no issues there. And i have told them its second hand.
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03-25-2012, 09:41 PM
#12
Did you try adjusting the FQS rotary switch? I am assuming you have a chip board and the FQS switch just bumps up/down the % of fuel. If it is a EPROM, all bets are off on what the FQS switch is doing. Looks like if you take away 5%, your AFR will be better.
03-26-2012, 03:58 AM
#14
Pro
I have the Vitesse MAF and ZT-2, but I haven't done any logging yet. I have watched the AFR's extensively, but only once have I measured the MAF output voltage and I don't remember off the top of my head what it was. Here's all I can tell you:
1) At no load, the AFR vs. RPM curve seems consistent with mine.
2) Once I got my grounding issues sorted, my AFR's were too lean. I had to adjust my FQS switch to compensate. I tried FQS number three first (+6%), but on boost my AFR would drop into the 10's. I backed it off to FQS number one (+3%), and now my AFR's are 14.6-14.7 idle, 12.7-13.1 cruising (no boosting, very low load), and always right at 11.5 on boost.
My recommendation is to go to FQS 1 and post the log. If you need me to measure the MAF output voltage for reference, please just remind me which wires to probe and I'll get a visual on it for you.
1) At no load, the AFR vs. RPM curve seems consistent with mine.
2) Once I got my grounding issues sorted, my AFR's were too lean. I had to adjust my FQS switch to compensate. I tried FQS number three first (+6%), but on boost my AFR would drop into the 10's. I backed it off to FQS number one (+3%), and now my AFR's are 14.6-14.7 idle, 12.7-13.1 cruising (no boosting, very low load), and always right at 11.5 on boost.
My recommendation is to go to FQS 1 and post the log. If you need me to measure the MAF output voltage for reference, please just remind me which wires to probe and I'll get a visual on it for you.
03-26-2012, 09:45 AM
#15
Nordschleife Master
He is indicating in mm Hg, not PSI...
Seriously guys? Not only has this discussion been beaten to death, but is totally off subject...
ON subject, OP, I answered you on another forum, but will answer here as well..
FWIW, you are only .4V above your no load idle MAF V reading... not terribly bad, but I will cross check it for you this evening.
I have on my laptop at home logs from both a Vitesse system and a non-vitesse system, on 2 seperate cars, simmilar enough in setup to be points of refference for you, and insrumented identical to yours... I will check their logs when I get home, and post results.
ALSO, for refference, can you post a WOT high RPM log point just for cross refference to the other logs?
So you are telling me, he does not support products that are purchased used? I can understand giving the used buyer the option to register as the new owner for a small cost and then providing them the same support as original buyer. Hopefully, there are no support issues.
ON subject, OP, I answered you on another forum, but will answer here as well..
FWIW, you are only .4V above your no load idle MAF V reading... not terribly bad, but I will cross check it for you this evening.
I have on my laptop at home logs from both a Vitesse system and a non-vitesse system, on 2 seperate cars, simmilar enough in setup to be points of refference for you, and insrumented identical to yours... I will check their logs when I get home, and post results.
ALSO, for refference, can you post a WOT high RPM log point just for cross refference to the other logs?