Dea_944t

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

carlege

i would send Vitesse an email/pm.

reno808

your boost reading is a little off. is this done at start up?

Dea_944t

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

RajDatta

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.

Scott H

Yes and no. The number of different configurations, revisions, crappy install/removal from POs, missing documentation and even wire condition on the car all make the troubleshooting process difficult and time consuming, especially over the phone or via e-mail.

reno808

I have called BIG companies and small mom and pops no issues there. And i have told them its second hand.

ChrisJ951

The boost reading is showing a vacuum and not a boost level.

carlege

isnt it suppose to because its idling?

ChrisJ951

Yes, if he is at idle.

ChrisJ951

Duh, didn't see the RPM of 809.

Bri Bro

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.

Tom M'Guinn

Does your car have a closed loop O2 system? I seem to recall some markets didn't...?

jmj951

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.

JohnKoaWood

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?