Supposedly the AVC-r monitors fuel injector duty cycle %, right? I hadn’t really looked at it that close on the unit but I noticed it whenever I was showing someone the unit this weekend. So when I went home I made it show me this reading. Now I have been told that if it shows higher than 90% that I am out of the range of the stock fuel injectors and I am running lean. I understand this principle fine. What I don’t understand it why when I would hit the gas my inj. % would go down. At cruise speed it was showing around 80-85% but when I hit the gas it would lower to around 75% at some points. At idle it was showing around 96%. I went for a ride in another RX-7 with the AVC-r and his car was doing the opposite. When he was at WOT his AVC-r inj. % was going all the way to 100% at WOT (sometimes). Now he does have an aftermarket ECU but I am just confused why his would go up at WOT and mine goes down. Anyone know anything about this.

thanks in advance

 

Bzzzump

 

Mine is like this also..anybody else?

 

Your inj. % is increasing or decreasing when you accelerate?

 

I have the older AVC-R (1/4 din size) and the injector duty display works perfectly as far as I can tell.

Are you sure you tapped into the correct ECU wire when the uint was installed?

 

Well according to the manual the same wire is for the RPM or fuel injector %. If you tap into the RPM on the ECU then you get that, if you tap into the inj. % you get that reading. When I installed it I tapped into the RPM so I could get the RPM specific programming available. But I would think that if that wire is now reading RPM's why am I even seeing a inj. % number. To me it seems that it would just read nothing instead of showing the % dropping on acceleration.

Any comments on this. I'm stumped.

 

I knew someone with the newer AVC-R and remember reading that you gotta choose injector-duty or RPM. Since you chose RPMs, the injector-duty will most likely display garbage data since you aren't actually tapped into that wire.

Does the unit have an option where you tell it which ECU wire (INJ or RPM) you used? Maybe you just have to tell it and then it will disable the INJ display option.

Anyway, if you didn't tap into the RPM wire on the ECU, the INJ data displayed by the AVC-R can only be garbage, so I would even look at it.

Good luck...as I recall, the newer AVC-R has some really cool features you can use if you go with the RPM wire. Have fun.

 

Well what made me think about it was I was just riding with someone this weekend and he had an AVC-r as well. I forgot to ask him what wire he tapped into though. But his inj. % was increasing on acceleration. He would hit 100% sometimes (with aftermarket ECU). so that is what made me wonder.

 

bump

 

mine also drops (from about 86-94 at idle) when accelerating. good question. i always wondered this myself, but never saw another one hooded up and thought this was normal. now you got me curious

 

Unfortunately either not too many people understand the AVC-r or not too many people own it b/c everytime I ask a question regarding it, it frightens people. And I guess for good reason.

 

 

If you connect the AVC-R wire to the injector signal, you will have both injector duty and RPM functionality. I accidentally connected mine to the "RPM" wire when I installed it the first time and it just gave RPM functionality and read 66% injector duty all the time.

Injector duty should be low at idle and high at high RPM & boost. The meaning of a reading like "45%" is that the injectors are open 45% of the time.

Unfortunately, my AVC-R seems to read spikes which fouls up the peak/hold functionality. But it does seem to read correctly most of the time.

-Max

 

But somewhere I read in the manual that if you don't connect to the RPM wire then you will not have some of the self-learning features and/or some of the RPM specific features on the AVC-r. So I have read anyway.

 

i just finished installing my AVC-R and i hooked up the RPM wire. Im getting the same result in injector duty as mr_jonboy. other than that, the cars running tip top. im asuming the reading im getting from the injectors duty is BS. more info on this would be greatly appreciated though. im curious to know what settings you guys are running and how affective they are. also anybody know a place on the web where people are posting thier specs on thier AVC-R?