Got the new Turbo Timer/A:F gauge/Battery volts meter this weekend. It is pretty sweet. Very Very small.







It works awesome. And I know I need to verify this at the dyno but the A:F ratio was under 10 the whole time I was at WOT and that is without an ECU with my current mods. I am still buying an ECU but just letting you know that he was showing that I wasn't lean.

 

Also if anyone else has this toy, let me know. I am wondering if there is a way to change the minimum and maximum A:F ratios on the unit. From the factory it will only go as low as 10 and as high as 20 and at WOT I am below 10 but don't know by how much. Anyone know about this?

 

Those A/F numbers you're quoting don't make much sense to me. The O2 sensor gives off a voltage from 0.0 to about 1.0, with lower numbers being lean and higher numbers being rich. This is what the PowerFC displays. Most A/F gauges convert this voltage to the stoich scale (for lack of a better term, it's the number you'd see on a wideband dyno) where higher numbers = lean and lower = rich. It looks like that's what this gauge reads. In that case you're running super rich if you're below 10 at WOT. I've read that most tuners shoot for 11.5 - 12.1. Of course, this is all based on the stock O2 sensor, so take that into account.

-Scott

 

How do you know you're running under 10 if the range is between 10 and 20? Are you manually calculating A/F using the O2 reading? Anyway, I think it's fixed between 10 and 20 so I don't think it can be adjusted, but my manual was all in Japanese so I still don't have a clue on how to use all the features. One thing to note though, I've found the O2 readings to be off from the readings of my PowerFC commander so I have doubts about the A/F meter's accuracy... You would think they should give the same readings since they're both A'PEXi products.

 

That's a freakin sweet little deal there. How much did you pay? Where'd you get it? Where do you plan to mount it? I like!

 

Well it calculates A:F ratio off of the O2 sensor reading. According to the gauge when I am at WOT (10 psi) the reading will go to 10 and flash red (telling me that I am out of it's range). So according to the gauge it is getting enough fuel but I don't know how much b/c the gauge won't show me A:F ratios below 10 (this is why I wanted to be able to change the min. values). Also everyone is telling me that I should be running lean with my mods and the stock ECU. When it is at idle or cruising it is at stoich. A:F (14.6-7) which is good. I guess I just need to compare it to the dyno's A:F gauge.

 

nope, its the other way around. lower number = rich, higher number = lean. its the air to fuel ratio, meaning amount of air versus the amount of fuel.

 

I got it at a local Phoenix shop. The price was $89. I mounted it directly under my AVC-r in the glove compartment. I made it so the glove compartment can still be shut to hide them away. Here is an older pic just showing the AVC-r but you can get the idea where the new little toy goes.