High VE for idle?

[Not a 350]

I am tuning a friend's car and am finding very high VE numbers in order to find reach my target A/F ratio. I'm seeing 78 at idle and >100 in some part throttle areas.

What could the problem be? As far as I know, all of the base fuel calc parameters are correct.

Also, under the DOS version of C-com, I can't set VE higher than 150. Is there a restriction in the DOS version?


Thanks,
-Aaron

 

[TurboTR]

Sounds like the inj size number is incorrect, either because the wrong size is entered or the fuel pressure is not ~ 3 bar.

TurboTR

 

[HighPSI]

Could be the injector opening time. If the car is operating on a 12 volt system, I usually set it at 1.0ms

 

[Not a 350]

The injectors are 72#. If the VE is higher then it should be, thus adding fuel, that means that these injectors may not be true 72# injectors then?

The fuel pressure is at 43.5 psi with the vacuum hose off and the injector opening time is 1.0ms

Thanks,
-Aaron

 

[Not a 350]

We put in a known set of 83# injectors, double checked the MAF and fuel pressure, and retuned the car. Now it wants to idle at 95 VE. The exhaust smells fine and the car idles smooth so I don't think it is a bad O2 or anything like that. If I lower the VE the car goes lean quick and dies around 75 VE.

The FAST calculates fuel from the following, right?

VE
CID
# of cylinders
Injector size
MAP

I have checked them all and it is still running weird. I even loaded a tune from another car to make sure there wasn't some hidden value mucking things up. What is going on?

The car idles at 51 VE when I doubled the CID in the FAST, but I don't want to band-aid the tune like that. Please help.

-Aaron