CALC. VE Problems

[1bar]

Hello,

I took my latest tune, read through the Calc VE pages and Calc VE tutorial, and changed my tune in accordance to run and tune via Calc VE.

I flashed in the new tune and now the car will not start and run. The car will turn over, grumble for a minute and die. If I step on the gas pedal to help there is no difference.

I've attached my tune I used before the Calc tune and the tune that became my Calc tune.

Any ideas?Calc VE_0000.tunBase 427.tun

[n8dogg]

One thing that really jumps out is the Main VE table... You should get rid of the spikes. I am not 100% sure if that's your problem, but it may be a place to look. Try process of elimination. Copy and paste your old VE table in your new tune and see if it starts. If it does, then your VE table needs work.

[1bar]

N8,

I've begun doing this, but the changing the VE did not get the car to run. I'm going through one by one to see where the problem occurred.

[WeathermanShawn]

Hi 1Bar:

You made a couple of very significant errors. First, you need to be in closed-loop. You need B4205 to be stock. You never entered closed-loop with your settings.

Secondly, and most importantly you must have the MAF Enabled to do CALC.VET. C2901-C2903 is set to 1..that fails the MAF...You MAF must be enabled.

Your car grumbled because it was in Open-Loop SD..and was using your VE Table..which appears to need some work. CALC.VET is a MAF-driven Tune and must be performed in closed-loop to work!

[slows10]

It would probably benefit everyone if the guys that look for help have a signature listing what they drive and the modifications done to it.

[joecar]

1bar,

since you're OLSD you want the AutoVE tutorial...

you could do the Calc.MAF tutorial with wideband only and ignoring the calculated MAF (which is what AutoVE tutorial is).

[WeathermanShawn]

It would probably benefit everyone if the guys that look for help have a signature listing what they drive and the modifications done to it.

Thats a great idea!

[1bar]

Hello Everyone,

Thank you for the replies. The car is a 2000 camaro, COS3, OLSD tune, 7L TT motor, six speed car. The car has two pumps in the tank, return style fuel system WITHOUT boost reference attached, and 60 lbs mototrons. I haven't spent time tuning the car in a while. I knew my tune has been rough for a while and I wanted to get some of the spikes in my VE figured out so I logged on and saw the Calc VE and began reading about tuning with EQ instead of AFR and so on. I also want to be able to tune both in and out of PE.

I did the B9021 transient cax and the Calc VE turtorial suggested tune changes all at once and the car wouldn't start so I backed up and just did the B9021 cax first and the car started but surged hard at idle. Bouncing from 14.1 AFR to 17.1 AFR. Then one by one I adjusted the small pulses adj, min inj pulse, and default min inj pulse so that the car would idle again.

Then I started adding in the Calc VE adjustments and noticed that when I changed B0120 from 4000 to 400 the car did not want to start. I left B0120 @ 4000 RPM and changed all of the other Calc VE adjustments. The car started up and idled fine after I did all of the other Calc VE adjustments so I went back and tried adjusting the B0120 one more time from 4000 to 400 to see if it would run. On the third try the car fired up. Really weird.

The car now runs and idles fine at normal operating temps. I have no clue what it will do at cold start. I only mess with the car on the weekends so next weekend I will watch cold starts.

At this point what method do you guys suggest to auto tune the car?

Thank you,
Glenn

[joecar]

OLSD = can't do Calc.VET (your MAF is failed).

OLSD = can do: AutoVE and/or Calc.MAFT.

[1bar]

Hello Joe,

Which is better, Auto VE or Calc MAFT?