I finally got my car running with the Accel Pro Ram/DFI Gen 7/Wideband 02 sensor.

http://www.youtube.com/watch?v=ojtkjuBAKi8

Could someone offer advice to get me on my feet for tuning this car? Currently you need to hold the throttle wide open for it to start. It runs clean with RPMs, but will not idle and runs very rich.

 

First- I've got 6 (Calmap62).
What does your O2 readout tell you??
My guess is you are rich. Just lean it out down low, and try again. Eventually you should get a good idea from the O2 sensor.

My 383 was way different from the old 383 tune Accel/DFI sent out with the updated software.... WAY leaner.

Good Luck.

 

Thanks for the input.

I have some time today to mess with the car. I should also point out that I'm running the Accel Dual sync distributor.

I forced 36* of timing with the DFI and got the distributor sync'ed with the ECM now. They both show the same. The 02 readings range from 12.60 to low 11s while revving it.

Lots of weird things happening, fans wont run and throw trouble code etc., but before I get myself any deeper I need to figure out why the CTS readings are so far off. Its my understanding so far that these systems heavily depend on the CTS readings.

I bought this system used, and currently am running the same program the last owner used on his 383. It ran good for him, as I rode with him before buying and pulling it all off. He did not have a wideband setup though.

If and when I need to start adjusting mixtures, should it be done in the target table or in the VE tables? My A/F is nowhere near what the system is calling for in the target table.

If it sounds like I'm very green at this, it should. I'm a total nOOb, but with help here and hopefully with some help of a friend thats good at tuning factory GM stuff I'd like to figure this out.

So I guess it goes without saying, thanks for any and all input on this subject!

 

That is WAY rich.
Stoi is 14.7:1. That's what you run cruising.
Full throttle, up top, 12.7-13. (There was a good post on this recently)

One 383 is not another!

I started with DFIs 383 map, big hp on their motor in the 90s. Theyswore it was for 30# injectors, but the map I use is like theirs were 24s. And that only got it running. I am leaner, and way different.
280XFI cam? KB100 pistons? Who knows. If I had not dove in and changed it it would still be sitting.
You have the tools with the O2, go for it.

Oh yes, my timing takes less advance, too.
Try calling DFI tech.

 

You need to find out how the DFI is calculating fuel. Most likely the VE table plays the biggest part in this. You are tons rich. I would multiply the entire VE table by 82% for starters; get the correct timing at idle. OR scale it so thats the lower part of the table is multiplied by 82% and the top part by 100% (no change).

Not only do you need the wideband, but also a scanner. Does DFI have a engine function scanner?

Basically, you tune the idle business first; then the drive around stuff, and lastly WOT. The first two are accomplished by the wide band and the fuel correction fuel cells. You always want to tune so that the correction is zero (no fuel being added or taken away from the fundamental Pulse Width (PW) equation.

What are the correction terms that is used in DFI terminology? For my 3rd gen ECM, its BLM (Block Learn Memory, this is long term) and INT (Integrator, this is short term). The BLM value is available right at start-up. The INT value is set back to baseline (for me, thats the value 128).