turbo Silverado lean spikes/stumble

[BLK02WS6]

Thanks Joe - I was afraid of that... I don't know if he can pass emissions without the MAF.

[joecar]

Disregard the comment "(if you're using MAF)"...

the 512 g/s limit is in any g/s value inside the PCM, we can see it in GM.DYNCYLAIR and GM.DYNCYLAIR_DMA...

if you hit it (via MAF or DYNAIR) you have to scale.

[BLK02WS6]

E38 doesn't have those pids. Those are in g/cyl anyway - don't I need g/s?

[BLK02WS6]

We made a few hits with no MAF, and it definitely doesn't do the same thing... Scaled the same tune and we will hook the MAF back up.

[joecar]

Disregard the comment "(if you're using MAF)"...

the 512 g/s limit is in any g/s value inside the PCM, we can see it in GM.DYNCYLAIR and GM.DYNCYLAIR_DMA...

if you hit it (via MAF or DYNAIR) you have to scale.

Ok, I was thinking LS1B (512 g/s limit on MAF and DYNAIR), sorry I switch between LS1B and E38 alot...


The E38 does not have this 512 g/s limit on MAF and DYNAIR, but 512 g/s is the maximum value on the throttle sanity tables.

[BLK02WS6]

I wish it was an LS1B... COS5 and good to go! I hate E38! It is definitely hitting something when on the MAF. I'm gonna keep on with this scaled tune and get the VVE worked in and then try the MAF again and see if it hits this wall. The small amount of driving he did last night on the VE with the scaled tune, it looks much better - rich, but much smoother... time will tell. If it would ever stop raining around here so he can drive it more!

[joecar]

When you scale, you also have to look at any table that references airmass (g) on its axis...

you now have to scale the axis, i.e. you have to shift the table contents down.

[BLK02WS6]

Yep, I think I got them all - went through it table by table. I didn't do any trans controller tables though... it seems to shift fine from what he tells me. I read that you may have to do any that reference torque, like the line pressure tables.

[Mean Green Z28]

This is all so foreign to me ... and I'm a foreigner!

Sent from my SAMSUNG-SM-G900A using Tapatalk

[BLK02WS6]

LOL - your just a transplant, not a foreigner