Search:

In the end, I determined that it was an OS compatibility issue between the 2007 Silverado (E38) ECU and 2008 Express Van (T42) TCM that couldn't be resolved without using the OS from the 2008 ECU...

Hey Greg, been a while since I posted so glad to see you are still out there! As always I value your input and suggestions.



All stock -- no lift kit, stock wheels/tires

I'll take a look...

The truck has 85K miles on it and suffered a collapsed lifter on cyl 7. I did an AFM/DOD delete with an L86 cam. The owner (friend of mine) has told me for years that the truck has always...

Have you tried running MAF only to see if it still behaves that way? From the picture, the MAF looks relatively consistent through the surge/stall scenario while the VE is jig sawing. It may be...

I dug up my notes from the swap. Should be some useful info in there...
87909

My apologies, that's what I get for responding before I've had my coffee.

It probably wont help, but I also set the COT enrichment factor to 1.0 because I've been burned by the enable/disable...

Since its exhibiting the same behavior on both banks, it may be worth a shot to disable COT and see what happens (with no cats you should probably disable it anyway) Also, may want to add the closed...

Thanks for the suggestion. I did try the reverse test early on and I can produce the same exact results in reverse. I have also run overlay circuits for every speed sensor related wire I can find...

Bump... Nobody has seen this? I was hoping that since so many people have done the 4L80E swap on these trucks with the 08 Express VAN TCM this would be common but I guess not?

Any help or advise...

The tune from post #4 looks much better from the startup airflow perspective. Have you tried further reducing the Cranking VE ? Maybe try by reducing 5% at a time across that table and see what...

Support suggested I post here to see if any tuners have a suggestion or have run into this. The engineer reports the code is working fine so it "must be in the tune"

I have posted over on...

Magnaflow 99509HM

I run a turbo with cat. Removed the 2 stock cats for the turbo setup and now run a single 3" SUV size aftermarket CAT. I actually put the downstream O2 sensors in bungs right after the cat just for...

I suspect Torque Management is at work. As a test, try setting your

Spark -> Advance -> Spark Limiters ->Spark ramp out ->Spark Minimum TqMgt table to something like 10 degress at running temps. ...

My IPW is not as linear as I'm seeing most of you run. I have my FPCM setup to increase line pressure to 60psi for anything over 80 lb/hr flow rate. As a result my IPW drops back down a bit. I've...

If you do scale everything in the tune you may want to watch the resultant Delivered Torque. Not sure where these are in the E40, but in the early E38 ECUs its important to calibrate your Delivered...

Just another small update in case anyone else can benefit from it.

I came across a few air straightener threads using the saxonpc honeycomb device. I got the 8:1 and installed about 5 inches...

again...love this sheet. Awesome piece of collaborative work!

So, I've got an ISKY cam and they measure at .007 instead of .006. On the input sheet, cell D2 does not appear to be referenced...

Sounds like the MAP sensor. Easy way to check is to back probe the sensor with a fluke with key on engine off. If its a true 2 bar MAP, you should be right around 2.5v at barometric pressure (~100...

Maxspeed96ct, I'm currently driving a 2007 Silverado Long bed (blue). There dont seem to be many people on this forum from this part of the country so good to see someone in the neighborhood. Drop...

My experience has been that the best you can do at guessing is just that...a guess (unless you know someone with an identical setup who you can borrow it from)

Tubing diameter, bends in the...

Great work here! (talk about the lazy man's approach to a fairly complex topic... You guys nailed it!)

I spent a few hours "test driving" the sheet. I tried various examples and the one that is...

After many wash, rinse, repeat cycles of fine tuning Speed Density with my VVE, I've concluded that my idle surging was in fact caused by my airflow model being way off. Once I got that much closer...

Not sure what part of the country you are in to guess at ambient temperature for your "cold start" but just looking at the tune, someone has messed with the Idle->airflow->startup->startup airlfow...

With MAF disabled or do I need I need to enable it and include in my maths? I guess I'm just not seeing how you can derive dynamic air by using dynamic air itself in the equation? As far as I can...