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Yeah I found out that the cranking VE table made little if any difference in this application while troubleshooting. Still would like to know why the 411 had a flat cranking VE table in some...

Few questions regarding a 411 swap in place of a vortec black box PCM.

1.) We can't get the trans to shift out of 1st when the manual t case is in 4wd LOW RANGE. Our initial research says that C2...

Alvin!!! Turns out the truck DOES have a pressure sensor so you are right! All I did was copy the fan AC pressure settings from a tune file from a buddies 06 Silverado with factory fans and voila! I...

I ditched the mechanical fan on my daily driver 2004 Sierra a while back and I replaced it with an electric fan. I used a Taurus or MK VII??? style fan. I initially used this style fan on my turbo...

Well using the tune settings for the fan shared by DrLoch the fan still won't shut off at a MPH threshold like I hoped. It only shuts off once the temp drops below that threshold. Oh how I wish I...

I will get a picture up later. It's a 160*F Tstat. Here's a log sorry I forgot to post one when you mentioned it the first time.

Wonder how I might trick the PCM to think the AC is on. Currently don't have AC but intend to in the future. I can force the fan on and off with the scanner no problem. I just am trying to get the...

Thanks so much for sharing that DrLoch. I haven't had a chance to test anything yet but when I do I'm going to use your fan settings exactly in hopes that I can finally get the MPH shutoff working...

DrLoch: Care to share your tune so that I may see your fan settings? Will you please post your tune or at least a screen shot of the fan settings? I sure would appreciate it. I'm using one fan. Also,...

Thanks for the info. I was hoping that the MPH threshold could simply be used to shut the fan off once you're rolling at a certain speed. Makes me wonder what GM did on their Efans? Did they just set...

Bump.

Can someone please tell me how I can get the "Disable Fan Speed" setting to ACTUALLY shut off my fan on my 411 PCM????

The temp thresholds are the only way I can control my fan. If I hit the...

That makes sense.

What about spark tuning? What's your favorite method?

Thanks again for the feedback!

I made the changes you suggested. I'd like to ask you some questions to help me understand it better:



Was the purpose of changing the BE values to those so...

Thanks for the pointers. I made the changes you suggest for PE. Does this look better??

I'll still have to keep working on the VE table with some more logs and smooth it out.

I've been working on this tune for a while and I'm looking for some people to critique it and tell me what they see.

3 bar SD 411 PCM

This is the latest log and tune I have....


I also have...

My boost gauge also reads vacuum.

If in doubt, tests to rule those issues out would be a good idea. I don't think your issue is with intakes or throttle bodies.

I honestly suspect you have an...

Your VE table is looking much more sane. Still need to interpolate between vertical bounds though.

And like 5FDP said, you really should get a wideband in there to make it easier on yourself. You...

Crank sensor problem maybe? The PCM needs to see that to know the engine is even turning over isn't that correct?

Take a good look at the VE table in that 4.8 tune you posted. Notice that is has no massive flat spots and it is a pretty smooth transition from any one point on the graph to any other point....

The overall VE table just seems odd to me. That massive flat spot where the values are either exactly the same or very close to the same.

Have you looked at this thread? It has a lot of good info...

Figured I'd update this thread with what I did to get oil pressure reading in the datastream. I wired the oil pressure sensor for my 411 PCM just like the 2000 C5 Vette and I can read oil pressure in...

Not a current thread but figured I'd post back and update if someone finds this thread searching.

Firstly, many thanks to those who helped me get a handle on this. Most especially Ron.

The...

Shane:

What's going on with your VE table man?????

It looks like you started to extrapolate the values after converting to your 2 BAR operating system, but forgot to finish it or something????...

I have read that they are basically the same as SD 80 pounders..

https://ls1tech.com/forums/pcm-diagnostics-tuning/1545556-80lb-injector-data-base-tune-4.html

Found this, tempted to try the...