454 411 Swap

[joecar]

The GM tables use g/cyl.

A0010 uses kPa for your convenience.

~ posted by phone ~

[Supercharged111]

Well I did the swap and the truck doesn't run. It kinda wants to, but something is WAY off. I stole VE, IFR and and some other useful things from the 2000 7.4 tune and crank/start from the 2001 8.1 as it has the same OS and matched up. The black box was severely lacking in crank/start options. Truck ran fine before the swap, so mechanical is out. It runs pig rich when it runs and requires throttle to keep it running when it runs. No smoke though. I did advise the PCM of the increased cylinder volume so as far as I know this thing should just fire up and drive away. Here's where I'm at at the moment.

Dually Attempt #2 Crank Start From 8.1.tun

[joecar]

If it's rich, try this:

unplug the MAF, start engine, verify you get a MAF DTC... see how it runs, if it's rich, then pull the VE down a little in this area.

[Supercharged111]

I really don't think VE should be to blame here? I had the low reference pin not fully seated for the IAT and MAP causing them both to peg, but the truck doesn't run much better with it seated and reading properly. I held the throttle open long enough to force the truck into closed loop to see if learning would help and it did but very marginally. LTFTs aren't crazy here, but this thing is really unhappy. I'm going to dump in the idle tables from the 8.1 and see if it helps. Once the RPMs climb it free revs much cleaner but it just hates life below 1500 RPM. The exhaust stinks like rotten eggs and there's a good bit of water dripping out of the tail pipe.

Dually Log 2.efi

[Supercharged111]

I'm on my 7th iteration here, the 8.1 idle tables helped some but the idle absolutely sucks and so does tip in just off idle. Once moving, the truck runs fine. I was able to address the overly rambunctious downshifting and added some timing, but I'm apprehensive to give it more because I know big blocks don't like a whole lot and I'm not sure if the knock sensor calibration can be trusted in this state. I need to compare my timing map to stock and see if it's half as aggressive as I thought it was. I'm getting zero KR at the moment. Far more important that that though is getting this idle figured out. I remember I tried a rafig on the 1500 and it claimed airflow was substantially lower than what was programmed and I could never figure out why. I fear I've put myself in the same corner now with this.

Dually Log 5 after downshift speedo and.efi
Dually Attempt #7 Speedo 2-1 Kickdown.tun

[SS2win]

Have you tried the tune I posted HERE? It did really well for me and I'm curious to see how it works for others. The reason I built it was the starter tune Lextech gave me ran pig rich. It's not perfect by any means but my truck has been running it close to a year without much hiccup. I'm just now getting ready to fine tune it bacause gas mileage sux. It does start and run every time though. Only issue I can recall is low range shift out of first occurs at 5500 rpm or thereabouts.

[SS2win]

Also, the biggest problem I had with my tune turned out to be injector scaling. I was running a set of ebay replacements that were originally volvo spec and they threw everything out. I installed a set of FMS 24lbs injectors, did the scaling, and that made the biggest difference in driveability. Other problems I had were due to bad sensors, the distributor was worn out, etc. 230k miles on my beast.

[Supercharged111]

I wanted to, but it's a .ctz file. I did what you did, but had to grab start and IAC stuff from 8.1. I couldn't take all the IAC idle stuff as some of it was clearly geared toward DBW.

[statesman]

Try these changes....

{B4105}... Set all values to 450
{B4108}... Set to Enable

[SS2win]

Sorry I'm on the road or I might be able to supply a .bin ... what are you programming with?