Truck falls flat after 3000 rpm.

[joegreen]

I measured the lift of each cam lobe that's how I know my cam is worn. I am going to replace it but right now this vehicle is my daily. Here are the numbers I measured.

[joegreen]

I see the ASDU bin mentioned alot in various posts and forums as a recommended starter bin. Should I be using that instead of AFBW? I chose AFBW because the tbi system I pulled off a 1987 k30 with 5.7 had that bin in the ecm. I figured it would be the closest stock tune for my 1978 k20 with 5.7. If i do go with ASDU can I still control the th400 kickdown. I see in the long list of bins for the 7747 that some are for 3 speed auto and some are for 4 speed auto and some are for manual. Can I only use the 3 speed auto bins? How can I tell if a bin has closed or open loop idle?

[mmigacz]

I see the ASDU bin mentioned alot in various posts and forums as a recommended starter bin. Should I be using that instead of AFBW? I chose AFBW because the tbi system I pulled off a 1987 k30 with 5.7 had that bin in the ecm. I figured it would be the closest stock tune for my 1978 k20 with 5.7. If i do go with ASDU can I still control the th400 kickdown. I see in the long list of bins for the 7747 that some are for 3 speed auto and some are for 4 speed auto and some are for manual. Can I only use the 3 speed auto bins? How can I tell if a bin has closed or open loop idle?

The ECM will only be controlling the kickdown relay. The other parameters relating to torque converter locking and unlocking will be disabled. In other words, it doesn't matter if its a 3 or 4 speed. Not that long ago I found a good thread on how to do this. I posted it at the bottom........Look at the table open loop - rpm threshold. If the values listed in there are unattainable, the bin is set for closed loop idle. The ASDU should work (with modifications).................................... .................................................. .................................................. .................................................. .................................................. .................................................. ..........................http://www.thirdgen.org/forums/diy-p...47-8746-a.html

[joegreen]

When i look at the open loop rpm threshold table it has an idle off rpm and an idle on rpm. When you say unobtainable do i set them both to zero rpm or 10,000 rpm to lock out open loop idle?

[mmigacz]

Set idle off to 25 and idle on to 50.

[mmigacz]

Set your TCC parameters like I show in the attached picture. The parameter that is circled is the one you want to play with. Currrently, it will energize the solenoid (and downshift) when the throttle percent reaches 85%. Change it to whatever you want.

[joegreen]

Im going to try out the ASDU bin and see how that goes. I was tuning ve before by combining table 1 and table 2. I know its user preference but i thought i read something about leaving some values in table 2 because some other table or something looks at table 2 and if its zeroed out it cant read it, idk. Can i still tune using daves excel spreadsheet by just using ve table 1 and leaving table 2 alone. Also why does ve table 2 go up to 6400 rpm when ve table 1 only goes up to 3200 rpm? Thanks for everyones help so far.

[joegreen]

Here is the adx and xdf i am using. I do not see any of those tcc controls. Here are some pics of what i have. Does the th400 tcc coast tps% control the kickdown?

[mmigacz]

Im going to try out the ASDU bin and see how that goes. I was tuning ve before by combining table 1 and table 2. I know its user preference but i thought i read something about leaving some values in table 2 because some other table or something looks at table 2 and if its zeroed out it cant read it, idk. Can i still tune using daves excel spreadsheet by just using ve table 1 and leaving table 2 alone. Also why does ve table 2 go up to 6400 rpm when ve table 1 only goes up to 3200 rpm? Thanks for everyones help so far.

I'm not sure why GM set the 7747 up this way. It would make more sense to have one VE table that goes up to 6400RPM.....I'm not sure if I understand your question, but you can 0 out the adder table. The ECM will use the values from the VE1 main table 3200 row for all RPM's higher than 3200. If you need to richen things up after 3200RPM, you can use the cells in the adder table (3600-6400) to richen up the mixture at higher RPMs.

[joegreen]

There is a scalar for stoich afr that says 14.7 for E0 fuel and 14.13 for E10 fuel. Right now that scalar is set at 14.7. Should i change that to 14.13 because all fuel seems to be E10 unless specified E0 at the pump? Would my ve tables actually be off if i left the stoich afr at 14.7? When you hover over scalars or tables in the parameter tree sometimes a box pops up telling you what that parameter does. The box dissapears after a few seconds. In order for me to read them i have to keep hovering over them to get the text box to pop up. I know there is a way to keep the text box open im just not sure how to do that and its driving me crazy. Does anyone know how to keep the text box open? Also is there a way to change the temperature reading from Celsius to Fahrenheit? I have to keep going to google to convert and it gets annoying.