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I installed a trans go hd 2 in sept. Everything seemed fine. The other nite I went to race a 5 speed truck from a 40 punch. (he swore he could get me. got him by three easy) So I pulled it down to 2nd and mashed it. Downshifted great but jumped into third before I shifted it. Its still untuned. I thought with the kit i could hold any gear till any rpm? Am i wrong?
60e or 80e?
I've noticed that my 80e, under certain throttle conditions and speeds can override my gear command.
It usually works but for example under very slow acceleration it can leap from 1 to 2 with the shifter in 1st.
There are a lot of things in the tuning that don't like shift kits. TM occurs too late, adaptive shift tires to slow everything down then registers slip when you get heavy on the pedal the next time and the trans gets grabby with its gears.
I still need to get mine tuned, hopefully that will help. Otherwise I've had really good luck with the kit and with the gearcommand feature.
If you hold it in low can you hit the rev limiter? That's a pretty sure way to tell if its at least capeable of holding gears.
Mine had me install a plug in the manual valve passage but if you have a 60e it might be different.
Its a 60e. I havent really messed with it but I hope nothings going wrong.
How much better does it shift after the shift kit?
Maybe it sensed it was operating outside of parameters and entered some kind of limp mode.
Hopefully someone who has actually played with trans tables and values will chime in, I can only guess.
Its all in your tune. Even if manually selected and if the PCM meets either the throttle input, rpm, or speed, it will still shift up or down.
Try putting it into 2nd. It SHOULD start in second and STAY in second gear until you reach those parameters. If you mash the gas while in 2nd, it will downshift. If you go past the rpm or speed limits, it will shift to 3rd, but then will shift back down to second once it is back within the parameters within your tune.
Not necessarily, I can smack the rev limiter in all three low gears, it just sits in that gear and bounces off.
The kit puts a physical plug in the passage of the manual valve that is supposed to give it propriety over the solenoids.
It just seems that every now and again the computer manages to still override it. It is in the tune though, many aftermarket controllers can actually cause a bind up in 1st on the 80e with these kits.
The computer commands one gear, the manual valve commands another and you get a trans break, or a broken trans.
I wonder, are there different shift tables for the different column shifter positions?
I think there must be because when the shifter is placed in 2nd the trans starts in 2nd gear.
If this is so, then perhaps setting the upshift points to the next gears for say 1st, so high that even without the kit it would remain in that gear.
The same for 2nd position, still able downshift to 1st but unable to upshift to third until, say 100 rpms above the rev limiter.
That way, the computer would work with the gearcommand, be on board with it.
That is all very hypothetical of course, dependent on their actually being a shift table for each column position.
It is a fun feature though, you get to play with the gears like its a manual and then put it in drive and have all automatic upshifts.
Shifts nice and firm but rushes through gears and converter locks at forty. A tune should straighten that out.Quote:
Originally Posted by Tank
Alright. What i needed to know.Quote:
Originally Posted by Bowtie boy
And +1 about it being in the tune....
Yup, Yup. IN THE TUNE. Anyway, it sounds like your tune is set towards mpg efficiency. I personally like it (mine locks up at 34mph--thank you 4.10 gears!!!!!). But yes, you can change ALL of it in the tune.
yea lol I have 3.42s.
Ouch that tall I can see how holding gears may be a powerful ally for you.Quote:
Originally Posted by Bowtie boy
I was doing some poking around in the EFILive demo, just to see what tables are actually there.
There's a function under corrections labeled
[Manual hold gear 2nd, 1->2 shift speed]
and another labeled
[Manual hold gear 2nd, 2->3 shift speed]
As well as a
[Manual downshift gear, 3->2 shift speed]
Now I'm no tuning expert, not really even a novice I just understand some of the concepts.
But I would be willing to wager if you were to, perhaps change those parameters beyond the parameters you could conceivably generate in a given driving scenario, then perhaps the PCM wouldn't try to override the gearcommand.
What do you guys think?
I really dont know much about tuning but it sounds like that is what needs to be adjusted. Thxs for the input.
4L60E Manual Mode Downshifting 3-2 & 2-1 - EFILive Forum
I think that about solves it.
There seem to be singular speed values that the PCM will not allow the column actuated, manual downshift to occur at.
namely
2-1 Manual 44 MPH {D0928}
2-1 WOT 42 MPH
3-2 Manual 0 MPH {D0933}
3-2 WOT 90 MPH
You said you were at about 40? Lets say that as you punched it, it achieved a little over 40 as it was trying to shift.
It invalidated the parameters, but the gearcommand made it shift anyways. What one might think of as an uncertain shift, not sure whether to follow the manual valves command, or the solenoid.
I was wrong RPM has no barring on it, its based on speed alone.
I'd really like to see the effect of modifying those values to give a gear command like effect, in addition to a gearcommand equipped transmission.
This is still all very hypothetical of course.
Edit:Wait a moment I've got that mixed up. Let me look at this again.
Okay the 40 was addressing the 2-1 shift. So I don't know, it's still worth a try.
The number appears to indicate the speed below which it can shift, which makes little enough sense for the second parameters.
Perhaps the downshift is a mechanical function even without gear command, the solenoid isn't necessary. But that doesn't explain how it waits until the truck is under 62 mph in stock trim...
Or maybe its that it won't immediately hit second at part throttle, and that you must apply WOT to force it to downshift for one reason or another.
I think that might be it, if you put it into 2nd and floor it, it should drop into 2nd.
If you put the selector in 2nd it might wait until you floor it to engage.
So lets say you put it in 2nd, the gearcommand makes it go into second, then it bounces back because the PCM tells (which is shouldn't be able to do but these SK's were made for older transmissions so who knows) it too then it plunges into 2nd when you floor it.
Thats alot of help. I will definently keep that in mind.
D0919 "Manual Hold Gear, 2nd, 2->3 Shift Speeds
D0913 "Manual Hold Gear, 1st, 1->2 Shift Speeds
It would appear those are the designations of the hold speeds, and (D0928, D0933) are the downshift speed entrees. I would venture a guess that this is not just for EFILive, but part of the tuning itself addresses from the code inside the PCM.
I may be wrong though.
Seems HP doesn't have these tables, if my other research is correct.
If you get these entries modified in your tune, post up.
If I get my tune before then I'll post up the results as well.