My 07 LBZ has a 3500 RPM limit on it. Anyone know where to play with the tunes to remove this or raise it.
Thanks,
Rob
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My 07 LBZ has a 3500 RPM limit on it. Anyone know where to play with the tunes to remove this or raise it.
Thanks,
Rob
B1122 is more than likely the problem, it will limit the fuel amounts to 30mm3 at and above 3500RPM, though, because of the table interpolation the limiting will probably start to kick in at around 3300 - 3400RPM.
If you raise the values in that table at the higher RPM the value will be carried through to higher RPM's (the table ends at 3500). You also need to look at B1117, B1118 & B1119.
Cheers,
Ross
I figured those tables would be the ticket. I'll try adjusting those today and testing.
I was also looking at the "pedal pos. to desired torque" table. Torque starts falling off at 3250rpm's and goes to 0 at 3550rpm
Ross, what is the difference between B1118 and B1119?
Thanks,
Rob
OK, a little update.
I modded the B1118 and B1119 and still hit the 3500rpm limiter. I then modded those as well as "pedal pos. to desired torque" table and still have the RPM limiter.
I logged the runs, but haven't had time to look at them.
I'm not sure where to go from here.
EDIT: Dooouuuh, I forgot to mod the B1122 also. I'll do that and see.
Thanks,
Rob
Well even with the B1122, B1118, B1119 modded I still have the 3500rpm limit.
Any thoughts?
Thanks
Some logs would help if possible Rob, I'd like to see what the Main mm3 is dropping to if possible.
Cheers,
Ross
Ross,
I sent a couple logs. Hope it went to the right place (support@efilive)
Looks like the main flow rate drops a bunch and the turbo vane position goes to 0 for a bit. Any way to mod the flow rate and duration like the old platform?
Thanks a bunch,
Rob
Thanks Rob, I got the logs.
I forgot to ask, did you change the upper RPM cols in B1115 & B1116? I only ask because on a stock LBZ the desired torque figures plumet between 3250 and 3500 RPM (which will drop the main mm3 numbers), just like your commanded fuel drops from around 80mm3 down to 28mm3 over a similar RPM span.
Cheers,
Ross
I did change B1115 and B1116 Ross. Thats what is bugging me. I can't seem to control it with any of the available tables.Quote:
Originally Posted by GMPX
Thanks for your help.
Well, that's what you get for trying to rev it like a gasser ;) .Quote:
Originally Posted by IdahoRob
Did you notice if the logged torque value also dropped?
I'll keep looking I guess.
Cheers,
Ross
Sled pullers will need this removed. Hopefully I won't have to worry about going over 3500rpm. Truck does start pulling power before this it seems.:bash:Quote:
Originally Posted by GMPX
Torque value drops to 340's, rail pressure drops to 19k, flow rate drops, pulse time drops, turbo vane position goes to 0, etc.....
I have no doubt it is a limiter based on reducing desired torque, which then has the flow on effect to all the other things you noted.
Cheers,
Ross
It might be a TCM issue, if anyone has a manual transmission they can test the limit on that would be great.
Cheers,
Ross
I'm not sure if it matters Ross, but in neutral or park it still limits it. I guess the tcm could still be in control. This is starting to hurt the performance on the truck as I amp up tunes.Quote:
Originally Posted by GMPX
Rob, when you say this is hurting performance, is that because you are defueling at the top of a gear before it shifts. My truck has been doing this and I thought it was because of the stock transmission (which it may still be part of the problem) and I was hoping the co-pilot would help, but I got it all installed the other day and it didn't fix the problem. I get to the top of second gear and hit 3500 RPM and it defuels hard. That's where it does it worse, but it does it in all the gears to a smaller degree.
Exactly Josh, at first I also thought a transmiision slip causing defuel. I don't believe this is the case. On shift under 3350rpm, the things shifts and tears the tires up. Watch a log when RPM gets over 3400 and the thing just falls on it's face. If the tranny isn't defueling at 3350, it sure shouldn't at 3400+.Quote:
Originally Posted by JoshH
Did you try turning off torque limiting?
Engine Operation > Torque reference > parameters >B1124 enable/disable
and also verify B1115 last two columns adjusted
Yes torque limiting disabled and B1115 adjusted, still no go. Don't think it's possible with current software. But keep up the suggestions.:rockon:Quote:
Originally Posted by mrrattle
Looks like the PPE tuner on an allison LBZ has it removed, :bawl:
Are you trying to inspire me or annoy me with that comment? ;)
Also, I cannot find the tun file you sent me with all the things you have been trying, can you please send it to me again? ross at efilive dot com.
Thanks,
Ross
Inspire, inspire, and only inspire:D I'll send the tune file. I only sent the logs showing when the problem was happening.Quote:
Originally Posted by GMPX
Thanks Ross,
Rob
Shows how bad my memory is, I thought you had sent me a .tun file!
Anyway, see how it goes with the one I sent back, I'm sure others following this thread will be interested.
Cheers,
Ross
I'll load it up tomorrow and let you guys know. Thanks Ross.:notacrook:Quote:
Originally Posted by GMPX
Yes they will!Quote:
Originally Posted by GMPX
After looking at the changes Ross made, I had my doubts anything would be different. Well, I'm wrong again:bash:
Not sure why it worked, but the truck now revs at least up to 4000rpm's. The truck still pulls power over 3500, but not nearly as bad as hitting that 3500 wall.
I'll continue to try modding the tune to see if I can overcome the defuel, but thanks to Ross we're headed in the right direction.:rockon:
Thanks Ross, I guess I need to take my foot out of my mouth now.:D You guys have a great product and support.
Okay, so what changes were made? I need to get this figured out before next weekend.
Nothing super secret, it's all in there already.
Just make sure tables B1115 & B1116 have 'normal' values from 3500+ as well. Easiest way to do that is copy the column at 3000RPM and paste it in to every column up to 4000RPM.
Next, fill B1117 with 200mm3 all the way.
Then fill B1118 & B1119 with big numbers all the way to the end too.
Lastly, do the same as B1115/B1116 to B1122 (copy the column from say 2400RPM into all columns up to 3500).
That should do the trick.
Cheers,
Ross
Thanks Ross. I just modded my tune so I'll get it loaded this afternoon and let you know how it works.
What had me fooled was I went past 3500rpm with them all to no avail., just not all the way out to 4k. All except B1116 which shouldn't seem to matter. I think I might change back the four changes one at a time and see which one is the culprit.:D
I think it's 1115 because I had all of them adjusted already, but I only carried 1115 and 1116 out to 3500 and at 4000 it dropped off. 1116 should only apply when in low range so I'm guessing 1115 is what was causing my problems.
I don't think so Josh. I already had B1115 maxed out to 4k.:nixweiss: and Ross didn't change that one one my tune. I'd guess it was b1119, looks like I only had that out to the 3550rpm, I'm a dummy. Although if you had B1119 maxed out, maybe it is B1116 for some strange reason.
Well, I don't know what it is. I just loaded the adjusted tune in my truck and it did nothing for the RPM limit. It still hits a wall at 3500. What am I missing? I did everything you said to do Ross.
I still hit the wall too. It will go past but defuels hard when it goes over 3500. I can get it to 3800 or so, but it has no power
Now my B1122 table I have set to 200, this wouldnt throw it off would it?
Josh send me your tune and I'll look at it. You to snake, if you want. [email protected] not that I know anything, but mine is working, but still defuels.Quote:
Originally Posted by JoshH
sent
I don't know snake, the tables that Ross modded on my tune you've already modded on yours(maxed out the same). Our tunes have a different O.S. so I opened in two windows to compare. I don't see why yours doesn't run like mine, maybe it does.
I was just trying to get past 3500, now I can, but still pulls power pretty hard. We might be in the same boat....or truck.:nixweiss:
yea, sounds like it. I can get it to go past holding it in gear, just nothing there for power. I let off around 3800. Gotta be something in the TCM.
Maybe we can get that stick LBZ at the place to see how his runs above 3500. That would at least rule out the TCM.Quote:
Originally Posted by Cobra#3747
Here is another idea I have been kicking around, just havnt gotten around to it, but if we unplug the TCM it will default to 3rd gear (if I remember right) As long as it dosnt put the PCM in some limp mode that we cant control.
Just was thinking about it, I remember running LB7 with the TCM unplugged, it didnt limp the engine