LBZ: Need Advice, New to Tuning

[macanic21]

Welcome!


I'm not your guy but hopefully you can get a hold of someone. I know there is more to the LMM than the LBZ but it can't be that bad. My biggest problem is I don't know what the safe limits are. If I knew that I would just play around until I got things where I wanted them.


This is for an LBZ but take a look anyway.
https://www.youtube.com/watch?v=HKu80j0bUHk

 

[macanic21]

I fought this on mine for a long time. Never ever did get it to where I was really happy with it but It was manageable.

Care to elaborate on what changes you had to make?

 

[2004LB7]

I'd say downshifting when appropriate would help tons

 

[macanic21]

Just FYI, took it for a run today after the cooling system service, new belt and idlers, taping the intake for water/meth, EGT probe/CTS2 install.

EGT's peaked at 1350*, probe in the passenger manifold right before the flange. I'm not sure what these run stock but I have about 10% pulse width in it.


Is there anyone around I could pay to look at this trans tune and see if they could fix it? The problem is, I would require them to only fix the problem and not password protect it.

 

[monster50iii]

Now I may be wrong, but there are tables with the LMM that make trying to change shift points a PITA. I messed with it for a while and found that after flashing the new tcm tune in, it behaved like a stock tcm. After a few days of driving it would suddenly do what I changed for a while (this was all T/H stuff..). There may be tables that are contradicting what you are trying to achieve. The top tuners find these missing tables that are being a hurdle, so they can remove that hurdle. Guys like you and I, dont have the knowledge/equipment to do that. The LBZ may not be this way TCM wise, but I'm willing to bet that may be a part of your issue. My advice, try making your tune's fuel curve more digressive.

 

[2004LB7]

I'll see if I can dig up my trans tune from before the tires and regear for you to try. That one ran pretty good. I think I had same size tires too

 

[macanic21]

Check these logs out guys. Between frame 3300 and 5400 you can see vane position and boost oscillation at certain mm3's. The only difference between the two tunes is that I added 15% timing in the cruise area of 0909. My thought is that when it smooths out in the middle it is dropping to different PID settings (you can see this if you watch 2252 and 2254). The issue possibly caused by the timing change creating different turbo response characteristics (I do tune PID's for a living so I'm not totally stupid on this stuff)?


Also, the stock programs barely get out to 100mm3's.


I re-started with the stock files and I'm going to try to make a more refined tuneup now that I have learned a little more. Instead of pasting timing 0909 into every table I'm going to try to take advantage of the various stock maps and adjustments the ECU is automatically making (obviously, not changing timing depending on # of injections isn't the best). I probably won't bother with the altitude differences though.

 

[2004LB7]

Check these logs out guys. Between frame 3300 and 5400 you can see vane position and boost oscillation at certain mm3's.

I must not be seeing what you are seeing. Looks like a little overshoot or lag/delay, but not much and certainly doesn't look like an oscillation to me. can you screenshot the area you are concerned about and upload it here?

 

[macanic21]

Starting around frame 4500 in this log. This one should be a little clearer.


I don't see anything in the tune that should cause this so I guess I should put the stock timing map back in and make sure it wasn't a fluke but I know that's all I changed. The closest thing I found was table 2227 where it flirts with the 34% adjustment at 1600 RPM. However, I don't think this table is in effect. The timing doesn't jump around, the mm3 doesn't jump, desired boost doesn't jump....

 

[2004LB7]

try not zooming out so much. if you are zoomed out a lot it will look like that. zoomed in a little more it looks more like it is just tracking with the requested boost and vane positions

is it noticeable while driving? can you feel it or is it only in the logs?

 

[macanic21]

I could feel it. It feels like a gust of head wind.

I fixed the problem today although unfortunately I can't tell you what caused it. I started from scratch, making small changes and logging every time. I'm finally back to where I was and then some. I spent about 5 hours this morning on it. I couldn't fix it with PID control changes. I even disabled PID control and still had boost fluctuations without vane position fluctuations, strange.... I think it was timing related but timing wasn't jumping, fuel wasn't jumping, no idea....


Anyway, its fixed. We'll see what I mess up next! I did some things differently as far as power tuning goes in this one. I didn't mess with desired torque tables in this one, just bumped the mm3's up so it got out to 120 at peak torque request after I removed the limiters. Bumped boost up to around 25psi, timing between 50% and 60%.


Here is the change log for those of you making your own. Tune and logs attached. The logs are not of the latest tune with the added fuel since I stopped logging once I knew I had the boost stability fixed so I could watch EGT with the Edge.



Modification summary: 09:59:43 am, Wednesday Jan 02, 2019
No effect in boost stability
Engine Operation.Fuel Pressure
{B1021} Max Number of Injection Pulses, modified.

Modification summary: 10:16:15 am, Wednesday Jan 02, 2019
Removing limiters, set fuel table to 125mm3 max
Engine Operation.Injection Amount.Torque Reference
{B1102} Torque Based Fuel, modified.
{B1111} Torque Based Fuel IAT Multiplier, modified.
{B1117} Maximum Fuel Quantity vs RPM, modified.
{B1121} Intake Temp Torque Limiting, modified.
{B1122} Torque Fuel Limit RPM Conversion, modified.

Engine Operation.Injection Amount.Main Injection
{B0793} Main Injection Rich Mixture Limit, changed from "0.920" to "0.000".
{B0794} Main Injection Lean Mixture Limit, changed from "1.400" to "4.000".

Engine Operation.Torque Limits
{B1187} Min Throttle for BTM Enable, changed from "35.0" to "100.0".
{B1188} Min Throttle for BTM Disable, changed from "30.0" to "90.0".
{B1191} Max Speed for BTM Enable, changed from "5" to "0".
{B1190} Max Torque BTM Enabled, changed from "443" to "2214".
{B1189} Max Torque BTM Disabled, changed from "959" to "2214".
{B1118} Maximum Torque 1 vs RPM, modified.
{B1119} Maximum Torque 2 vs RPM, modified.
{B1128} Barometric Pressure Torque Limit, modified.

Engine Operation.Glow Plugs
{B1601} Glow Plug Timer (Pre Start), modified.

Modification summary: 10:35:31 am, Wednesday Jan 02, 2019
Set timing to 50/50 except where stock was higher
Engine Operation.Injection Timing.Main Injection Base
{B0909} Timing Base, (B), modified.

Modification summary: 10:59:02 am, Wednesday Jan 02, 2019
Set timing to 60% in cruise area and blended
Engine Operation.Injection Timing.Main Injection Base
{B0909} Timing Base, (B), modified.

Modification summary: 11:15:08 am, Wednesday Jan 02, 2019 v10.8
+20% pulse width up top
Engine Operation.Injection Amount.Main Injection
{B0720} Main Injection Pulse, modified.

Modification summary: 11:45:25 am, Wednesday Jan 02, 2019 v10.9
+5% up top and smoothed overall
Engine Operation.Boost Control
{B2206} Desired Boost Levels, EGR Off, Low Altitude, modified.

 

[macanic21]

Alright guys. I'm on to the next thing to figure out. I'm having trouble controlling the cold vane position. Below 25mm3 or so it closes the vanes to like 75%. This is fine for warm up but it doesn't transition very smoothly when I get up into the target boost tables. It also doesn't stay there at idle.


I would like to be able to close the vanes down to 80% or 90% when the truck is cold idling to warm it up quicker. Then kick back to the normal vane position tables above idle or once the coolant temp gets above a certain point. I've been messing with the cold start position, delay and temp tables but I don't seem to get much change.

I attached where I'm currently at which is back to stock on the aforementioned tables.

 

[monster50iii]

Look at B2241 & B2240. If you look at B2231 you'll see the ecm will attempt to control boost by desired boost. SO, go to vane positioning ECT and use that to set what you want your vane positioning to be at idle when cold. You have vane position maximum cold set at 100, so you just simply need the ecm to call for what you want. Being B2231 wont allow the ecm to control boost by trying to meet desired boost, it will look for what you set the vane positioning to be at. Hope this helps.

 

[macanic21]

Something like this?

 

[macanic21]

I'm wondering about low RPM timing. Stock you can see the timing is 100% BTDC. I left my tune this way only changing places where it was below 50%. What is the best for power? What is the best for economy? Would it be better to go 50/50 everywhere?



I'm curious why they did this stock.

 

[2004LB7]

50/50 is a good safe method that works quite well for basically all of the map. for the low mm3 and cruising areas you can run 60/40 or maybe even 70/30 for better MPG. be careful of too much timing in RPM as it can be hard on the engine.

 

[macanic21]

You guys might get a kick out of this. My attempt at a manual mode transmission setup. As of yet untested.

Operating theory; Put trans in T/H with selector in manual mode.


Also, my latest as of yet untested but only slightly off my last ECU tune. 60-70% cruise timing and low boost.

 

[monster50iii]

you can use alot more timing in the cruising/mid-range. 7-8* @ 20mm3 isnt crazy at all. Dont worry so much about the percentages in these portions of the tune.

 

[THEFERMANATOR]

you can use alot more timing in the cruising/mid-range. 7-8* @ 20mm3 isnt crazy at all. Dont worry so much about the percentages in these portions of the tune.

I'm running that much on my lb7 with 45 over sacs. I've gone as high as 12-13 on the lower fueling cruise range on lbz/lmm.

 

[monster50iii]

Glad I'm not the only one!