I have been trying to get the bucking out of my truck. It is driving me crazy and i just found out how to do a datalog. It seems to be getting worse over time, and I'm at a loss for what to do. Can someone look at this datalog and tell me 1) what is going on and 2) how to try and remedy it. Thanks for any help.

iQuad-2018-03-18-07.06.211972471670.csv

Those are 2 different examples.     

 

 

Example 1

On 3/21/2018 at 9:13 PM, Me78569 said:

scaling sets a max amount based on the timing reduct

 

So 5* timing reduct and %50 scaling gives you 2.5* max timing pull.

So 5* timing reduct and %30 sclaing givees you 1.5* max timing pull. 

So 5* timing reduct and %70 sclaing givees you 3.5* max timing pull. 

 

Example 2

 

the graph is comparing 2.5* of timing reduct at %100 scaling to 5* reduct at %50 scaling.  See how they both end up at 2.5* pulled max, but the 5* with %50 scaling hits that 2.5* of pull faster?

Quote

 

The key is how fast timing hits that point. in this example we have 2.5* timing reduct %100 scaling vs 5* timing reduct %50 scaling.  same total pull in timing, but the 5* %50 scaling hits peak timing pull at %50 tps input

 

 

Edited March 23, 20187 yr by Me78569

I think I'm getting it. 

On 3/19/2018 at 5:19 PM, mossyoak71 said:

 

How do I get that many gauges?!

1 minute ago, notlimah said:

 

How do I get that many gauges?!

Swipe up on the screen. 

On a good note, I had DCS redo my tranny tune and he sent it this afternoon, so I will try it over the weekend. I think 50% of the issue with the bucking is the transmission. (Ford 5r110). Just alot of bugs to exterminate!!?

Yea I know you can swipe up for different gauges but I can only get 5. Must be screen size limited.

53 minutes ago, notlimah said:

Yea I know you can swipe up for different gauges but I can only get 5. Must be screen size limited.

 are you using right flash with right profile, I've used quite a few different android devices and all show same. 

54 minutes ago, notlimah said:

Yea I know you can swipe up for different gauges but I can only get 5. Must be screen size limited.

 

Swipe left or right it will pan to different gauge layouts. 

Just now, Mopar1973Man said:

 

Swipe left or right it will pan to different gauge layouts. 

Yes didn't even think of mentionin gthat lol, though everyone was aware of it. Apparently not 

Well I’ll be damned!

10 hours ago, notlimah said:

Well I’ll be damned!

Always nice to have little rewards like that. 

dude i plugged in those timing settings and wow it smoothed my low end chug right out. i had a bucking issue if i let it dip too low on my 6 speed so i would just drive it with more rpms to avoid this. but it was inevitable when taking off from a stop most times. with these timing setting i can lug it just like stock and you cant even tell the truck has stock turbo with 7x11 sac injectors on board.

So I was just over looking at the threads on 24v section, and noticed the one about AC noise interference with the ECM and VP. Since I have a conversion, I'm using the Ford alternator and charging system. I also deleted the heater grid on the Cummins. The reason I bring this up is I am still having the bucking issue. When I run it on level zero, it happens very slightly, mostly at 1500 - 1600 rpms, 25% load, and 55- 65 mph. Mind you the timing is stock. As soon as I take it to level 2 or 3, the bucking gets more prevalent, and I'm down to 14.5 in the timing. Now as soon as I hammer the throttle it seems to stop the bucking, or should I say it comes out of it. Now on levels 4 and 5, as soon as the wire tap starts to come on it really bucks, and puffs smoke. Not a steady stream of black. Then the turbos start to clear it up and it runs ok, not great. So my point is, this issue seems to have just started little by little, is there anyway I can check for the AC noise? Could I unhook the big wire from the alternator and see if that helps? In other words just run off the batteries. This gremlin is really kicking my arse, and also it is a reman vp44, I got from XDP. Any suggestions will be greatly appreciated, and thanks!

If by 'bucking' you mean the converter is locking and unlocking rapidly then yea, could be your ALT and removing it from the equation while driving will prove that or not. If the 'bucking' is more like surging, then I'd say you're still fighting tuning issues in those scenarios you described.

6 hours ago, notlimah said:

If by 'bucking' you mean the converter is locking and unlocking rapidly then yea, could be your ALT and removing it from the equation while driving will prove that or not. If the 'bucking' is more like surging, then I'd say you're still fighting tuning issues in those scenarios you described.

Yes it is a surging issue, my convertor doesn't lock till it's in od. Try to get the tunning on the engine figured out before I try locking it in other gears. 

@mossyoak71 yes you can unhook the lead from the alternator and drive on battery's to see if it helps. Next thing Id be making sure injectors are working properly. 

sounds fuel related to me. 

36 minutes ago, Me78569 said:

sounds fuel related to me. 

Why would it run ok in stock?

13 hours ago, mossyoak71 said:

So I was just over looking at the threads on 24v section, and noticed the one about AC noise interference with the ECM and VP. Since I have a conversion, I'm using the Ford alternator and charging system. I also deleted the heater grid on the Cummins. The reason I bring this up is I am still having the bucking issue. When I run it on level zero, it happens very slightly, mostly at 1500 - 1600 rpms, 25% load, and 55- 65 mph. Mind you the timing is stock. As soon as I take it to level 2 or 3, the bucking gets more prevalent, and I'm down to 14.5 in the timing. Now as soon as I hammer the throttle it seems to stop the bucking, or should I say it comes out of it. Now on levels 4 and 5, as soon as the wire tap starts to come on it really bucks, and puffs smoke. Not a steady stream of black. Then the turbos start to clear it up and it runs ok, not great. So my point is, this issue seems to have just started little by little, is there anyway I can check for the AC noise? Could I unhook the big wire from the alternator and see if that helps? In other words just run off the batteries. This gremlin is really kicking my arse, and also it is a reman vp44, I got from XDP. Any suggestions will be greatly appreciated, and thanks!

 

 

if the issue is there on stock level, even a little I start to think it is fueling related.  

So I guess my next step will be to put the DDP or stock ones back in and see if it clears up. If not then could the VP be going?. I have yet to get a obd2 port wired in, so I guess I need to do that also. Dang man it never ends. 

I would start with obd and try to see if any codes are there.    I dont remember your setup, but do you have the 02 ecm with auto flash or manual flash?