I didnt want to mix up the threads by posting unrelated information so I figured I would start a new one.  This thread is for figuring out what works and what you find your truck likes.  

 

I did some more datalogging as of late and found that a more aggressive timing curve later in the rpm band, say 2500 + rpm, seems to pull harder up top.  Previous I was running tunes that maxed timing at 26*.  I took 2 tunes copied them and ran them back to back on the same stretch of road, same conditions.   I was not using wiretap for this so I will leave those details out

 

First Tune 29* max

Quote

Race 29*
Number of Power Levels	6
RPM Limit	3700
Valet Mode
Maximum Valet Mode Power	35
Timing Parameters
Fuel Load Timing	1
Low PSI Timing Reduct	5
Timing Reduct Scaling	80
LightThrottle Timing Adv	1
Light Throttle Limit	35
Timing Equilzer
1500RPM	16
2000RPM	19
2500RPM	24
3000RPM	27
MAX	29
Boost Level Fueling - CAN Bus
0 PSI	88
1 PSI	90
2 PSI	92
3 PSI	94
4 PSI	98
5 PSI	102
6 PSI	106
7 PSI	110
8 PSI	114
9 PSI	118
10 PSI	122
11 PSI	126
12 PSI	130
13 PSI	134
14 PSI	138
15 PSI	142
16 PSI	146
18 PSI	150
20 PSI	150
22 PSI	150
24 PSI	150
26 PSI	150
28 PSI	150
30+ PSI	150

 

Second Tune 26* max

Quote

race 26*
Number of Power Levels	6
RPM Limit	3700
Valet Mode
Maximum Valet Mode Power	35
Timing Parameters
Fuel Load Timing	1
Low PSI Timing Reduct	5
Timing Reduct Scaling	80
LightThrottle Timing Adv	1
Light Throttle Limit	35
Timing Equilzer
1500RPM	16
2000RPM	19
2500RPM	22
3000RPM	25
MAX	26
Boost Level Fueling - CAN Bus
0 PSI	88
1 PSI	90
2 PSI	92
3 PSI	94
4 PSI	98
5 PSI	102
6 PSI	106
7 PSI	110
8 PSI	114
9 PSI	118
10 PSI	122
11 PSI	126
12 PSI	130
13 PSI	134
14 PSI	138
15 PSI	142
16 PSI	146
18 PSI	150
20 PSI	150
22 PSI	150
24 PSI	150
26 PSI	150
28 PSI	150
30+ PSI	150

 

 

The interesting thing is the tunes are the same except for the timing above 2500 rpm.  If you look on the graph rpms hit that 2500 rpm mark at about line 20-21, each line is ~.3 seconds so 3 lines = 1 second.    You can see where timing jumps and also where boost jumps. 

 

Now keep in mind the graphs are not exact so take them with a grain of salt, but everything appears to show that the tune with higher timing up top gives faster time to 50 mph, and a faster ramp up of boost.  The higher timing tune appeared to reach 50 mph nearly 1 second faster.

 

as always studs are a good idea, but I am fairly sure anyone can run this timing above 2500 rpm.    If people are not blowing their heads off left and right with other tuners then there is no reason why this type of timing curve will hurt with the Quadzilla. 

 

 

Food for thought, open to other thoughts.

49 minutes ago, Dieselfuture said:

I've used 1500 paper and my fingers on the line with good results, just pay attention and be patient. And make sure you give it time to stop leaking as some fuel is left behind the nut that screws in head and with heat from head fuel will come out pass threads, that's why if you don't have hard starts (I don't think my truck makes a full revolution before it fires up) leave it be for few days. Or something is cracked, like tip of the line. 

Its definitely a leak not residual fuel.... Running all the way off the back of the motor dripping off the bell housing

2 hours ago, jlbayes said:

I have a polishing method that works great. I fight my ppump 24v lines every time.

I have sanded starting at 800-2500 with my finger tips multiple times...

38 minutes ago, dirty830 said:

I'm been fighting a surge around 80% throttle. Very noticeable 1st-4th almost feels like the wire tap is coming on but I'm at setting 3. I'm trying to get a good data log of it happening. 

Mine does this too.. Sounds identical to what you described. I will data log it tonight... I can even watch it in the boost gauge

Heres some logs of it happening. 

It looks like you're completely losing your canbus fuel and everything else follows, unless I'm looking at it wrong

2 minutes ago, Dieselfuture said:

It looks like you're completely losing your canbus fuel and everything else follows, unless I'm looking at it wrong

i think what you are seeing is me coming off the throttle. the surge is usually around 75%-80% throttle you can see a spike in the engine load.

Do you have the raw data I can look at?

surge3.csv

surge test (1).csv

Does RPM matter?

1 hour ago, Me78569 said:

Does RPM matter?

Upon further testing it comes on at 3100rpm every time. 

What tune are you running again?

33 minutes ago, Me78569 said:

What tune are you running again?

 

test tune 2.json

So if I look at the datalogs I see that at 3000 rpm and %70 throttle you are sitting at a canbus message of ~800.  

 

This means your are in your light throttle timing area of the map.   

 

Try setting light throttle timing to 0*   or dropping light throttle limit to ~%15

Any White smoke out the tail pipe when this bucking happens?

Here is a "chug" from me.. It comes in between 2600-3100 rpm but I might just be running out of fuel... This is on level 3 on my "extreme"tune.. I actually turned on the cel at the end of this pull. The tach dropped and the light came on.. P0500 and p1693..strange honestly this chugging wasn't as bad as usually

chugcel.csv

i think i posted the wrong file. this data better captures the effect. look around the 3k rpm and engine load 

 

iQuad-2018-01-30-02.01.34-489654982 (1).csv

Spotted a "bug" kinda. Since your tune is %100 under oem duration when you hit 3100 hard fuel kicks in to keep canbus high as oem duration falls off.  

 

I wasn't expecting a tune like this to happen so I didn't consider it.  I will have a fix sometime tomorow.

6 minutes ago, Me78569 said:

Spotted a "bug" kinda. Since your tune is %100 under oem duration when you hit 3100 hard fuel kicks in to keep canbus high as oem duration falls off.  

 

I wasn't expecting a tune like this to happen so I didn't consider it.  I will have a fix sometime tomorow.

and boy does it hard fuel. surprised me the first few times. i did notice it held canbus higher into the rpms i guess thats the hard fuel?

 

yea once you pass 3100 rpm ecm fueling drops off the face of the earth.  The hard fuel routine looks at tps input vs rpm over 3100 then adds fuel like a coked up ape.  Works well when the tune is above %100 lol.  

 

 

I'm fairly certain my problem is just that my vp cannot keep up with the fuel demand.... 

what kind of fuel pressure do you have at wot?

21psi... I don't mean inlet fuel is running out I mean that the vp can't supply the fuel demanded.. Truck will even die when I let off after a hard pullc unless I stay on the throttle or in gear.. 

@Me78569 any luck with the fix?