vF Tuning for Manual Transmission 3rd Gens

here is a peak at what i did. like i said, the throttle at idle sucks at this point. it also has that bucking feeling back because of the jump between the -10.75 and -6.3 values. and a thud when getting back on throttle.

Im gonna get those low end values closer and higher and find the balance.

the point in making them all the same, i want the throttle to open and close based on my foot, not RPM, not vehicle speed, just my foot.

Ill let the MAF and 02 sensors work their magic with Matt's fuel and timing tables to take care of the important part (not blowing up)

I also increased the High load ACIS changeover closer to stock, cant even feel it anymore.



I do not recommend using these at this time, the lower table maybe. The upper table will need tweaking in the 0 , 9.5, 11, 14 zones.

 

On the Accelerator map, I bet if you plug that into Excel and get the bottom end to coming in a curved shape or looking more like the Throttle Angle map, you might be set?

 

This is what i was going to load this morning. with that said, i couldn't. I changed the 9.5 to 5 and left 11 alone.

The last time i put full 0s in here i had a crazy sensitive throttle and lost engine braking. But i changed the first gear map so much it might be doable here.

If this doesn't get the effect i want, will model it similar to my last one, at the lower range i will have an uptick for tip in and gradually smooth it back down to the -10 range. I just really dont want that as then i have lost the main goal, the same amount of throttle opening for every condition.

my inital thought, this will be overly sensitive. I will probably have to back it down

 

That is very interesting that this map would be more sensitive than the one above. I like the looks of this second one. LoL!

 

the one above starts at -10.75 with a sharp uptick, but doesnt hit 0 until around 11 on the throttle.

the new map starts at 0, with a soft rise untill 11

So while the first one looks more sensitive, its actually quite dull....trust me i know, i had to drive it all day.

the difference between 0 and -10.75 is massive (depending on the values in the other primary table)

 

Doh! Sorry about that. #readingishard

I would agree that an 11 point difference is quite large at the bottom. I found that with my V1 ALC maps.


Regardless, I like your shape. Map shape that is. The make much more sense than Stock.

 

04b41 - Matts file



One previous file



My last iteration (not the one i have now, i havent logged it yet)



I tried to pick places from my logs that were similar situations, just cruising with a light throttle input.

You can see Matts isnt bad, has some spikes and dips, to be fair i didnt log his much and didnt have any good log points to choose from. however the point is in the picture

My previous file (that i titled the CSV "CrazyThrottle") is just that, freaking crazy

The last file i posted about here (and sent to @MOC221_ ) smooth.

Ill log my current one tomorrow (since i dont have anything better to do) and see how it turns out.

EDIT: Shit, i picked the wrong PID for the last picture, ill fix it

EDIT 2: I dont have the correct PID for that drive, oh well, will update with a log from my current one

EDIT 3: Now i have one.

 

I've got about 100km on the file you sent me to try, and I must say the power delivery is damned good except for a couple of lurchy spots.
I did notice a difference in idle to 1000 torque, I almost stalled it taking off once today. I don't know which map to really look at first for that, but I know my previous airload maps had enhancement (+10%) from 600-1000 before smoothing.
Thanks again, your map really does drive well

 

im gonna guess it lurches at a light acceleration in the 1800-2200 rpm range?

thats where i felt it

and its tough to get 1st gear gravy without making 2nd dull

and getting 2nd good makes first crazy.

oh and the low RPM 1st gear maps are stock up to a point

 

since i ended up doing the full table ctrl-I first and never had a loss of any kind, i wonder what will happen if i change those limits 4k-5k across the board like you did now. i will try it later unless more info gets me considering other moves. but for the first time i can actually say it feels like it's cable actuated.

 

i noticed zero difference in the change from 4k to 5k.

however, i noticed in the other thread that someone found if you multiply the torque the truck makes by the differential and something else it comes out to around 4900 Nm. I chose 5k for a guess, but there are others making the same change and not getting full throttle until doing the Airload table. So im not sure if its necessary or not.

i do know that it says "limit" if you go high enough, you will be unlimited

 

@MOC221_

Increase this area for the tip in at take off, just be careful, small changes make large differences.

You can also increase the entine 0 and 9.5 range, but the more of a difference you get, the more likely you get that stutter on/off switch at low rpm low throttle.

I found that the 700 row doesnt matter too much, but increasing the 11 and 14 column there to a higher value will give a better kick right off throttle, it will then be ignored since you arent at 700 rpm anymore

Then increasing the 1300 in the 9.5 and 11 column will keep it moving a bit, too big of a difference i noticed creates a bit of a fall on its face effect.

I dont know how much you apply throttle, but i find myself tipping the throttle at take off very low, but accelerating in the 30 ish range.

 

I think having full zeroes or not also matters WRT Reg vs Prem maps. I did full zeroes (narrowed the observable range) on my SFOB Reg map and think it's a good middle ground between Reg and the Prem FO map.

Also smoothed the first 4 columns per @tonered post where he's done the same

 

I haven't had a chance to look closely at the Primary throttle map from @92ehatch 's file yet, but I do know that full zeroes in the far left column (full lift) fucks with engine braking considerably.

 

Don't know if I've experienced that yet... Lol I'll have to pay closer attention

 

Yep, right around 2200.

I also noticed that engine braking was less than I was used to, and I suspect that is because of the values at or near the far left column of the Primary throttle map.

Not dissing your work, I just prefer to have max engine braking if possible.

Putting the left side of that table back to near stock values will probably not play well with the altered 1st gear torque map though lol!!

 

Yeah the truck drove very smoothly with the left hand column "less negative", but almost no engine braking lol.

As soon as I put the values back to stock, engine braking came back.

It also has the effect of making the truck more jerky when transitioning off/on light throttle though..

 

I have a big change to try this morning. One of them is @92ehatch 's PTT map. Linear with two smoothings. One subtle kink in the middle. The starting value is -5.

 

I had the unfortunate near panic yesterday, before logic and reason set in, when I'd flashed a new map and then I started hearing a...not quite a squeal, but like the precursor to the squeal when a belt is starting to go bad lol whir/whine most noticeable at idle and at mid to high rpm. Only 30k on the truck. Smh.

 

Oh yeah! I really thought that I would be flashing back this morning, but the drive in was friggin' stellar. I did forget to test the new CC target. I did try CC at highway speed downhill and tried modulating the throttle in 1st at 2k. More perfect than anything previous this early in the settling.

This is the general description - 04B14 2.0 Prem SuperFOB OL - tb 07.vft map edits:

-- Engine - Cruise Control Active Minimum Speed - 16kph / 10mph
-- Engine - Vehicle Maximum Speed Global - 312kph / 200mph
-- Air Load Control - Control and Expected Air Flow (all four maps) - V3 (smoothed OVT 04B04 Example)
-- Idle Control - Cold Start Target Idle - 900rpm (both maps)
-- Accelerator - Acceleration Throttle Request to Airload - CTRL + I for full map
-- Torque Model - Torque Calculation Base During Full Throttle - 5000
-- Throttle Management - First Gear - 100% (all four maps)
-- Acceleration - Primary Throttle Torque Target - V2​

Thanks, @92ehatch ! Your PTTT map gave me to courage to put that Stock map in the trash. This is my PTTT map: