I have been working on this map for my car since the v3 first came out. I’m pretty happy with it and I have been doing track days and dailying my car for around 10t km this summer alone.
Car works well because I am used to driving it, but compaired to car with stock ecu the difference is really huge. My biggest problem is that when driving around 2000-3500rpm and making sudden moves with the throttle pedal up or down, car will always bump pretty hard you can really hear the engine and transmission to move and bang. Car has all new engine and trans supports so its not mechanical issue.
With rpm closer to 4000 the problem is not very bad, but the lower rpm is what I dont like.
I have been playing with many settings to get rid of this problem but I never found solution to remove it completely. I just saw that there is settings to scale the opening and closing speed of the dbw, and thats what I am trying next.
I have been playing with acceleration enrichments also, and tried tps based and map based but didin’t really see big difference. But disabling the acceleration enrichment will make things worse. Turning fuelling strategy to alpha n with map mult. and map based ignition also seems to help.
I will post my map file here and I can add some log file tomorrow.
Would be nice to get some ideas what could I do to make the car feel smoother like one with oem and it would not take so much learning and skill to drive the car without banging the powertrain.
And I am also curious has anyone else been able to make their car feel like normal car with v3?
My fuel table is done with the autotune. I went to dyno at one point but didin’t really get any better there.
Hi
if a different fueling strat helps, that mostly means that defenitly ur fueling is not ideal.
So ACC enrichment tuning can get an improvement and also finetuning ur VE MAP (dont switch to alpha N).
Looking at ur VE MAP…it is really really not good…u should finetune it manually first. Then i would switch to MAP based ACC enrichment…i could achiev better results with this and i think this is a more reliable strategy.
I would also set more async acc enrichment.
That should minimize missfire at load changes and therefore sudden torque jumps.
Next u need to decrease torque gradient.
U can limit throttle speed to around 250%/s. In addition u should go way less ignition in overrun…..around -10…that will reducie torque gardient after fuelcut.
That is all u can do with EMU. U cant reach the smoothness of OEM ECU cause more complex strategies are needed to control torque gradients.
But what u are looking for is fine tuning….noone will be able to solve this for u via a look at a log.
I did some more testing. Degreasing the speed of the throttle body just starts to feel delayed after slowing it down more from 250%s. Also addring more fuel for async enrichement does something, but even if I add 500 to the table the problem still exist.
What do you think I should do to my VE table? I tried to put it more rich and linear aswell as my dbw table. Overrun doesnt really affect the bumbing if I turn it on or off.
Also Im curious what does your car do if you are cruising in highway around 2500-3000 rpm, and tap throlle pedal a bit fast?
I also tried to change the acceleration enrichement for map based. but I had some issues with it, when I do a pull the lambda is all over the place. that can be seen in the log when tps is 100 lambda goes up and down. that doesnt happen with tps conrolled enrichement. For some reason the map rate is very bumby,
Select all the VE table and scale it up by 20% (enter into cell 1,2*) and then check if the card drives better. It looks like your ve table on low load is too low. When you keep the constant throttle and the lambda stabilize it is over 1.0 what causes poor driveability.
Your VE table looks noisy. Should be smooth like this:
According ur logs the MAP based enrichment looks much better in the situation u described to be not good.
But u need to filter the MAP sensor in the sensor settings…then ur full throttle perma acc enrichment will hopefully be gone and then u need to play with minimum MAP rate. I also had this fullthrottle problems…i set minimum MAP rate to around 180kpa/s.
My vehicle is behaving well in ur bad situation…the rootcasue of ur problem is that it leans out in this situation. But u should defenitly fix ur VE first befor doing more finetuning.
Thanks for the tips!, I did equalize my VE table to make it look like that above and scale it up 10%. Car is now running little rich, but I need to do some more dialling later. Or do you think lambda should be under 1 when cruising or should I aim for stable 1.
I think I also got the acceleration enrichement working better with your suggestions. the lambda spike is now more for the rich than lean, but I didn’t have much time to more tweaking because I had to put the car to the garage for the year, because I’m not using it on winter and driveshaf CV- joint got busted.
