Engine stall/Jerks at lower rpms when WOT.

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Topic: Engine stall/Jerks at lower rpms when WOT. (Read 25675 times)

giles92

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #15 on: July 10, 2016, 03:43:05 PM »

KFBAKL gives acceleration enrichment, more the KFBAKL more is the enrichment


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Jim_Coupe

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #16 on: July 14, 2016, 06:24:20 AM »

Been increasing KFBAKL in stages now.. without any success. When the car is just started and almost cold i have no issues what so ever... But after driving inpired for couple mins i get this "throttle cut" sort of problem at lower rpms around 1500 - 2300.. It just looses all power and bang comes back.. it dipps.. Very frustrating since i cant enjoy the low end torue feeling in my 3.2 liter.

Some say check TVUB: heres my actual figures.. Im running Bosch EV14 1000cc on E85.

_16.00_ _38.00_ _59.00 _ _80.00__122.0_
2.5603 | 16.402 | 1.1895 | 0.8801 | 0.7708

It feels lika a temp related problem.. Because at cooler engine i dont have this at all?


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nyet

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #17 on: July 14, 2016, 09:38:04 AM »

Post a log for crying out loud

I have NO idea why anybody thinks fueling would cause throttle cut.


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vwaudiguy

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #18 on: July 14, 2016, 10:18:36 AM »

Quote from: nyet on July 14, 2016, 09:38:04 AM

I have NO idea why anybody thinks fueling would cause throttle cut.

When the engine locks up, there's permanent throttle cut.


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Jim_Coupe

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #19 on: July 14, 2016, 11:36:04 AM »

Heres a VCDS log with plate angle.. At the end of the log im trying to force the problem. I see alot of 100% angle but its around this area the problem occurs..


« Last Edit: July 14, 2016, 11:38:58 AM by Jim_Coupe »	Logged

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nyet

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #20 on: July 14, 2016, 11:48:04 AM »

Without seeing pedal angle, requested torque, and requested load, it is impossible to tell anything from logs Sad

You're going to have to find a real logging solution or you are pretty much dead in the water.


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Jim_Coupe

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #21 on: July 14, 2016, 12:07:51 PM »

I could look at requested torque+load and se if i can find something there..


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Carsinc

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #22 on: July 15, 2016, 09:02:36 AM »

What maf did you end up using on this?


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Jim_Coupe

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #23 on: July 18, 2016, 12:14:49 PM »

If you mean MAF size? 83mm S4 MAF with VR6 3.2 sensor.


« Last Edit: July 18, 2016, 02:32:11 PM by Jim_Coupe »	Logged

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q_dubz

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #24 on: August 11, 2016, 05:48:48 PM »

Anything folks?


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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #25 on: August 11, 2016, 11:40:15 PM »

Quote from: Jim_Coupe on July 18, 2016, 12:14:49 PM

If you mean MAF size? 83mm S4 MAF with VR6 3.2 sensor.

Use a MAF setup where you can grab values from another bin instead of a mix. When you've sorted stuff like this you can switch to larger/custom MAF and start running boost.


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Try ME7idatool http://nefariousmotorsports.com/forum/index.php?topic=21130.0

prj

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #26 on: August 12, 2016, 07:51:36 AM »

He is running a NA engine with a turbo and massively underscaled load.
His ECU's throttle control has no idea he is running boost either.

Those on this forum who know how to help you, will not help you with this.


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Carsinc

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #27 on: August 12, 2016, 08:29:18 AM »

PRJ is correct, If I knew how to fix this I would help you. Since we are here to learn, PRJ
if he were to change to a HPX PMAS and run it in blow though would that not help with this problem?
Again I am just asking and I know the correct answer is a custom patch of code, but i dont understand
that side of things.


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nyet

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #28 on: August 12, 2016, 09:37:51 AM »

Quote from: Carsinc on August 12, 2016, 08:29:18 AM

if he were to change to a HPX PMAS and run it in blow though would that not help with this problem?

Of course not. How would that possibly change the ECU's failure understand >100 load?

Bottom line: adding FI to an NA ECU is a lot of work and CANNOT BE DONE by just twiddling a few maps.

It is utter folly.

I have no fucking clue how many times we have to say the same thing. It is one thing to be able to quickly learn to DIY a few simple map changes. It is a whole other thing to learn how to write custom code for an ECU you barely understand.

If you dont even know what LOAD is, how can you possibly expect to be able to patch the ENTIRE load path of the ECU, in assembly, without source code?

Quote from: prj on August 12, 2016, 07:51:36 AM

Those on this forum who know how to help you, will not help you with this.

It is not even this; it is a purely practical matter: training somebody to do this is a shitload of work and would likely take weeks if not months of handholding and explanations, and unless the student is already familiar with assembly and embedded systems in general, not even that is possible.

To complicate matters even further, a proper logging system would still need to be created, from scratch, that can log arbitrary RAM locations.


« Last Edit: August 12, 2016, 09:42:43 AM by nyet »	Logged

q_dubz

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	Re: Engine stall/Jerks at lower rpms when WOT. « Reply #29 on: August 12, 2016, 09:59:46 AM »

My problem existed when I was NA as well. More specifically when I installed the 630cc and dialed them in.


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