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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Wed Nov 01, 2017 8:41 pm 
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Location: Oregon, USA (English)
Thats pretty nifty, thanks Enabled for the link...I have my “clutch to start” switch coded off since im always starting the car from outside of the vehicle instead of getting in to push the clutch.

I however will be trying to figure out how to access that map so I dont have to physically do anything with the clutch switch. Im hoping as soon as I get my laptop in my lap again later tonight, that the map is atleast in the TunerPro software XDF.

I’d like to be able to add things to the rr def but I have no idea how to aside from just correcting misspellings / or adding descriptions to things that are already in the xml.


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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Wed Nov 01, 2017 10:34 pm 
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Location: Houston, TX
I would think that "kf_pwg_fak_kup_swi__ndif__pwgist" map has the most effect on the clutch switch dependent revhang (which was traditionally modified by people cutting the clutch switch wire).

Looks like a multiplier factor for throttle body when clutch switch is activated. It seems to modify the throttle body delay, instead of dealing with ignition angle.

There are a couple of single byte timers for it as well.


Last edited by Enabled on Wed Nov 01, 2017 10:41 pm, edited 1 time in total.

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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Wed Nov 01, 2017 10:38 pm 
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Location: Houston, TX
Write FF from 0x5BAE to 0x5BB9 (C6 version)
or FF at 0x5A67 to 0x5A72 (AD version)

for a quick experiment.


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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Wed Nov 01, 2017 10:42 pm 
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Enabled wrote:
Looks like a multiplier factor for throttle body when clutch switch is activated. It seems to modify the throttle body delay as well, instead of dealing with just ignition angle.


Just off the top of my head I would assume that it slows the throttle valve to prevent it from slamming shut.

These cars are crazy with all this computer controlled stuff lol. Compared to the carbureted v8 vehicles I started with...and I thought the mk3 VW Golf big turbo build I did was so far advanced back in ‘97.


Last edited by 323toslow on Wed Nov 01, 2017 10:45 pm, edited 1 time in total.

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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Wed Nov 01, 2017 10:44 pm 
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Enabled wrote:
Write FF from 0x5BAE to 0x5BB9 (C6 version)
or FF at 0x5A67 to 0x5A72 (AD version)

for a quick experiment.


I’ll give that a shot later on...won’t be able to drive it until tomorrow morning though.


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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Wed Nov 01, 2017 10:46 pm 
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Location: Houston, TX
323toslow wrote:
Enabled wrote:
Looks like a multiplier factor for throttle body when clutch switch is activated. It seems to modify the throttle body delay as well, instead of dealing with just ignition angle.


Just off the top of my head I would assume that it slows the throttle valve to prevent it from slamming shut.

These cars are crazy with all this computer controlled stuff lol. Compared to the carbureted v8 vehicles started with...and I thought the mk3 VW Golf big turbo build I did was so far advanced back in ‘97.


Yes, correct. It slows down the movement so it can be more 'luxurious'.


and there's even a 5.0 second timer for it, I suppose since actuating clutch switch.


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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Wed Nov 01, 2017 11:08 pm 
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Enabled, do you have an ms42 vehicle?


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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Wed Nov 01, 2017 11:56 pm 
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Location: Houston, TX
Yes I do.


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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Thu Nov 02, 2017 12:23 am 
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Location: Oregon, USA (English)
Enabled wrote:
Write FF from 0x5BAE to 0x5BB9 (C6 version)
or FF at 0x5A67 to 0x5A72 (AD version)

for a quick experiment.


I did this and started the car then checked inpa...was running rough and the rough value for cylinder for was way high, the other 5 were 0.000.
Reverted back to previous tune and its back to normal.

I asked about ms42 cuz i was wondering if you are able to view the LVT for your car in RR logger.


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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Thu Nov 02, 2017 12:40 am 
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Location: Houston, TX
Weird. Unexpected.
What version do you have, and where did you FF?

I used testo software for logging when I was messing with mine intensively. But it's auto, so I can't confirm much in this area.


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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Thu Nov 02, 2017 1:12 am 
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Enabled wrote:
Weird. Unexpected.
What version do you have, and where did you FF?

I used testo software for logging when I was messing with mine intensively. But it's auto, so I can't confirm much in this area.


Its been a long time since messing with hex editors until recently...by FF you mean actually typing in FF right? I have AD, started with 0x5A67 and stopped with 5A72.

I was asking about rrlogger learned table values because I am itching to see my timing learned values so I can start tweaking those, but it just errors out when I try to open lvt. Was wondering if maybe you were able to get it working.


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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Thu Nov 02, 2017 2:25 am 
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Location: Oulu, Finland (English/Finnish)
In learning tables only fuel adaptations and knock global works. The knock tables don't because no one seems to know the right RAM address for those. And even in fuel adaptations there is something strange going on and those don't always work.

323toslow wrote:

I’d like to be able to add things to the rr def but I have no idea how to aside from just correcting misspellings / or adding descriptions to things that are already in the xml.


I can easily add the maps needed for definition. Only thing I'm missing are human readable translations and descriptions for the maps.


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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Thu Nov 02, 2017 2:47 am 
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pazi88 wrote:
In learning tables only fuel adaptations and knock global works. The knock tables don't because no one seems to know the right RAM address for those. And even in fuel adaptations there is something strange going on and those don't always work.


Yeah thats a bummer too. What would you suggest as a good way to tweak ignition timing...? Use an amplified microphone attached to the stock knock sensor bolts and log with your ears? Or log the knock sensor voltages?


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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Thu Nov 02, 2017 4:06 am 
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Location: Oulu, Finland (English/Finnish)
323toslow wrote:
pazi88 wrote:
In learning tables only fuel adaptations and knock global works. The knock tables don't because no one seems to know the right RAM address for those. And even in fuel adaptations there is something strange going on and those don't always work.


Yeah thats a bummer too. What would you suggest as a good way to tweak ignition timing...? Use an amplified microphone attached to the stock knock sensor bolts and log with your ears? Or log the knock sensor voltages?


In boosted engines I have just left ignition table to too high advance and then after driving while, just check what advance it want's to run on each RPM and load. And then adapt the ignition tables according to that. But for fairly stock NA engine it's best to just run euro2 sw. Those are really well optimized and the engine will make way more power that the factory tells. For example couple of weeks ago we dynoed 100% stock euro2 m52b25tu in e39 and that made 188hp from crank. When it should make 168-170hp.


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 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Thu Nov 02, 2017 11:39 am 
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Location: Houston, TX
323toslow wrote:
Its been a long time since messing with hex editors until recently...by FF you mean actually typing in FF right? I have AD, started with 0x5A67 and stopped with 5A72.


That is correct. I wonder if adaptations would have to be cleared. You corrected checksums?
That was such an unusual effect. Curious to what is going on.

You didn't get to see what happens when you press the clutch and release?



On AD version, see what happens when you put 20 at 0x341. Max timer for rpm increase/decrease calculation.


Or put 00 at 0x33A (instead of the 05 0r 06 you have there). This is a timer for the throttle factor. (this one I am not sure how it works too much)

See which one does the most effect. Or maybe both combined


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