RomRaider Logo

RomRaider

Open Source ECU Tools
 FAQ •  Register •  Login 

RomRaider

Documentation

Community

Developers

It is currently Sat Feb 21, 2026 6:02 pm

All times are UTC





Post new topic Reply to topic  [ 78 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6  Next
Author Message
 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Thu Nov 02, 2017 5:09 pm 
Offline
Experienced
User avatar

Joined: Sat Oct 14, 2017 4:54 am
Posts: 296
Location: Oregon, USA (English)
Enabled wrote:
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


Im using the mss5x flashtool so checksum should be good. I pushed the clutch in at idle didnt notice anything different, I didnt drive the car though because it seemed like cyl4 was completely shut down.

Just to clarify, those previous FF value entries are for the partial bin correct?
I didn’t reset adaptions either, I should have...should probably get in the habit of doing that after each change I make as well.

I’ll check out your new suggestions later on today when I get time with the laptop, finding euro2 tune is on my to do list for later as well.


Top
 Profile  
 
 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Thu Nov 02, 2017 5:46 pm 
Offline
Experienced

Joined: Thu Sep 25, 2014 4:53 pm
Posts: 627
Location: Houston, TX
Yes, all in the AD partial bin.


Top
 Profile  
 
 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Fri Nov 03, 2017 12:53 am 
Offline
Experienced
User avatar

Joined: Sat Oct 14, 2017 4:54 am
Posts: 296
Location: Oregon, USA (English)
Enabled wrote:
Yes, all in the AD partial bin.


Ok, did the FF thing again and then cleared adaptions and this time car ran fine. To me it seemed like the rpm dropped faster but its nothing dramatic.

Then I reverted it back, and then put in the 20 at 0x341 and 00 at 0x33A both at the same time. Throttle seemed very touchy, to touchy haha. Getting ready to test just the 20 at 0x341 right now.

Update: Didn’t notice any difference with just the 20 at 0x341.


Top
 Profile  
 
 Post subject: Fast revs and fast rpm drops at vehicle cold temps
PostPosted: Thu Nov 09, 2017 7:05 am 
Offline
Experienced
User avatar

Joined: Sat Oct 14, 2017 4:54 am
Posts: 296
Location: Oregon, USA (English)
I noticed something the other morning when starting my car cold. Usually I don't touch the gas pedal at all until the car is warmed up considerably.

I barely touched the gas pedal and the vehicle revved extremely fast like insanely fast, and rpms dropped just as fast when I let off of the gas. Just super responsive, I was in shock. What exactly is causing that because I would like to mimic that when the vehicle is at operating temp.


Top
 Profile  
 
 Post subject: Re: Fast revs and fast rpm drops at vehicle cold temps
PostPosted: Thu Nov 09, 2017 4:42 pm 
Offline
Experienced

Joined: Thu Sep 25, 2014 4:53 pm
Posts: 627
Location: Houston, TX
323toslow wrote:
I noticed something the other morning when starting my car cold. Usually I don't touch the gas pedal at all until the car is warmed up considerably.

I barely touched the gas pedal and the vehicle revved extremely fast like insanely fast, and rpms dropped just as fast when I let off of the gas. Just super responsive, I was in shock. What exactly is causing that because I would like to mimic that when the vehicle is at operating temp.



I would start with kf_zwb_sa__n__tkw and kf_zwb_sa_kk__n__tkw (with A/C)

For the decel part at least.

That and cold thick oil.


Top
 Profile  
 
 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Thu Nov 09, 2017 6:51 pm 
Offline
Experienced
User avatar

Joined: Sat Oct 14, 2017 4:54 am
Posts: 296
Location: Oregon, USA (English)
Yep i’ve got the ignition retarded on the a/c off table, and that helped quite a bit, also made the changes you suggested with hex editor and that helped as well.

But man idk...when the car is cold it revs so fast its almost unbelievable. But it only lasts for about a minute. Theres quite a bit going on during the first minute or so after cold start so its gonna take some trial and error to figure out. Not being able to view the knock learned value table could hinder any type of effort trying to mimic how it responds during the first minute after cold start, since the timing and fueling is slightly different cold and warm. Im assuming the cold timing and fueling contributes to how fast/responsive it is at cold, as well as other parameters.


Top
 Profile  
 
 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Thu Nov 09, 2017 7:10 pm 
Offline
Experienced

Joined: Thu Sep 25, 2014 4:53 pm
Posts: 627
Location: Houston, TX
323toslow wrote:
Yep i’ve got the ignition retarded on the a/c off table, and that helped quite a bit, also made the changes you suggested with hex editor and that helped as well.

But man idk...when the car is cold it revs so fast its almost unbelievable. But it only lasts for about a minute. Theres quite a bit going on during the first minute or so after cold start so its gonna take some trial and error to figure out. Not being able to view the knock learned value table could hinder any type of effort trying to mimic how it responds during the first minute after cold start, since the timing and fueling is slightly different cold and warm. Im assuming the cold timing and fueling contributes to how fast/responsive it is at cold, as well as other parameters.


It wouldn't have to do with knock so much, but ignition advance and fueling will give you clues.

This is a euro 323i?
I just looked through some other maps and I didn't find enough differences, yet.
PM me the partial?


Top
 Profile  
 
 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Thu Nov 09, 2017 7:17 pm 
Offline
Experienced
User avatar

Joined: Sat Oct 14, 2017 4:54 am
Posts: 296
Location: Oregon, USA (English)
Its a US 323i m/t with the ron tables, and partial cold and warm of exh and int vanos tables from euro 523 m/t.

PM’ing in three.


Top
 Profile  
 
 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Thu Nov 09, 2017 7:28 pm 
Offline
Experienced
User avatar

Joined: Sat Oct 14, 2017 4:54 am
Posts: 296
Location: Oregon, USA (English)
Enabled wrote:
It wouldn't have to do with knock so much, but ignition advance and fueling will give you clues.

This is a euro 323i?
I just looked through some other maps and I didn't find enough differences, yet.
PM me the partial?


I was thinking knock learned values because:
If I were to make all of the warm files for ign, fuel etc the same as the cold files, i'd think once the engine is actually up to temp it would run either better or worse. Thats hypothetically speaking that if I did do that it would mimic the fast rev/responsiveness and fast rpm drops it has for its first minute of cold running.

Because it does only last like a minute during cold run, i'm wondering if the ICV keeping it at the higher "cold" rpm has anything to do with how fast it revs. Im pretty sure my SAP is disabled, and not sure if that would even effect this anyways.


Top
 Profile  
 
 Post subject: Re: Fast revs and fast rpm drops at vehicle cold temps
PostPosted: Fri Nov 10, 2017 8:09 pm 
Offline
Experienced

Joined: Sat Jan 14, 2017 9:46 pm
Posts: 534
Enabled wrote:
323toslow wrote:
I noticed something the other morning when starting my car cold. Usually I don't touch the gas pedal at all until the car is warmed up considerably.

I barely touched the gas pedal and the vehicle revved extremely fast like insanely fast, and rpms dropped just as fast when I let off of the gas. Just super responsive, I was in shock. What exactly is causing that because I would like to mimic that when the vehicle is at operating temp.



I would start with kf_zwb_sa__n__tkw and kf_zwb_sa_kk__n__tkw (with A/C)

For the decel part at least.

That and cold thick oil.

But attention if you use Ad version! XDF and RR are wrong!

Don't know name of table but if you use Ad version have a look at deceleration tables at table with value of 1000 and degrees until it work for you. For me 400 works with deceleration mod for faster rev drop.


Top
 Profile  
 
 Post subject: Re: Fast revs and fast rpm drops at vehicle cold temps
PostPosted: Fri Nov 10, 2017 10:09 pm 
Offline
Experienced
User avatar

Joined: Sat Oct 14, 2017 4:54 am
Posts: 296
Location: Oregon, USA (English)
Lambda1 wrote:
But attention if you use Ad version! XDF and RR are wrong!

Don't know name of table but if you use Ad version have a look at deceleration tables at table with value of 1000 and degrees until it work for you. For me 400 works with deceleration mod for faster rev drop.


Are you talking about the one in RR named Ignition Retard With Decreasing TPS A/C on / off?
Care to pm me your partial?


Top
 Profile  
 
 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Fri Nov 10, 2017 10:18 pm 
Offline
Experienced

Joined: Sat Jan 14, 2017 9:46 pm
Posts: 534
Right in RR unter deceleration. Tomorrow I can named the table.


Top
 Profile  
 
 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Fri Nov 10, 2017 10:32 pm 
Offline
Experienced
User avatar

Joined: Sat Oct 14, 2017 4:54 am
Posts: 296
Location: Oregon, USA (English)
Lambda1 wrote:
Right in RR unter deceleration. Tomorrow I can named the table.


Ok cool. Thanks


Top
 Profile  
 
 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Sat Nov 11, 2017 2:44 am 
Offline
Experienced

Joined: Thu Sep 25, 2014 4:53 pm
Posts: 627
Location: Houston, TX
I assume he means zyka_hys_sa. Cycle/segment hysteresis for partial throttle deceleration.


Top
 Profile  
 
 Post subject: Re: Reducing revhang...is it possible?
PostPosted: Sat Nov 11, 2017 11:48 am 
Offline
Experienced

Joined: Sat Jan 14, 2017 9:46 pm
Posts: 534
Quote:
I assume he means zyka_hys_sa. Cycle/segment hysteresis for partial throttle deceleration.

Right. In RR: Deceleration => Fuel-Cut _ Hysteresis Delay Counter. Standard value is 1000 in AD.

Quote:
Are you talking about the one in RR named Ignition Retard With Decreasing TPS A/C on / off?

Do you mean about the wrong tables or about the things se above.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 78 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6  Next

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Style based on FI Subsilver by phpBBservice.nl