Volvo K24 turbo in audi application.

[prj]

i dont have to persuade you Dmitri,and as i have figured out already, i wont be able to. As i said, there were changes tried on my boost chip from different tuners as well with same results. I have no idea what they did, but the result was rediculus surge of more than 0.5bar. I suppose those tuners were useless as well according to you....

As i mentioned, car was hitting max torque and boost on motronic after 4500rpm due to the delay in boost and on vems i was having max torque @ 3500rpm on 4th gear and the boost there was 2.0bar and it was there from 3300rpm. In motronic i had about 10Nm of torque less at 3500rpm.

I put all that down to mapping and possibly inability of the motronic to be able to provide this kind of tuning. (although as i said i think its mapping alone)

Also requested boost on my old setup was:
1.3bar @ 2500
1.5bar @ 3000
1.7bar @ 3500
1.8bar @ 4000
1.95bar @ 4500

but that was merely to avoid boost spikes as boost control on megatune wasnt ideal. So i was still getting 2bar @ 3500rpm even though target was 1.7

PS: I am only posting this in the thread to say that GT BB turbos CAN work without surge, if mapped properly and KKK turbos although i like them, are not the only way.People shouldnt be discouraged from a BB turbo just because of surging, because in my case it worked brilliantly. (ok it wasnt a GT28RS or 2871 but i wouldnt put that in a I5 engine anyway. Its too small. With 2bar from 3300rpm its not excactly slow!

Vasilis, the reason for your surge on Motronic and it being down on power is purely bad mapping.
I will PM you.

[Ruffiano]

Here is the log i pulled, Sadly when i attempted to fix my breather system (after the dyno), one of the hoses i pulled off was full of oil, it dumped into the transmission, i tried flushing it, but apparently i didn't do a great job, since the clutch is now slipping.. (spec stage 3+) I actually am planning on pulling the trans this weekend to put in a 6 speed... hopefully something can be done while we are in there.


Remove the .txt to use the file.

[Mcstiff]

You should be able to clean it up since it is not organic.

[Ruffiano]

You should be able to clean it up since it is not organic.

"Carbon semi-metallic friction material"

carbon is organic... but i'm hoping so.

[A80Avant]

log looks quite alright to me!

[Billman]

Here is the log i pulled, Sadly when i attempted to fix my breather system (after the dyno), one of the hoses i pulled off was full of oil, it dumped into the transmission, i tried flushing it, but apparently i didn't do a great job, since the clutch is now slipping.. (spec stage 3+) I actually am planning on pulling the trans this weekend to put in a 6 speed... hopefully something can be done while we are in there.


Remove the .txt to use the file.

you maybe have some trigger errors. At 3 minute you have an RPM jump that has nothing to do with the way the engine works.

Please try to make a log drive at 3000-3100 and press full throttle till 7000. That way we can see how your boost behaves and tell if the dip in the dyno run is caused by this.

[Jamo]

Motronic does not magically make your turbo surge. It's a purely physical process, and your engine management has nothing to do with it.
If you do not get surge on VEMS that means it's spooling slower.
That's pretty damn simple.

Reason you had horrid spool on Motronic, is because your tuner conveniently just set WGDC to 70%, and he did that everywhere for some reason, starting from 900 rpm.
Maybe because he did not know the axis values for the N75 map.
Correct way to map around surge is to set WGDC and target boost lower only in the area where there is surge, not all over the map and mess up spool. And there is no reason to set it as low as 70%... that hurts spool really badly.

In an aftermarket ECU, it would be correct to use gear-dependent boost control.

P.S.
You said you had surge at 2600 rpm. Well, in your Motronic target boost map, at 2600 RPM the target boost is max. Meaning literally "unlimited". I am sure if you do this on VEMS you will have surge too..

What is the realistic max duty WGDC is it 90 or 100%?

[prj]

What is the realistic max duty WGDC is it 90 or 100%?

Most Motronic documents state it is around 95%.
Only way to find out for sure is to use a scope.

[Jamo]

Cheers

[Ruffiano]

you maybe have some trigger errors. At 3 minute you have an RPM jump that has nothing to do with the way the engine works.

Please try to make a log drive at 3000-3100 and press full throttle till 7000. That way we can see how your boost behaves and tell if the dip in the dyno run is caused by this.

that jump might be clutch slipping.

[Jamo]

Good start

Looking at the logfile some clean up in the configuration

Regarding trigger errors: TDC after trigger is 53? is this a new ECU? would expect to see 57 / 58 here
Coil charge time 30!
Map Corr set to 0 needs to be 100

[Billman]

Good start

Looking at the logfile some clean up in the configuration

Regarding trigger errors: TDC after trigger is 53? is this a new ECU? would expect to see 57 / 58 here
Coil charge time 30!
Map Corr set to 0 needs to be 100

@Jamo
are you talking about the RPM/MAP Map Corr? What does it do? I have it set to 0 also.

[Jamo]

It's suppose to be for Alpha N correction but Pnanassy, GintsK and Mattias say it should be set to 100 so that it is ignored in any calculations

I'm sure Vas had a thread on it as well its linked to firmware 1.1.48

[a4kquattro]

Good start

Looking at the logfile some clean up in the configuration

Regarding trigger errors: TDC after trigger is 53? is this a new ECU? would expect to see 57 / 58 here

he dialed in his timing with a light. 53 is correct for his car. it should really be checked for all installations, small variations in flywheel reference pin locations will move TDC from the usual 57/58.

Coil charge time 30!

nothing wrong with that, it tops out at +40% anyway no matter what number you put in there. all that does is change how fast it ramps up under boost.

Map Corr set to 0 needs to be 100

haven't seen anything different with this.

[Ruffiano]

he dialed in his timing with a light. 53 is correct for his car. it should really be checked for all installations, small variations in flywheel reference pin locations will move TDC from the usual 57/58.





nothing wrong with that, it tops out at +40% anyway no matter what number you put in there. all that does is change how fast it ramps up under boost.



haven't seen anything different with this.

Thanks for chiming in Marc, Always enjoy your comments!