Wastegate spring - Anybody on here?

[Thuppu]

you must have non standard motronic here(re-mapped or chipped)

Yes, it's remapped and with 1.7bar max boost. Bigger turbo, tubular ex-manifold, rs2 injectors etc...

[prj]

you must have non standard motronic here(re-mapped or chipped)

Yeah, his is custom mapped.

EDIT:
Just saw Thuppu already replied

[A80Avant]

you may have banged your head for a month, but the person doing my map has been tuning motronics for years, and he is well known in germany as well. That is what suprised me that the boost could not be handled appropriately.

[andy wilkins]

I do provide instructions with springs i sell pointing out what is involved.

Its worth also noting that although they can be used with a custom mapped s2 ecu they are designed for the ur quattro which does not in wr specification use the electronic boost control.

The wastegate gap is adjustable in that installation.

Regards

Andy

[prj]

you may have banged your head for a month, but the person doing my map has been tuning motronics for years, and he is well known in germany as well. That is what suprised me that the boost could not be handled appropriately.

Yet he does not know where the injector constant is or how the fuel map works.
The reason you had bad spool, was because in your software duty during spoolup was set to 65% instead of 95%, like it should be set.

[Billman]

can you give us a map of lets say a stock RS2 DC VS RPM vs load values.

Spool up 95%
0.5 bar 75%, 0.8 bar 70 etc ?

[prj]

can you give us a map of lets say a stock RS2 DC VS RPM vs load values.

Spool up 95%
0.5 bar 75%, 0.8 bar 70 etc ?

I could, but in the evening.
The duty is a reference point for motronic. It can adaptively control it within limits and it stores that information in fault memory afaik.
The duty map is the usual WG curve. 95% until 2000-2500 RPM, then it gets lowered and towards the end as more duty is needed to maintain boost pressure it is raised again.
Because a such map can not account for all the gears, boost control is adaptive and it "learns" continuosly. But of course, the base duty has to be more or less correct for it to work well.

In Vasilis' software the highest duty there is, is about 65%. It seems like the tuner lowered entire last 2 columns of the map because it overshot instead of adjusting each cell. Maybe he didn't know which cell are what revs?
Just my speculation. There is a lot of other things done wrong in that software.

[A80Avant]

that is what im trying to say Dmitri. Once put to 96% as you say, the boost fluttered about 0.5bar difference continuesly before settling to the specified boost after 5500rpm

all map was done on the road and on the fly. NOT by mail!So we tested all options and the only way to be able to avoid surge was to tune it like that. While in Germany, the car behavied nicely and even when i got back home, (Greece) and we updated the boost to go higher. it did work nicely. BUT later than what the turbo was capable of. With VEMS, i tune boost excactly as you say(higher DC early in revs and gradualy lowering it) and PID control takes care of over/under shoots. BUT i had no problem having higher boost much sooner with VEMS and no surge on lower gears, while i did have some minimal surge on 6th gear.

[prj]

that is what im trying to say Dmitri. Once put to 96% as you say, the boost fluttered about 0.5bar difference continuesly before settling to the specified boost after 5500rpm

No.
This is because the duty cycle is distributed wrong in the rev range!
Your tuner tuned entire column, not individual cells.
So of course if you set 96% duty at 3500 RPM your boost is going to fluctuate, since it'll overshoot then overcompensate.
The reason for bad spool is the wrong D/C. Period.

If your tuner was so good, he would have tuned your injector latency, the injector constant and the fuel map correctly.
Those values are untouched in your tune, instead the entire fuel map is lifted "up". Those values are the first thing you change when you tune for bigger injectors on any engine management system.

P.S. If you still don't believe me, I can send you some comparison shots with proof

[A80Avant]

it is not that i dont believe you, but the fact that many people have been tuning that way succesfully that way for ages in motronic, doesnt necesseraly make it wrong. Obviously if there is a better way to tune, i am up for that, and if i had all this knowledge about motronic back then i may have mentioned these fact to him. BUT with all the cars he has tuned with great results so far, doesnt make him a bad tuner. Otherwise people wouldnt be using him.

Same thing goes for aftermarket ECUs. I can tell you easily that over 90% of the tuners out there dont give a f#^%@& about simple things when tuning such as idle control, A/C use, cold start etc. because most people are only interested in making sure it maks hp and it is safe. BUt as far as i am concerned that is not all you tune. Many tuners have made a big name tuning just like that in Greece at least, and they have a good reputation, but when you start the car you have an idle of 1500rpm and you cannot go for an MOT.