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Author Topic: Actual pre-control in LDRPID  (Read 310491 times)
damianalex
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A4 B7 1.8T 8E0909518AQ 0020


« Reply #330 on: January 03, 2025, 02:31:57 PM »

Use KFLDRAPP to find the optimal boost and VVT switchpoint first.
After that is done, set your VVT switchpoint like it should be.

Then make the logs with VVT behaving like it will be in the end.
If you make the lin runs with VVT strictly off it won't work at all because the turbo spools much better with VVT on due to overlap.

Calibrating the boost pid is always the very last thing you do. You must have already have the correct boost level found that you are going to run, the correct VVT settings, fuel enrichment and timing.
Simply use KFLDRAPP for that, and when everything is finished THEN it is time to tune the boost pid. It reacts heavily to changes in EGT and VE.

It is my first tune, so I'm still learning. I did duty logs before I know how to tune VVT  Cheesy
Now VVTs changing point is set to 4500rpm and I don't see change to engine load at log, so maybe it is right point.

What do you mean "optimal" boost?

I've already corrected VE model. I think I also should correct EGT model, because enrichment from BTS it to high. I don't have EGT sensor so I'm little sceared to lower it from stock Tongue

My set: Audi A4 B7 1.8T + hybrid K03 turbo + 200cpsi 110mm cat + metal tip + fmic + 430cc porshe inj (fpr 3 bar+boost), BUT STOCK rods (so I must be careful with high boost at low rpms)
Now with VVT on I measured that I can make about 1bar at 2250rpm, stock rods can handle that? Huh


My log at 3rd gear with 98 octane (I have already lowered a bit KFZW to avoid retard at 6500rpm):


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