Please look at my post here: http://nefariousmotorsports.com/forum/index.php?topic=2418.msg22745#msg22745

16bit lohi, 1D744, 0.000111

I have ran some different tests, and I have found the problem. The problem is the stock axis, it is way too short and when I run above/under the axis the ECU will extrapolate the curve, I believe this is done to prevent the mixture from running uber lean in the basic calculation if the boost would spike or just being able to build alot higher than requested in the stock calibration(0.6bar boost in my case).

It does however seem to hit a roof at ~2150mbar, I would suspect this is some 8bit cap but im not too good regarding that stuff.

Here is a fast cook up I did:


Which resulted in this:


I will refine this with better calculations and post the results.

Forget about my last posts. The stock axis IS correct, however my definition was wrong and showing the axis divided by 4.

I changed that up and started tuning, and even with the right calculation from the FR I was getting bad results. I now have it pretty much spot on after ALOT of trial and error.





Im attaching a small excel sheet I made to calculate the FRLFSDP and KRKTE, if someone is tuning a returnless system please try it out and see how it works for you.

i have tri to use it, but probably I made a mistake

Dan,

This map is only for cars with returnless- static fuel pressure. They need compensation in the required fuel mass modeling because the effective flow rate changes with intake manifold plenum pressure.

Your TT has a 1:1 ratio fuel pressure regulator- as such, the pressure delta between fuel being injected and the air stays constant. This means that no correction is needed and that is why your table is 1.00 everywhere.

You probably won't see this as it's an old post but might as well answer the question for posterity's sake.

Fuel pressure change will also affect to TVUB values. So you must also correct those as well.