Stall / Idle Surge Turbo FRS

[tomm.brz]

SD VE doesn t look too good at low load
try to make it similar to the bottom table (yours is at top)
don t look over 1bar of map as it s a very different smaller turbo
but under 0.9bar should be a good start




Also, you re using a wideband but during low rpm and low load the car still uses the oem lambda and you still have stock shitty scaling
So please rescale it more like on the bottom:




from 2017 subaru rescaled it also in oem tunes, if you want you can use this instead:

[DarkPira7e]

@tomm.brz Damn man, thank you! I'm not going to mess with the cam timing and PI mani pressure comp because I don't know enough to balance the VE (I'll leave it to my tuner to play with when it's back on the dyno) but I'm going to adjust almost everything else with the info you've provided me- we'll see how it goes!



My only concern is that the lambda scaling- the reference numbers on the left are different. I adjusted mine to imitate the curve (I think that's what you meant) so we'll see if the AFR is seriously goofy, or if imitating the shape was good enough.

I will say, regardless of the tuning strategies being different, the car drives excellent over 3k RPM and is a serious machine.

[tomm.brz]

yes for the lambda you can copy totally the K00C one i posted, every resryling car has now that scaling, it changes only at afr lower than 12.16 so it s even out of the zone you use in closed loop, regardless is a good idea as it can then go to 11

[DarkPira7e]

Originally Posted by tomm.brz

yes for the lambda you can copy totally the K00C one i posted, every resryling car has now that scaling, it changes only at afr lower than 12.16 so it s even out of the zone you use in closed loop, regardless is a good idea as it can then go to 11

So far, just changing the VE a little, the idle stability map and the idle timing has totally resolved the fluctuating RPM! I'll work with my tuner to massage the other improvements into the mapping. Thank you so much for your help

[tomm.brz]

do also the racerom upgrade, you can do it by urself, it will reset all the racerom tables but you can then copy paste them, 12.1 works better than racerom 10

[DarkPira7e]

Originally Posted by tomm.brz

do also the racerom upgrade, you can do it by urself, it will reset all the racerom tables but you can then copy paste them, 12.1 works better than racerom 10

What about it works better? I am curious if there's a way to quantify the improvement by something measurable. I just copied everything over so we'll see. Just happy to have my idle sorted out, we're still a ways from actually cleaning up the rest of the tune. We're going to be making a return style fuel system so we can actually have the fuel pressure rise with boost (not just messing with the tuning to emulate it) so we'll be on the dyno, not much sense playing with the map until then since it runs fine now, just needed the idle sorted

[tomm.brz]

it just to be sure that all SD and flex and extra stuff they put works good and in 12.1 i still havent encountered any bug or ecu crash because of custom inputs or custom maps as it happened to me with rr 10
it takes 5 min to upgrade so worth it

The table about PI compensation is not "messing around" it is a very importqnt table in the injection strategy, as you can see also in stock form they don t just put everything to 1 but it s directly proportionate to relative pressure. i think it s an error what he s doing and ecutek also talk about the importance of this table in their pdf
Every single tune i saw, every tuner rescale this table to raise with boost

1050x injectors should be ok for at least 600hp with e85 without changing anything in the fuel pressure regulation system, what your tuner is doing by flattening that table is let the ecu miscalculate the injection opening time really required, so then you get unrealistic engine load and g/sec calculation and you could hit limits that are hard coded into ecu or something like that and you dig into more strange troubles

remember this is NOT a wrx and shouldn t be tuned like it is, and DI is more important than PI