4.69 was the fuel trim on that log ... maf voltage wasn't logged .

Ahh, just a coincidence it was the same number as the max OE MAF map voltage number then, lol

Virtual dyno of first log


https://cimg9.ibsrv.net/gimg/www.rx8...20b2b8e1ab.png

maf and load vs rpm

https://cimg3.ibsrv.net/gimg/www.rx8...2a89496610.png

Comparing it to a NA dyno, it looks like you are making more power from 3k rpm on. It's a virtual dyno, so take it with a big grain of salt, but 10psi+ at 4k is nothing to sneeze at.

As you tune it out, you may get an earlier spool as well.

^ i agree

I think .83 A/R combined with the following should lower spool by by 1k rpm or so

https://youtu.be/UQpSdFlGhus

Yeah ... it's not terrible spool up ... just not anywhere near what I had hoped for .

so you have the wastegate close at 1psi then reopen at full boost?

maybe i am missing something, did you try just running the wastegate like normal?

is your ssv opening later or like OEM on this tune?

15 years ago maybe

Best decision ever~!

It's just set up normally but with a 4 port valve so it is powered closed as the turbo spools up

Have not tried touching anything on the tune yet .... It's opening at 4000 as before .

Getting there . This one at 16psi ... loads at 220% . No wastegateing issues as yet

https://cimg3.ibsrv.net/gimg/www.rx8...4d57ac2375.png

I will be trying a small mod to the manifold instead ;)

Go on......

頑張ってブレッテス、頑張って！

The 0.83 idea will definitely improve spoolup but the effect top end will be a double whammy kinda deal . Less power due to higher backpressure at turbo AND siamese .

Gunna concentrate on getting the pulse energy back from the siamese port .
Don't feel like an argument over why it wont work right now . So I'll see if it does then post.

You will need higher backpressure at the center port for effective boost control though. At your power level for that turbo I don't think the "whammy" is as much as you think it is.

But good luck with whatever direction you go from here.

Having 10psi at 4k with a lot of headroom is different from having 10psi at 4k with no headroom. This is new and the results are promising.

If he's controlling at 16psi then he does have sufficient backpressure on the wastegate. Scavenging some from the center port will be a tiny effect on the backpressure the wastegate sees. I'm more worried about crossover to the other side dropping efficiency, but we'll see what happens soon.

Thank you for recognising this .

One half of the goal is already achieved pretty much .... if I can get close on the other half (by improving spool), I think I can just about be justified in removing the question mark on the thread title.

^^choosing to ignore silly commentary ...

Not only can I control 16 psi ... but down to 4 psi as well . If I put a 4 psi spring in and switch off the EBC.... I get exactly 4 psi all the way to redline .

I currently have a 6psi spring in and can dial up whatever boost I want .... that 4 port valve really is doing the trick !

I like where your mind is - which scroll are you going to direct it to?

The one that passes by very closely (front rotor)