I am trying to gain mileage and currently tuning partial throttle loads (80-180). For now I am shooting for 15.2-15.8 under cruise conditions. But what about partial throttle low boost runs, up to 10psi.


So I would like to ask people who have experience in that field how lean can you go on partial throttle, say from 1 up to 10-12psi? The goal is to maintain good mileage and torque under part throttle low boost runs, as these are the most common conditions that the car see every day.

 

I'm not an expert unfortunately, but I did some research on this the other day as I have similar questions. I found a thread on DSM Tuners in which the consensus was similar to this:
1-5 psi: 13:1
5-10 psi: 12.5:1
10:15 psi: 12:1
15+ 11.5 or lower, depending on many factors (and you're most likely at or very near WOT at this point anyway).

That's about where mine runs and it seems strong and gas mileage is acceptable, 22 to 24 mpg with about 80/20 hwy/city. I don't see any knock at those AFRs. I'd love to have an EGT gauge to see what those numbers look like under these conditions but, alas, I do not have one. Mods are in sig.

HTH, also, subbed

 

Currently I am running ~13-13.5 at 3-5 psi, ~12.8 at 7 psi, ~12.5 at 10 psi and looking forward to lean it out a bit more.

My EGT is fine, and never peaks more then 650-700C* at this boost level. No real knock. Sometimes false knocking up to 4 knocks.

I can manage the same mileage at hwy driving. But as far as I am driving in the city traffic mostly, 22 mpg is unachievable for me.

 

Any other opinion?

 

Edit: Sorry I misread you!