SPRAYED 01

iTrader: (22)

Im currently running 15.5psi using a sd tune and 2 bar sensor. My tuner mentioned that im maxed out at this level due to running pump gas. We had to lower the timing to about 15 total to eliminate all knock.

Im thinking of adding a meth kit and running 18psi out of my tc78. Can you tune the car on a 2bar at 18psi? I know 2 bar is 14.7 but ive heard of people running more as am I at 15.5psi but I wanted to dicuss any possible issues.

Thanks
Alex

Johnv

Should be ok at 18psi, your just stuck with the same timing and fueling as you would at 14.7(the limit of the 2bar sensor) you will likely be running a bit rich at 14.7 psi with a little less timing than it could maybe take so as your safe at 18psi.

dudeman

iTrader: (43)

what heads and cam are you using to make that kind of power?

black98ws6ta

iTrader: (77)

Why not just throw a 3 bar sensor in it and tune?

SPRAYED 01

iTrader: (22)

I'm running a 226/228 .600/.612 on a 115lsa with p/p 241s.
I could just throw in a 3 bar but I understand its harder to tune and I was
Just wondering if you could run a 2 bar up to 18psi

98Z28CobraKiller

iTrader: (17)

Yes you can but as stated, you will have to tune the 210KPA line on the VE table based on 18 psi which may run rich if you were to back it back down. This would be less noticeable with a BRFPR. The additional fuel pressure at higher boost might be close but it still needs to be retuned.

DeltaT

iTrader: (5)

Most 2-bar sensors will be correct up to around 18-19psi. It is a myth that they stop registering right at 14.7psi above atmospheric. Best to stay with the 2-bar as long as possible as your TPS resolution is finer than with a 3-bar. The 3-bar would leave you with less resolution and a bunch of range unused at 18psi or less.

Jim

engineermike

If you add meth, you shouldn't need to change the tune at all. Just let the meth supplement the fuel above 15 psi. Why overcomplicate things and change the tune?

qqwqeqwrqwqtq

Every one I've used in the past is absolutely maxed at just under 16psi.

No advantage at all to using 2 bar. 3 bar resolution is excellent.

W8N2SQZ

iTrader: (6)

Jim, what 3 bar map are you using?

BLOWNBLUEZ06

iTrader: (17)

18Psi on a 2 bar here. Tune up to 210Kpa which is a little more than 14.5psi (~16psi) and then when it runs out, you still have RPM to work with. It's much easier with a centrifugal since boost increases with RPM.