a/f ratio

pajeroturbo · Post by **pajeroturbo** » Sun May 28, 2006 4:41 pm

Hi there to all I am just making this topic to ask all you what is the a/f ratio that you are using at your engines for 14-20 psi of boost so that it can make maximum power and it can be safe for the engine too. And how much timing are you using at this boost with pump gas.

Starion VR4 · Post by **Starion VR4** » Sun May 28, 2006 5:46 pm

Thats a loaded question. A/F for boost should be 11.7-12.7 in power for safety, cruise 14-15.2, tiing depends on a lot, in my engine i ca use at 3500RPM 27deg, 35 at 6000RPM , it all depends on how cool the inlet temp is, the hotter it is, the more likely to detonate, when I was in snow I could run 40deg at 4000RPM with air inlet temp of 10deg C. Must also add, I have aftermarket ECU. :beer

CussCuss · Post by **CussCuss** » Sun May 28, 2006 6:33 pm

Most people consider 12:1 to be a safe tune and around 12.5:1 to be a 'power' tune.

mrb1 · Post by **mrb1** » Sun May 28, 2006 6:56 pm

AFR for turbo should be 11.5 to 11.8 full load.
N/A should be around 12.7-13.0 (maybe a little leaner if you know the engine).
These are general safe numbers. A turbo engine may make a little more power leaner but it not worth it for the extra risk of detonation.

No way you should run 12.7 AFR on a turbo it will detonate for sure, maybe not today or tomorrow but it will eventually

NXTIME · Post by **NXTIME** » Sun May 28, 2006 10:42 pm

I was running 10.8:1 and only +13 degrees timing. Made 482rwhp@16psi very mild tune ;)

pajeroturbo · Post by **pajeroturbo** » Tue May 30, 2006 4:59 am

does anyone know what the stock timing advance is?

Junkers · Post by **Junkers** » Tue May 30, 2006 9:37 am

8BTDC

pajeroturbo · Post by **pajeroturbo** » Wed May 31, 2006 2:22 am

i know that i mean about the timing advance curve at WOT with vacuam and with boost.

Austarion

a/f ratio

a/f ratio

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