Afr numbers
 

like to see what people have for afr numbers on there na bbc
i am at 14.5

watching

I hope that is at idle. That's way to lean under load

12.1 wot

Nope at Cruz 4k goes to 14 at wot I think my gauge might be bad as it ran at 16 last year wot and have not melted it down

The consensus of the brain trust in the tech section *circlejerk was happy keeping it in the 12s with the EFI folks being happy with it in the lower 13s. Subtract a full point for boost applications.

*circlejerk was a handy and fun resource but seems to have disbanded after the recent overhaul.

On a natural. Marine motor I like 13s on cruze and mid 12s at full load , just my opinion. Good luck

Okay changed primary Jets from 83 to 84 stock is 82 secondaries where 92 went to 94's which is stock installed 6.5 power valve had a 5.5 noticed the bowl behind the power valve was dry not sure if it's supposed to be like that

ordered a new digital afr meter was using an analog one needle type there were some complaints of it locking up at 14.2 which has happened to me auto meter said could be bad ground or bad power at times the needle would clock for five or six minutes before reading the value or if I cycled the motor on a restart the needle or gauge would read

looked at my Dyno paperwork afr was 12.1 to 14.2 rpm is 3500 to 6000

Ibut I did change intakes this year went to a brodix hvh high rise runners

dyno intake was a med rise short runner Merlin intake with small runners

14's?? yikes!!

I run full time widebands, I see mid to high 12's cruising, 12.2 ish WOT... if it varies a ton you might wanna have some carb work done... AF should not change that much throughout powerband...

So are you saying that with a Procharger EFI application you should be.looking for low 12's @ WOT? Working on tuning mine now so just curious.

I have zero qualifications to say anything, but this will keep you busy for a while.

http://www.offshoreonly.com/forums/g...n-engines.html

I will try to address several points here:

1) Is your wide band calibrated? Most require a simple a free air calibration prior to use. If not done you are likely getting bogus numbers.

2) IF you sensor is calibrated then 14.5 at idle would be ok, but I think the engine would respond better at 14.0 ish at idle.

3) IF you are at 14+ at cruise then at a minimum you are likely down on power for that rpm, and more importantly on the ragged edge for engine issues.

4)IF you are truly at 16 at WOT you are giving up a LOT of power and shortening up time on the water as your motor will likely disassemble itself at the most inconvenient time. I've run 16+ at IDLE during tuning and the motor doesn't really like it at all.

The vast majority of N/A engines like 12.8 for a good max HP AFR, with marine motors adding some cushion and running 12.5 or richer at WOT.

I would not run more then 11.8 tops with boost in a boat.... or even my cars on street are set to not exceed 11.8 for that matter..

I tune for 11.2 on my boosted 9:1 street engines at 7 psi and above