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AFR's who's running what
Posted: Tue Feb 12, 2008 9:42 am
by 16bit
I am really interested to see what afr's people are running - in particular forced cars. I am running 12.5 atm but it could apparently go leaner.
Posted: Tue Feb 12, 2008 10:30 am
by Steampunk
On the dyno day last saturday that you piked on
, the Mazda3MPS'ses and a Holden Astra HSV VX-R were showing up between 12.5 to and 11.5 on average.
The VX-R got all the way down to 10 nearing redline.
I think all of them had standard EMS tuning, and the power @ wheels they were making match their claimed power at the flywheel.
Why would you go leaner? The most powerful 3MPS (152kw@wheels) had the richest mixture out of the lot.
Posted: Tue Feb 12, 2008 10:49 am
by GP
I think we need a FAQ for all these abreviations
Posted: Tue Feb 12, 2008 11:36 am
by 16bit
thats funny
Well leaner generally means more power. But if I go too lean i will definitly need to upgrade my rad. I spose when it gets that tensioner thing sorted i will have more then enough power for no lsd.
Posted: Tue Feb 12, 2008 11:43 am
by Juffa
As some of you know I'm running a FM/Link ECU. I'm using the AFR targets as set in the FM install manual. These may be adjusted when I finally get her on a dyno.
My current targets are:
140Kpa - AFR=12.5
180Kpa - AFR=11.5
227Kpa - AFR=10.5
The above boost levels are the centres of my ECU pressure tables while under boost. My wastegate currently opens at 160Kpa.
J
Posted: Tue Feb 12, 2008 12:01 pm
by 16bit
so would you be running 23 psi?
Re:
Posted: Tue Feb 12, 2008 1:31 pm
by Juffa
16bit wrote:so would you be running 23 psi?
No
....around 9 pounds, on stock internals....
J
Posted: Tue Feb 12, 2008 2:42 pm
by 16bit
how come the internets conversion dooies said that it was 23psi at 160kpa?
Re:
Posted: Tue Feb 12, 2008 3:40 pm
by blackster
AFR = Can of worms.
For what its worth 11.8 under full throttle.
Re:
Posted: Tue Feb 12, 2008 3:43 pm
by Juffa
16bit wrote:how come the internets conversion dooies said that it was 23psi at 160kpa?
Don't know the answer to the question...but I know that when my boost gauge is showing 9 pounds, the ECU display is showing 162Kpa and there is a conversion table in the FM tuning guide that shows 162Kpa as being 9 pounds.
According to the same table 227Kpa is about 18.5 pounds.
J
Posted: Tue Feb 12, 2008 3:50 pm
by 16bit
cool - i think i will be around that 9 psi once the tensioner is sorted.
Re:
Posted: Tue Feb 12, 2008 7:27 pm
by Matty
Juffa wrote:16bit wrote:how come the internets conversion dooies said that it was 23psi at 160kpa?
Don't know the answer to the question...but I know that when my boost gauge is showing 9 pounds, the ECU display is showing 162Kpa and there is a conversion table in the FM tuning guide that shows 162Kpa as being 9 pounds.
According to the same table 227Kpa is about 18.5 pounds.
J
absolute vs gauge pressure.
Posted: Tue Feb 12, 2008 9:15 pm
by timk
As Matty said, ~100kpa = 0psi absolute.
My AFR target table is 11.8:1 in boost.