Is my A/F ratio ok?
07-21-2006, 06:35 AM
#1
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Is my A/F ratio ok?
I tried to set my A/F yesterday with my power perfect piggyback.. Wow it's really difficult to get the A/F exactly as you want it with that box!! Anyway, I thought I'd run a few of my numbers here and see if I'm on the right track..
Cruising with low load my A/F is around 14-15:1
On WOT starting at ~3000 rev the A/F begins at 13.1:1
3500 - 13.7:1
4000 - 12.5:1
4500 - 12.4:1
5000 - 11.9:1
5500 - 12:1
5800 - 11.5:1
Is 13.7:1 at 3500 too lean?
Cruising with low load my A/F is around 14-15:1
On WOT starting at ~3000 rev the A/F begins at 13.1:1
3500 - 13.7:1
4000 - 12.5:1
4500 - 12.4:1
5000 - 11.9:1
5500 - 12:1
5800 - 11.5:1
Is 13.7:1 at 3500 too lean?
07-21-2006, 07:31 AM
#2
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It depends how your turbo spools. 13.7:1@3500 is probably way too lean. I assume your turbo is spooled up by then. I would shoot for ~11.8 as long as you are under full boost.
07-21-2006, 12:27 PM
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"Is 13.7:1 at 3500 too lean?"
if your turbo is still building boost at 3,500 then it will help spool faster. But as stated above, if you are at full boost around 3,500 then that is too lean.
if your turbo is still building boost at 3,500 then it will help spool faster. But as stated above, if you are at full boost around 3,500 then that is too lean.
07-21-2006, 03:55 PM
#7
Instructor
Thread Starter
I skipped out the boost log in my zeitronix order so going through my logs doesn't give me much info really! 
I'll take more notice of the boost next time I'm out dialling.. in short the A/F should be something inbetween 11.7 - 12.4 when under full boost, right?
I'll take more notice of the boost next time I'm out dialling.. in short the A/F should be something inbetween 11.7 - 12.4 when under full boost, right?
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07-21-2006, 04:17 PM
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Slightly lean initially to generate hot exhaust which will help with spool up; around 13:1 dropping to 11.5:1 at max boost is safe. 11.8:1 will get you slightly more power while still being quite safe. I don't think there is any noticeable power to be had by going leaner than ~11.8:1.
It would be much easier to comment if you had a boost log.
It would be much easier to comment if you had a boost log.
