is 10.2 a safe afr?
#1
is 10.8 a safe afr?
Is 10.8 a safe afr to be going down to, i was told this was quite a conservative afr on my tune?
and would it be safe for it to go down to 10.2 ?
and would it be safe for it to go down to 10.2 ?
#3
thanks man,
my afr's from 2k to 7k are 12.7 going down to 10.8, what could i do to optimize my performance and still keep it within safety?
it put down 325atw, usual mods on stock MR cams tho, tbe, mbc, fmic, fuel pump etc
my afr's from 2k to 7k are 12.7 going down to 10.8, what could i do to optimize my performance and still keep it within safety?
it put down 325atw, usual mods on stock MR cams tho, tbe, mbc, fmic, fuel pump etc
Last edited by 1mad evo; May 18, 2007 at 03:08 AM.
#4
could some one please explain briefly what should be done to optimize ie what should it be
heres my graph including afr graph
http://www.lancerregister.com/showth...hreadid=153368
heres my graph including afr graph
http://www.lancerregister.com/showth...hreadid=153368
#5
Evolved Member
iTrader: (2)
Based on those images, you do not have a conservative fuel tune. You are around 11.7:1 at peak torque, which is actually a little leaner than some would run on pump . The best thing you could do it flatten the AFR curve a bit. But, your original question was about the taper at redline ... yes, it is normal and quite alright. The added fuel slows the burn and help reduce knock at higher RPM.
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#8
Evolved Member
iTrader: (23)
c6, that is brutal rich, that is bill gates rich.
to the original poster, if you are not knocking that afr looks good .
think I'd throw a little fuel at 3500 rpm to get away from 12.
more in line with 11.5 or so if you can get away with it. knock rules all.
the point is low elevens have worked, but its a mix of timing and afr. if you can get 12 to work on your set up so much the better. you don't want to drop a bunch of timing to save .5 afr.
so check knock and go from there.
to the original poster, if you are not knocking that afr looks good .
think I'd throw a little fuel at 3500 rpm to get away from 12.
more in line with 11.5 or so if you can get away with it. knock rules all.
the point is low elevens have worked, but its a mix of timing and afr. if you can get 12 to work on your set up so much the better. you don't want to drop a bunch of timing to save .5 afr.
so check knock and go from there.
#11
Evolved Member
iTrader: (9)
12.5
is about the most you can get from fuel burn but leaves no margin of safety, esp under boost.
12.0
is slightly less productive, but with more room for error (timing, miss, spikes, whatever) however tune will need to be perfect, water inj or racegas is suggested, and 93 oct would be pushing it
11.5 - 12.0
a good target, with optimal timing however
10.0 - 10.5
- this here are bubba tune, just turn that distributor all the way ( run 10* - 23*) and let the ECU adjust timing for you from the knock. Very simple and very safe if too with proper octane and intact WGA hose. This mode of operation was inbred into the ECU by engineers to accomidate "hillbilly gas" or 89 octane. In fact the factory USDM tune off the dealer lot is indeed a bubba tune, just with less timing.
Back in the days of SAFC (2005 and earlier) people would run leaner and more timing on stock tunes and racegas just by dicking up the MAF signal. One guy was 0.01 seconds shy of 11s with this setup and just a MBC
Thanks
is about the most you can get from fuel burn but leaves no margin of safety, esp under boost.
12.0
is slightly less productive, but with more room for error (timing, miss, spikes, whatever) however tune will need to be perfect, water inj or racegas is suggested, and 93 oct would be pushing it
11.5 - 12.0
a good target, with optimal timing however
10.0 - 10.5
- this here are bubba tune, just turn that distributor all the way ( run 10* - 23*) and let the ECU adjust timing for you from the knock. Very simple and very safe if too with proper octane and intact WGA hose. This mode of operation was inbred into the ECU by engineers to accomidate "hillbilly gas" or 89 octane. In fact the factory USDM tune off the dealer lot is indeed a bubba tune, just with less timing.
Back in the days of SAFC (2005 and earlier) people would run leaner and more timing on stock tunes and racegas just by dicking up the MAF signal. One guy was 0.01 seconds shy of 11s with this setup and just a MBC
Thanks
#15
Evolved Member
iTrader: (3)
You need to flatten that AFR more. The taper you have going on is a little out of hand. The AFR @ peak torque(3000-4000rpm) can be as lean as 11.5:1 on pump gas, then slowly taper to 11.1:1 after 6800rpm or so. Continue that AFR until rev-limiter. THis is actually very safe and is a good proven AFR. It's a good trade off between safety and power.
But, your question was asking if it was safe, YES your current tune is safe....very safe. If you are asking to tune even richer, i would not do that. You can actually cause a knock condition if you are running too rich. If you do anything, do what i recommend.
Good luck!
CJ
But, your question was asking if it was safe, YES your current tune is safe....very safe. If you are asking to tune even richer, i would not do that. You can actually cause a knock condition if you are running too rich. If you do anything, do what i recommend.
Good luck!
CJ