installed mtune
04-11-2012, 01:50 PM
#31
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This weekend I'm going to run a voltage wire from my Innovate analog out plug to the stock 02 plug and see how that evens things out....
04-11-2012, 04:37 PM
#32
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The typical consensus with my Lambo & Ferrari TT owner buddies is that on 93 octane, 11.8 is the ideal: rich enough to be safe in case you have a lean cylinder, lean enough to make power w/o too much fuel.
I think the idea is to get it as close to 11.8-12:1 while on-boost. Mid or Mid/low 13's while building boost sounds right.
As far as idle goes, I get the strongest vacuum signal if I'm idling in the mid 13's. Yes the car will idle much higher, even low 15's w/o issue, but the vacuum number might be 2 inches lower.
I think the idea is to get it as close to 11.8-12:1 while on-boost. Mid or Mid/low 13's while building boost sounds right.
As far as idle goes, I get the strongest vacuum signal if I'm idling in the mid 13's. Yes the car will idle much higher, even low 15's w/o issue, but the vacuum number might be 2 inches lower.
04-11-2012, 05:30 PM
#33
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The typical consensus with my Lambo & Ferrari TT owner buddies is that on 93 octane, 11.8 is the ideal: rich enough to be safe in case you have a lean cylinder, lean enough to make power w/o too much fuel.
I think the idea is to get it as close to 11.8-12:1 while on-boost. Mid or Mid/low 13's while building boost sounds right.
As far as idle goes, I get the strongest vacuum signal if I'm idling in the mid 13's. Yes the car will idle much higher, even low 15's w/o issue, but the vacuum number might be 2 inches lower.
I think the idea is to get it as close to 11.8-12:1 while on-boost. Mid or Mid/low 13's while building boost sounds right.
As far as idle goes, I get the strongest vacuum signal if I'm idling in the mid 13's. Yes the car will idle much higher, even low 15's w/o issue, but the vacuum number might be 2 inches lower.
That has been the consensus as far as I can remember 11:7
04-11-2012, 05:59 PM
#35
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I know from speaking with Josh, and he will probably offer insight on this, the a/f is important of course, but the exact number is very different for timing considerations. Which is now the main stay in 3D mapping and the use of the MAP sensor for boost read timing.
That is why the old school chips just dumped a bunch of fuel on the top end/full boost because they had no means to adjust timing based on boost/load.
That is why the old school chips just dumped a bunch of fuel on the top end/full boost because they had no means to adjust timing based on boost/load.
04-12-2012, 11:02 AM
#37
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Running a bit lean at idle is not something to worry about. I've noticed when the car is hot my idle will jump around 15.5-16.5.
FWIW, I did notice at the track a couple weeks ago I was running rich (even after I had got the AFRs exactly where I want them)...wonder if I should check my vacuum lines.
But yes as others have said, ideal AFR at boost or near-WOT is ~11.7. Back when I was tuning the car on the Mass Pike on my way to work [don't worry -- at the hours I was going to work, no one was on the roads!] was really experiencing noticeable gains by leaning things out to 11.7. For safety reasons, I wanted to make sure I was at 11.7 by the time I was at ~3/4 throttle and ~11 lbs of boost. I think I may even be a bit more conservative than that; keep in mind that your car doesn't need to be at 16lbs and WOT in order to explode...
FWIW, I did notice at the track a couple weeks ago I was running rich (even after I had got the AFRs exactly where I want them)...wonder if I should check my vacuum lines.
But yes as others have said, ideal AFR at boost or near-WOT is ~11.7. Back when I was tuning the car on the Mass Pike on my way to work [don't worry -- at the hours I was going to work, no one was on the roads!] was really experiencing noticeable gains by leaning things out to 11.7. For safety reasons, I wanted to make sure I was at 11.7 by the time I was at ~3/4 throttle and ~11 lbs of boost. I think I may even be a bit more conservative than that; keep in mind that your car doesn't need to be at 16lbs and WOT in order to explode...
