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Old 05-05-2010, 01:58 PM   #1
Jamie Mac
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Maggie with tune

.
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Last edited by Jamie Mac; 08-23-2012 at 12:24 AM.
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Old 05-05-2010, 07:26 PM   #2
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Very cool. What do the numbers that are in the 14's in the dyno sheet represent?
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Old 05-05-2010, 07:37 PM   #3
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wish i had one.
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Old 05-05-2010, 07:59 PM   #4
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Quote:
Originally Posted by SonnyakaPig View Post
Very cool. What do the numbers that are in the 14's in the dyno sheet represent?
Air Fuel Ratio. . . ?


Very nice numbers Jamie. . so you are looking at 531hp at the wheels?
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Old 05-05-2010, 08:32 PM   #5
MikeW
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I am not an expert by any means, but I have an understanding.
For gasoline engines the optimum Air Fuel Ratio (AFR) is 14.7 parts air per 1 part fuel. This will cause total combustion of the fuel, thus delivering the most power.
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Old 05-05-2010, 09:02 PM   #6
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That had better NOT be an A/F ratio! While stoich (14.7:1) is fine for an NA car at reasonable compression ratios, it is not good for a boosted car to be running that lean!!
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Old 05-05-2010, 10:13 PM   #7
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That had better NOT be an A/F ratio! While stoich (14.7:1) is fine for an NA car at reasonable compression ratios, it is not good for a boosted car to be running that lean!!
That's right off the kick.. The dyno is printing the highest number .. Looks to be 12.1 or 12.3 ... "For me" still high for boost .. Pray the wide band is nuts on...I like to leave a buffer zone 11.2-7 max

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Old 05-05-2010, 10:47 PM   #8
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Ok guys since it's my car please elaborate some more. Thanks
If it was my car I would have my tuner add some fuel.... As a tuner I run 11.2-11.7 AFR max for boost.. But that's me.. When I get to a computer I will explain more.. My iPhone screen is not working well!!
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Old 05-05-2010, 11:00 PM   #9
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Yea you need more fuel mid 11 is just right for boost yours is in the 12s not that bad. But to be on the safe side tunes should all ways be in the 11s.
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Old 05-05-2010, 11:21 PM   #10
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For me the best air to fuel Ratio is one that is not perfectly flat its good to start out a little lean and as the rpms go up to get ritcher.
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Old 05-05-2010, 11:51 PM   #11
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That's right off the kick.. The dyno is printing the highest number .. Looks to be 12.1 or 12.3 ... "For me" still high for boost .. Pray the wide band is nuts on...I like to leave a buffer zone 11.2-7 max
Good info, Will. I figured it was A/F ratio, but I was hoping it wasn't in the 14's throughout the dyno run. I can't believe I didn't notice that it only started out at 14 and then went down. My bad.

Is this an L99?

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Old 05-06-2010, 07:53 AM   #12
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Quote:
Originally Posted by Will@Apf View Post
That's right off the kick.. The dyno is printing the highest number .. Looks to be 12.1 or 12.3 ... "For me" still high for boost .. Pray the wide band is nuts on...I like to leave a buffer zone 11.2-7 max
Yeah I saw that but what has me nervous is, the RPM is 2600 approx and it is running at that A/F ratio. Even in the NA world that is kinda lean. Now I know it may not be on boost at that point but it makes me nervous as boost can hit in a heartbeat and it takes approx 400rpm to get into the 12 range... but I guess it could be pulling timing to avoid detonation.

To the OP. Are you running meth or the like?
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Old 05-06-2010, 08:54 AM   #13
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Jamie is not running Meth right now. . Not sure if it was in his plans to do so, but at those AFR, there is no other additions to the car.
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Old 05-06-2010, 09:25 AM   #14
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Quote:
Originally Posted by hypurone View Post
Yeah I saw that but what has me nervous is, the RPM is 2600 approx and it is running at that A/F ratio. Even in the NA world that is kinda lean. Now I know it may not be on boost at that point but it makes me nervous as boost can hit in a heartbeat and it takes approx 400rpm to get into the 12 range... but I guess it could be pulling timing to avoid detonation.
It's fine...
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