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Forte500
 
Join Date: Jun 2010
Location: Greenwich
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AFR readings normal?

Put in AFR gauge this past weekend......pointer stays perfectly in range 10.5 - 11.5 in 3r - 5th gear (G50)....1st in 2nd reads 14+ on full boost. I suspect it's because the readings don't have time to normalize in lower gears but wanted to see if anyone else observed this??


Motec maps show everything is normal...

Old 05-31-2012, 07:25 PM
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I don't know what is normal but I can give you my readings.

Warm up 10.5 then quickly to the 11's.
warmed up at 900 rpm idle - 13.8
cruising around -14 to 15
boost events drops it down to low 11's.
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Old 05-31-2012, 08:51 PM
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Brando
 
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Mine are at high tens low elevens in second, I don't have time to look in first. Third fourth and fifth full boost always stay between 10-11.5. 14 full boost is too high. Is your gauge digital? A moving needle might be reason for slow actuation I guess. Mine is 915 gearbox.
Old 05-31-2012, 10:48 PM
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10/11... You are as rich as in CIS !! Why ? Do you have tried with an AFR of 12/12.5 ? What was the problem ? EGT too hot ? Knock ?...

My values, with 3.4, EFI, GT2 cams, big turbo and 0.9bar boost :

Idle : 13.5
Cruise : 12.5/13
Boost : 12/12.3
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Old 06-01-2012, 12:38 AM
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Brando
 
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Cruise for me is 14-15
Old 06-01-2012, 06:11 AM
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Mine cruises nicely at 15 - 15.5ish. Idle 13.5, mid 11s on boost
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Old 06-01-2012, 07:29 AM
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Mine cruises nicely at 15 - 15.5ish. Idle 13.5, mid 11s on boost

Richard930, With the A/F ratio your running what do you see for gas miliage?

The required picture. Just picked it up 3 months ago and have added Brians adj WUR and it runs much better. Thanks Brian!

Don
Old 06-01-2012, 03:43 PM
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Nice car! I haven't done any highway trip for quite a while but figure I would probably be in the 11 l/100km range which is about 20 - 21 mpg. My normal driving, which is mostly city commuting with occasional highway and full boost runs only gets me about 12 mpg.
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1982 930, K27-7200, Ruf wheels, Leask WUR, Tial WG, RarlyL8 headers & single out muffler, SC cams, TK I/C
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Old 06-02-2012, 12:06 PM
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Frank,
It's possible that's the case, but I don't experience that with mine.

Your comment at the end regarding the Motec maps, can you explain what you mean by that?

Quote:
Originally Posted by forte500 View Post
Put in AFR gauge this past weekend......pointer stays perfectly in range 10.5 - 11.5 in 3r - 5th gear (G50)....1st in 2nd reads 14+ on full boost. I suspect it's because the readings don't have time to normalize in lower gears but wanted to see if anyone else observed this??


Motec maps show everything is normal...
Old 06-02-2012, 01:21 PM
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That is severely lean for boost being in the 14's. My Innovate is said to sample 1000 X's a second so there shouldn't be any lag in the readings. Of course the digital display samples less than that but it still should be nearly instant feedback and accurate.


Last edited by Tippy; 06-02-2012 at 03:01 PM..
Old 06-02-2012, 02:59 PM
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