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Author Subject: Air fuel ratio
hovis16

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Post #1
quick things guys will this affect bhp much if the mixture isn't right? but show no signs of hunting stalling or lack of torque. only reason i ask is because my afr looks awful and also my power readings on the dyno seem to be miles off for a rebuilt engine. At this moment i'am changing the fuel rail over to see if if makes a difference

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Posted 4th Jun 2012 at 21:40
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hovis16

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Post #2
but i have an ok curve going

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Posted 4th Jun 2012 at 21:44
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fatlapit

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Post #3
running a bit rich mate but not alot 12.0 is around perfect mate tbh

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Posted 4th Jun 2012 at 21:53
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hovis16

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Post #4
so it burning a tad more fuel. how should the afr look then? even all the way or a tad peaky can member what standard bhp at the wheels are

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Posted 4th Jun 2012 at 22:01
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playboyb

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Post #5
I'll grab my printout in abit which is apparently perfect afr according to corten miller

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Posted 4th Jun 2012 at 22:15
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playboyb

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Post #6


Found it

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Posted 4th Jun 2012 at 22:18
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buzzbrightyear

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Post #7
What would changing the rail do though?

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Posted 4th Jun 2012 at 22:18
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hovis16

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Post #8
fuel blockage ect.....seems my injector seals are fubar. so ive just changed my injectors over

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Posted 4th Jun 2012 at 22:26
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hovis16

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Post #9
playboyb wrote:


Found it

that looks better hmmmmmm 4th gear too

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Posted 4th Jun 2012 at 22:29
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playboyb

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Post #10
Don't know what it means just been told its a good afr lol

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Posted 4th Jun 2012 at 22:32
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stan_306gti6 Forum Admin

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Post #11
Yes, that's a nice steady increase on the AFR Sam. Yes

The car should ideally be run in 4th gear, not sure why they used 3rd on yours Hovis. Dunno

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Posted 4th Jun 2012 at 22:43
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hovis16

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Post #12
stan_306gti6 wrote:
Yes, that's a nice steady increase on the AFR Sam. Yes

The car should ideally be run in 4th gear, not sure why they used 3rd on yours Hovis. Dunno


hmm so should i ignor the figures and sort my fuel issue out stan? just about to take her for a quick spin to see if changing the rail and injectors make a difference. also while your here what do the br,rh,at and etc mean at the bottom of the graph?

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Posted 4th Jun 2012 at 22:50
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fatlapit

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Post #13
my turbo stayed between 11.8 and 12.3 whilst accelerating from idle so should be flatish tbh

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Posted 4th Jun 2012 at 23:15
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stan_306gti6 Forum Admin

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Post #14
I have an AFR gauge in the car, and whilst accelerating I'll see anything from 13.2 down to 12.7 depending on how hard the acceleration is.

I am not sure what the other abreviations mean at the bottom of the graph, but your fuelling doesn't look too bad to me.

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Posted 5th Jun 2012 at 08:04
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welshpug!

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Post #15
why didnt they take it to the limiter?! theres another 800 rpm there at least!

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Posted 5th Jun 2012 at 16:33
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welshpug!

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Post #16
fatlapit wrote:
running a bit rich mate but not alot 12.0 is around perfect mate tbh


13-14 is leaner not richer.

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Posted 5th Jun 2012 at 16:55
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hovis16

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Post #17
welshpug! wrote:
why didnt they take it to the limiter?! theres another 800 rpm there at least!

i told him that. but because i have xsi lockwood dials the redline is lower

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Posted 5th Jun 2012 at 17:16
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welshpug!

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Post #18
so this thread is worthless till you go and get a proper run done LOL

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Posted 5th Jun 2012 at 17:41
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stan_306gti6 Forum Admin

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Post #19
welshpug! wrote:
so this thread is worthless till you go and get a proper run done LOL


LOL

Pretty much, yeah.

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Posted 5th Jun 2012 at 17:44
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hovis16

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Post #20
800rpm wont make up 10-12bhp tho? would it

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Posted 5th Jun 2012 at 19:00
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fatlapit

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Post #21
No because peak power is at 6500

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Posted 5th Jun 2012 at 19:02
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welshpug!

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Post #22
but with the wrong cluster in you havent a clue what its revving to....

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Posted 5th Jun 2012 at 19:26
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fatlapit

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Post #23
welshpug! wrote:
fatlapit wrote:
running a bit rich mate but not alot 12.0 is around perfect mate tbh


13-14 is leaner not richer.


oops my bad always get it the wrong way around. try a better induction system or a injector clean by asnu

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Posted 5th Jun 2012 at 21:23
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yanni

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Post #24
Allow me to cut in but what's the ideal reading on the AFR on a standard engine?
On tick-over at 2500 rpm and at 5000 rpm? I am stupid i know but i never understood what's the correct values.

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Posted 5th Jun 2012 at 23:03
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fatlapit

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Post #25
As close to 12 as u can on any engine tbh mate its called "stoicg". its the perfect air fuel mixture to burn in the cylinders

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Posted 5th Jun 2012 at 23:07
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