Air fuel ratio readings on boost and rollers from SC?
17 July 2006, 02:23 PM
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Air fuel ratio readings on boost and rollers from SC?
Hi all,
Anyone out there have Scoobyclinic roller graphs with Air/Fuel rations? I was wondering what your AFR's figures are on boost? 12:1, 11:1? I've got some graphs and want to confirm if my readings are lean/rich, ie how they compare to other's maps.
Anyone out there have Scoobyclinic roller graphs with Air/Fuel rations? I was wondering what your AFR's figures are on boost? 12:1, 11:1? I've got some graphs and want to confirm if my readings are lean/rich, ie how they compare to other's maps.
17 July 2006, 03:28 PM
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Hello chap...Dont really want to do that as it might start fingers wagging 
etc, just want to know if my roller results are a match for others that have had remaps there, ie AFR's print out results accurate for other's maps?
I'm not happy with the car after using it for a couple of weeks. I've had things like cut outs at idle, ruff running in traffic queues, misfire errors almost all the time. The car goes very well, but doesn't sound sweet and the EGT temps are crazy.
I'm not rushing into anything now until l I know exactly what I'm talking about.
etc, just want to know if my roller results are a match for others that have had remaps there, ie AFR's print out results accurate for other's maps?I'm not happy with the car after using it for a couple of weeks. I've had things like cut outs at idle, ruff running in traffic queues, misfire errors almost all the time. The car goes very well, but doesn't sound sweet and the EGT temps are crazy.
I'm not rushing into anything now until l I know exactly what I'm talking about.
17 July 2006, 03:34 PM
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its not the results that anyone concerned about.....just the AFR graph will tell you if its rich/lean straight off...
SC's is a dyno dynamics RR if i remember rightly so if you look at the AFR graph, the line should level off ar around 0.75 to the redline....
SC's is a dyno dynamics RR if i remember rightly so if you look at the AFR graph, the line should level off ar around 0.75 to the redline....
17 July 2006, 03:54 PM
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I'm not wanting to hide the power figures...I dont want the AFR results on scoobynet if my gutt feeling about the AFR results is right.
I've had it confirmed my AFR readings are .83
and not .75 
and below on boost, which is lean, but I'm not sure how to read this on the graph - sorry, bit of a pleb, as the readings are in 14:1, 13:1 scale. Is .75 = 11:1? I understand what this ratio is, ie max efficiency is at just over 14:1 for fuel economy but max power is much richer, 12:1 or 11:1 on turbo cars.
I just want to understand the scale...
I've had it confirmed my AFR readings are .83
and not .75 and below on boost, which is lean, but I'm not sure how to read this on the graph - sorry, bit of a pleb, as the readings are in 14:1, 13:1 scale. Is .75 = 11:1? I understand what this ratio is, ie max efficiency is at just over 14:1 for fuel economy but max power is much richer, 12:1 or 11:1 on turbo cars.I just want to understand the scale...
17 July 2006, 04:13 PM
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i have no idea bout the ratio scale your talking about....ill keep it decimal for this 
but 0.83 is a bit on the lean side for my liking...
but 0.83 is a bit on the lean side for my liking...
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but prefer not to say until I've sorted everything and car running as it should be
17 July 2006, 04:48 PM
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any good to you,
I know what it feel like to not be happy with a car after you have spent a load of hard earned ( slaps hand, this was not scooby clinic
)I ended up getting Bob to fix rather than shouting about it on here so know where you are comming from
edited to say - im still on the OE wrx pistons so i bet Bob has kept it more wet than what he could do with good internals, ignore the bellow 4k figures
Last edited by WRX_Rich; 17 July 2006 at 06:53 PM.
17 July 2006, 04:50 PM
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Rich, just a quick thing, i had a look at your 386 graphs....i noticed that your torque was only 315~ what turbo was this using?
Cheers
Cheers
17 July 2006, 04:53 PM
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its a rcm gt35 \ p18
the lower (gear box saving ) torque has probably more to do with Bobs mapping and making the car last than the turbo
car made simular ft lbs last time with a p18\ vf35 - the car feels a totaly differnt animal
the lower (gear box saving ) torque has probably more to do with Bobs mapping and making the car last than the turbo
car made simular ft lbs last time with a p18\ vf35 - the car feels a totaly differnt animal
Last edited by WRX_Rich; 17 July 2006 at 04:56 PM.
17 July 2006, 05:12 PM
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Rich, perfect m8, just what I needed. Confirms my roller graph shows running way leaner than yours...will check again tonight but I'm sure its not at the 11:1 level.I think I'm now in the same boat as you were...Bob's going to be the king and sort my motor - and get the power figures I'm sure she's able to produce without aftermarket ecu and electronic boost controller
17 July 2006, 05:29 PM
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Originally Posted by WRX_Rich
We at the clinic have not mapped this vehicle either before the 5 runs or after as the post implies.
Cheers
Kev.
17 July 2006, 05:41 PM
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Kev if you are talking about it running too rich at low boost
it dosn't do this on the road (using my psi3 ) or when Bob was mapping
the guy pointed out this when I had the car on the rollers and was extreamly helpfull in trying to find the fault - I could not reproduce on the road
http://bbs.scoobynet.co.uk/showthrea...=490419&page=5
it dosn't do this on the road (using my psi3 ) or when Bob was mapping
the guy pointed out this when I had the car on the rollers and was extreamly helpfull in trying to find the fault - I could not reproduce on the road
http://bbs.scoobynet.co.uk/showthrea...=490419&page=5
Last edited by WRX_Rich; 17 July 2006 at 05:49 PM.
17 July 2006, 06:15 PM
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sorry,
my mistake but reading the thread again I thought we were talking about using scoobyclinic rollers and not mapper, didn't even knew you mapped cars but always been happy with the service and rollers when I ve been down
my mistake but reading the thread again I thought we were talking about using scoobyclinic rollers and not mapper, didn't even knew you mapped cars but always been happy with the service and rollers when I ve been down
17 July 2006, 06:22 PM
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Hi,
thanks Rich,
some one E mailed me this thread asking if we had sent out the car with a printout like that, so I had to respond to clear the matter up.
Thanks again
Kev
thanks Rich,
some one E mailed me this thread asking if we had sent out the car with a printout like that, so I had to respond to clear the matter up.
Thanks again
Kev
18 July 2006, 10:08 AM
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AFR of 12.2 at 1.5 bar of boost is lean if you're talking about pump fuel. But you also mentioned elsewhere that you have WI? Is (was) it injecting methanol, or water? It also doesn't take into account the timing you are running.
I used to aim for no lower than 11.6 dropping off to 11-ish at the redline on Subaru customer cars (unless the customer was very insistent).....but then I'm a bit conservative 
Richard
I used to aim for no lower than 11.6 dropping off to 11-ish at the redline on Subaru customer cars (unless the customer was very insistent
).....but then I'm a bit conservative Richard
18 July 2006, 11:04 AM
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Hi Rich,
Yes, shell 98 fuel...water injection with a small % of booster added, so mostly water.
It's the EGT temps of max 918 to 935 deg that started me off with worries re setup - car def lean and will get it resolved once funding available
.
Yes, shell 98 fuel...water injection with a small % of booster added, so mostly water.
It's the EGT temps of max 918 to 935 deg
that started me off with worries re setup - car def lean and will get it resolved once funding available .
18 July 2006, 11:43 AM
#30
If the car is running a MAF Sensor, then depending on the inlet air tract and modifications, ducting, ram air, snorkle deleted etc. and depending on the rolling road fan set up, it is not unusual to see AFRs varying quite noticably from rollers to real world road driving conditions.
12:1 AFR is piston nipping teritory. Best get it checked out with a wide band lambda on the road before you start running on boost.
12:1 AFR is piston nipping teritory. Best get it checked out with a wide band lambda on the road before you start running on boost.