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AFR Gauge ideal application question

Wondering which AFR gage to use. I would prefer to have one with portability as I have a number of cars that need fine tuning. I was thinking, as opposed to installing one in each car, getting one and install a sensor bung in all and just running the connections to a unmounted read out gage, or are there any that has that capability with a clip on exhaust probe that does not cost a fortune. I noticed some for sale that advise use with unleaded fuel only. I am concerned with AFR at high boost with 100=+ octane leaded fuel. On some of my modified ones the builder has installed a exhaust temp ( old school ) and does indicate how it is burning however I would think the AFR should be more accurate for road tuning. Other Ideas, options or equipment for sale to meet these needs appreciated.
Old 07-02-2008, 08:03 AM
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It is the sensors that don't like the lead in fuel. It shortens the life of the sensor. But, if they are not a permanent install (probe in tailpipe) then you should be fine. Double check that the lead does not alter the readings but AFAIK it doesn't, it will over time though and you will need to recalibrate the sensor more often.
The disadvantage of the probe in tailpipe is inaccurate reading at idle due to inadequate gas flow as the fresh air outside the tailpipe can get to the sensor. This is the same reason you don't mount a permanent sensor too near the tailpipe.
Sounds like you should get an Innovate LM-1, it has a proper recalibration sequence.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
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Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

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Last edited by NathanUK; 07-02-2008 at 11:26 AM..
Old 07-02-2008, 11:23 AM
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Not to worried about low speed / idle readouts just melted innards and highest performance AFR for each turbo Porsche being set up for optimum performance. Is there a manufacturer that makes one that is affordable and can be quickly and temporarily installed from car to car? Thanks for the info about unleaded fuel disclaimer usage on some AFR gauge ads. Sounds like most would work OK as they would only be used for set up and that it would take some time to foul the sensor. What manufacturers would fit my needs/ budget best?
Old 07-02-2008, 01:02 PM
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I use an lm-1. I noticed a .5 a/f difference between reading at the tailpipe with their tail pipe mount vs. reading at the header collector with the bung.
If you get the lm-1 (or 2) get the rpm controller.
Old 07-02-2008, 01:04 PM
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FYI: Any WBO2 sensor will be killed by leaded fuel quite soon. The more lead the shorter lifetime. They are not made to run with leaded fuel.
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Old 07-02-2008, 02:47 PM
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LM-2's are now shipping,, included the equivalent of the rpm kit AND a ODBII reader in it.. Mine shipped yesterday!!
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Old 07-02-2008, 07:21 PM
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Install an LM, and remove the O2 sensor and reinstall it only for occasional use -
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Old 07-02-2008, 08:24 PM
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Yep, go for LM like I stated.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 07-03-2008, 09:21 AM
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