bluejae

i'm wanting to get some accurate afr readings on my car that has headers... i've done a few searches and some are saying that it depends on each motor on where the best place to get the readings from.

either a sniffer type from the exhaust tips, or drilling a hole in the collector, exhaust, header, etc.

the first attempt at getting some afr readings from my car failed by the sniffer... i'm not sure if this was a problem with my car or the sniffer

if drilling a hole somewhere is the best way to go, then where should it be drilled and what parts are necessary?

does it matter whether i have cats or not?

Mort

I have a Innovate LC1 in my truck after the rear mount turbo and it works great. The truck has a SD tune and no cats. Basically it is over the rear axle. So if you have no cats then you can put it further back in the exhaust. If you have cats it should be in front of the cats but may be subject to higher temps and turbulence which can both affect accuracy and life of the sensor. The sensor should be mounted above the center line of the pipe and closer to 12:00 o'clock is best. Drill or blow a hole in the pipe with a torch and weld in a bung. Very easy to do at an exhaust or performance shop. The bungs come with a screw in insert if you want to remove the sensor and plug the bung up after you get some readings.

The LC1 is for permanent installation and the LM1 is for temporary installation and should work from any 12v power outlet in the car. The LM1 does logging as well from internal memory so that you can upload the data to a laptop for viewing.

bluejae

i'm just looking for the best option to get some afr readings without spending too much... i want to put it on a dyno and get the afr readings... and after that, i won't need it again

is it possible to get afr readings from this car with an exhaust probe?

Mort

Any decent dyno shop should be able to get you WOT AFR readings from an exhaust probe. Non WOT readings will not be very accurate unless you have no cats and will read a very consistent 14.7:1 (stoichiometric) when not in the PE tables at WOT.

_AMG_

My AFR's at WOT read around 13.7-14.5 (No secondary cats)

Muskoka_AMG

The sniffer should work... maybe it was just a bad day.

You could borrow someone's wideband a/f guage, and screw the sensor in where your existing o2 sensors are (providing you have a tune that negates those sensors anyways). However, don't go drilling holes in your beautiful headers, just because a shop's sniffer isn't working properly.

bluejae

i didn't even realize that was an option... maybe i can borrow one

c32AMG-DTM

_AMG_

You seem shocked.

c32AMG-DTM

I am. 13.7 - 14.5:1? If accurate, that's very lean for a WOT AFR, IMHO. I'd expect more like 12.5 - 13.0:1 or thereabouts. Is this a pump-gas tune?

_AMG_

This was done on a Dash Dyno that connects into the OBDII port so dunno how accurate that is, numbers kept changing depending on how you are on the throttle.
I was at 12.7 when I dynoed.

Quadcammer

that dash dyno thing is bs.

12.7 is much more like it.

If you ran at 14.5 at WOT, you would have 8 semi-melted paperweights.

bluejae

how permanent are we talking? once installed, can it ever be moved to another car?

Merc63

Just pick up a simple digital wide band monitor with 02 bung. Unplug one of your secondary O2 sensors then screw in the monitor and drive around.

This will only monitor one bank of the engine at a time...

Sniffers aren't as accurate and drilling is unnecessary.

Mort

The LC1 is hardwired in but it can be moved and rewired into another vehicle. The LM1 is very portable and easily moved. The LM1 works with power from most 12v outlets in the car including the lighter socket. The hardest part is finding /making access for the sensor wire into the interior of the car. It also has built in logging functions for AFR. You can use an O2 bung on your car but will get a code eventually or you can weld in a separate bung if you want to use the sensor more extensively.

bhamg

I've been told that a reasonable rule of thumb is to add 0.5 to the AFR reading on the dyno to approximate an on the road AFR. Or that a much too simplistic approach?

Merc63

http://tunertools.com/proddetail.asp?prod=SNP-AF-5000

All you need is something like that. Cruise should be around 14-14.5 and WOT 12.5-13.0.

I just recently tested my AFR out this way. Drove around all day with it.. Don't really need to monitor more then once to insure its correct.

DuaneC63

AFR should be present at the OBD2 port. There are several electronic read outs that you can plug and play to get everything that comes from the OBD2 port

qship5

Jae, I'd be interested in checking mine as well, so maybe we could get a few of the DFW C63 owners to split a measuring system we could all test them as needed/wanted.

bluejae

i just got the ot2 and lc1 combo at a great price...

but since the lc1 is a permanent install, i don't think we can share it... but i'm not sure...

i believe all these are compatible with the ot2 i have... and you're welcome to borrow it.

Compatible with all Innovate MTS (Modular Tuning System) devices, including LC-1 “Lambda Cable” Air/Fuel Ratio sensor controller, LM-2 Air/Fuel Ratio meter with analog inputs, TC-4 4-channel thermocouple interface, and more.

Merc63

Does that hook up with an O2 sensor or through ODB?

bluejae

from what i know.. the ot2 connects to the obd port and the lc1 once installed, it can then be connected to the ot2... then all the info can be seen through wifi on idevices or a computer with the software installed

Merc63

Let us know how good that works.

bluejae

so far the ot2 works fine.

Merc63

So can u get read outs from it? AFR ??

What about timing?