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-   -   A Question for Those with EFI Engines (http://www.clubcobra.com/forums/all-cobra-talk/112843-question-those-efi-engines.html)

Zaphod B 10-07-2011 12:41 PM
A Question for Those with EFI Engines
 
I'm considering running fuel injection when I order my engine.

Where are you EFI guys putting the O2 sensor? Normally you'd want to put it after the collector, but the collectors on the side pipes are outside the car....:confused:

DucatiThunder 10-07-2011 01:16 PM
Mine is under the passenger sidepipe. Its underneath just aft of the 4 pipes into one. Cant see it from under or above ... fairly unnoticeable.

Zaphod B 10-07-2011 01:34 PM
Quote:
Originally Posted by DucatiThunder (Post 1155262)
Mine is under the passenger sidepipe. Its underneath just aft of the 4 pipes into one. Cant see it from under or above ... fairly unnoticeable.
Does that work well for you, sampling from just one pipe?

FUNFER2 10-07-2011 03:38 PM
You want to read both side of the motor with side pipes, not just one bank. If you had dual exhaust with a Y or X pipe exiting to one or two tail pipes, then that's fine. Believe me, we've tested systems on the chassis dyno.

DonC 10-07-2011 04:00 PM
In general it will depend on what type of 02 sensor you're using. Narrow band sensors don't have heaters so they need to be closer to the exhaust port to maintain the temp needed to be accurate. A wide band 02 sensor can be located farther away (as in the collector) since it has it's own heater element.
It's also preferred to mount them somewhere between straight vertical and 90 degree to prevent condensation for collecting on the elements and fouling them.
I'm using a Mass-Flo system with narrow band sensors and mine are located in one of the primaries on either side of the engine. Not an ideal solution but close enough to keep them hot and give me a reasonably usable reading.
DonC

DucatiThunder 10-07-2011 10:25 PM
Quote:
Originally Posted by Zaphod B (Post 1155269)
Does that work well for you, sampling from just one pipe?
Yea, I havent had any problems. Im running Fast EFI with my Inglese 8 stack. Not sure how you would run it any other way with the cobra set up.

Avmaviator 10-08-2011 07:36 AM
Our FAST EFI system will be mounted in the collector, outside the car, as it was recommended by FAST and my engine builder. On the dyno it ran great. And we saw the same AF numbers on the two different banks. The dyno had an O2 sensor on the other side, also in the collector, to compare readings between the EFI sensor and the dyno sensor (and also left and right like I mentioned).

Unless something is going wrong on one side due to a mechanical issue or something, you should be getting correct information for tuning the whole engine by using only one side.

vector1 10-08-2011 08:25 AM
one bank or the other i don't think matters except you do not want any air leaks at the flanges or collector to primary connection. i have a sensor in a primary pipe but not running efi and i would think the pulses or variances would need to be averaged or the sample rate reduced.

lamaluv 10-08-2011 11:31 AM
My O2 sensor is located where the collector and side pipes meet. I am running a FAST EZ system and have not had any O2 sensing problems in the 5 years I have had it on the car.

http://www.clubcobra.com/photopost/d...-26-07-033.jpg
http://www.clubcobra.com/photopost/d...s/P1000964.jpg

Zaphod B 10-10-2011 10:10 AM
Thanks, guys.

Zaphod B 10-10-2011 10:28 AM
Quote:
Originally Posted by lamaluv (Post 1155349)
My O2 sensor is located where the collector and side pipes meet. I am running a FAST EZ system and have not had any O2 sensing problems in the 5 years I have had it on the car.
lamaluv, if I'm seeing the picture correctly, you have the sensor angled downwards, which is contrary to the recommendation to have it angled upwards (in order to avoid condensation getting on the sensor). Yet you've had no issues in 5 years. Cool.

lamaluv 10-10-2011 11:08 AM
The picture of the sensor on the car is deceptive as the wiring from the sensor hangs down making it look like it is angled down. It is actually tipped up which is shown better in this picture. The hole is just above center on the collector pipe.

http://www.clubcobra.com/photopost/d...-26-07-034.jpg

Zaphod B 10-10-2011 12:01 PM
Quote:
Originally Posted by lamaluv (Post 1155626)
The picture of the sensor on the car is deceptive as the wiring from the sensor hangs down making it look like it is angled down. It is actually tipped up which is shown better in this picture. The hole is just above center on the collector pipe.
OK, I see. Thanks much.


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