2 oxygen sensors with MS-II

For discussing how to choose sensors and create a wiring harness for all Bowling and Grippo versions of the MegaSquirt® EFI controller.
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my0wn3ds
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Posts: 37
Joined: Fri Dec 03, 2010 4:10 am

2 oxygen sensors with MS-II

Post by my0wn3ds »

I have dual custom exhaust, with no H- or X-pipe.
How to use 2 stock oxygen sensors with this external wiring?
http://www.megamanual.com/ms2/v3ext_wiring.gif

(Ford 302, MS-II V3.0, PWM idle)

Also I plan to use AEM wideband separately, without connection to MS-II.
94'Mustang 302 swap/4BBL, 87'Cougar XR-7 289 swap/turbo project
Matt Cramer
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Posts: 2951
Joined: Sat Jul 03, 2004 11:35 am

Re: 2 oxygen sensors with MS-II

Post by Matt Cramer »

Add a duplicate of the main oxygen sensor circuit, connected to an unused pin on the DB37, and bring the output of the circuit in to JS5.
my0wn3ds
Helpful Squirter
Posts: 37
Joined: Fri Dec 03, 2010 4:10 am

Re: 2 oxygen sensors with MS-II

Post by my0wn3ds »

Matt Cramer wrote:Add a duplicate of the main oxygen sensor circuit, connected to an unused pin on the DB37, and bring the output of the circuit in to JS5.
Thank you.

I've found part of manual about 2 EGO
http://www.megamanual.com/v22manual/mwire.htm#ego

By the way I have another question connected with "2 EGOs question".

What means "engine bank" for V8 engine in MS manual?
Is it 1-2-3-4 (bank1) and 5-6-7-8 (bank2) cylinders?
Or bank is the number of cylinders depends of firing order?

For example we have 302 with firing order 1-5-4-2-6-3-7-8
What's the right banks definition?
1-2-3-4 and 5-6-7-8
or
1-5-4-2 and 6-3-7-8?
94'Mustang 302 swap/4BBL, 87'Cougar XR-7 289 swap/turbo project
Matt Cramer
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Posts: 2951
Joined: Sat Jul 03, 2004 11:35 am

Re: 2 oxygen sensors with MS-II

Post by Matt Cramer »

When using two EGO sensors, the bank is determined by what exhaust ports feed what O2 sensor. With manifolds or normal headers, one side of the engine would be one bank, and the other side would be another. If you're using an exotic set of headers where some of the header tubes from one side of the engine cross over to the other, you pair the banks by header tube. Put all the cylinders that go into one collector on the same bank.
my0wn3ds
Helpful Squirter
Posts: 37
Joined: Fri Dec 03, 2010 4:10 am

Re: 2 oxygen sensors with MS-II

Post by my0wn3ds »

Matt Cramer

Thank you very much again.
94'Mustang 302 swap/4BBL, 87'Cougar XR-7 289 swap/turbo project
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