302 MAF conversion, headers?
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More Turbo
Joined: Jun 2004
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From: Sweden
302 MAF conversion, headers?
I was looking at doing a conversion to MAF on my 302 E150 van. I was also thinking about replacing the exhaust manifolds with some header pipes.
Now the MAF system uses one O2 sensor per side. Some people either wired both O2 sensor wires to the single stock O2 sensor where the pipes join up on the first cat, or use that one and add another on one of the pipes. I think these solutions are misguided since the computer requires this information to be correct- and from the correct location- in order to adjust the mixture.
I noticed the manifolds I have have bung holes for what I assume is O2 sensors? Is that right? Can I put sensors there?
I'd like to install header pipes, lower resistance and aren't prone to cracks. But I don't see any bung holes for sensors on the pics I saw. What, do we just drill out the pipes and install a weld-in bung?
Now the MAF system uses one O2 sensor per side. Some people either wired both O2 sensor wires to the single stock O2 sensor where the pipes join up on the first cat, or use that one and add another on one of the pipes. I think these solutions are misguided since the computer requires this information to be correct- and from the correct location- in order to adjust the mixture.
I noticed the manifolds I have have bung holes for what I assume is O2 sensors? Is that right? Can I put sensors there?
I'd like to install header pipes, lower resistance and aren't prone to cracks. But I don't see any bung holes for sensors on the pics I saw. What, do we just drill out the pipes and install a weld-in bung?
Hotshot
Joined: May 2004
Posts: 12,170
Likes: 5
From: The hills of No. Calif.
You can buy the weld-in bungs, try your local muffler shop. I paid 3 bucks apiece for them as opposed to $12.00 ea. or so from Summit.
They should be installed about three inches downstream from the point where all four pipes on that side come together, so that's pretty close to the header outlet.
Your O2 sensors will be further away from the harness and probably won't reach, so it would be a good opportunity to replace them anyway. The sensors with longer wires (15-16") are:
Standard- SG40
Bosch- 13953
Echlin- OS204
Borg Warner-OS116
Niehoff- FE821
Tomco- 11042
NGK- 22013
Wells- SU235
KEM- 138-130
Of course, this is all for long-tube headers. If you use shorties, the sensor wires should still reach.
They should be installed about three inches downstream from the point where all four pipes on that side come together, so that's pretty close to the header outlet.
Your O2 sensors will be further away from the harness and probably won't reach, so it would be a good opportunity to replace them anyway. The sensors with longer wires (15-16") are:
Standard- SG40
Bosch- 13953
Echlin- OS204
Borg Warner-OS116
Niehoff- FE821
Tomco- 11042
NGK- 22013
Wells- SU235
KEM- 138-130
Of course, this is all for long-tube headers. If you use shorties, the sensor wires should still reach.
Last edited by TigerDan; Feb 17, 2006 at 09:13 AM.
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