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O2 Clamp Needed? JRSC 1.6l

 
Old 05-11-2017, 09:26 PM
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Default O2 Clamp Needed? JRSC 1.6l

Hi guys, been lurking some and just joined as I have a question I'm hoping you can help me with. I recently purchased a 1992 miata 1.6l with jackson racing supercharger. Fuel control is by an AFPR, no other engine management is present, as far as I can tell. I installed a wide band and the AFR's look pretty good overall. Pulls from a stop result in AFR's in the mid to low 11's, or sometimes upper 10's through every gear if run to redline at WOT. The problem is in roll on. If I open the throttle fast in a roll on, AFR's hang in the mid to upper 13's then settle down to 11's or 12's, after a few seconds. If I roll on the throttle slowly, the AFR's stay in the 11's to redline. This problem is more prevalent in higher gears. Is this something that an o2 clamp/signal modifier will help with? From what I understand, the o2 clamp has the most influence under 4k rpm, but this problem occurs at any rpm in a roll on situation. Any help/advice would be appreciated..
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Old 05-11-2017, 09:44 PM
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Isn't 10-11 too rich under boost?
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Old 05-11-2017, 09:58 PM
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Originally Posted by ridethecliche View Post
Isn't 10-11 too rich under boost?
Meh. It's not hurting anything.

It's the 13s that are the problem.

Stock ecu problems.
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Old 05-22-2017, 10:54 PM
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Ya, I realize a new ecu would be the best way to fix the issue, but I would rather not go down that route right now. Would an o2 clamp help richen the afr on high throttle, low rpm boost?
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Old 05-22-2017, 11:04 PM
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Doesn't sound like something I'd worry about. Then again I value 1.6s around $100.

I usually tune turbo setups around 13:1 at low psi and low rpm. Slamming the throttle and flooding the cylinder right away isn't great. I'd ask for a datalog, but....
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