Running Miata with (only) intake manifold mounted injectors
#1
Running Miata with (only) intake manifold mounted injectors
Why in the world would I want to do this?
Let's just say I don't like swapping injectors to pass emissions and I already have a modified intake manifold with 1 injector per runner which supports my Link Piggyback.
My thought is to install high capacity injectors driven by my soon to arrive MS3 in the normal location and put the stock Miata injectors into the now unused secondary slots in my intake. When inspection time rolls around I'll just swap the Stock ECU in and let it drive the stock injectors. (I plan to add a 2nd wiring harness for the 2nd set of injectors.
They will be farther up stream from the stock location, but can't see much of an issue.
My question: Does anyone have experience with how a Miata would run on the Stock ECU, driving stock injectors mounted in the intake manifold (where FM's Link piggyback had secondary injectors)?
Maybe someone has experience with this based on building their own manifold?
Let's just say I don't like swapping injectors to pass emissions and I already have a modified intake manifold with 1 injector per runner which supports my Link Piggyback.
My thought is to install high capacity injectors driven by my soon to arrive MS3 in the normal location and put the stock Miata injectors into the now unused secondary slots in my intake. When inspection time rolls around I'll just swap the Stock ECU in and let it drive the stock injectors. (I plan to add a 2nd wiring harness for the 2nd set of injectors.
They will be farther up stream from the stock location, but can't see much of an issue.
My question: Does anyone have experience with how a Miata would run on the Stock ECU, driving stock injectors mounted in the intake manifold (where FM's Link piggyback had secondary injectors)?
Maybe someone has experience with this based on building their own manifold?
#2
Hey Rick, where ya from buddy? (Hint, put yer damn location in)
You need to also install a guage to see what your afr's will be for the switch. My guess is it won't be a big deal cause you can tune from the MS3. Ideally, you would want injectors that have a narrower spray pattern. In for the test.
-JB
You need to also install a guage to see what your afr's will be for the switch. My guess is it won't be a big deal cause you can tune from the MS3. Ideally, you would want injectors that have a narrower spray pattern. In for the test.
-JB
#6
Thanks Leafy. Yes, the reason for this question is a very difficult to remove upper intake manifold with my current fan / charge pipe / BOV setup. The two front bolts require removing the charge pipe, BOV, both fans and possibly loosening the radiator. It's a tight fit.
So, the question stands, any experience out there?
Worst case I'll just give it a try. I have a wide band O2 sensor installed so my biggest risk is poor air/fuel mix in the manifold causing a lean condition in just one cylindar that I can't detect on the wide band O2. Running without boost I'd guess this is a pretty small risk.
So, the question stands, any experience out there?
Worst case I'll just give it a try. I have a wide band O2 sensor installed so my biggest risk is poor air/fuel mix in the manifold causing a lean condition in just one cylindar that I can't detect on the wide band O2. Running without boost I'd guess this is a pretty small risk.
#11
I was thinking of the wrong pair of bolts. Yes I see how this could work without taking the charge pipe out, etc. Hopefully it's as (relatively) easy as it sounds.
For what it's worth, I'll probably still test running the stock injectors in the intake manifold to close out the question. Might be interesting.
Thanks for the input.
For what it's worth, I'll probably still test running the stock injectors in the intake manifold to close out the question. Might be interesting.
Thanks for the input.
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