I recently rebuilt my 1984 318i M10 engine with the following upgrades:
Early block
92mm pistons
2.0 crank
Metric Mechanic "sport" head
Ireland Engr 292 camshaft
Ireland Engr Shorty ceramic header stainless downtube
2 1/4" exhaust, performance muffler
Stock new injectors
New 02 sensor
I now have 500 miles on the engine and just did the first oil change, engine runs fantastic, idles really well at 1000rpm and just passed smog here in Socal - whew.
My A/F ratio and Performance question is this.
I left the stock intake, AFM, Air filter and fuel injection system in place and have been concerned about running too lean. I installed an innovate wideband (new bung) over the weekend and was surprised to see that I am running at 14.7 at idle and part throttle and at 13 (roughly, varies from 12.5 to 13.5) at WOT.
With the new feedback from the wideband, it seems as if I have everything right where it needs to be and am happy with the current performance. Because I believed that I had to be running lean, I was planning on an M20 throttle body (and adapter, jeep TPS) and a microsquirt system. And the question: Am I leaving any additional performance on the table by not going M20/microsquirt? I seriously thought the current setup would've been too lean and put the engine at risk.
Thanks in advance for feedback.
Bob
Early block
92mm pistons
2.0 crank
Metric Mechanic "sport" head
Ireland Engr 292 camshaft
Ireland Engr Shorty ceramic header stainless downtube
2 1/4" exhaust, performance muffler
Stock new injectors
New 02 sensor
I now have 500 miles on the engine and just did the first oil change, engine runs fantastic, idles really well at 1000rpm and just passed smog here in Socal - whew.
My A/F ratio and Performance question is this.
I left the stock intake, AFM, Air filter and fuel injection system in place and have been concerned about running too lean. I installed an innovate wideband (new bung) over the weekend and was surprised to see that I am running at 14.7 at idle and part throttle and at 13 (roughly, varies from 12.5 to 13.5) at WOT.
With the new feedback from the wideband, it seems as if I have everything right where it needs to be and am happy with the current performance. Because I believed that I had to be running lean, I was planning on an M20 throttle body (and adapter, jeep TPS) and a microsquirt system. And the question: Am I leaving any additional performance on the table by not going M20/microsquirt? I seriously thought the current setup would've been too lean and put the engine at risk.
Thanks in advance for feedback.
Bob
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