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michael7810 |
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#1
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Senior Member ![]() ![]() ![]() Group: Members Posts: 1,081 Joined: 6-June 11 From: Scottsdale, AZ Member No.: 13,164 Region Association: Southwest Region ![]() ![]() |
I have to get larger chokes and re-jet my 1911cc/dual IDF40s and was thinking of installing a wideband air-fuel gauge to help with tuning. I've looked at a few digital gauges for around $200 that include the gauge, O2 sensor, bung, wiring, etc. Wondering if you guys have any sourcing recommendations and install tips. It looks simple from what I've read. Thanks for any help you can provide.
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michael7810 |
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#2
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Senior Member ![]() ![]() ![]() Group: Members Posts: 1,081 Joined: 6-June 11 From: Scottsdale, AZ Member No.: 13,164 Region Association: Southwest Region ![]() ![]() |
I found #1 idle jet was plugged so I cleaned that out and readjusted the idle mixtures/sync. AF at 900 rpm idle is 12.5. WOT in 4th gear starts at 11.0 at 2000 rpm (maybe influenced by accel pump), at 3000 its 12.5, 4000 is 12.5-13, 5000 to redline is 13.5-14.0. Steady state 3rd gear I can see the AF jump from 12.5 to 13.5-14.0 when I ease it up from 3000 to 3200 rpm so I think that it when the mains kick in. It runs strong, only issue now is slight hesitation off idle. Next time I'll disconnect the accel pump. Feeling much better now with the way it's running.
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ChrisFoley |
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#3
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I am Tangerine Racing ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 7,937 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None ![]() ![]() |
I found #1 idle jet was plugged so I cleaned that out and readjusted the idle mixtures/sync. AF at 900 rpm idle is 12.5. WOT in 4th gear starts at 11.0 at 2000 rpm (maybe influenced by accel pump), at 3000 its 12.5, 4000 is 12.5-13, 5000 to redline is 13.5-14.0. Steady state 3rd gear I can see the AF jump from 12.5 to 13.5-14.0 when I ease it up from 3000 to 3200 rpm so I think that it when the mains kick in. It runs strong, only issue now is slight hesitation off idle. Next time I'll disconnect the accel pump. Feeling much better now with the way it's running. You can lean out the idle mixture a bit more by opening the air bleed screws just a little further. That won't affect the mixture once the butterflies start to open. At 2000 rpm the main jets are not a major factor. |
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