Fun with troubleshooting leanness (and 5th gear cruising temps) |
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Fun with troubleshooting leanness (and 5th gear cruising temps) |
emerygt350 |
Mar 15 2024, 03:37 PM
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#1
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Advanced Member Group: Members Posts: 2,144 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
So I have been playing with adding resistance to the cht to bump my mixture. Messing with the mps was not getting me to where I wanted to be I wanted something a little more global. Anyway, bought a 10 dollar Bluetooth relay. Set it up so one channel was clean the other had 50ohms resistance in it. As I am driving I can switch back and forth and watch the results on the cht and AFR. 50 is really working well (this is all in addition to my 250ohm found on 73s). Now I have added another 20 ohms to the alternate so the relay will switch between 50 and 70. It ain't pretty but it's only for troubleshooting.
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brant |
Apr 3 2024, 10:09 AM
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#2
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914 Wizard Group: Members Posts: 11,639 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
12-1 at cruising is too much fuel
Washed the oil film more Increases wear on the motor WOT should be 12.5:1 to flood the cylinder under that condition as the charge actually cools the head more for load when it’s needed But not at steady state cruising And why a pot that changes across the whole range can be detrimental compared to the factory tune that can adjust for conditions and throttle conditions |
emerygt350 |
Apr 3 2024, 12:48 PM
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#3
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Advanced Member Group: Members Posts: 2,144 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
12-1 at cruising is too much fuel Washed the oil film more Increases wear on the motor WOT should be 12.5:1 to flood the cylinder under that condition as the charge actually cools the head more for load when it’s needed But not at steady state cruising And why a pot that changes across the whole range can be detrimental compared to the factory tune that can adjust for conditions and throttle conditions Yeah, 12 is definitely not good at cruise, I was shooting for 13.5. With nothing but MPS mods, it sits at 13.8-9 now at 3200 rpm 72 mph, 12-13inhg. I haven't been able to test my fat switch due to the craptastic weather we are having but from my previous experiments I suspect it will bring me to 13ish. What I am hoping for now is a 'oh jeeze, thats a long climb' switch for the interstate. Out here in upstate ny you can end up climbing 1500 feet over 75 miles with no break as you head west from Elmira. I don't want to be in a position where I am hitting 400 and can't do anything but slow down. No idea if this will actually help that, but it is harmless to try. |
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