Fuel Economy Issues, Help me find the issue?
#42
Hey, My 70 Cutlass was rear ended and totaled. So been a bit preoccupied. Here is a spark map thread with a few maps to take a look at. You might want to take your 85kpa down a couple of degrees now just to be safer. 34-35ish range.
https://www.miataturbo.net/megasquirt-18/spark-map-itt-i-beg-you-post-44713/
Keep in mind that since you are not yet boosted about any map posted will run for ya - with a word of caution, pinging is always possible so proceed with the usual caution. Any will get you around the block safely for sure. CRAIGO's on page four.
tuning tidbit. one of the reasons I had you set the "bubble" to one number was to have stable timing in that area. Chasing timing can suk. Timing does affect fuel needs.
https://www.miataturbo.net/megasquirt-18/spark-map-itt-i-beg-you-post-44713/
Keep in mind that since you are not yet boosted about any map posted will run for ya - with a word of caution, pinging is always possible so proceed with the usual caution. Any will get you around the block safely for sure. CRAIGO's on page four.
tuning tidbit. one of the reasons I had you set the "bubble" to one number was to have stable timing in that area. Chasing timing can suk. Timing does affect fuel needs.
#43
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Thanks Tim! I have to head to work right now, but I'll check it out when I get home. Sorry to hear about the cutlass, I hope that everything works out the best that it possibly can for ya!
Also, thanks for the tidbit, I had kinda figured that would be an issue when changing timing. It really didnt change as much as I was expecting it to.
Also, thanks for the tidbit, I had kinda figured that would be an issue when changing timing. It really didnt change as much as I was expecting it to.
#44
She was a beauty. 3 years of work gone in 1/2 a second. My little boy cried...
Timing has a lot of room when running light load and does not show fuel changes as much. Remember to think in percentages to recognize how much you really changed fuel. Once you get the feel for it, bump that bubble area around a couple degrees to see your results. Generally move the whole bubble. You will find throttle/rpm areas that like to run and note those as you tweak. I will get blasted for this but the motor could run between 40-50 advance on low power settings for efficiency. But there is compromise needed on the MS. Timing will oscillate (chase) if timing jumps to abruptly.
Timing has a lot of room when running light load and does not show fuel changes as much. Remember to think in percentages to recognize how much you really changed fuel. Once you get the feel for it, bump that bubble area around a couple degrees to see your results. Generally move the whole bubble. You will find throttle/rpm areas that like to run and note those as you tweak. I will get blasted for this but the motor could run between 40-50 advance on low power settings for efficiency. But there is compromise needed on the MS. Timing will oscillate (chase) if timing jumps to abruptly.
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