Hey, everyone! I'm new here, I was hoping I could get some better advice than the Facebook groups, they are useless for actual tuning info!
Anyways I purchased a tune from a tuner that won't be named, and I'm having some issues I need help uncovering.
I am getting consistent timing corrections at a specific rpm and load range. Up to -8° in some cases, this seems to have gone down to -5° since vanos changes.
I will get multiple timing corrections across cylinders at 2500 rpm, at around 40-45 load. The instances occur in sort of a bell curve between 2000-3000 rpm, with the majority at 2500.
I have adjusted timing in the area, not much luck there. I have also played with vanos by reducing overlap in the area which has seemed to help, but not fully correct the issue.
My theory initially was the exhaust gasses from overlap would induce knock in that area specifically. I used the v8 bait spreadsheet to verify overlap.
Hardware:
-new N55 plugs gapped at .018" (I tried stock down to this range with no appreciable change)
-eldor coils (swapping between quiet and loud cylinders makes no difference)
-450 lpfp
-index 12s
-new decouplers and seals.
-17ts
-170-180psi compression across the board
-walnut blasting 2k miles ago
-external high and low pcv
Any ideas?
Anyways I purchased a tune from a tuner that won't be named, and I'm having some issues I need help uncovering.
I am getting consistent timing corrections at a specific rpm and load range. Up to -8° in some cases, this seems to have gone down to -5° since vanos changes.
I will get multiple timing corrections across cylinders at 2500 rpm, at around 40-45 load. The instances occur in sort of a bell curve between 2000-3000 rpm, with the majority at 2500.
I have adjusted timing in the area, not much luck there. I have also played with vanos by reducing overlap in the area which has seemed to help, but not fully correct the issue.
My theory initially was the exhaust gasses from overlap would induce knock in that area specifically. I used the v8 bait spreadsheet to verify overlap.
Hardware:
-new N55 plugs gapped at .018" (I tried stock down to this range with no appreciable change)
-eldor coils (swapping between quiet and loud cylinders makes no difference)
-450 lpfp
-index 12s
-new decouplers and seals.
-17ts
-170-180psi compression across the board
-walnut blasting 2k miles ago
-external high and low pcv
Any ideas?