Spark Knock Under Light Acceleration
05-09-2016, 05:32 AM
#1
Spark Knock Under Light Acceleration My motor is running really well with a few minor issues. Spec is in my sig
I'm using Megasquirt 3X for sequential spark and fuel - essentially the same as the MS3Pro.
On a long drive yesterday I noticed I'm getting a bit of knock under light acceleration around 2000rpm. I rechecked my base timing and made a minor adjustment (retarded 2 deg).
I'm still getting a bit though. My spark table is below.
Cruising info:
30mph is 45KPa @30deg advance 1800rpm
50mph is 53KPa @30deg advance 1900rpm
60mph is 52KPa @32deg advance 2250rpm
Light acceleration is about 70kpa and 24/25deg in all cases.
I've seen previously posted spark tables but they have all been MAF based rather than speed density.
I'm running around 11:1 compression with standard UK 95RON pump gas (equivalent to 91 Premium in the USA). Perhaps I should consider running on Super 99RON (93 equivalent in the USA)?
I'm going to do some more tuning later today, but any input would be welcomed.
Sera
I'm using Megasquirt 3X for sequential spark and fuel - essentially the same as the MS3Pro.
On a long drive yesterday I noticed I'm getting a bit of knock under light acceleration around 2000rpm. I rechecked my base timing and made a minor adjustment (retarded 2 deg).
I'm still getting a bit though. My spark table is below.
Cruising info:
30mph is 45KPa @30deg advance 1800rpm
50mph is 53KPa @30deg advance 1900rpm
60mph is 52KPa @32deg advance 2250rpm
Light acceleration is about 70kpa and 24/25deg in all cases.
I've seen previously posted spark tables but they have all been MAF based rather than speed density.
I'm running around 11:1 compression with standard UK 95RON pump gas (equivalent to 91 Premium in the USA). Perhaps I should consider running on Super 99RON (93 equivalent in the USA)?
I'm going to do some more tuning later today, but any input would be welcomed.
Sera
Last edited by gothic_sera; 05-09-2016 at 06:18 AM.
