barbermi
July 9th, 2014, 07:37 PM
Hi again all.
I'm on the prowl for good information again. I have hired a dyno in 2 weeks time and plan on finishing off my VE and Spark tuning. Im 100% confident doing my VE so that is easy and will be done first. My questions today are based around spark tuning.
I am running an LS1, maggie 1900 supercharger, 224/224/112 cam, dual 3" exhaust, 11.5 PSI boost and AFR's are sweet at 11.5 on boost
I am currently using the stock Holden LS1 high octane table and I would like to know a few things about it.
Firstly why does the spark table have 3 dimensional tendencies until ~ 0.8g/cyl and then timing is only impacted by RPM changes not g/cyl. Please keep in mind im only talking about the spark table at this point. I understand a0010 will pull timing based on MAP but why is this the preferred method of tuning boost?
Secondly after 0.8g/cyl on most stock Holden tunes the timing will increase somewhat to 2800RPM or thereabouts followed by a dip and then increase again until peak RPM. I have looked at HSV tune files and some do not have the dip like a stock commodore tune. Why is this so?
Can anyone suggest a good tune I can use the high octane table from as a starting point for my spark tuning. I understand nothing will be perfect but the closerthe better to save me dyno time.
Thanks for your help.
Mark
I'm on the prowl for good information again. I have hired a dyno in 2 weeks time and plan on finishing off my VE and Spark tuning. Im 100% confident doing my VE so that is easy and will be done first. My questions today are based around spark tuning.
I am running an LS1, maggie 1900 supercharger, 224/224/112 cam, dual 3" exhaust, 11.5 PSI boost and AFR's are sweet at 11.5 on boost
I am currently using the stock Holden LS1 high octane table and I would like to know a few things about it.
Firstly why does the spark table have 3 dimensional tendencies until ~ 0.8g/cyl and then timing is only impacted by RPM changes not g/cyl. Please keep in mind im only talking about the spark table at this point. I understand a0010 will pull timing based on MAP but why is this the preferred method of tuning boost?
Secondly after 0.8g/cyl on most stock Holden tunes the timing will increase somewhat to 2800RPM or thereabouts followed by a dip and then increase again until peak RPM. I have looked at HSV tune files and some do not have the dip like a stock commodore tune. Why is this so?
Can anyone suggest a good tune I can use the high octane table from as a starting point for my spark tuning. I understand nothing will be perfect but the closerthe better to save me dyno time.
Thanks for your help.
Mark