Sharktuning experience
02-09-2019, 06:10 AM
#61
Pro
Thread Starter
Well I have finally hit a limit with advance, recorded some big X knocks high up under load and a couple of random smaller knocks lower down in the rev range.
Also I noticed the last lot of advance didn’t seem to translate into any extra performance.
I am also bringing in the level of richness at high load high revs as it was running to rich, it was way down at 12 AFR.
I am doing all the adjustments in excel now which referring back to the SP overview of the runs.
Also I noticed the last lot of advance didn’t seem to translate into any extra performance.
I am also bringing in the level of richness at high load high revs as it was running to rich, it was way down at 12 AFR.
I am doing all the adjustments in excel now which referring back to the SP overview of the runs.
02-09-2019, 07:35 AM
#62
Rennlist Member
It would be interesting to know just how much advance one can add when the air temps are around zero C. I tend to tune my motor at night in the summer time to be safe - the air temps are a bit more reasonable by then down to around 35C.
For what it is worth I was advised that the 928 head design produces max power at 13 to 1. Stock tunes deliver AFR's in the low 12's and one presumes that is to give a margin of safety.
For what it is worth I was advised that the 928 head design produces max power at 13 to 1. Stock tunes deliver AFR's in the low 12's and one presumes that is to give a margin of safety.
02-12-2019, 04:04 PM
#63
Pro
Thread Starter
It would be interesting to know just how much advance one can add when the air temps are around zero C. I tend to tune my motor at night in the summer time to be safe - the air temps are a bit more reasonable by then down to around 35C.
For what it is worth I was advised that the 928 head design produces max power at 13 to 1. Stock tunes deliver AFR's in the low 12's and one presumes that is to give a margin of safety.
For what it is worth I was advised that the 928 head design produces max power at 13 to 1. Stock tunes deliver AFR's in the low 12's and one presumes that is to give a margin of safety.
I am going to be targeting that 13:1 ratio high up in the rev range. It is pretty close elsewhere in the rev range but the last 2 or 3 maximum load levels in the fuel map just dumped fuel in at silly rate. I am hoping to test tomorrow night and see what is happening.
02-14-2019, 06:26 AM
#64
Drifting
Latest ignition
Marti, heres my current map - it goes well
My rpm points are no longer standard to pull back timing where I was seeing some knock. Like everything its still a work in progress.
02-14-2019, 03:02 PM
#65
Pro
Thread Starter
Hi
Funny, our maps are not to far out from each other. Pictured above is my current map, the orange box is where I got some recent knock and pulled the timing back slightly. I actually found I could run 10 degrees more than the 25 degrees I am currently running by dumping in fuel but this was not translating to any extra go, rather the opposite.
So now I am optimising fuelling and tweeking timing. I think I am reaching the end of the road with tuning for this set up.
I am hoping that the next time I have to ST when I change the manifold will be a lot faster because of what I have learnt so far.