williamdb13

I have an imported car that was built in Japan and would love some other opinions on this timing map. When I saw the map I was pretty shocked, but I might be wrong and it be a perfectly fine way of tuning timing. Just to preface this, this car wasn’t built recently it is a time capsule and has remained virtually unchanged since the early 2000s up into my ownership. Some hard track time, and the compression test was perfectly fine. It has an old HKS kit on it and was set to ~12psi when I got it, which was the ragged edge of duty cycles. First picture leading, second picture show split taken from Xavier’s FC-Tweak.

My brain says throw the tune out and start over, but it’s hard to ignore the fact this car has lived as well as it has on it.

Note: the PIM column is the same values as standard power fc with factory oem map sensor

rx7srbad

Can you advise the P01-P20 scaling in terms of boost etc? iirc pfc adds on another 1-2 degrees of timing in the background.

williamdb13

j9fd3s

iTrader: (3)

its like mine where its between rows, P17.5...
so its running 9 degrees Leading with like 5-7 degrees of split? i don't see what is odd about that?

what AFR is it hitting? what are you thinking timing should be? what kind of plugs are in it?

BLUE TII

iTrader: (9)

So scaled to a 2 bar map sensor (up to 14.5psi boost) that looks normal to me at 1st glance

Do you have any questions about specific areas of the maps?

Main map-
Lower idle timing than stock for smooth idle on a ported motor
Aggressive advance in vacuum for quick throttle response.

Trailing map-
low split/negative split in areas where turbo is generally just spooling (for increased egts to aid spool.) Looks like its sequential turbo still as the negative split isnt there at transition?
No split at idle for smoother idle on ported engine.

williamdb13

I guess my question is really related to when it’s under boost the leading timing being “low”, and then using the trailing split to essentially advance the timing. I thought that this was considered something not to do? Maybe that’s just a preconceived idea on my part. Thanks for sharing knowledge to all that are responding.

williamdb13

I just saw your comment about the turbo setup no this is a HKS t04r I believe on a s5 motor, with FD3S upper intake manifold and an AP engineering power fc. Thanks

cewrx7r1

iTrader: (2)

IGL looks normal for me.
But split is frigged up like many early ones where because the newbie tuners either did not know about how to adjust it correctly or just ignored it.
It is soooooooooo inconsistent!