[flexinator]

I have been playing around with timing on my car with e85. I noticed when I log timing corrections for each cylinder and actual timing on cylinder 1 I got some strange results tonight... There are no timing corrections, but the acutal timing drops from 9 to 2 to 0 then back to 9 then back down to 0 and stays around there. Car ran really well... up until now I haven't seen timing pulls.

Why is the timing being pulled without anything logged under timing corrections? Here is the data and a graph...

[flexinator]

I just lowered the timing a degree or so along the middle and ran another log.

Looks much happier now. I guess my question is, it is now running what I am asking almost the same as before... if I was asking for too much why was it dropping the timing by 9 degrees or so if it could handle only 1 degree less...

I am lost

[flexinator]

What's up with the lack of interest lately...

Anyone?

[Ilma]

I don't run Cobb.....but to me it looks like in your first datalog, you had a brief but significant throttle closure.

Your boost and throttle both take a nosedive around 3500 rpms (if I am reading that graph correctly).

So some event took place there and timing was probably reacting to this via the DME. So no timing corrections since the DME probably switched to a failsafe timing table when this event happened and targeted the timing curve you see on that graph.

So I don't think the issue is with timing......you have to start questioning why you had throttle closure.

[flexinator]

I think I took my foot off the pedal for a sec... I just assumed timing would get back after a second or so

[flexinator]

i did take my foot off the pedal, but the timing drops .1s before that event... I wonder if its just a problem with the log and the timing drop had to do with my foot... Maybe the whole first log is worthless because I let my foot off for a second

[enrita]

You need to make many logs of 3-4 th gear and see how it looks even when heatsoaking. Basically you need to test a lot with different conditions of temps.
1 log does not tell how the car runs.