Thread: Weird timing issue (maps and logs inside)

Setup:

Roller rocker stock block
Decked GTi-R head with 203psi compression across all cylinders
444cc + Z32 MAF
GTi-R T28 w/Front mount intercooler 11x30x2.5 - 2.25 in/out
Calum RT B14 ECU
Innovate LC-1

When at WOT and about 4600 rpm, the timing disrupts and will not show what should be from the timing map.

In the screenshots below is a log from a WOT 3rd gear run (I have a few issues with throttle cable so WOT is right there at 3.86V and not above 4V as usual), and at 4600rpm the timing goes down to 3 degrees.

I must confess that the knock sensor is damaged and the ECU knows because its throwing all along code #34. I strongly believe this could be the cause, but I like to hear some thoughts.

Can't say for sure without a working knock sensor and such. I think the obvious is the likely culprit here though. If not, you still need to fix it so it can be ruled out.

203 psi compression seems way high. You sure?

Yes, compression is that high

The Gti-R head was shaved and measured 0.010" or so below FSM height specs...

Checked with a different compression tester and got similar results (about 200)

I have some 9:1 Forged pistons to go with this but need another block to have no downtime when swapping. With 12cc dish they will still be around 9.7:1 or something with this same head

how do you have your a/fs on there?

AFR is around 12-12.5, havent passed 5500 rpms yet

If the knock sensor is bad/disconnected, the ECU will pull timing 7 degrees above 4600 rpm or if TP is above 56.

Dave

Is there a way to disable use of the knock sensor in the B14 Calum RT? That's worth a shot.
Also, I'm slowly learning a bit about how the Calum ECU works from talking to Vadim. Your map ending in 66 TP on the right looks like a bad idea (I know everyone else does it that way too).

Yes, change E038 from F1 to E1.

Dave

Isn't it also possible that the timing map should be copied to the knock map? That way the ECU can look at knock all it wants, but won't do anything with it?

IIRC that's what I did on the B14 RT. I didn't know you could disable knock feedback all together on the B14.

Without knowing any better, I'd be worried that if the ECU detected the knock sensor was bad (unreliable) it might just retard timing by a set amount regardless of the knock map.