need some help guys, car is a JDM Evo VII on 9055 rom.

see the logs below. when tuning the car once full boost comes in (approx. 25psi) the car bucks slightly and well the logs indicate a lot of knock (in some cases 150?? counts) at this point timing is pulled to -14 somehow.

i tried pulling timing at the points where it happens but it did not help the stutter continues. AFRs are at 10-10.3 in that region (i also tried to richen up with no help).

in my opinion it seems like an ignition problem:

1. stock plugs are fouled from running to rich (plugs are 8s gapped at 25)?

2. coil packs leaking spark?

3. is it time for Sparktech (i highly doubt this on only 25 psi)

feel free to ask any questions. Thanks in advance.

 

gap the plugs to 22 and try else try coil packs

 

yeah i am thinking plugs, so it is ignition?

the guy wanted to buy a sparktech before the problem, i am sure that would help.

 

or rich misfire lol , im running more boost than that with ngk bpr8es plugs and stock coils no problems

 

yup thats why i am asking i have seen more boost before on the same plugs. i will most likely regap and try again.

 

KnockSum should max out at 43 counts.

And pull a maximum of 15 degrees retard.
(Octane will pull some timing also)

Somethings weird.

 

IMO 10.3 is a pretty rich rich, try leaning it out to around 11.3 at full boost. Also stupid question, but is it hitting boost cut?

 

my point exactly knock peaked at 154 degrees...for some reason timing went down to -14 (this car does not have the ignition retard limit removed).


i tried this, got the AFR to 11.3 and 11 same problem. nope fuel cut is 319, car peaks at 300 load.

IMO, the plugs are fouled due to running too rich previously. or spark plugs are just not gapped prooperly.

any ideas whether something mechanical can cause this?

PS: in the pictures when u see kock and the load dropping it is within the same gear, just realised it looks like the gears have changed while doing logs and it was shift knock.

 

update:

regapped colder plugs (9s) to 23 and tried again, same problem. i just noticed he has Nology plug wires, i have a feeling this is causing the problem.

any ideas?

 

take off the Nology wires pronto. And fouled plugs will definitely pee in your wheaties

 

ditch d nology! they have had bad reviews since the dsm days in d 4g63. ur oem wire (once they are in good condition) should do the trick. i used oem coils, wires and oem plugs at 26 gap when i run 22 psi to the redline. by d way are u runnin 25 psi on pump?

 

yup exactly what i am thinking, dont think the guy has the OEM coil. yes 25 psi on pump (long story)