For some odd reason I'm getting knock retard even though I'm spraying meth through a snow performance stage 3 kit. I'm running 93 octane with VP racing fuel M1 meth 100%. But for some odd reason I'm getting between 6 to 8 degrees of knock. I checked the knock sensor wires and the black wire did show signs of chaffing and a small area of the wire was exposed. It fixed the wire and added wireloom to protect it. I thought that was the culprit but it wasn't!!! Still getting knock... any help would be greatly appreciated. Thanks for looking
I'm getting knock with meth...
- Thread starter ddlopes
- Start date
Post some logs, it will provide insight...
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
To followup on FoMoCo's post: Has the KR been there the entire time you have been tuned for meth? A pump issue or a kink in the line have been the most frequent culprits hardware wise. Then there's nozzle size and placement to consider.
Check the pcm to see if it shows any misfire events. Hopefully compression is good.
Check the pcm to see if it shows any misfire events. Hopefully compression is good.
You are in a throttle plate? I want to say all but the direct port guys are running pre-blade nozzles, so you are possibly in a bit of less common territory.
Do you have a check valve in there so that the vacuum behind the TB is not sucking meth from the line before you start spraying?
3psi seems a bit on the low side, most people recommend 6psi start point.
Combination of the two could have your with more meth being injected than planned and causing an issue?
I do like SHodded's idea of returning to no meth tune and verifying if KR is present before you keep running meth tune. You want the car 100% solid before you add meth.
Do you have a check valve in there so that the vacuum behind the TB is not sucking meth from the line before you start spraying?
3psi seems a bit on the low side, most people recommend 6psi start point.
Combination of the two could have your with more meth being injected than planned and causing an issue?
I do like SHodded's idea of returning to no meth tune and verifying if KR is present before you keep running meth tune. You want the car 100% solid before you add meth.
Not sure, the progressive kit has a ramp up volume control.. but 3 psi is WAY lower than I'd expect.
*If* the volume of meth ramps to fast or has to high a initial flow it could be setting or even small amounts of fluid on the caps increasing g the compression.
I'd back off the onset to 5+ Pounds and retest..
*If* the volume of meth ramps to fast or has to high a initial flow it could be setting or even small amounts of fluid on the caps increasing g the compression.
I'd back off the onset to 5+ Pounds and retest..
Interesting things to note.. after cutting the data before the high speed and after the high speed (attached to post) I can see up to +7kr .. BUT it only occurs after shifting.
during the non-shift WoT your only hitting 18spark on average but it is stable.. it is low for meth in my humble opinion but it is behaving as it should.
what is your elevation ?
others will need to chime in but this looks like a tuning issue or a fuel quality / meth quality issue or issue with meth delivery issue with the nozzle..
during the non-shift WoT your only hitting 18spark on average but it is stable.. it is low for meth in my humble opinion but it is behaving as it should.
what is your elevation ?
others will need to chime in but this looks like a tuning issue or a fuel quality / meth quality issue or issue with meth delivery issue with the nozzle..
ddlopes said:
So there is something funky there.. for sure... you are not running a ton of boost and spark is conservative but you are pulling 8 degrees of spark...
IE. You are commanding 196.98kpa of boost (13.87psi) and hitting 19 degrees of spark on the multigear run and 23 on the third gear pull.. Brad has mine at 205kpa (15psi) and 28 degrees of advance and I have no knock retard.
So its normal to run a little richer than the command AFR when the meth starts spraying as it takes a split second for the ECU to pull the data from the widebands and make fueling adjustments. You are pulling about 15% fuel through the widebands but combined with your LTFT you are really only pulling around 11%.. which is NOT bad for spraying meth... I usually spray a bit more more than that..
What stands out is obviously the 8+ degrees of KR but how the meth is being delivered... its very inconsistent.. at least on bank 1.. the widebands should have a pretty linear appearance through the run (unless you are using the throttle to control load which you are NOT).. example would be that on the 3rd gear pull your wideband has a pretty gnarly upturn and i don't understand why.
It would be beneficial to see what bank 2 looks like honestly. Unless you are direct port meth like ZSHO, then bank 1 tends to get more meth than bank 2.. bank 2 could not be getting much spray so its knocking? We would need to see a log with bank 2's stats... Wideband (STFT and LTFT) along with lambase and lambda.
I don't see a fueling issue here from the standpoint of HPFP, LPFP, and how your car is reacting to the spray its getting. COuld it be a bad tank of gas? I have had this happen... scary as F when spraying to get a bad tank of gas...Maybe bad meth? Are you running 100% meth?
At this point, I am pretty sure the pump appears to be working.. but we need to see bank 2.