Infamous1 Posted December 18, 2009 Share Posted December 18, 2009 Here is a thought. How about I fill up with 94 octane or even 100 and see if there is ANY knock at all. I mean I know we are dealing with winter gas and all, but if there still is knock, shouldn't this tell us there is something mechanically wrong, such as a knock sensor acting up or another component making the sensor think there is knock? That usually doesn't take affect in WOT runs. It seems your car has been running this way for months now. You are seriously putting your engine at risk with all the consistant knock events at high loads. Link to comment Share on other sites More sharing options...
fishbone Posted December 19, 2009 Share Posted December 19, 2009 It has been running like this for over a year now. What were you referring to when you said it does not take effect in WOT runs? Link to comment Share on other sites More sharing options...
fishbone Posted December 20, 2009 Share Posted December 20, 2009 Okay ... so I reset the ECU to see what IAM would do since I have a tank of 93. Stayed at 1.0 but it's back down to 0.88. How is it possible for a mild 91oct map to knock on 93oct? Link to comment Share on other sites More sharing options...
LittleBlueGT Posted December 20, 2009 Author Share Posted December 20, 2009 Okay ... so I reset the ECU to see what IAM would do since I have a tank of 93. Stayed at 1.0 but it's back down to 0.88. How is it possible for a mild 91oct map to knock on 93oct? You have to log the knock, so we can see where it is affecting the DAM. The ECU has a load/rpm range in which knock can eventually affect DAM. Read the sticky on RR, then catch it in a log. Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
iNVAR Posted December 20, 2009 Share Posted December 20, 2009 not to be a jerk fishbone, but you have your own thread devoted to troubleshooting your own car already. two threads in fact. i suggest you keep updating that thread since all the relevant info is in there. Link to comment Share on other sites More sharing options...
fishbone Posted December 20, 2009 Share Posted December 20, 2009 ^iNVAR, it was a general question. Is it possible for mild maps tuned for 91 to knock at all on 93? Link to comment Share on other sites More sharing options...
iNVAR Posted December 20, 2009 Share Posted December 20, 2009 sure. my stg1 91 AND stg2 91 octane cobb maps both knocked on 93 octane gas a tiny bit, from different stations. and here in nyc, i know the tankers come frequently so it's not like the gas sits in the station and goes bad. pertaining to YOUR car though, i have no idea what's wrong. you seem to have a slew of problems regardless of what map you're running. i suggest you stop looking at it being map related and start looking at other problems. there's no reason you should get so much knock as to reduce your DAM/IAM on all these different maps. Link to comment Share on other sites More sharing options...
fishbone Posted December 20, 2009 Share Posted December 20, 2009 Definitely am not meaning to threadjack, I was just asking a general question. I'll pull logs and we'll figure out what my scenario is. I was just under the impression that 93 octane is a decent margin of error to make a 91 map run spotless. Sure, Nebraska gas is shit, but really now ... Link to comment Share on other sites More sharing options...
NSFW Posted December 20, 2009 Share Posted December 20, 2009 I was just under the impression that 93 octane is a decent margin of error to make a 91 map run spotless. Your basic idea seems good to me, however "spotless" is too optimistic. I bet the knock sensor would still go off with some bogus knock even if you were running race gas with > 100 octane. Running 93 on a 91 tune is still a good investigative idea though, when your car is (or seems to be) knocking a lot. Link to comment Share on other sites More sharing options...
fishbone Posted December 21, 2009 Share Posted December 21, 2009 Well, spotless is a relative term with our motors it seems. I guess the idle false knock will never go away unless you tell the sensor to ignore it. But under load I would expect no knock on 93 or 94 if you can get a 91 map to run half decent. Either way, it's a specific matter to my car from this point on. Link to comment Share on other sites More sharing options...
05pearl Posted December 21, 2009 Share Posted December 21, 2009 I have a lot of low load knock, most likely something rattling that I could never find. It even happened on E85. I eventually had Infamous1 raise the threshold of the flkc to ignore the knock in the low load areas of concern. I don't know if this would apply to your situation or not though. Link to comment Share on other sites More sharing options...
iNVAR Posted December 21, 2009 Share Posted December 21, 2009 fishbone, you should knock everything. don't even do WOT pulls anymore. just log your driving, all the time. until you figure out wtf is wrong. Link to comment Share on other sites More sharing options...
fishbone Posted December 21, 2009 Share Posted December 21, 2009 28 knock events under almost no load, very low rpms? Yeah, I'd say so Link to comment Share on other sites More sharing options...
fishbone Posted December 21, 2009 Share Posted December 21, 2009 fishbone, you should knock everything. I don't need to, my motor is already doing all the knocking (I know what you meant) Link to comment Share on other sites More sharing options...
iNVAR Posted December 21, 2009 Share Posted December 21, 2009 oops, yeah, i meant log. Link to comment Share on other sites More sharing options...
fishbone Posted December 21, 2009 Share Posted December 21, 2009 Cobb needs to incorporate the ability to log/view Knock Sum and FBKC with the AP. It is a bitch to interpret FBKC based on DA. i have to pull the table in RR and compare every time. Link to comment Share on other sites More sharing options...
spec.B Dream Posted December 24, 2009 Share Posted December 24, 2009 Paul, I have a tactrix cable you can borrow if that will help you pull better logs. Let me know if you want to meet up. Link to comment Share on other sites More sharing options...
fishbone Posted December 24, 2009 Share Posted December 24, 2009 Thanks man! qikslvr hooked me up with his cable which worked like a dream. Pulled some logs and will buy my own cable. The Autonostics I have now is either defective or not compatible. Link to comment Share on other sites More sharing options...
youknowit Posted March 6, 2010 Share Posted March 6, 2010 Here are my logs with Cobb 91 with sunoco 93, Stock everything down to the paper filter.Sunoco 93 Cobb 91 (2).csvSunoco 93 Cobb 91 (4).csv Link to comment Share on other sites More sharing options...
NSFW Posted March 6, 2010 Share Posted March 6, 2010 You're getting a lot of knock correction during cruise, which I find strange. Can anyone shed some light on that? You're not logging pulls, so those logs aren't going to tell us much. However, don't start logging pulls just yet. That knock in cruise is cause for concern. Please read this before you log again: http://www.romraider.com/forum/topic5384.html And if anyone has suggestions on how to translate some of the parameter names in that how-to into Cobb-speak, please let me know. Link to comment Share on other sites More sharing options...
LittleBlueGT Posted March 6, 2010 Author Share Posted March 6, 2010 Knock Correction (deg) = FBKC Knock Learning (deg) = FLKC Learned ignition still has me confused. I will try and look it up from COBB . Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
youknowit Posted March 6, 2010 Share Posted March 6, 2010 You're getting a lot of knock correction during cruise, which I find strange. Can anyone shed some light on that? You're not logging pulls, so those logs aren't going to tell us much. However, don't start logging pulls just yet. That knock in cruise is cause for concern. Please read this before you log again: http://www.romraider.com/forum/topic5384.html And if anyone has suggestions on how to translate some of the parameter names in that how-to into Cobb-speak, please let me know. Yeah tell me about it, my tuner is working with cobb to figure out the problem. They are thinking a wacko knock sensor. Link to comment Share on other sites More sharing options...
KCSunshine Posted March 8, 2010 Share Posted March 8, 2010 Here are my logs with Cobb 91 with sunoco 93, Stock everything down to the paper filter. I have that Issue too, I dont know why it happens. whenever I drive from a stop or when I brake, I hear faint tapping sounds and a loud knock when I brake hard. After that my log would show constant -1 fine learning. Sometimes it goes to 0. Got my oil change and he said the tapping is from transmission.... any ideas?street driving.csv Link to comment Share on other sites More sharing options...
Underdog Posted March 19, 2010 Share Posted March 19, 2010 (edited) Great thread. I think I picked up a few tips. Thanks Edit: What is the general consensus about knock during very low load/rpm conditions? I have my own theories about this and have taken some unusual measures against it but I'm curious what you guys think? Example: Crusing on the highway at 70MPH with constant throttle input, manifold pressure at -8PSI, ecu reports feedback/fine learning knock and pulls from 2 to 8 degrees. I've seen it on cars ranging from stock to stage 2/350whp level. No amount of reduced timing in the tune seems to have any effect on this. I know this was resolved on page 1, but I just wanted to post up a log and LV for others to look at. The car was dyno/pro-tuned by Mike/Tuning Alliance. The car seems very stable during pulls (I think) but I have a lot of low load, low rpm knock. Very similar to what Weitek posted above. I have noticed that when I'm on the on-ramp going through the gears at medium-heavy load I will get one or two knock events. Other than that and some part throttle stutter the car drives great. I'm looking forward to upgrading the intercooler and possibly fuel so I can uncork this setup a bit more. BTW, is there a list of what to log for people who want to do a lot of CL logging with Tactrix 2.0 and a microSD card? *edit: didn't realize my filesize was over the limit. Will take a log and post it tomorrow.LearningView_3-18-2010 6 37 24 PM.csv Edited March 19, 2010 by Underdog The Crimson Dynamo Link to comment Share on other sites More sharing options...
LittleBlueGT Posted March 19, 2010 Author Share Posted March 19, 2010 I know this was resolved on page 1, but I just wanted to post up a log and LV for others to look at. The car was dyno/pro-tuned by Mike/Tuning Alliance. The car seems very stable during pulls (I think) but I have a lot of low load, low rpm knock. Very similar to what Weitek posted above. I have noticed that when I'm on the on-ramp going through the gears at medium-heavy load I will get one or two knock events. Other than that and some part throttle stutter the car drives great. I'm looking forward to upgrading the intercooler and possibly fuel so I can uncork this setup a bit more. BTW, is there a list of what to log for people who want to do a lot of CL logging with Tactrix 2.0 and a microSD card? *edit: didn't realize my filesize was over the limit. Will take a log and post it tomorrow. Just post a few logs (preferably edited excerpt) and we will help you out. Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
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