Pinging?

[Dennis Reinhart]

The only way to keep the good performance of the SCT tune and eliminate "tip in" knocking is to keep the TC unlocked at low speeds so as to keep engine RPM's up!!! :up:

Lidio has done this very effectively and I would think by now Dennis can do it as well?? :bows: Lidio locks the TC in 4th gear only above 60 MPH....Mine is currently set to lock in 4th gear only at 50 MPH.....It also unlocks automatically below 40 MPH!!! :banana:

The elimination of the TC lockup at lower speeds allows the engine RPM's to increase as the TC "slips" and eliminates that damn knocking!! :up:

BTW...Before the changes above I found that mine would only knock when the TC was locked and the RPM's were between 1000 and 1200....when accelerating slightly. Any more throttle and it would downshift with considerable knocking!!

I think SCT is working on a file that allows the TC to unlock when coasting or braking?? Maybe Dennis can address this??

Marauderjack :bounce: :beer: :up:

This issue never happened till we went to the new file format NO one has complained of tip in spark knock on the old Diablo chips, Tip in started when we converted files to SCT, This has been corected I have spoke on this several times. The issue was with some files on SCT that did not get converted properly, all this has now been taken care of, David at SCT has made a speacial value file that Jack is using, I can delay torque converter lock up just like Lidio we use the same software, this may be what some of you would like if so I will do it but the tip in spark knock can be cured without moving the lock up point up, it was do to slight error in the software SCT has fixed that, I have added this to all files along with a better spark table and the files are as good as the original files we sold last year before going to SCT

 

[studio460]

This issue never happened till we went to the new file format NO one has complained of tip in spark knock on the old Diablo chips, Tip in started when we converted files to SCT, This has been corected I have spoke on this several times. The issue was with some files on SCT that did not get converted properly, all this has now been taken care of, David at SCT has made a special value file that Jack is using, I can delay torque converter lock up just like Lidio we use the same software, this may be what some of you would like if so I will do it but the tip in spark knock can be cured without moving the lock up point up, it was do to slight error in the software SCT has fixed that, I have added this to all files along with a better spark table and the files are as good as the original files we sold last year before going to SCT

Dennis:

My Marauder has knocked under load at low RPMs since my intial dynotune with Jerry and Chris, and following subsequent retunes by Chris at SCT. My question to you, Dennis, is, does this "software glitch" affect files generated by SCT from a dynotune also? I now have all my original dynotune .zcf files from Jerry's laptop, thanks to David's help at SCT. In total, I have about a dozen SCT .zcf files for my CRD1 Marauder--do they all need "correcting?" I'm only asking this here because this is the first time I've heard of this apparently known problem with SCT files. I have the programmable SCT 9100 tuner and Advantage software that I purchased directly from SCT, so any technical support from you, Dennis, on this specific issue would be out of your generous kindness--thanks!

 

[studio460]

1. I already have the cooling mod installed and occasionally still knock at low RPMs.
2. Returned DR's SCT tuner a few months back for reprogram and reinstalled. Still have knocks - maybe it needs to be reprogrammed again?
3. How about if we add a few gallons of racing fuel when filling up to enrich the 91 gas? Maudominquez' idea - costly but may work?

Hey there, ParkRanger!

Well that's NOT good news about the cooling mod (which I just received, but haven't installed yet). Do you also have colder Denso plugs (I went two-steps colder to IT-22s) and a 180-degree thermostat? Keeping 55-gallon drums of Toulene around to increase my octane is simply out of the question for me since I live in an apartment. Hopefully, there IS some kind of programming glitch with our current SCT files that can be corrected. We'll have to just wait until someone can sort this out and communicate to us what the corrective procedure is. Maruaderjack's suggestion may be the only solution.

 

[studio460]

Before the changes above I found that mine would only knock when the TC was locked and the RPM's were between 1000 and 1200 . . . when accelerating slightly. Any more throttle and it would downshift with considerable knocking . . . I think SCT is working on a file that allows the TC to unlock when coasting or braking?? Maybe Dennis can address this??

Marauderjack:
These are the EXACT SAME SYMPTOMS/PROBLEMS I have been having since my SCT dynotune by Jerry. And this is after SEVERAL retunes from both Jerry and Chris. I hope your on to something here because I'm growing pretty weary of trying to resolve this issue.

 

[studio460]

[. . . the knocking] was due to slight error in the software SCT has fixed that.

How do those with SCT 9100 tuners/SCT Advantage tuning software fix their own files?

 

[Dennis Reinhart]

NBC Shooter you have a totally different situation your car was tuned on a dyno so you have an optimal tune, the car is tuned for peak RWHP so you are running as much tuning as Jerry has dialed in while watching real time data such as knock sensor activity, so having the car on the dyno is one thing, having it on the street under a full load is another, there is nothing to be weary about, its a minor fix if your car is flashed you can suck the flashed file out with the tuner. I can take that file that is stored in the tuner and retrieve it and pull about 1 or 2 degrees of timing this will cure your issue, this is not the same thing that other people have had issues with all this has been corrected, you have a separate problem that is easily fixed.

 

[darebren]

I hate to add another post here, but thanks everyone, I finally figured out what the new noise is I hear after i had my headers installed.. maybe i just never heard it before, but now at around 1,000 RPM's i get a rattle/buzz that seems to be out of the passenger side exhaust pipe.. and maybe it is this ping/spark tip in.

I am going for dyno tune soon anyway, so we will see what shakes out of that pretty soon... want the A?F ratio boosted anyway.. and a second program to take out timing for the NOS.

 

[DirtyDog]

I hate to add another post here, but thanks everyone, I finally figured out what the new noise is I hear after i had my headers installed.. maybe i just never heard it before, but now at around 1,000 RPM's i get a rattle/buzz that seems to be out of the passenger side exhaust pipe.. and maybe it is this ping/spark tip in.

I am going for dyno tune soon anyway, so we will see what shakes out of that pretty soon... want the A?F ratio boosted anyway.. and a second program to take out timing for the NOS.

Check that rattle and see if it is coming from your cat. Kooks has had problems with some Magnaflow Cats. Mine went out with only 200 miles on it.