Pinging during acceleration
Thread Starter
Instructor
Joined: Sep 2008
Posts: 133
Likes: 1
From: Gold River CA
Pinging during acceleration
About a month ago, I noticed some pinging on acceleration. (2007 MN6 with Vortech V-2 Si-trim) Tried both Klotz and adding in 4-5 gallons of Sunoco 100 that did not cure the pinging.
Brought the car to Nick at Newtech who was able to tune to eliminate the pinging.
However, to eliminate the pinging, Nick had to basically zero out timing in several areas to stop the pinging. Although no more pinging, below about 2000 rpm, the engine is sluggish in the range where the timing was removed. 
I am dropping the car off with Nick on Saturday to try to figure out what is causing the pinging issue, fix and and restore the old tune. I don't want the pinging, but the low rpm sluggishness is getting annoying. One of Nick''s thoughts was possibly oil getting into intake manifold from PCV. Anyone have any thoughts on what might be cause of the pinging?
Brought the car to Nick at Newtech who was able to tune to eliminate the pinging.
However, to eliminate the pinging, Nick had to basically zero out timing in several areas to stop the pinging. Although no more pinging, below about 2000 rpm, the engine is sluggish in the range where the timing was removed. I am dropping the car off with Nick on Saturday to try to figure out what is causing the pinging issue, fix and and restore the old tune. I don't want the pinging, but the low rpm sluggishness is getting annoying. One of Nick''s thoughts was possibly oil getting into intake manifold from PCV. Anyone have any thoughts on what might be cause of the pinging?
Racer
Joined: Oct 2005
Posts: 425
Likes: 0
From: Newport Beach, CA
St. Jude Donor '10
I had an odd issue that gave my tuner some headaches. Turns out it was from clogged cat. Somehow my cat's innards had broke apart a small bit that formed itself into the perfect ball-like shape to wedge itself in my exhaust.
I also had some issues with oily-MAF.
I also had some issues with oily-MAF.
Advanced
Joined: Apr 2010
Posts: 84
Likes: 0
From: Overland Park KS
Your setup (a vortech) at 2k RPM will only be generating like 2-3psi, right? Assuming that's correct, I couldn't imagine how you'd be getting preignition with 2-3psi + 100 octane... but retarding the timing fixed it. 
Have you checked your base timing?
I would say unless the tune is way off or something else is causing issues. Good luck! I'm sure it's something simple.
Have you checked your base timing?I would say unless the tune is way off or something else is causing issues. Good luck! I'm sure it's something simple.
