Supercharged ZO6 problems
Thread Starter
Instructor
Joined: Sep 2009
Posts: 213
Likes: 4
From: Springfield Kentucky
Supercharged ZO6 problems
Have a stock LS7 with an ECS Paxton kit. Stock motor with the supplied pulley (6~7psi) and the car has a miss. When we tried to dyno the car, it dropped the timing down to like one degree and the fuel fell off as well at about 4500 rpm. I installed the supplied NGK 6's plugs at .035 like recommended and installed some heavy duty plug wire. It started it from day one so ECS sent me a new MAP sensor and are about to do a speed density tune but couldn't get any higher rpms.
Melting Slicks
Joined: Oct 2000
Posts: 3,368
Likes: 30
From: dfw Texas
Have a stock LS7 with an ECS Paxton kit. Stock motor with the supplied pulley (6~7psi) and the car has a miss. When we tried to dyno the car, it dropped the timing down to like one degree and the fuel fell off as well at about 4500 rpm. I installed the supplied NGK 6's plugs at .035 like recommended and installed some heavy duty plug wire. It started it from day one so ECS sent me a new MAP sensor and are about to do a speed density tune but couldn't get any higher rpms.
What did you do for fuel? injectors? Bap? Stock? What did the plugs you pulled out look like? Black? Tan? Any damage to them?
Thread Starter
Instructor
Joined: Sep 2009
Posts: 213
Likes: 4
From: Springfield Kentucky
I do hear a slight miss fire at idle but not throwing any codes. We watched it on a snap-on version of the tech2 and saw 1,2,7 having a miss at times I believe were the cylinders. ECS kit comes with KB BAP, 60# injectors and the plugs looked good when we pulled them out. Have not looked at the duty cycle yet but I don't think thats the problem because the plugs lood great with about 250-300 miles on them. The car will run good and then jerks upon accelerating. When I say it misses at idle, I mean the car doesn't show it a lot, but I can tell because it sounds like a cam lope.
Melting Slicks
Joined: Oct 2000
Posts: 3,368
Likes: 30
From: dfw Texas
I do hear a slight miss fire at idle but not throwing any codes. We watched it on a snap-on version of the tech2 and saw 1,2,7 having a miss at times I believe were the cylinders. ECS kit comes with KB BAP, 60# injectors and the plugs looked good when we pulled them out. Have not looked at the duty cycle yet but I don't think thats the problem because the plugs lood great with about 250-300 miles on them. The car will run good and then jerks upon accelerating. When I say it misses at idle, I mean the car doesn't show it a lot, but I can tell because it sounds like a cam lope.
Thread Starter
Instructor
Joined: Sep 2009
Posts: 213
Likes: 4
From: Springfield Kentucky
That's what we're doing. Doing a drive also to see what is going on when the cylinder has a miss. Does great at cruising with no pull on the motor, but as soon as it gets a pull on the motor or I try to accelerate any, the car will jump a little.
Premium Supporting Vendor
Joined: Oct 2004
Posts: 23,599
Likes: 1,224
From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
I had an LS7 a while back that once we installed the charger it lost a coil pack. Drove fine prior to the install, just couldnt handle the additional load I guess. Just an example.
With a straight miss like this, you really have to just go back to the basics, it's no different with or without a charger.
If I can help let me know.
With a straight miss like this, you really have to just go back to the basics, it's no different with or without a charger.
If I can help let me know.
Thread Starter
Instructor
Joined: Sep 2009
Posts: 213
Likes: 4
From: Springfield Kentucky
Thanks Doug, I've had a long and troublesome road with this kit and this is just no fun anymore. I have been waiting on my tune from Matt for the new MAP sensor since back in March and I have given up hope on getting that since I have emailed two reminders since then.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Thread Starter
Instructor
Joined: Sep 2009
Posts: 213
Likes: 4
From: Springfield Kentucky
Le Mans Master
Joined: Nov 2001
Posts: 6,783
Likes: 4
From: Ohio
Swap coils/wires with known good cylinders and suspected miss cylinders (1,2,7) then see if the problem follows the coils or stays with the cylinders. If it follows the coils, then swap the wires and recheck and you should have your answer
Le Mans Master
Joined: Nov 2001
Posts: 6,783
Likes: 4
From: Ohio
I don't think so...but I would suggest just doing the swap I spoke of first, since you don't want to add to the confussion by inserting an additional variable to the troubleshooting using the GTO coils
Former Vendor
Joined: Jun 2006
Posts: 1,622
Likes: 3
From: Dallas TX
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,684
From: Southeast TX
I'd bet they'd be the same. (((Edit...forgot we were dealing with an LS7))). Might even be a part # on them. Agree with the others on the spark plugs. I've seen it more than once where a near brand new plug was bad (one was a TR6 too). Also, inspect the wires closely. A weak one can sometimes run fine on a mild load, but bang out when under boost.
Last edited by old motorhead; Apr 11, 2011 at 08:26 PM.
Racer
Joined: Nov 2008
Posts: 264
Likes: 0
From: Illinois
I was dynoing my Z today as well and we had 3 cylinders miss fire as well..D1 procharger 6 to 7 lb of boost, stock motor as well ..Changed out the 3 plugs and will see tomorrow when we do the 2 final pulls..I hope this is not the start of some thing to?? Is it that the coils cant take the boost or what is it. Same plugs by the way TR6's...
Thread Starter
Instructor
Joined: Sep 2009
Posts: 213
Likes: 4
From: Springfield Kentucky
I was dynoing my Z today as well and we had 3 cylinders miss fire as well..D1 procharger 6 to 7 lb of boost, stock motor as well ..Changed out the 3 plugs and will see tomorrow when we do the 2 final pulls..I hope this is not the start of some thing to?? Is it that the coils cant take the boost or what is it. Same plugs by the way TR6's...