Torque curve is weird on LS3
Thread Starter
Heel & Toe
Joined: Aug 2017
Posts: 16
Likes: 0
Torque curve is weird on LS3
I have a brand new LS3 with a cam in my 1967 GTO. Great motor of course, and there is nothing better than cruising in this old muscle car. After 2500 miles I had it tuned by a very experienced tuner. He did a great job improving the everyday, around-town drivability. However the dyno revealed a dip in the torque curve at about 4700 rpm that he could not tune out (attached). He thinks it could have something to do with the ground or the 50 yr old ignition switch. The builder is a EE who consults for power generation plants so he knows how to ground things, however the igintion switch was problematic during the build. Apparently these old switches are not designed to keep power to the computer during starting. He had to wire it differently but that's all I know. Question: Has anyone experienced this type of torque curve and if so, what was the cause and fix? I am not hesitant about having my builder putting in a new ignition switch so if this could be the cause does anyone have any recommendations for the actual switch model number to use? This winter I want to add a super charger but I am not going to do it until the motor is running right to begin with. Thanks all.
Melting Slicks
Joined: Jun 2006
Posts: 2,497
Likes: 261
From: Miami Florida
My car was loosing traction with 335 35 17 Hoosier drag radials on a knurled roller applied some VHT track bite done.
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Thread Starter
Heel & Toe
Joined: Aug 2017
Posts: 16
Likes: 0
Thanks. I have no experience with tuners so I could only go by what others at car shows and my builder suggested. I ran the notion of wheel slippage by him and he says there definitely was no slippage. Someone has the answer. I'll find it.
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Joined: Sep 2016
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Melting Slicks
Joined: Jun 2006
Posts: 2,497
Likes: 261
From: Miami Florida
Op it doesn't appears as torque converter generated.