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C6 Z06 issues

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Old Apr 16, 2022 | 11:12 PM
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Default C6 Z06 issues

My c6Z slowed down 2 seconds in the quarter. I sold the car and bought it back about a year ago. It is a hci nitrous built engine Z. When I built the car it ran mid 9's, the last time out it ran 11.80.

It runs and drives fine, I've been around and around trying to figure out the issue as to why it slowed down so much and I come up empty handed. Has anyone had something similar happen? Tune is good, compression, and plugs are fine. I'm stumped.
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Old Apr 17, 2022 | 03:00 AM
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Originally Posted by brandon1566
My c6Z slowed down 2 seconds in the quarter. I sold the car and bought it back about a year ago. It is a hci nitrous built engine Z. When I built the car it ran mid 9's, the last time out it ran 11.80.

It runs and drives fine, I've been around and around trying to figure out the issue as to why it slowed down so much and I come up empty handed. Has anyone had something similar happen? Tune is good, compression, and plugs are fine. I'm stumped.
weird. have you had it dynod
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Old Apr 17, 2022 | 07:55 AM
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Maybe owner turned down timing. But like he said i would get it in the dyno. Or ur just rusty.
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Old Apr 17, 2022 | 08:28 AM
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Do you have any history of runs without using nitro? If you can compare that with runs now without nitro that may exclude or include the nitro system as the problem.
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Old Apr 17, 2022 | 10:15 AM
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Originally Posted by brandon1566
My c6Z slowed down 2 seconds in the quarter. I sold the car and bought it back about a year ago. It is a hci nitrous built engine Z. When I built the car it ran mid 9's, the last time out it ran 11.80.

It runs and drives fine, I've been around and around trying to figure out the issue as to why it slowed down so much and I come up empty handed. Has anyone had something similar happen? Tune is good, compression, and plugs are fine. I'm stumped.
Maybe the last owner installed a mild/stock cam? Still, should be better that high 11s. Trap SPEED is more indicative of power output than E.T's are. What trap speeds are you seeing? If I had a 1,000hp LS7, my old *** might see low 11s, but would probably trap 175mph+
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Old Apr 17, 2022 | 06:38 PM
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Originally Posted by grinder11
Maybe the last owner installed a mild/stock cam? Still, should be better that high 11s. Trap SPEED is more indicative of power output than E.T's are. What trap speeds are you seeing? If I had a 1,000hp LS7, my old *** might see low 11s, but would probably trap 175mph+
The fastest it's been is 152mph on the 200 shot and 139 on motor. The last time out it went 128 on motor and 132mph on a 200 shot. Now that I'm typing this out I'm thinking it could be a nitrous issue and I just forgot how to drive.
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Old Apr 19, 2022 | 09:33 PM
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blew up the LS7 and dropped in an LS3? :P
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