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Corvette
Corvette Performance
Weird Dyno Result
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<blockquote data-quote="Jr. Corvette" data-source="post: 220447" data-attributes="member: 1906"><p>Hi Cable guy,</p><p></p><p>Ya, that helps a bit. However the reason I use the ZZ6 specs is because all GM changed from the ZZ4 to the ZZ6 was the heads and cam and even then they still weren't top of the line. I've also read that 1 point of compression ratio generally increases HP by 3-4%. So let's assume even though I put all these improved parts on the engine I still only managed to get 405hp and 403torque if I was running 10.5:1. Now let's factory in the compression ratio by taking 8% off those numbers. So 372hp and 370FtLb. Now factoring in a 15% drivetrain loss. So it would be 316rwhp and 314rwFtLbs. That's still a 48rwhp discrepancy and that's assuming everything I did was practically useless and I wasted ten grand on parts I didn't have too. I will say there are guys running ZZ4's with just bigger heads and 8.5:1 running 7lbs of boost making around 610hp. I know it's hard to compare builds and who's really to say what's going on but even that dyno graph doesn't match how the car feels and I had a different engine in the car before and I know how much faster it is. Given all the discrepancy's and issues I've pointed out and the poor results from everybody there today while they keep telling people to come see them to fix all of these problems it just seems wrong. I think I will get another dyno done just because of how wrong I felt this was just to see if the shop was being honest or not. I appreciate all the opinions never the less. I just can't believe those numbers to how the car performs.</p></blockquote><p></p>
[QUOTE="Jr. Corvette, post: 220447, member: 1906"] Hi Cable guy, Ya, that helps a bit. However the reason I use the ZZ6 specs is because all GM changed from the ZZ4 to the ZZ6 was the heads and cam and even then they still weren't top of the line. I've also read that 1 point of compression ratio generally increases HP by 3-4%. So let's assume even though I put all these improved parts on the engine I still only managed to get 405hp and 403torque if I was running 10.5:1. Now let's factory in the compression ratio by taking 8% off those numbers. So 372hp and 370FtLb. Now factoring in a 15% drivetrain loss. So it would be 316rwhp and 314rwFtLbs. That's still a 48rwhp discrepancy and that's assuming everything I did was practically useless and I wasted ten grand on parts I didn't have too. I will say there are guys running ZZ4's with just bigger heads and 8.5:1 running 7lbs of boost making around 610hp. I know it's hard to compare builds and who's really to say what's going on but even that dyno graph doesn't match how the car feels and I had a different engine in the car before and I know how much faster it is. Given all the discrepancy's and issues I've pointed out and the poor results from everybody there today while they keep telling people to come see them to fix all of these problems it just seems wrong. I think I will get another dyno done just because of how wrong I felt this was just to see if the shop was being honest or not. I appreciate all the opinions never the less. I just can't believe those numbers to how the car performs. [/QUOTE]
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Corvette
Corvette Performance
Weird Dyno Result
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