dissapointing dyno results...
dissapointing dyno results... Car was just dyno tuned. Its a fully forged 383 ,home ported heads/intake, gm847 cam, 1.6rr with upgraded comp springs and trick flow 1 piece pushrods, lpe cai , built 4l60e and a pic 3600 stall. Stock auto gears in a stock 9104 bolt.
Last year before the rebuild, the car put down 380 hp..... it now puts down 320 peak. The only thing besides the motor refresh that was changed was 17" wheels from the 18's I had, and going from a stock converter to the ptc. Does a converter have that much effect on dyno hp????
Last year before the rebuild, the car put down 380 hp..... it now puts down 320 peak. The only thing besides the motor refresh that was changed was 17" wheels from the 18's I had, and going from a stock converter to the ptc. Does a converter have that much effect on dyno hp????
Joined: May 2004
Posts: 1,593
Likes: 267
From: Halfway back on the Highway to Hell...again!
1st, it's a dyno! Don't get too upset. A dyno is nothing more than a tuning tool. They are all different. Even the same ones may vary after a year if the owner doesn't keep up on calibrations. And that can be expensive.
2nd. A stall can be very detrimental to #'s based on lock, STR etc.
3rd. It could also be in the tune to engine and trans after the upgrades. The only truth to mods is in track times.
Ask yourself, Does it feel more powerful?" If it does, then it does.
2nd. A stall can be very detrimental to #'s based on lock, STR etc.
3rd. It could also be in the tune to engine and trans after the upgrades. The only truth to mods is in track times.
Ask yourself, Does it feel more powerful?" If it does, then it does.
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
1st, it's a dyno! Don't get too upset. A dyno is nothing more than a tuning tool. They are all different. Even the same ones may vary after a year if the owner doesn't keep up on calibrations. And that can be expensive.
2nd. A stall can be very detrimental to #'s based on lock, STR etc.
3rd. It could also be in the tune to engine and trans after the upgrades. The only truth to mods is in track times.
Ask yourself, Does it feel more powerful?" If it does, then it does.
2nd. A stall can be very detrimental to #'s based on lock, STR etc.
3rd. It could also be in the tune to engine and trans after the upgrades. The only truth to mods is in track times.
Ask yourself, Does it feel more powerful?" If it does, then it does.
Wifes car only lays down 365 at the tire....but runns 11s
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Come on guys a 383 with a 847 making 320 peak flat out indicates issues and the usual dynos a tool aint gonna fly here. Op has an issue, I would look for misfires, port quality or the tune itself.
TECH Enthusiast
Joined: Feb 2012
Posts: 631
Likes: 0
From: Orlando
Car was just dyno tuned. Its a fully forged 383 ,home ported heads/intake, gm847 cam, 1.6rr with upgraded comp springs and trick flow 1 piece pushrods, lpe cai , built 4l60e and a pic 3600 stall. Stock auto gears in a stock 9104 bolt.
Last year before the rebuild, the car put down 380 hp..... it now puts down 320 peak. The only thing besides the motor refresh that was changed was 17" wheels from the 18's I had, and going from a stock converter to the ptc. Does a converter have that much effect on dyno hp????
Last year before the rebuild, the car put down 380 hp..... it now puts down 320 peak. The only thing besides the motor refresh that was changed was 17" wheels from the 18's I had, and going from a stock converter to the ptc. Does a converter have that much effect on dyno hp????
Ok. It was 334 hp and 344tq . Car has a 3600 stall. The dyno was different. I have it back... and the butt dyno says it's much faster.
I know it would benefit from better heads.
We'll see what times it runs.
I know it would benefit from better heads.
We'll see what times it runs.
^THIS^
Since you've now said it was a differennt dyno, no need to be concerned at all. @ssed-up dyno results are not uncommon. Some of the operators don't have enough understanding to even follow the operating manual
Calculating hp from your trap speed and race weight will be far more accurate than any dyno.
Since you've now said it was a differennt dyno, no need to be concerned at all. @ssed-up dyno results are not uncommon. Some of the operators don't have enough understanding to even follow the operating manual
Calculating hp from your trap speed and race weight will be far more accurate than any dyno.
Obviously you've seen a dyno operator blow up a motor because they didn't know how to set the load, what gear to do the pull in, etc.