[ninetres]

Gang. There’s is so much more to the number a dyno spits out than ambient weather. Even the weather correction each individual dyno uses can be calculated using different equations. Each are calibrated individually, and stray away from calibration over time. Long term dyno maitnance effects number output. Design effects number output. Software settings effect output. There are endless other factors that effect output.

With alllllll the factors that are in play in a single arbitrary dyno pull.....it renders cross comparing different runs on different dynos entirely useless. Even using a dyno for its intended purpose (response to modification) requires a certain level of attention to detail to even extrapolate useful data from the same car on the same dyno. A single “number” put out on a dyno can not be “good or bad”. It’s a baseline. Nothing more.

If you can’t except this it’s totally fine. But it’s not an opinion. It’s fact.

[onfire]

Nice numbers. Killer dyno cell.

[BlaqWhole]

Originally Posted by ninetres

Gang. There’s is so much more to the number a dyno spits out than ambient weather. Even the weather correction each individual dyno uses can be calculated using different equations. Each are calibrated individually, and stray away from calibration over time. Long term dyno maitnance effects number output. Design effects number output. Software settings effect output. There are endless other factors that effect output.

With alllllll the factors that are in play in a single arbitrary dyno pull.....it renders cross comparing different runs on different dynos entirely useless. Even using a dyno for its intended purpose (response to modification) requires a certain level of attention to detail to even extrapolate useful data from the same car on the same dyno. A single “number” put out on a dyno can not be “good or bad”. It’s a baseline. Nothing more.

If you can’t except this it’s totally fine. But it’s not an opinion. It’s fact.

I think you're making it way more complicated than what it really is. Dude threw his car on a dyno and showed what the numbers were. Regardless of all these calculations etc etc, there is another ZL1 that was dynoed and made similar numbers. If it varied by 30 HP then that is one thing. But that isn't what we're seeing at all. And for the record, I could go on every drag strip thread and make the same comments about how DA and different cars and different drivers yada yada. See what I'm getting at? It isn't as drastic as you're making it out to be dude.

[kttxz06]

Originally Posted by BlaqWhole

I think you're making it way more complicated than what it really is. Dude threw his car on a dyno and showed what the numbers were. Regardless of all these calculations etc etc, there is another ZL1 that was dynoed and made similar numbers. If it varied by 30 HP then that is one thing. But that isn't what we're seeing at all. And for the record, I could go on every drag strip thread and make the same comments about how DA and different cars and different drivers yada yada. See what I'm getting at? It isn't as drastic as you're making it out to be dude.

Actually, the Zl1 I was referring to was actually 80 hp short than this one. His baseline was 531. A10. That is just nuts, but again, I agree that there is no perfect #. I did my baseline on that same dyno, but in the winter and got 568 hp so. You go by what your particular dyno put out and that's the way it is. I can go to 5 different dyno's on 5 different days and pull 5 different baselines. We all get that. I'm not sure that is being argued. Eh, whatever. I'm lost now. haha. Shit.

[ninetres]

3% variance between dynos is ABSOLUTELY not out of the question. So let’s assume hypothetically we know for a fact a car genuinely makes 550rwhp on a dyno (Dyno A) we know to be 100% accurate that 1.0whp=1.0whp.

Dyno B reads 3% higher= 566.5rwhp
Dyno C reads 3% lower= 533.5rwhp

Same car, 3 different results, only 3% off from the true output. THIS is why dynos are tools to measure change.....NOT to cross compare between dynos, cars, etc.

The variance exists whether it’s 1, 2, or 5%. So to see one single dyno graph and celebrate (or be bummed) because it’s a few HP higher/lower (or even identical) than another car on another dyno is silly. That’s all I’m saying.

[RDBill]

Black cars make the most power

[GT-ER]

Originally Posted by Vtor_ZL1

Is there really any merit to 1:1 trans gear ratio.. since there is still ratio in diff to account for.. so its NOT 1:1.

Not that I've ever seen. I've dyno'd dozens of cars, hundreds of times, and it never mattered what gear it was in as long as it was one of the "middle" gears (meaning 3rd or 4th in a 6 speed or 4th or 5th in an 8sp, etc). I've done the pulls, back to back, in different gears with no difference in power.

[collinms]

I installed a green filter today and I must say I was impressed by the increased airflow... I can actually hear it sucking in the air similar to the airaid intake I had on my gen 2 V. I have my ported TB on order and can't wait to test it.

[Stephen12ZL1]

it was a temperature controlled dyno cell with an airflow that mimics a 70mph highway cruise. This cell flows a lot of air as most dynos are in an open shop with two floor portable fans. I'm sure this dyno setup produced higher than average hp/tq because of the amazing amount of air this setup flows. Even with SAE correction factors this setup will most likely produce more hp/tq due to this huge airflow advantage.

[bigmike32172]

I'd imagine that it would be a good idea to use one of the majority of today's dyno shops to give you an over-exaggerated HP number on their sheet prior to selling the car to a private party.
After 25 in the 1/4 mile racing circuit, along with modding dozens of my vehicles it's always been quite frustrating receiving various HP readings on the same vehicle at different shops
If only someone would step in after all these decades to regulate the dyno industry so that they're all similar.

[Stefano]

Here is a Dyno Jet base line on my A10 ZL1. All stock. Hot and humid day and ZL1 was nice and warm.


http://m.youtube.com/watch?v=BXj7_I57qao

[Blown355]

Food for thought. My ZL1 A10 dyno'd 535/545 and trapped 128 mph in the 1/4.