05-09-2022, 01:00 PM | #15 |
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http://www.wallaceracing.com/Calcula...or%20Speed.php
And granted, there's most likely more to consider but essentially a Dyno is just making the calculations for you. The key is consistent numbers. |
05-09-2022, 06:25 PM | #16 | |
Drives: 2017 Chevrolet Camaro ZL1 Join Date: Jul 2018
Location: Canton, GA
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Quote:
That said, we gained several MPH and shaved several tenths from my car from the first time it hit the track (same weight). Put it back on the dyno after a few months and it still made the same in a single 6th gear pull… So there are other variables to even just using trap speed. Best bet is to just use it as a tuning tool to compare changes against a base run. :-)
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2017 ZL1 - PB 8.05 @ 172 MPH @ 3730 lbs @ 70 DA (work in progress)
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05-09-2022, 10:36 PM | #17 |
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Drives: 2017 Camaro ZL1 A10 Join Date: May 2012
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Well 7th gear isn't exactly 1:1...it's just the gear that is closest to 1:1. As arpad said, 7th gear on a dyno puts you over 200 MPH. These dynos are rated up to 200 MPH. So there could be some questioning of the accuracy of the readings when going over that speed. On top of that a lot of shops just don't feel comfortable spinning the dyno that fast in case something breaks. Many of them won't go that high. So they stay in 6th. Typically 6th reads about 20 RWHP lower than 7th.
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05-10-2022, 04:04 PM | #18 |
Drives: 22 ZL1 1LE A10 Join Date: Feb 2022
Location: Ohio
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Here I can officially join…
585hp, 581tq MBRP race CBE Rotofab CAI 6th gear SAE Dynojet |
05-10-2022, 04:05 PM | #19 | |
Drives: 22 ZL1 1LE A10 Join Date: Feb 2022
Location: Ohio
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05-10-2022, 06:41 PM | #20 |
Drives: like an old lady Join Date: Jun 2012
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this is blasphemy. real world results? but how would we argue over 10-20 hp if we weren't comparing a million different cars on different dynos? but the dyno said it made an extra 12 hp, its definitely a worthwhile mod, idk why it runs the same. must be the weather.
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05-10-2022, 07:02 PM | #21 | |
Drives: 2020 Camaro ZL1 Join Date: Oct 2020
Location: Fort Worth, Texas
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Quote:
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2020 ZL1 A10 Shadow Gray Metallic
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05-10-2022, 07:46 PM | #22 | |
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I think a good rule of thumb would be to factor in a +/- range to account for errors and variances and other BS. So if you're making, as an example, 750, then it should be a range instead of a hard set number. So 750 should be more like approx 735-765 given the same type of dyno and similar conditions. And really, it is just splitting hairs when you're comparing a 760 RWHP dyno run to a 740 RWHP dyno run. When factoring in a range, any given day a 740 RWHP car can beat a 760 RWHP car. It seems to be a good starting and stopping range. I also think at those speeds, once you get to 120-130, you're pretty much not gonna stay in it. And if you're ahead of the person at 120 chances are they won't catch up given you didn't just get a lucky jump. In some cases there have been GTs and GT guys with mods who have been able to keep up with or even get the edge on stock ZL1s to about 120-ish...at which point the ZL1 just barrels past them. But I would think that 60 to 130 is the best range to determine which car is faster. And with Dragy boxes it is becoming the standard test. |
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05-11-2022, 06:53 AM | #23 |
Drives: 2017 Camaro SS 50th Anniversary Join Date: Apr 2021
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Testing 60-130 you are much less traction limited too, so measurements can be more accurate on higher hp builds w/o factoring tire slip.
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