L99 W/ Vortech & 3.33" Pulley - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Mike@RMCR · 03-22-2010, 06:37 PM

Here is the graph for the last L99 we did with a Vortech Supercharger, 3.33" SC Pulley, ARH Headers w/ Cats, Magnaflow exhaust. 9.5lbs of boost.

Now for the math.

The DA for today is 8681 feet. The dyno correction for these runs were 27%

Using the general rule of of 2.9% for every 1000 feet. This puts the correction at 8681 / 1000 = 8.681 x 2.9 = 25.16

So this puts it at 25%. This leaves me within 2% which is well within the Dynojet Specs.

I have also checked the DA since the last car we posted. It has never been lower than 7500 feet. Checking with Superflow who is local and several other shops. This is the norm. It fluctuates from 6800 feet to over 10000 feet depending on the day.

Hope this helps with the confusion.

Brian@Vortech · 03-22-2010, 07:12 PM

Great work guys! That curve looks fantastic!

racerx333 · 03-22-2010, 07:44 PM

mike

is mine done yet????!!!!
just kidding

car looked great when we were there, see ya in a few weeks

Roger Ramjet · 03-22-2010, 08:33 PM

It's not a good idea to use density altitude to correct observed HP numbers. The SAE HP correction equation treats temperature differently than the DA equation.
- SAE is the square root of the temperature ratio.
- DA is just the ratio.

The reference points are also different.
- 59F, 0% RH, and 29.92 baro pressure for the DA.
- 77F, 0% RH, and 29.235 baro pressure for the SAE.

In addition, the SAE correction equation has an imperical slope adjustment for extremely good or bad conditions like you have (was 1.18 but more recently changed to 1.177).

Bottom line, use and believe the SAE correction method.

mtcwby · 03-22-2010, 10:26 PM

Quote:

Originally Posted by Roger Ramjet

It's not a good idea to use density altitude to correct observed HP numbers. The SAE HP correction equation treats temperature differently than the DA equation.
- SAE is the square root of the temperature ratio.
- DA is just the ratio.

The reference points are also different.
- 59F, 0% RH, and 29.92 baro pressure for the DA.
- 77F, 0% RH, and 29.235 baro pressure for the SAE.

In addition, the SAE correction equation has an imperical slope adjustment for extremely good or bad conditions like you have (was 1.18 but more recently changed to 1.177).

Bottom line, use and believe the SAE correction method.

RMCR does use the SAE correction that is built into their Dynojet. Mike was just trying to make a point to other members that are always screaming BS to the fact that the SAE correction numbers on the dyno in Colorado Springs are always corrected to 1.25-1.29. Some people who only deal with sea level numbers just can't seem to understand just how much the altitude effects the correction numbers.

By the way, great job Mike and Mark.

Mike@RMCR · 03-22-2010, 11:35 PM

I was only showing how DynoJet told me to verify if the machine was reading correctly. I have never questioned our SAE #'s.

This car will be at the 1st test & tune at Bandimeer. Will post some times when we get it.

BLWN SS · 03-22-2010, 11:35 PM

Thanks guys, the car feels fast,the whine is just right! Put 40 miles on the car on the way home which is 10 from your shop. Be back next week for the suspension work!

Mike@RMCR · 03-22-2010, 11:37 PM

Glad your loving the car. Will give ya a call when we get all the suspension pieces in.

JANNETTYRACING · 03-23-2010, 10:27 AM

Nice Job Mike, have to love those Vortechs, they are impressing us daily.

Mike@RMCR · 03-23-2010, 11:39 AM

Thanks, I agree this is by far one of Vortechs best supercharger kits they have ever made.

The power that there new Si Trim is capable of is very impressive.

03-22-2010, 06:37 PM	#1
Mike@RMCR Drives: Supercharged Join Date: Oct 2009 Location: Colorado Springs Posts: 314	L99 W/ Vortech & 3.33" Pulley Here is the graph for the last L99 we did with a Vortech Supercharger, 3.33" SC Pulley, ARH Headers w/ Cats, Magnaflow exhaust. 9.5lbs of boost. Now for the math. The DA for today is 8681 feet. The dyno correction for these runs were 27% Using the general rule of of 2.9% for every 1000 feet. This puts the correction at 8681 / 1000 = 8.681 x 2.9 = 25.16 So this puts it at 25%. This leaves me within 2% which is well within the Dynojet Specs. I have also checked the DA since the last car we posted. It has never been lower than 7500 feet. Checking with Superflow who is local and several other shops. This is the norm. It fluctuates from 6800 feet to over 10000 feet depending on the day. Hope this helps with the confusion.

03-22-2010, 07:44 PM	#3
racerx333 NAPA GENERAL Drives: 2010 2ssrs ry ls3 02 ss slp Join Date: Jun 2009 Location: colorado Posts: 47	mike is mine done yet????!!!! just kidding car looked great when we were there, see ya in a few weeks __________________ RMCR CUSTOM HOTROD 684RWHP!

03-22-2010, 08:33 PM	#4
Roger Ramjet Motor Head Drives: CTS-V Join Date: Feb 2009 Location: So MD Posts: 494	It's not a good idea to use density altitude to correct observed HP numbers. The SAE HP correction equation treats temperature differently than the DA equation. - SAE is the square root of the temperature ratio. - DA is just the ratio. The reference points are also different. - 59F, 0% RH, and 29.92 baro pressure for the DA. - 77F, 0% RH, and 29.235 baro pressure for the SAE. In addition, the SAE correction equation has an imperical slope adjustment for extremely good or bad conditions like you have (was 1.18 but more recently changed to 1.177). Bottom line, use and believe the SAE correction method. __________________ History Camaro's: 83, 93, 95, 98, & 10. Last edited by Roger Ramjet; 03-22-2010 at 09:21 PM.

03-23-2010, 10:27 AM	#9
JANNETTYRACING Drives: BLUE CAMARO ZL1 1LE M6 Join Date: Jun 2009 Location: ON THE DYNO WATERBURY CT. Posts: 15,427	Nice Job Mike, have to love those Vortechs, they are impressing us daily. __________________ www.jannettyracing.com Celebrating 39 years Performance parts, Installation, Fabrication, Dyno tuning, Remote custom tuning, and alignments. 203-753-7223 Waterbury CT. 06705 email tedj@jannettyracing.com

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Mike@RMCR Drives: Supercharged Join Date: Oct 2009 Location: Colorado Springs Posts: 314	I was only showing how DynoJet told me to verify if the machine was reading correctly. I have never questioned our SAE #'s. This car will be at the 1st test & tune at Bandimeer. Will post some times when we get it.

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Mike@RMCR Drives: Supercharged Join Date: Oct 2009 Location: Colorado Springs Posts: 314	Glad your loving the car. Will give ya a call when we get all the suspension pieces in.

03-23-2010, 11:39 AM	#10
Mike@RMCR Drives: Supercharged Join Date: Oct 2009 Location: Colorado Springs Posts: 314	Thanks, I agree this is by far one of Vortechs best supercharger kits they have ever made. The power that there new Si Trim is capable of is very impressive.