Dyno Results Finally
Race Director
Joined: Mar 2007
Posts: 11,331
Likes: 18
From: Missouri City Texas
There is no rule of thumb for a conversion...it's based off of weather conditions and can result in your numbers being either higher or lower by minor or major amounts.
When I got my car dynotuned my ACTUAL numbers were about 14rwhp higher than SAE because we have awesome weather in houston in the winter
Safety Car
Joined: Jun 1999
Posts: 3,570
Likes: 3
From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
The SAE correction allows you compare dyno results when weather conditions are different. SAE numbers are the standard and all dyno's will give you this option. Don't even look at anything else.
This will help you understand it.
http://wahiduddin.net/calc/calc_cf.htm
Track Junky
Joined: Jun 2007
Posts: 4,074
Likes: 36
From: Orlando Area
Tech Contributor
I understand the theory behind SAE numbers but I'm not sure if the numbers on my graph are oficially SAE or not. I do know that the Mustang dyno that HPS uses takes weather dart into account. They have a box mounted to the wall next to the computer that inputs ambient temp, humidity, pressure, etc into the Hp and Tq calculation. Based on that, I would tend to think the numbers I got were SAE corrected.
Track Junky
Joined: Jun 2007
Posts: 4,074
Likes: 36
From: Orlando Area
Tech Contributor
If it helps, the temp was 91 F and very humid that day... ( Miami / Ft. Lauderdale area). If my numbers are not SAE corrected, they would read slightly higher.
Hope this clears up any confusion to any of my previous posts.
Hope this clears up any confusion to any of my previous posts.
Track Junky
Joined: Jun 2007
Posts: 4,074
Likes: 36
From: Orlando Area
Tech Contributor
You guys sparked my interest in this so I looked up the almanac weather data for the zipcode I was in that day. Running the numbers through SAE correction calculator, my correction factor is 1.027.
Variables as follows:
Temp 86
Humidity 87
Air Press 29.97
Vapor press 1.087
This would give the following results:
474.5 Hp
442.6 Tq
This is assuming that the dyno I was on didn't take this into account. These results are, in fact, more inline with what others have seen with the same mods.
Food for thought.
Sean
Variables as follows:
Temp 86
Humidity 87
Air Press 29.97
Vapor press 1.087
This would give the following results:
474.5 Hp
442.6 Tq
This is assuming that the dyno I was on didn't take this into account. These results are, in fact, more inline with what others have seen with the same mods.
Food for thought.
Sean
Last edited by taken19; May 16, 2011 at 11:29 AM.
Track Junky
Joined: Jun 2007
Posts: 4,074
Likes: 36
From: Orlando Area
Tech Contributor
Floyd, you are absolutely right and I want to appologize to 3holer for that. He and I have been very closely following each other's builds along the way and have produced similar results. I figured I would keep this info here in case he didn't have SAE numbers either so he could get more accurate results.
His numbers came in a bit lower than he was hoping for and this may be a contributor to it. Didn't mean to take this thread over...
His numbers came in a bit lower than he was hoping for and this may be a contributor to it. Didn't mean to take this thread over...
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Intermediate
Joined: Jan 2009
Posts: 35
Likes: 0
From: Moore OK
Shop just called to say they were done on the dyno. She netted 451RWHP on a Dynojet and was just over 400 ft. lbs torque. I was hoping for the 460-470 range but overall I realize the x-tra $2k I decided not to spend is what most likely kept me from the higher numbers. Once I have the graph I'll post...
2007 M6 Z51 Vert
Kooks 1 3/4" headers w/catted x-pipe
Blackwing CAI
Livernois ported 243's
Spin's 230xfi cam
Katech chain
SLP 25% UD
Peak speed ported IM and TB
2007 M6 Z51 Vert
Kooks 1 3/4" headers w/catted x-pipe
Blackwing CAI
Livernois ported 243's
Spin's 230xfi cam
Katech chain
SLP 25% UD
Peak speed ported IM and TB
Thread Starter
Instructor
Joined: Oct 2010
Posts: 100
Likes: 0
From: Michigan
Floyd, you are absolutely right and I want to appologize to 3holer for that. He and I have been very closely following each other's builds along the way and have produced similar results. I figured I would keep this info here in case he didn't have SAE numbers either so he could get more accurate results.
His numbers came in a bit lower than he was hoping for and this may be a contributor to it. Didn't mean to take this thread over...
His numbers came in a bit lower than he was hoping for and this may be a contributor to it. Didn't mean to take this thread over...
Others can view the information we've provided and know that with the mods we've made, numbers in the 440-470 range are attainable and both builds are backed up with dyno results.
Race Director
Joined: Mar 2007
Posts: 11,331
Likes: 18
From: Missouri City Texas
No apology necessary Sean. It's been a joy to be able to exchange info back and forth with builds so closely resembling each other. The roughly 10-20hp difference we have could be attributed to any number of things. Like I said before, I wasn't trying to beat or compete with anyone's prior results just had an optimistic (unrealistic or not) feeling on the numbers I may have seen. I don't consider 451RWHP to be low...
Others can view the information we've provided and know that with the mods we've made, numbers in the 440-470 range are attainable and both builds are backed up with dyno results.
Others can view the information we've provided and know that with the mods we've made, numbers in the 440-470 range are attainable and both builds are backed up with dyno results.
You cannot explain the 10-20hp difference because you don't know what the difference actually is. Your car could be 10-20 higher, 10-20 lower, the same, etc...