Dyno Dynamics to Dyno Jet comparison..
10-30-2007, 07:22 AM
#41
Originally Posted by MRC Motorsports
Dyna Pack? Those are actually really good fro tuning since they also are a true load based dyno. Thier numbers tend to be a bit high in most shops.I have seen a few that are right on par. There was one in XX tuning in CT that was dead on with a DJ, and I believe Turbo XS has one thats dead on,if not a bit lower..
That said, I just like the units because they don't require a permanent installation and the fact they do read from the hub makes them very accurate in repeated runs. So I used a dynapack for my baseline and I go back for all my repeated runs so I can track my cars torque curve. I don't care if they read low or high relative to other dynos, I go just so I can get repeatable, accurate measurements of the net change in torque through my power band.
10-30-2007, 07:50 AM
#42
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There's one thing that I don't understand.
If DynoJet is the industry standard... and it unquestionably produces the numbers that the would wants to compare/boast about... Why do several of the smartest builder/tuners use DynoDynamics dynos that everyone hates? Are DD's cheaper than DJ's?
It seems simple to me... use the dyno that produces the highest, most respected figures... So, there is obviously something that I/we are missing...
What is it?
If DynoJet is the industry standard... and it unquestionably produces the numbers that the would wants to compare/boast about... Why do several of the smartest builder/tuners use DynoDynamics dynos that everyone hates? Are DD's cheaper than DJ's?
It seems simple to me... use the dyno that produces the highest, most respected figures... So, there is obviously something that I/we are missing...
What is it?
10-30-2007, 07:55 AM
#44
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Originally Posted by __jb
There's one thing that I don't understand.
If DynoJet is the industry standard... and it unquestionably produces the numbers that the would wants to compare/boast about... Why do several of the smartest builder/tuners use DynoDynamics dynos that everyone hates? Are DD's cheaper than DJ's?
It seems simple to me... use the dyno that produces the highest, most respected figures... So, there is obviously something that I/we are missing...
What is it?
If DynoJet is the industry standard... and it unquestionably produces the numbers that the would wants to compare/boast about... Why do several of the smartest builder/tuners use DynoDynamics dynos that everyone hates? Are DD's cheaper than DJ's?
It seems simple to me... use the dyno that produces the highest, most respected figures... So, there is obviously something that I/we are missing...
What is it?
you are worrying to much ... dynojest have been industry std for a while for a reason... dynodynamics have some nice tools that help tuners get the right tune easier...that said, DJ tuners compensate that in other ways to get the tune right as well...
bottom line line they are both tools... and it doesn't matter what dyno a tuner uses for you to pick them to build your car... its about how good the tune is really... for power comparisons that different but thats it...
Originally Posted by Audible Mayhem
well dynojet has been the industry standard for years and years. there are absolutely no way of changing the corrections. it is what it is on a dynojet.
no values that are needed to be added in that you can "cheat" a little bit with the numbers on.(ex cars weight) you just strap it down and do a pull...
you dont ever see mcdonalds trying to compare their sandwiches to burger kings do ya...
no values that are needed to be added in that you can "cheat" a little bit with the numbers on.(ex cars weight) you just strap it down and do a pull...
you dont ever see mcdonalds trying to compare their sandwiches to burger kings do ya...
+1 and to avoid confusiong on location, weather..correction used... thats why you want a lot of poeple on supra forums post DJ uncorrected #s
Originally Posted by r0mey
so heres a question that person who is making 497 they are really making like 550 on a DJ?
i know...so weacksauce....lol... the person probably overkilled his setup too
[but at night he shows his true powers]
Last edited by IIQuickSilverII; 10-30-2007 at 07:59 AM.
10-30-2007, 08:03 AM
#45
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Originally Posted by __jb
There's one thing that I don't understand.
If DynoJet is the industry standard... and it unquestionably produces the numbers that the would wants to compare/boast about... Why do several of the smartest builder/tuners use DynoDynamics dynos that everyone hates?
If DynoJet is the industry standard... and it unquestionably produces the numbers that the would wants to compare/boast about... Why do several of the smartest builder/tuners use DynoDynamics dynos that everyone hates?
Originally Posted by __jb
Are DD's cheaper than DJ's?
Originally Posted by __jb
It seems simple to me... use the dyno that produces the highest, most respected figures...
Originally Posted by __jb
So, there is obviously something that I/we are missing...
What is it?
What is it?
If you look at most Dyno Jet dynos, youll see cars making power to 6700 rpms, now if you look at any DD dyno graph on the same car, its power will fall off alot sooner.Proof being on the first page of this thread with the same car comparison.
The reason is that on the "inertia" type roller dyno,it is doing exactly what its name emplies..Carrying its inertia until the operator applies the brake. On a Dyno Jet your spinning a several thousand Lbd. Roller,thus giving you a little "momentum" as you reach the upper RPM range.
10-30-2007, 08:07 AM
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Originally Posted by ForcefedZ
On the DJ you can select SAE, DIN, EEC, STD, JIS, or uncorrected. The uncorrected numbers are "uncorrected"
I was just wondering if the uncorrected DJ numbers matched the DD numbers. It seems like they are pretty close, my car did 600rwhp (uncorrected DJ) and trapped 132.
I guess it doesn't matter. I was just wondering since I have a DJ, and most of the tuners on this board have a DD.
Thanks for your input.
I was just wondering if the uncorrected DJ numbers matched the DD numbers. It seems like they are pretty close, my car did 600rwhp (uncorrected DJ) and trapped 132.
I guess it doesn't matter. I was just wondering since I have a DJ, and most of the tuners on this board have a DD.
Thanks for your input.
The big thing on the atmospheric correction is the BAROMETER, slight pressure changes in the atmosphere make pretty good differences in the dyno numbers.
If you made 600 on a DJ you woul make 13% lower on a DD dyno, no matter what.
10-30-2007, 08:09 AM
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Originally Posted by Audible Mayhem
you dont ever see mcdonalds trying to compare their sandwiches to burger kings do ya...
10-30-2007, 08:10 AM
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Originally Posted by r0mey
so heres a question that person who is making 497 they are really making like 550 on a DJ?
10-30-2007, 08:47 AM
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so, for example, if a car made 430hp on a Dynapack @ 11psi...it's numbers on either DD or DJ could be completely different depending on the correction factors entered in the DP? I was under the impression that DP locked out the operators ability to adjust those factors.
10-30-2007, 08:50 AM
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Originally Posted by SH Luciano
so, for example, if a car made 430hp on a Dynapack @ 11psi...it's numbers on either DD or DJ could be completely different depending on the correction factors entered in the DP? I was under the impression that DP locked out the operators ability to adjust those factors.
10-30-2007, 09:09 AM
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Originally Posted by MRC Motorsports
All the correction applies for is atmospheric conditions. If you give me an uncorrected DJ car's dyno and then we shut off our Atmospheric correction also, your car will still read lower on our dyno. Its all relevant.
The big thing on the atmospheric correction is the BAROMETER, slight pressure changes in the atmosphere make pretty good differences in the dyno numbers.
If you made 600 on a DJ you woul make 13% lower on a DD dyno, no matter what.
The big thing on the atmospheric correction is the BAROMETER, slight pressure changes in the atmosphere make pretty good differences in the dyno numbers.
If you made 600 on a DJ you woul make 13% lower on a DD dyno, no matter what.
When you select "uncorrected" on the DJ their is no correction added at all. The numbers that it gives you is the actual RWHP it took to accelerate the roller at that given rate. There is nothing you can do to change it, Altitude and temperature are not variable taken to compute the HP.
Last edited by Mike Wazowski; 06-20-2008 at 01:05 PM.
10-30-2007, 09:11 AM
#53
let me tell you that owning a dynojet, the uncorrected numbers will flucuate A LOT, depending on the weather and humidity. i always flip through the different corrections to see the difference.
you have to see the exact figures that STD and SAE are adjusted to. the closer you are to those numbers, the closer uncorrected will be.
you have to see the exact figures that STD and SAE are adjusted to. the closer you are to those numbers, the closer uncorrected will be.
10-30-2007, 09:14 AM
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Originally Posted by ForcefedZ
So 522rwhp on a DD will trap 132mph in a full weight Z?
When you select "uncorrected" on the DJ their is no correction added at all. The numbers that it gives you is the actual RWHP it took to accelerate the roller at that given rate. There is nothing you can do to change it, Altitude and temperature are not variable taken to compute the HP.
When you select "uncorrected" on the DJ their is no correction added at all. The numbers that it gives you is the actual RWHP it took to accelerate the roller at that given rate. There is nothing you can do to change it, Altitude and temperature are not variable taken to compute the HP.
.
10-30-2007, 09:32 AM
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Originally Posted by Audible Mayhem
let me tell you that owning a dynojet, the uncorrected numbers will flucuate A LOT, depending on the weather and humidity. i always flip through the different corrections to see the difference.
you have to see the exact figures that STD and SAE are adjusted to. the closer you are to those numbers, the closer uncorrected will be.
you have to see the exact figures that STD and SAE are adjusted to. the closer you are to those numbers, the closer uncorrected will be.
I agree that I see a big difference on my DJ with different weather condition when viewing in uncorrected. That should be expected hence the "correction" option to try to standardize the readings for different conditions.
I just don't think that it's really accurate to use hypothetical percentages to compare reading from one dyno to another. Even the readings from a DJ 248 to a DJ 224 will be different.
10-30-2007, 09:39 AM
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Originally Posted by MRC Motorsports
No.. 525 on a DD will trap 128 in a 3560lb Z with driver.
.
.
It would be interesting to see what I would "actually" dyno on a DD to compare the numbers.
10-30-2007, 09:41 AM
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Originally Posted by ForcefedZ
I was using your 13% less conversion applied to my DJ 600RWHP that trapped 132mph (600X.87=522)
It would be interesting to see what I would "actually" dyno on a DD to compare the numbers.
It would be interesting to see what I would "actually" dyno on a DD to compare the numbers.
10-30-2007, 09:42 AM
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Originally Posted by XKR
Julian...thanks for posting this, this really helps.
Someone posted over 600rwhp on a Dyno Max (the dyno where you have to remove the rear wheels, I think thats what its called) with a setup that would NOT get you 500rwhp on the DD. I did not know much about the DynoMax, so I asked for info......and some Moron (not the OP) acted like it was an insult for me to ask.
Thanks again Julian.....well needed info.
Edit*.....I stand corrected...Dyno Pack....thanks again !!
Someone posted over 600rwhp on a Dyno Max (the dyno where you have to remove the rear wheels, I think thats what its called) with a setup that would NOT get you 500rwhp on the DD. I did not know much about the DynoMax, so I asked for info......and some Moron (not the OP) acted like it was an insult for me to ask.
Thanks again Julian.....well needed info.
Edit*.....I stand corrected...Dyno Pack....thanks again !!
That was my car, i think. So, are you saying that 18psi greddy twins with cams wouldnt get you 500whp on a DD? not trying to be a smart*ss, just asking a question. anyway, i'll be heading to a local dynojet tomorrow to compare the dynapack numbers as compared to a dynojet. After that, i might even throw down on a dyno dynamics just to complete the trilogy
. i'll post up when i get back.
Last edited by Bullitproof; 10-30-2007 at 09:44 AM.
10-30-2007, 09:49 AM
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Originally Posted by MRC Motorsports
So come on down....
I'm sure you also being a shop owner know that it can be nearly impossible to get away from the shop. I am curious what the numbers would be. Maybe you can bring your dyno down here?
