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Old 08-23-2007, 10:58 PM   #1
skyline31
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Default Is Dynapack or Dynojet read higher??

I know this is a stupid question but Dynapack can adjust tcf to manipulate numbers.....what about Dynojet?? any ideas?? If we defualt Dynapack's tcf ratio to 1...will it read lower or hgher than Dynojet??
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Old 08-23-2007, 11:54 PM   #2
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Every dynapack I've ever been on or read about on the boards seems to read higher then just about any other dyno.
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Old 08-24-2007, 02:17 AM   #3
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a dyna pak dyno is user adjustable and the power reading cajn be changes bt the end user

DYNO JET dynos can not be adjusted - only the correction factor and smoothing are able to be adjusted by the end user
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Old 08-24-2007, 11:46 AM   #4
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Quote:
Originally Posted by brickhoss View Post
Every dynapack I've ever been on or read about on the boards seems to read higher then just about any other dyno.
Exactly
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Old 08-24-2007, 02:03 PM   #5
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Al. That is false. The dynojet can be adjusted.

To the OP... The Dynapak reads higher in most cases. The Trq reading on the dynapak reads alot higher. If it did not read higher I would be concerned. Your wheels and tires are sitting in a pile on the floor during the pulls. Those wheels and tires weigh 150 to 250lbs for the set depending on size and brand. Also the interface from the tire to the roller is gone. Next time you are around a Chassis dyno feel the tire after 5 pulls.. Its smokin hot. That heat is is friction and that engine made that friction.

The differences go higher and higher as power goes up. These two dynos are not that far off with stock turbo cars.. But if you start making 400 to 500whp the differences are huge.

Clark

Clark
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Old 08-24-2007, 02:57 PM   #6
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Quote:
Originally Posted by Dyno Flash View Post
a dyna pak dyno is user adjustable and the power reading cajn be changes bt the end user

DYNO JET dynos can not be adjusted - only the correction factor and smoothing are able to be adjusted by the end user
There are plenty of ways to fudge dynojet numbers just as is the case with just about any dyno out there. There are always internal corrections for elevation, standard conditions, etc that can be tweaked to make a dyno read higher/lower. Some shops have even resorted to pulling weights off the drums of a dynojet

People really need to get off the numbers game.

-- Ed
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Old 08-24-2007, 03:03 PM   #7
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Quote:
Originally Posted by Vaus View Post
There are plenty of ways to fudge dynojet numbers just as is the case with just about any dyno out there. There are always internal corrections for elevation, standard conditions, etc that can be tweaked to make a dyno read higher/lower. Some shops have even resorted to pulling weights off the drums of a dynojet

People really need to get off the numbers game.

-- Ed
Yea, personally, I don't understand why people enjoy getting off ultra-high reading dynos. Anytime you tell a person you have 330whp mustang dyno and they have 370whp dynojet dyno, you're in for a treat, and you have the upper hand without them knowing it.

Sadly, most car enthusiasts (at least here in the states, where everything is about show) can't deal with having second best, so they need something like numbers to inflate their _______.

I've noticed as soon as someone from out of the states (private consumer, not tuner) posts their numbers for their car, everyone jumps at them claiming it to be a bad tune/mechanical defect somewhere. Well, everywhere except PR cause those mofos are just crazy.

George
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Old 08-24-2007, 03:29 PM   #8
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Originally Posted by The Blue Pilot View Post
Sadly, most car enthusiasts (at least here in the states, where everything is about show) can't deal with having second best, so they need something like numbers to inflate their _______.

George
Exactly... part of the problem is that a lot of these people never actually drive or race their cars. The dyno sheet is all they want to make them happy so if the numbers are low, they can't be as happy. I find that the guys who do actually race their cars, usually actually appreciate lower numbers because it makes their 1/4 mile results that much more impressive

-- Ed
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Old 08-24-2007, 03:35 PM   #9
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Most customers could not tell the difference in 50whp. They just want a car that runs strong and smooth. The fruits of the money spent and the effort is a high reading dyno sheet.

Ed, Please dont tell Al how to turn up the dynojet...

Clark
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Old 08-24-2007, 03:39 PM   #10
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Quote:
Originally Posted by AZScoobie View Post
Most customers could not tell the difference in 50whp. They just want a car that runs strong and smooth. The fruits of the money spent and the effort is a high reading dyno sheet.

Ed, Please dont tell Al how to turn up the dynojet...

Clark
Hey guys lets play nice.

Thank you

-George
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Old 08-24-2007, 03:40 PM   #11
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Originally Posted by AZScoobie View Post
Al. That is false. The dynojet can be adjusted.

To the OP... The Dynapak reads higher in most cases. The Trq reading on the dynapak reads alot higher. If it did not read higher I would be concerned. Your wheels and tires are sitting in a pile on the floor during the pulls. Those wheels and tires weigh 150 to 250lbs for the set depending on size and brand. Also the interface from the tire to the roller is gone. Next time you are around a Chassis dyno feel the tire after 5 pulls.. Its smokin hot. That heat is is friction and that engine made that friction.

The differences go higher and higher as power goes up. These two dynos are not that far off with stock turbo cars.. But if you start making 400 to 500whp the differences are huge.

Clark

Clark
That's funny.. I made 333awhp and 411ft-lbs on TopSpeeds Dynojet and made 320 awhp and 378ft-lbs on PDP's dynapack.
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Old 08-24-2007, 03:46 PM   #12
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That's funny.. I made 333awhp and 411ft-lbs on TopSpeeds Dynojet and made 320 awhp and 378ft-lbs on PDP's dynapack.
That should tell you something about that dynojet
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Old 08-24-2007, 03:47 PM   #13
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Quote:
Originally Posted by Vaus View Post
That should tell you something about that dynojet


They are all just stupid numbers to me.
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Old 08-24-2007, 05:34 PM   #14
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They are all just stupid numbers to me.
Until you use them and beat someone with more numbers than you
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Old 08-24-2007, 05:43 PM   #15
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New rule: When posting a dyno plot in Proven Power Bragging, you are required to run you car in the quarter-mile and post your trap speed. Trap speed is a better indicator of your power then these crazy-different reading dynos.

oh wait, but elevation would screw that wouldn't it... Damn damn damn haha
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Old 08-24-2007, 05:54 PM   #16
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New rule: When posting a dyno plot in Proven Power Bragging, you are required to run you car in the quarter-mile and post your trap speed. Trap speed is a better indicator of your power then these crazy-different reading dynos.

oh wait, but elevation would screw that wouldn't it... Damn damn damn haha
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Old 08-24-2007, 06:08 PM   #17
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Originally Posted by The Blue Pilot View Post
Until you use them and beat someone with more numbers than you
If I raced at all, I think I would. I might as well have a 2.5i the way I drive
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Old 08-24-2007, 06:09 PM   #18
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Quote:
Originally Posted by brickhoss View Post
New rule: When posting a dyno plot in Proven Power Bragging, you are required to run you car in the quarter-mile and post your trap speed. Trap speed is a better indicator of your power then these crazy-different reading dynos.

oh wait, but elevation would screw that wouldn't it... Damn damn damn haha
There are elevation correction factors that will give you the MPH and time at sea level though...
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Old 08-24-2007, 06:15 PM   #19
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Quote:
Originally Posted by Vaus View Post
That should tell you something about that dynojet
zzzzzzzzzzziiinngggg!!

Let me go put a pack of popcorn in the microwave oven... this could get interesting
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Old 08-24-2007, 07:00 PM   #20
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Quote:
Originally Posted by AZScoobie View Post
Most customers could not tell the difference in 50whp. They just want a car that runs strong and smooth. The fruits of the money spent and the effort is a high reading dyno sheet.

Clark
There is a 42 whp (dynojet) difference in power between my 91 octane map and my ~97 octane race gas map. It feels like a night and day difference to me and most people who have ridden in my car. Maybe the other people just need to get their butt-dynos recalibrated
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Old 08-24-2007, 07:09 PM   #21
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There are elevation correction factors that will give you the MPH and time at sea level though...
huh... what's the point of doing an arbitrary correction like that?? If the car runs a certain MPH at a certain elevation, that's the power its actually making at that elevation. There's no correction required... its just conditions.

-- Ed
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Old 08-24-2007, 09:23 PM   #22
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huh... what's the point of doing an arbitrary correction like that?? If the car runs a certain MPH at a certain elevation, that's the power its actually making at that elevation. There's no correction required... its just conditions.

-- Ed
Ed, I completely understand what you mean, but as far as records and things go, is it fair to penalize someone over their location? It puts those at a higher elevation at a disadvantage, or those at sea level at an advantage, whichever way you wanna see it. A car capable of of a 13.1 quarter mile at 5,000 feet above sea level would be able to run a sub-13 second pass at sea level, see what I'm getting at?
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Old 08-24-2007, 09:32 PM   #23
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how about who cares?

a good shop will do a baseline, then will give you your dyno sheets with the gains overlayed. make sure you trust the shop not doing any stupid corrections like we are seeing posted... the proof is in the ass dyno.
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Old 08-24-2007, 11:02 PM   #24
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Ed, I completely understand what you mean, but as far as records and things go, is it fair to penalize someone over their location? It puts those at a higher elevation at a disadvantage, or those at sea level at an advantage, whichever way you wanna see it. A car capable of of a 13.1 quarter mile at 5,000 feet above sea level would be able to run a sub-13 second pass at sea level, see what I'm getting at?
Sure this is true. The problem is that any corrections that get applied are usually not realistic... this is especially true for turbo cars. If you tune a turbo car at 5000 feet and optimize it for that elevation, you can make up a lot of the disadvantage associated with the altitude. Apply a correction to that and you end up with unrealistic numbers. This is just the problem... any corrections for variable conditions just cannot be guaranteed to be realistic.

-- Ed
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Old 08-25-2007, 05:51 PM   #25
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I thought the dynojet would inflate the numbers, the lower the gear you used? That's why many people use 4th......put it in 5th and you get lower numbers.

FWIW, I was tuned at pdx in 5th. (dynapak)
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