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Old 07-20-2009, 10:29 AM   #1
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Suprised by Different Dyno's

I recently went and had my bike tuned at a reputable shop in town, and I have to say that I was really suprised by the difference in HP numbers between it's shop and another reputable one in Houston that I had a HP ran at about a month ago (sorry for no names, don't want to step on toes).

The only modifications that were done in between the pulls was the PAIR and flapper mod to get ready for the dyno. The flapper mod might yield one HP at top (on a good day).

Anyways, the first run stated 127 BHP max while the more recent one after the tune was 113 BHP. I know that different dyno's give different numbers, but are you guys familiar with this much difference?? To me, a 10% difference is pretty large.

I'm not stuck on the numbers as I'm happy with the way my bike performs, but I just wanted to get your opinions. Also, this is just some hard numbers for everyone who has ever said that different dyno's can yield different numbers.
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Old 07-20-2009, 10:31 AM   #2
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Small things can make big differences. Weather, relative humidity, and tire pressure are perfect examples.
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Old 07-20-2009, 10:33 AM   #3
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air temp, tire pressure, multiple other variables can change things. i'm curious tho. thats a big difference.
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Old 07-20-2009, 10:35 AM   #4
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10 percent isn't that big of a difference in dynos
thats probably right.
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Old 07-20-2009, 10:42 AM   #5
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Yeah, the last pull of the day, it was 100 degrees in the box (was there when he did it). The humidity was still pretty low, so it was warm but not scorching hot like it would be outside.
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Old 07-20-2009, 10:42 AM   #6
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929's typically dynoed just under 130hp with factory head pipe. So if this is the case your first dyno run was pretty accurate.
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Old 07-20-2009, 10:49 AM   #7
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That sounds like a bit of difference. Were they the same brand dynamometer?
I've heard Mustang dynos compared to Dynojet, Mustang is around 10-12% less.

+1 for dyno readings being very conditional though.
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Old 07-20-2009, 10:53 AM   #8
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Yeah, I was really hoping that my dyno would be somewhere around 135 with my mods since others have had about the same.

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Old 07-20-2009, 10:59 AM   #9
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all dynos are going to give you different numbers. I would use one shop just to be consistant. Wheather plays a big role also.
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Old 07-20-2009, 11:02 AM   #10
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#1 the actual numbers you get mean diddly squat.

#2 each dyno and operator can manipulate the numbers

#3 different dyno's give different types of numbers


The important thing to remember is that if you want reliable information you have to use the same tuner/ same dyno. Otherwise you're wasting your time worrying about what your results are.

Finding a person who is truly talented at tuning with a dyno is really tough, I'm very, very happy with my guy- you should be too.

Any idiot can get on a dyno and start changing things

Find a reputable tuner and use them exclusively, then you can start making changes to your bike and get reliable information. Changing tuners/ dynos isn't going to give you reliable information.
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Old 07-20-2009, 11:05 AM   #11
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Quote:
Originally Posted by BigMike0147 View Post
Yeah, I was really hoping that my dyno would be somewhere around 135 with my mods since others have had about the same.

Full Arata
BMC Filter
PC3
Flapper and PAIR mods
Since you have a full system you will read 135-138 come winter on that same dyno. Going by the trap speed numbers from summer and winter on my zx14, there is a 15hp loss in the hot weather.
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Old 07-20-2009, 11:38 AM   #12
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You really need to use the same dyno to be able to compare them. Every dyno is a little different.
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Old 07-21-2009, 07:07 AM   #13
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Quote:
Originally Posted by tomLSTD View Post
#1 the actual numbers you get mean diddly squat.

#2 each dyno and operator can manipulate the numbers

#3 different dyno's give different types of numbers


The important thing to remember is that if you want reliable information you have to use the same tuner/ same dyno. Otherwise you're wasting your time worrying about what your results are.

Finding a person who is truly talented at tuning with a dyno is really tough, I'm very, very happy with my guy- you should be too.

Any idiot can get on a dyno and start changing things

Find a reputable tuner and use them exclusively, then you can start making changes to your bike and get reliable information. Changing tuners/ dynos isn't going to give you reliable information.
I agree. A dyno is a tuning tool, and only a tuning tool.
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Old 07-21-2009, 08:10 AM   #14
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Like everyone mentioned:

Every dyno is different. Dynojet is most common, mustang is the heartbreaker, dyno dynamics..meh. Stick to the first dyno you used. Weather conditions will play role too.
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Old 07-21-2009, 10:45 AM   #15
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Most common bike dynos are Dynojets(DJ250i is the preferred), Superflow, Factory Pro EC997a. Both the Superflow and Factory Pro will read lower then the DJ just to start....Then once you get into correction factors, smoothing, dyno room setup (fans, ventilation, ambient/humidity etc) and ofcourse all the other mechanical factors, you can have huge discrepencies when dynoing..... a low rear tire can cost you 2-3hp alone.

Dynojet numbers are the most common, most used in the media etc so I try to stick with those. Tejas Motorsports has a DJ250i thats real honest and I feel pretty accurate. Johnny Cheese's DJ250i will read within 2-3hp of Tejas' on average. I try to stick with either of those two for measurment/bragging purposes....For actual tuning, any dyno with a Eddy Current brake(load brake) and a GOOD sniffer with a competent tuner will work. Andy at Metric Cycles has a great dyno room setup, Andy is great at tuning and his dyno is a true load brake dyno, all of these equal a great tune.....BUT his Superflow software will give you low #s.....Doesn't matter though....dyno there for the baseline, then measure the gains after tuning....

GAINS = GAINS..... Plain and simple.
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Old 07-21-2009, 12:56 PM   #16
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Quote:
Originally Posted by ZXALAN View Post
Andy at Metric Cycles has a great dyno room setup, Andy is great at tuning and his dyno is a true load brake dyno, all of these equal a great tune.....BUT his Superflow software will give you low #s.....Doesn't matter though....dyno there for the baseline, then measure the gains after tuning....

GAINS = GAINS..... Plain and simple.
No doubt here Alan, his dyno doesn't do anything for the phallice...


He'll do the "conversion" for you if you like.
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Old 07-21-2009, 01:11 PM   #17
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Thanks guys for all of the responses.

I'm not worried about how these dyno numbers are low, and just wanted to throw my experience out there so you can say "I know for a fact that someone on MH had a difference of over 10% due to different dynos/conditions".

The bike was done well. I brought it back yesterday, and it feels quite a bit smoother. Roads were a little wet in spots, so I didn't really put it through the paces. That will be this weekend if it is dry.
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Old 07-21-2009, 01:48 PM   #18
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Quote:
Originally Posted by BigMike0147 View Post
Thanks guys for all of the responses.

I'm not worried about how these dyno numbers are low, and just wanted to throw my experience out there so you can say "I know for a fact that someone on MH had a difference of over 10% due to different dynos/conditions".

The bike was done well. I brought it back yesterday, and it feels quite a bit smoother. Roads were a little wet in spots, so I didn't really put it through the paces. That will be this weekend if it is dry.
A healthly stock 929 should dyno anywhere from 120-135hp stock I would imagine....you will likely gain 8-10rwhp from a good full system and custom map by a good tuner. So I could see you landing anywhere from 130-140rwhp....Those are realistic numbers for a Dynojet dyno. On a Eddy current style dyno like a Factory Pro or Superflow, it will likely be less.

I once dynoed a well broken in ZX11, we put a full Muzzy on it and re-jetted the carbs, the tuner at the time actually pulled the carbs off 6 times to get them exactly right....on his Factory Pro EC997a, it only made 126rwhp. I was like "WTF?" He didn't dyno it before he put the pipe on so we didn't know the gain.....those bikes were rated at 130-135hp from the factory.....needless to say I was off. But that bike would trap 133-134mph in the 1/4 which was pretty good for its weight vs hp. That was my first lesson in how dynos can you off, yet your bike runs great. I wish I would have thrown it on a properly calibrated DJ150 or 200(thats all there was back then) and seen what it would make....I was expecting 140rwhp.
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Old 07-23-2009, 08:28 AM   #19
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Quote:
Originally Posted by ZXALAN View Post
A healthly stock 929 should dyno anywhere from 120-135hp stock I would imagine....you will likely gain 8-10rwhp from a good full system and custom map by a good tuner. So I could see you landing anywhere from 130-140rwhp....Those are realistic numbers for a Dynojet dyno. On a Eddy current style dyno like a Factory Pro or Superflow, it will likely be less.
Man, first those estimated numbers seem aweful high from a 929. Those bikes were not exactly powerful... with a tune and the parts listed, I would expect about 130hp personally. 140hp is reaching the numbers of a later model GSXR1000, and the 929 was nowhere near that power iirc.

A lot of tuners will argue that the eddy current dyno gives "true" hp, not the "corrected" hp of the others; but that's another thread/ subject.
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Old 07-23-2009, 08:46 AM   #20
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If the opprotunity ever arises to put my bike back on the other dynojet for a fair price, then I'll probably do that to see if anything has changed. Before the custom map, flapper, and PAIR mod it was 127 hp on the dynojet. So if I picked up a couple then, that would be nice.

On the fireblade forums I'm on, a stock 929 should be somewhere around 125 hp (from others numbers). I think that the numbers up top are getting mixed. However you cut it, I think my bike should be about 20-30 hp behind a GSXR1000 from the factory.
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