Low horse power dyno numbers

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BettyBoop

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My '22 has a Yoshi AT2 full exhaust system, K&N air filter and iridium plugs. I bought it like this a couple weeks ago, it has about 9500 kms on it.. It hadn't been flashed yet so I went to my dyno guy and had the ecu flashed and dyno tuned. He couldn't get more than 164.84 horse power out of it, and has done a few other gen 3 before and told me they were around 165 to 170 stock. He didn't really have any idea why my bike was so low. I wasn't ready to have him tear it all apart to try and find out at that point.
Anybody got any ideas?
 
BettyBoop said:
My '22 has a Yoshi AT2 full exhaust system, K&N air filter and iridium plugs. I bought it like this a couple weeks ago, it has about 9500 kms on it.. It hadn't been flashed yet so I went to my dyno guy and had the ecu flashed and dyno tuned. He couldn't get more than 164.84 horse power out of it, and has done a few other gen 3 before and told me they were around 165 to 170 stock. He didn't really have any idea why my bike was so low. I wasn't ready to have him tear it all apart to try and find out at that point.
Anybody got any ideas?
Click to expand...
Every dyno is different. That is low number. That AT2 should do better. Id want to see the dyno graphs. How far is he revving it? Does it have velocity stacks? I am curious how good his tuning abilities are. Aside from the obvious with 9500 km on it have you cleaned the injectors? Did he change the throttle opening tables? So many variables here. You should definitely be over 170 hp.

 
Thanks, I will be having a full inspection done on it. My dyno guy is very good and is routinely used by many of the guys racing locally. He has worked on a few of my bikes in the past and has always managed to pull out good numbers.
The busa doesn't have the velocity stack mod done, I'm not sure I will do that, as I'm not really chasing horse power, just am surprised by the low number. Torque was 101.9, by the way.
 
This bike has low miles and should be on par with the other Gen 3 bikes he's tested....maybe his dyno had a brain fart during your run...your hp is far too low with a pipe and filter....they should net you around 10hp over stock.

You might be getting tire spin on the dyno especially if it is the original tire.
 
Yes the rear tire is pretty much gone and needs replacing for sure. Also it did look a bit melted at the end... I plan on replacing very soon, I can always get him to pop it on the dyno again for me. Thanks!
 
It’s low. When my stock 06 LE had around 30K on it I took it and my CBXs to a BMW dyno shop. The first two runs it measured 159.something. The final run managed a 160.something. Keep in mind that my LE is a Gen 1. The shop raced some of their bikes so I’m fairly certain the numbers on their dyno were good. The numbers for the Hondas were what I expected as well. I even tried a modded set of stock cans on the Busa and it got five HP less, even though it sounded quite good. Popped a bit on decel with the modded cans too.
 
Ked0607 said:
Every dyno is different. That is low number. That AT2 should do better. Id want to see the dyno graphs. How far is he revving it? Does it have velocity stacks? I am curious how good his tuning abilities are. Aside from the obvious with 9500 km on it have you cleaned the injectors? Did he change the throttle opening tables? So many variables here. You should definitely be over 170 hp.

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I know that guy!
 
SPECIALFORCESOFGOD said:
My money is on the spark plugs being the culprits.
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Iridium plugs with just 5,000 miles i really don't think so

these Gen3's make good low end power - it suits most riders on the street

but big horse power number - cams wont allow

here is a mapped/exhaust tuned de-restricted Gen3 making 186 hp versus my ZX14R 206hp on a dynostar and its not optimistic

if you want big power get another bike

i don't have the same overlay of my 1406cc busa with 208hp

zx14 v Gen3.jpg
 

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Bumblebee said:
Lots of variables in the real world....how the bike hooks up and puts the power down, the aggressiveness of the rider, etc, etc...

Even though stock Gen 1s put out less power than a Gen 2, there have been lots of instances where the Gen 1 will pull away.

Dyno numbers are numbers....
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Exactly. As an example, gyms have various weights. We can know how much we improve strength-wise from one stage to the next. That's how I see a dyno.

I have never compared dyno numbers. Makes no sense to me. I like how Chris Moore is constantly reminding people in videos that the dyno is a tool to measure how parts improve or worsen performance.
 
SPECIALFORCESOFGOD said:
Exactly. As an example, gyms have various weights. We can know how much we improve strength-wise from one stage to the next. That's how I see a dyno.

I have never compared dyno numbers. Makes no sense to me. I like how Chris Moore is constantly reminding people in videos that the dyno is a tool to measure how parts improve or worsen performance.
Click to expand...
Case in point, this guy on a fully set up H2 running something over 300 RWHP is getting trounced by a pro on a 400.....

Power is all relevant...

 
BettyBoop said:
My '22 has a Yoshi AT2 full exhaust system, K&N air filter and iridium plugs. I bought it like this a couple weeks ago, it has about 9500 kms on it.. It hadn't been flashed yet so I went to my dyno guy and had the ecu flashed and dyno tuned. He couldn't get more than 164.84 horse power out of it, and has done a few other gen 3 before and told me they were around 165 to 170 stock. He didn't really have any idea why my bike was so low. I wasn't ready to have him tear it all apart to try and find out at that point.
Anybody got any ideas?
Click to expand...

So I would get a new tire and slap it on there again. After fresh oil change too. make sure its in U1 with all rider aids turned off. if it slipped and TC was on it cut power.
 
Ked0607 said:
put that guy on the 400 on that H2 and he would run way slower too....
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Exactly....

There are times when people get lost on dyno numbers....

At one time in my fleet of bikes I had a Daytona RD 400 that would run circles around larger bikes and the riders would get frustrated because on paper, their bikes should have trounced me. It helped that I was racing superbike at the time and that experience gave me the edge.
 
Thanks everyone for the suggestions and advice, I'm not chasing numbers, was just surprised by the low horse power. I realize that the gen 3 doesn't put down high numbers, but it always has had more than enough for me. I primarily use this bike for street riding and occasionally week long touring, and it is perfect for this.
I do have another rear tire on order, and I'll have that installed in the next couple weeks. Bike is now just over 10,000 klms so should be due for service in a couple months (don't ride as much in winter...), I probably won't bother with doing another dyno run, as I agree, it's just a number, and the bike feels great anyway. This is my third busa and the gen 3 is a good bike!
 
You said the tire looked "melted"
That means too high psi and spinning, or more likely too low psi.
A new tire is very sticky, and can rob power on the dyno, and too low can do the same.
As the contact patch is bigger, generates more heat, and even an old and worn tire will get stickier.
You can easily lose 3-5+whp this way too.
Tire pressure is Very important to the ride quality And handling...and even on a dyno...yet so few people check it...
 
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