Dyno Results today - low defective R77 ?

[gpman]

Any help from the Tech Guru's ???

I picked up my K8 from the Dynojet shop, the results are low, the tech said it is because the R77 is too restrictive, the Core is too narrow. The Yoshimura website shows the pipe can make up to 183 Max HP and 104 Max Torque.

He said everything is corrected and operating properly ( I installed the R77 Exhaust and PC III, Dynojet tech installed the BMC AF and performed the pair valve mod).

I sent an email to Yoshimura support just in case it is a defective pipe as there is a "whistling" sound from the exhaust. :umm:

[Pinky]

it looks like it needs richened up a bit around where the peak hp is

[Nakedbusa]

The whistling sound is from the hole where the screw goes when you install the silencing core. Put a little rubber stopper in there and it will go away.

Yosh pipes are some of the lowest hp producing of the systems.

[gpman]

Thanks for the tips, I will see if that stops the whistling noise. What accounts for the large gap in HP compared to what they show on the Yosh website for the R77?

I know alot of Busa riders are buying this pipe and would like to know what kind of performance to expect. I do want a fairly quiet pipe so I am not expecting real high HP, just want to know why such a difference in what they are advertising.

[Nukedog]

Thanks for the tips, I will see if that stops the whistling noise. What accounts for the large gap in HP compared to what they show on the Yosh website for the R77?

I know alot of Busa riders are buying this pipe and would like to know what kind of performance to expect. I do want a fairly quiet pipe so I am not expecting real high HP, just want to know why such a difference in what they are advertising.


Every dyno reads different. Every day the same dyno may read different than the next day. Dyno's can be manipulated very easily...

[V8Pinto]

Every dyno is different, don't get hung up on the numbers.

It's lean in the mid-top range. It should be richer than that to account for the ram air effect.

[Loki08]

The best way to measure gains is at the track. Static dynos don't tell the whole story.

[Tybalt]

We can dyno your hayabusa where you are at and then for example dyno your K8 up here in the fresher northern air and we still are going to have different results. i dont pay much attention to dyno #'s,I just like to see how my A/F is doing.

[busakid]

Yeah agree Ty - also you bought the Yoshi cos it was one of the quieter systems around, like me - I have been riding on 3points (thats 1 ticket away from ban) for 3 years now and I bought the Yosh for the purpose of a little more performance, wieght loss (heaps!!!) and a nicer sound. If I really wanted to chase HP I would have bought a very different system. Plus; never EVER believe what a manufacture tells you about thier product its usually inflated to teh best scenario!

BK

[Nakedbusa]

A company like Yosh will get bikes before they are made public so they can have product on the floor when the bike hits. They will give them bikes that were hand built just for big numbers.

I know the bike that 2 bros had for the new carbon mufflers was had from Suzuki direct. then they went and crashed it just befor laguna and the unveiling and they had to make it work still. They built "Rodan". They sold the bike to a guy I know and when Suzuki found out they freaked out.They tried everything to get it back. My buddy still has it. One day he will take it apart and see what they didnt want in the publics hands. Its also the same bike all the mags had to do a sales pitch on numbers.

Dont worry about numbers, ride the shit out of it and have a ball.

[gpman]

I was just suprised the numbers were that low, thinking maybe something was wrong with the install of the pipe or the PC or something else, but the tech said everything was installed correctly.

The bike had 796 miles on it when I left it for tuning, it had 838 miles when I picked it up, one of the dynojet techs had a K8 black and orange like mine and he still has the stock exhaust on, said he is waiting on the Brocks AH for his bike. I know it makes more power but it's way too loud for me.

The bike still runs great so no problem there, now that the dyno is finished I will take everyones advice and not worry about the numbers and get to riding!!!:oh yeah:

[Mpeavler]

My 08 w/ Tiforce full system w/single can made 184 /109 with stock filter/bazzaz box at Schnitz racing at 713 miles BUT...as everyone has already mentioned to ya....numbers are just numbers...they don't represent how strong your bike is. You need to measure it via track, roll on race with someone etc that way you can tell. My 2000 busa only pulled 155 stock at the wheel but outran MANY other busas that made 10hp more on other dynos. Each dyno reads different...and yours could have pullled 190+ on the dyno I used...so don't get wrapped up in that....it's only a tunning method anyways!!

A/F is what you want....everything else is numbers!


Mike

[gpman]

I just received this email response from Yoshimura Sales in response to my questions about the difference in the Dyno results compared to the results posted on thier website:


"We looked at the Dynograph you provided, but we have no baseline to do any comparative data.

The graph we provide is meant to be a tool to indicate gains/losses between configurations, and not for actual comparison of horsepower or torque values. The variances between dynamometers, operating conditions (air temperature, humidity, barometric pressure) and even operators can have a significant affect on the actual values, as much as 10hp between runs. However, the pertinent information, that is the differences between curves, will always remain constant. Dyno’s will also vary from manufacture to manufacture, i.e. our Superflow dyno makes on average 10% less power than what our Dynojet makes. This difference is due to the correction factors for each dyno as well as the data acquisition methods.

Furthermore, our testing is done with no changes other than the exhaust itself. In order to maintain consistency in testing, no fueling or ignition modifications have been made. Any type of fueling or ignition improvements will greatly affect the power band as well as improve ride-ability.

I hope this helps to clear things up a bit. Please let me know if you have any further questions."

Yoshimura Sales

[Mpeavler]

Here is mine....and once it get's a few more miles on it, hopefully will gain 1-2 more. I seen the stacks give 2-3 and the filter 1-2 so ...

[Cali Badazz !!!]

their reply says it all..without your baseline run there is no way to know how much your bike gained over stock. thats dyno tune 101..baseline run then with 1 mod at a time to chart increased hp! your sytem could have given you 20 hp over stock but how will you know? forget what any other bike makes. you wanna know how much hp you got 4 your money right? newy nakedbusa is right the pipe shipped with a rubber plug for the bolt hole. sounds like you found some rookie tuners

[steelernation]

Dont forget you are still riding th fastest production bike in the world

[gpman]

Tuner was pretty negative on the Yosh pipes from the start, he definitely is a seasoned tuner, maybe too seasoned & knows how to play a customer for more $$$. I don't really think that is the case but I did not ask if a baseline run would have been done automatically so I could see the gains. Probably had to pay extra for that or is it standard procedure for tuners to provide the baseline run?

He also said I could purchase a Dynojet multihub and run two maps (I would have to pay for the second map) one with the R77 Core in and one with the Core out for more HP.

I probably should have bought the Bazzaz fi, I believe it already supports two maps with no additional modules required.

Oh well, lessons learned, we are going for a long ride tomorrow just to enjoy the bike, only need 100 more miles to hit 1000.

This bike really hauls ass, my K5 Gixxer 1000 is fast but it's so light it feels like a 10 speed bike going superfast compared to the K8 Busa, which feels like a freight train with a rocket booster attached !!!
:surprise:

[Mpeavler]

well if you it makes you feel better....a friend just dyno his K8 and stock it only pulled 161.4 w/ 1400 miles on it. This was thd base run stock....but that's pretty darn low on a dyno that usually reads on the "higher" side!!

Mike

[Quasar]

Every dyno is different, don't get hung up on the numbers.

It's lean in the mid-top range. It should be richer than that to account for the ram air effect.

Yes, even without the additional RAM-Air, it's already a tad lean of optimal.

[gpman]

I will pull the current map from the bike and post a screenshot of it on here to show what the map itself looks like.

[Cali Badazz !!!]

i just wanted to know how your bikes running and if you like the mods you did.. i could have got any pipe i wanted at any cost but found the rich sound of the R-77 to not be to loud but still sound like a big bore bike when opened up. steelernation said it best.. it's still the fastest bike out there! and in orange it is by far the best looking too:oh yeah:

[Draco1340]

He also said I could purchase a Dynojet multihub and run two maps (I would have to pay for the second map) one with the R77 Core in and one with the Core out for more HP.

I probably should have bought the Bazzaz fi, I believe it already supports two maps with no additional modules required.

:surprise:

You don't need to buy a multihub to run multiple maps with your dynojet. Thats an unnecessary expense. You can have your tuner store both maps on a CD or thumb drive and just swap back and forth with a laptop and the software that the Dynojet comes with. Be careful of people trying to sell you things you don't need.

[gpman]

The bike is running great with the new mods, my wife and I have been riding it every chance we get (over 1200 miles now), I am taking both of my bikes to Eagles Canyon Raceway on Saturday (it's just north of Dallas, TX). This will be my first time at this track and first time on the track with the Busa so hopefully it will not rain and I can get a good feel for the bike in the dry. :yahoo:

http://www.texastrackdays.com/eagles-canyon.html

This track just opened up last year, it's supposed to be a very nice track (Professional MC riders had input into the track design).

[gpman]

On the Multi-hub subject, I told the Dynojet tech that I was thinking of getting two maps so I would have a high performance map for track days I was just thinking of pushing the map I needed with my laptop. That was when he mentioned buying the multi-hub, the pictures for it show a switch you can mount on your handle bars to switch between two maps.

Map Selection Switch: Connecting the optional Map Selection Switch allows the rider to switch between two different maps within the Power Commander. For Touring Bikes this could be used to switch between a "fuel economy map" for long rides and a "full performance map".

I might consider this option, first I would have to know what kind of power gains would be achieved just by removing the "core/baffles" on the R77, I will not be racing the bike other than trackdays, does anyone have an idea if this would be worth the expense (Multi-hub $159.00, new map $275.00)

[gpman]

Here is the map data for the Dynojet Map, I left out all rows with all 0's (500, 750, 100 1250 & 11250, 11500, 11750, 12000).

[Tybalt]

Great read :cheers: Gpman,

[Cali Badazz !!!]

Quasar will be able to tell you better but my thoughs are unless your lapping at expert level a bone stock busa would be more then enough power 4 anyone.. i do think you will want some new brake pads up front to keep from soiling your shorts when the big girl doesn't wanna slow down. bring a nice screwdriver one that wont bugger up the adjusters and add a few clicks of compression to the front and rear it will overload the front and have the rear wheel skipping under heavy braking..ps it's all heavy braking when going fast on a hayabusa..have fun take pics 4 us

[2008haya]

I have a 2008 busa with full rs77 , pc and stock filter and it dyno @ 188.9 with 112lb of torque. the tuner said that generic map from dyno jet is no good and with a good custom map i should be seeing numbers close to 195+. My boy has a 2008 zx14 with a full muzzy bmc filter , one tooth down on the front sprocket , front scoop , and a g pak. everytime we line up i bet him but only because his shifting sucks , if he knew how to shift the race would be even. And his bike dyno's close to 200hp @ the wheel. its all about the rider cuz

[gpman]

The bike definitely has plenty of power, it's fast as hell, my only worry with the dyno numbers so low was that something was wrong with the bike but other peeps are also seeing low numbers so I am not concerned about it anymore.

This type of forum is good for sharing information, that's why I posted on this subject. Let's see how the busa does at Eagles Canyon Raceway (riding in intermediate class) this weekend, I will be able to compare the power against other fast bikes on the straights and coming out of the corners, should be a great time.:rocket bike:

[Mpeavler]

I have a 2008 busa with full rs77 , pc and stock filter and it dyno @ 188.9 with 112lb of torque. the tuner said that generic map from dyno jet is no good and with a good custom map i should be seeing numbers close to 195+. My boy has a 2008 zx14 with a full muzzy bmc filter , one tooth down on the front sprocket , front scoop , and a g pak. everytime we line up i bet him but only because his shifting sucks , if he knew how to shift the race would be even. And his bike dyno's close to 200hp @ the wheel. its all about the rider cuz



Do you mind showing the dyno graph of your bike?

Mike

[2008haya]

sure will when i locate it , i think my wife might thru it away yesterday cleaning out my garage. i guy did four pulls the first one was 187 the rest 188 will post tomorrow if i can find the chart.

[2008haya]

here's the dyno sheet you request the wife didnt throw it away lol

[Mpeavler]

Nice pulls....:thumbs up: