`02 Dyno Chart
- Thread starter WarBaby
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04GSXR1300
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I am new to the board, so I have a question for you. What is the stock hp and tq for an 04' Busa? I searched but couldn't find any results. Thanks for any info!
04GSXR1300
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Cool, thanks for the info! Yeah, I agree, dyno's have variances and tunability. I just had never seen a stock dyno graph, only modded.
da busa guy
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i have a question about dynoing (is that a word?) a Busa, stock is somewhere between 148 and 160 at the wheel. but on a dyno that does not take into account the ram air effect at higher speeds, seems like at high speeds it would be quite a positive pressure increase kind of like a turbo with maybe only 2-3 pounds of boost but more hp because of cooler denser air than a turbo. has anyone ever measured this effect and or pressure at speed. i remember reading in a mustang mag using equipment to measure this seems like it was 1 or 2 pounds of dare i say boost at 100 mph.besides aerodynamic bodywork, is this the reason a Busa is faster than bikes that make more hp on a dyno.so maybe at speed this same busa may make 175 or 180 at the wheel just wondering or is this retarded thinking.
Not retarded thinking at all--you're on track.
I was told by a Busa "pro" (whom I greatly respect) that the Ram air is good for 6 - 9 RWHP at maximum speed. The HP could not be measured directly but the air box pressure could be measured at top speed vs no movement. The measured pressure was mathematically converted to the 6 - 9 HP factor. At least 5 - 7 HP certainly seems likely to me. Otherwise, why would Suzuki bother with ram air?!
Wow... you gained 8rwhp and 4 rwt with the "race trim" mods? Sweet!
The 166rwhp does sound normal though with your mods in "street trim". Very cool.... but why print it in STD? SAE correction factors are much more accurate, no?
Besides, STD is always on the optimistic side... generally reading 4.4% higher than SAE.
Either way, that's a nice powerband... lot's of power under the curve.
Is there a way to cure the drop off in power after peak?
The 166rwhp does sound normal though with your mods in "street trim". Very cool.... but why print it in STD? SAE correction factors are much more accurate, no?
Besides, STD is always on the optimistic side... generally reading 4.4% higher than SAE.
Either way, that's a nice powerband... lot's of power under the curve.
Is there a way to cure the drop off in power after peak?
Oh to add to the ram air question....
the Busa's ram air is rather inefficient.... Suzuki placed the ducts in a bad place.
The highest point of pressure is right infront of the nose of the bike before the bike splits the air. The busa's air ducts are not only towards the sides... but also integrated in a way so that the air flows over the duct instead of inside it.
Those amazing aerodynamics hurt the ram air's ability to catch air .... the placement of the ducts and it's size is just poor engineering.
I'm not trying to wave the Kawi flag here... but kawasaki pioneered the use of ram air on bikes... they are proven to have the most efficient and power ram air systems of all the bikes.
Look at where they place their ram air ducts.... centered and forward.. usually in the form of a scoop under the nose of the bike or as with recent models... smack in the center of the front cowl (zx6r and zx10r).
Though not as aerodynamic ... the power from the ram air's added efficiency makes up for it plus some. bad thing is when going Turbo.... there is no use for the ram air and the exposed air ducts only slow the bike down.
Another reason why the Busa is just such a great turbo platform.
As for the power gained... the Busa will gain roughly 5-6rwhp ... but sadly it doesn't start to pressurise the airbox till around 140mph... so the ram air doesn't even show itself till around 160mph.
Other bikes like the Ninja's start making power at speeds as low as 85mph thanks to their efficient ram air systems.
At full blast the Ninja's (mainly the ZX9R and 12R) are making roughly 0.7 psi (boost) with the ram air.
Each 1 psi is worth roughly 14rwhp from what I'm told.
the Busa's ram air is rather inefficient.... Suzuki placed the ducts in a bad place.
The highest point of pressure is right infront of the nose of the bike before the bike splits the air. The busa's air ducts are not only towards the sides... but also integrated in a way so that the air flows over the duct instead of inside it.
Those amazing aerodynamics hurt the ram air's ability to catch air .... the placement of the ducts and it's size is just poor engineering.
I'm not trying to wave the Kawi flag here... but kawasaki pioneered the use of ram air on bikes... they are proven to have the most efficient and power ram air systems of all the bikes.
Look at where they place their ram air ducts.... centered and forward.. usually in the form of a scoop under the nose of the bike or as with recent models... smack in the center of the front cowl (zx6r and zx10r).
Though not as aerodynamic ... the power from the ram air's added efficiency makes up for it plus some. bad thing is when going Turbo.... there is no use for the ram air and the exposed air ducts only slow the bike down.
Another reason why the Busa is just such a great turbo platform.
As for the power gained... the Busa will gain roughly 5-6rwhp ... but sadly it doesn't start to pressurise the airbox till around 140mph... so the ram air doesn't even show itself till around 160mph.
Other bikes like the Ninja's start making power at speeds as low as 85mph thanks to their efficient ram air systems.
At full blast the Ninja's (mainly the ZX9R and 12R) are making roughly 0.7 psi (boost) with the ram air.
Each 1 psi is worth roughly 14rwhp from what I'm told.
da busa guy
Registered
intresting info, thanks for the replys, warbaby you know your stuff. 12 wondering if the Kawi ram air is so effecient how come it doesn't seem to show up at the track.the Kawi has more hp on the dyno, in the quarter it should blast the Busa,esp with the effecient ram air , most of the 1/4 mile speeds are pretty close from what i have read about.traction and torque make ET and HP makes miles an hour,right?
I'm under the impression that the ram air doesn't work after 140mph due to the air just going by them instead of in them . I will be installing the tube extentions for my high speed runs next summer.[/QUOTE]
I've heard that too but I also heard that the extensions aren't long enough to actually increase air box pressure. I don't know.
Good luck with your top-end runs!
I've heard that too but I also heard that the extensions aren't long enough to actually increase air box pressure. I don't know.
da busa guy- The ram air is only present down the back half of the 1/4 mile... it's almost non existant in the 1/8th. So from 112mph -140mph you've got about maybe 2rwhp being made from the ram air with maybe 3-4rwhp as you cross the traps.
I'm sure it does help somewhat... maybe 1mph at best. Why does it still trap close to the Busa's mph with that extra power? Because the Busa makes up for it in the first couple gears via more powerful midrange.
These bikes make power in different ways... the advantage the 12R has up top is just as important as the Busa's advantage in the midrange.
If you take a look at the 1/8 mile MPH of the busa and 12... the Busa usually is faster, yet in the 1/4 they are identical, showing the 12R is charging harder down the back half making up ground.
Warbaby- You are right, they don't work for top speed runs! A couple guys I know tested them on a Busa with a GPS. They made NO difference in MPH. This could be because the aerodynamic drag it produces negates the power gained... or that they don't stick out far enough in front of the bike to be in the place of highest pressure (in front of the nose). Or maybe it's a combination of both.
I do however know that removing the screen in the ducts helps... but you'll be cleaning your filter more often.
<!--EDIT|Phantom12
Reason for Edit: None given...|1124593264 -->
I'm sure it does help somewhat... maybe 1mph at best. Why does it still trap close to the Busa's mph with that extra power? Because the Busa makes up for it in the first couple gears via more powerful midrange.
These bikes make power in different ways... the advantage the 12R has up top is just as important as the Busa's advantage in the midrange.
If you take a look at the 1/8 mile MPH of the busa and 12... the Busa usually is faster, yet in the 1/4 they are identical, showing the 12R is charging harder down the back half making up ground.
Warbaby- You are right, they don't work for top speed runs! A couple guys I know tested them on a Busa with a GPS. They made NO difference in MPH. This could be because the aerodynamic drag it produces negates the power gained... or that they don't stick out far enough in front of the bike to be in the place of highest pressure (in front of the nose). Or maybe it's a combination of both.
I do however know that removing the screen in the ducts helps... but you'll be cleaning your filter more often.
<!--EDIT|Phantom12
Reason for Edit: None given...|1124593264 -->
Pretty good read there P12. And yes, the ram air effect you state comparing the Busa and ZX12 is right on-point.
The ram air ducts are in fact nicely placed for turbo mods.
Although one of them is redundant when the intake runner is plumbed through it, the other is perfect for flowing nice cold air over the intercooler core resulting in excellent temp drops and more hp gain than any minor aerodynamics could achieve.
Depending on your intercooler is fitted.
...Good analysis there mate!
Well, think about it this way...The ram air ducts are in fact nicely placed for turbo mods.
Although one of them is redundant when the intake runner is plumbed through it, the other is perfect for flowing nice cold air over the intercooler core resulting in excellent temp drops and more hp gain than any minor aerodynamics could achieve.
Depending on your intercooler is fitted.
how much cooler would that intercooler get if you had more air flowing through it?
Of course, it probably wouldn't matter much on a turbo application... you're already making gobs of power, cooler air temps wouldn't make enough of a difference to negate the advantage of having a more aerodynamic front cowl.
On an N/A or Nitrous bike... it would substantially effect the power gains.
But then again... I have a feeling Suzuki had "turbo" on the mind when developing the Hayabusa. It's seen as the poster child of what a turbo platform should be like.
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