Putting the Megabusa on the dyno today... Guesses?

[Hank]

Here in 2 hours I'll be putting my Megabusa on a Dynojet Chassis Dynamometer for the first time.

 

2006 Hayabusa 1300cc motor

Pair valve & system removed

Westfield long tube header

Yoshimura muffler

 

Any guesses on rear-wheel horsepower? Hell, I hope it has enough torque to turn the drum! Haha.

[WestTexasS2K]

141 hp

[DeanG]

Rwhp 123

[Kitcat]

RWHP= 137

Torque= 70

[pierats]

168 / 91

[Boxologist]

159 whp

80 ft#

[Hank]

WestTexasS2K is the winner with HP and pierats with torque.

 

http://www.hanksmegabusa.com/images/111409/01.gif

 

This seems on par with a stock Hayabusa engine without a power commander or other mods. I'm definitely happy about that. Although I hit the revlimiter in 6th gear (11,500rpm) the dyno graph stops at 9900rpm for some reason. The maximum speed was 117mph. I thought a Megabusa would go to 136mph, but maybe I'm wrong. I sent a text message to the shop owner to see if the Dynojet tach pick-up is limited to 9900rpm or if something happened during the dyno run. I know I hit the limiter, so as soon as he gets back with me I'll let you all know.

Edited November 14, 2009 by Hank

[Mondo]

Pretty good, should make for a quick car considering how light the car probably is.

It looks like you reached peak before 10,000rpm anyway so it shouldn't really matter seeing the last 1000rpm.

[Hank]

Yeah, but I'd like to know my top speed to determine if I top out on certain tracks or not. Hopefully the dyno owner is mistaken about the 117. Unfortunately I was busy looking at every other gauge but the speedo during the pull.

[WestTexasS2K]

So is the grand prize for winning a ride around the block if we ever meet face to face?

[Hank]

Sure, as long as I drive!

[Kitcat]

So it makes almost no power below 4K?

 

Pretty stout otherwise. About equal to the "200 hp" Zetecs on the dyno. 50 more hp than my Crossflow, 4 less torque. Also a pretty flat power curve as well.

[Hank]

The Megabusa experiences a tad bit of surging in the lower rpm band so I chose to start the run at 4000rpm. The dyno operator was a little slow on reaction time hitting the "sample button". It makes power below 4500rpm, I just don't want to damage anything. Besides, in a drag race, sprint, autocross or lapping day adventure the Megabusa won't experience anything below 4500rpm.

[DeanG]

Nice. Certainly better than I expected. Bike engined 7s sound awesome.

[Spaz]

  WestTexasS2K said:

So is the grand prize for winning a ride around the block if we ever meet face to face?

 

I think the winner should get a ride to Hooters

 

Wow, not bad. When people ask me how much hp I have in my 7 I usally say less than 100hp because I have a little 900CC motror. So around 97 would be in the ball park.

[Guest speedcraft]

nice smooth power curve Hank....whats the wet weight ?

[Hank]

I will be corner scaling the car this week *crosses fingers*. I hope under 1000 lb.

[Guest speedcraft]

i put in for 1175# on the other thread but thats fully wet with a full tank of gas, reverser box removed but shift actuator included.

 

btw - what wheels/tires did you end up with...i'm running 13" R888's but will switch over to the CR500s once i burn through what i got...the R888's are somewhat heavy and seem too stiff on the sidewall.

[Alex Vendler]

It looks like you have a bit of a tuning issue. It looks like you are not getting all your power. What kind of airbox are you running? If it's not stock, a power commander will really make a difference by optimizing the mixture.

 

As a point of reference, I have a race car powered by a 2007 Honda CBR1000RR engine and it's getting 142hp at the rear wheels. Stock header, stock intake. Your 'Busa can do better I bet.

[Hank]

Alex,

 

Definitely more power on the table. I may get around to putting a power commander on eventually. How much should I expect to gain?