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Nerd’s Eye View: Standing Mile Turbo ‘Busa

by Khiem Dinh

Many of us at MotoIQ ride on two wheels. I personally have a CBR 600RR. I rode an R1 once and had to get off after doing about 30 wheelies for fun. Hussain’s turbo Hayabusa probably has in the ballpark of eight times the power of my CBR. In my experience, it takes a special set of cajones to sit on top of an engine with that much power between your legs. We’re going to have a look at the parts which help this bike go over a quarter of a grand miles per hour in a mile from a standing start.

 
Sure, a Suzuki Hayabusa is fast stock, but everything with an engine is made better with a turbo!
A big Garrett GTX turbo crams the high pressure air into the engine for more power. To help the air make the turn into the compressor inlet, the massive air horn/trumpet/velocity stack gives the air a gentler radius over which to make the turn reducing the loss coefficient and reducing flow separation. A straight tube with sharp edges sticking out into the airstream would perform more poorly.
The big Garrett turbos typically use a V-band joint on the compressor discharge to ensure the outlet tube doesn’t blow off.
On the compressor outlet pipe is this hose tapped into the side.
The stock ‘Busa engine is only 1.3L, so trying to spin up a big turbo can take a while. A bit of nitrous to the rescue!
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Comments
Benjamin
Benjaminlink
Friday, June 10, 2016 6:48 AM
I feel like that air intake could be made to be way more efficient.
But it already goes 255... ahah
spdracerut
spdracerutlink
Saturday, June 11, 2016 1:15 PM
Ha! yeah... options are limited in fitting turbos onto bikes. Not much width to do anything for an intake. Possible to custom fab something though.
beesquare
beesquarelink
Monday, June 13, 2016 2:52 PM
Maybe clock the turbo 90 degrees so the air in faces the front and exhaust towards the rear. For sure easier said than done, but regardless this thing is a beast. Great article!
buzzboy
buzzboylink
Friday, June 24, 2016 9:14 AM
So depending on the year of your CBR you estimate this makes 776-840whp which is ~4 times the stock HP of a GSX-1300R. That is insanity.
spdracerut
spdracerutlink
Friday, June 24, 2016 2:12 PM
Yup. Looking at the turbo, it's at least a GTX4294R in size. That's a 900-950whp turbo. To make 4x the power of a stock 'Busa, it needs to run a compressor pressure ratio of ~4.0. That is well within the map of the GTX 94mm or 102mm exducer diameter compressor wheels.
SWR
SWRlink
Tuesday, March 21, 2017 6:33 AM
Since I like twisty roads - I live in Norway, what straights? - I think 326hp to the rear wheel in a 180 kg inc. fuel GSX-R1342 (GSX-R1100 punched out with 83mm bore and a billet crank of 62mm stroke) on a standard length chassis and a 230 mph top end will do fine for me. Until the 450 bhp version is ready....
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