Hayabusa turbo build

Sooo my first test day happened yesterday on a cold day in England, the traction was awful so wasn’t able to lay down much power from the line.

Managed to do a 9.1 @ 163mph hardly putting in any power to the bike apart from the back end where we maxed 15psi for the last couple seconds of the run.

Shakedown went well and can’t wait for it to warm up so I can work on my 60ft times.

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Nice! Looks like you had a good time. Are you making clutch adjustments? Or still working on getting the feeling for it as it sits?
 
Tofy92 said:
Hey dude no clutch adjustments yet , I’m only leaving at 4500rpm currently and I’m not going to 100 percent throttle for like 2 seconds into the run so want to work on the throttle work first
Click to expand...
Just a question. I saw in your build list you had a multistage clutch. Why are you adjusting throttle? You should be tuning around the clutch and not throttle work. Just an observation. Also, 4500RPM for that turbo is low low, you could tell by the sound of the 2 step it was struggling a bit.
Like Busakiller said, once you get that 60' figured out, she'll be a nasty machine!
Do you have someone helping you tune and go through the setup there? You almost have the same build as mine, and I can tell ya, you get it figured out and it's 6 second capable. ;-)
 
So since my last time at the track a gen 2 clutch came up for sale locally and I just had to snag it up.

I went to to the track yesterday and managed a 1.4 60ft which I know is weak to most of you guys but coming from a 1.79 on my last test day I was Verry happy.

I’m launching at 6k rpm on 5psi of boost, running time based boost control maxing at 15psi for the moment . The data shows I’m launching at full throttle and keeping it pinned the entire time.

My plan for the next test day is to increase the boost on the front end of the track as I’m not seeing full boost till the 1/8th. It is currently quite a linear curve for the time x boost map .

My best overall yesterday was 8.49 @169mph


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Nice! 60' is coming along!
What are you running for statics and dynamics on your clutch? What's your stack height?
Do you plan on always leaving at 6000RPM? Or are you looking at increasing it? If you do, you may have to change your dynamics and your statics a bit. You may also want to consider removing 1 washer from the arms you have 3 on as it may be dragging the RPM down at clutch hit and delaying engagement on ramp up. I'm running mid/low 7s and only have 2 washers on the arms currently. But that's also because the tracks I race on aren't prepped like XDA and I can't throw alot of power to it.
 
ColdBusa said:
Nice! 60' is coming along!
What are you running for statics and dynamics on your clutch? What's your stack height?
Do you plan on always leaving at 6000RPM? Or are you looking at increasing it? If you do, you may have to change your dynamics and your statics a bit. You may also want to consider removing 1 washer from the arms you have 3 on as it may be dragging the RPM down at clutch hit and delaying engagement on ramp up. I'm running mid/low 7s and only have 2 washers on the arms currently. But that's also because the tracks I race on aren't prepped like XDA and I can't throw alot of power to it.
Click to expand...


Hey Dude,

Thank you for your input, i am hoping to raise the launch to 6500 and see how the bike behaves. here is a screen grab of my data log on the launch to 60ft.

I am unsure of my exact stack height as i find it hard to measure, so i am setting it up so that the air gap is to MTC specifications.

i am also unsure as to which springs are in it as i purchased it straight from another racer and put it into my bike.

i will be running it this weekend and will check which springs i am running.

log.jpg
 
Hey Tofy92. The pic below will help you. Remove the dynamics and measure them with a caliper to determine what you have in there. I was running what MTC had sent in mine and when I took them out and measured them, I found there were 4 different sizes and they weren't set up opposed properly. Once I put them in properly, man what a world of a difference. Make sure that the same spring is opposite eachother.
Measuring stack height is also done with a caliper and shouldn't be hard, when I'm home from work later this week, I'll snap a pic of how I measure mine.
Another note, since you still have 3 washers on every other arm, it will delay that arm from coming in, so you still may want to consider taking one off.
I can't see the data properly with how compressed it is, is there a chance you could remove everything from the trend except RPM and boost? I can't see properly how the clutch is reacting. Once I see that, I can definitely help ya.
Nice job on keeping it pinned! You did your job!

springs.png
 
ColdBusa said:
Hey Tofy92. The pic below will help you. Remove the dynamics and measure them with a caliper to determine what you have in there. I was running what MTC had sent in mine and when I took them out and measured them, I found there were 4 different sizes and they weren't set up opposed properly. Once I put them in properly, man what a world of a difference. Make sure that the same spring is opposite eachother.
Measuring stack height is also done with a caliper and shouldn't be hard, when I'm home from work later this week, I'll snap a pic of how I measure mine.
Another note, since you still have 3 washers on every other arm, it will delay that arm from coming in, so you still may want to consider taking one off.
I can't see the data properly with how compressed it is, is there a chance you could remove everything from the trend except RPM and boost? I can't see properly how the clutch is reacting. Once I see that, I can definitely help ya.
Nice job on keeping it pinned! You did your job!
Click to expand...
Hey dude, thank you for your help, i have the same tuning box with my gen.

Please see attached log with just boost x rpm.

log.jpg
 
Tofy92 said:
Hey dude, thank you for your help, i have the same tuning box with my gen.

Please see attached log with just boost x rpm.

View attachment 1650775
Click to expand...
Hey Tofy. DEFINITELY need to remove the third washer on those arms. Also, check those dynamics and see what you have. When you release the clutch lever, it is dragging down the motor too far causing the clutch to being to release and grab again. I'll grab a snapshot of how it should respond, but that's why there's also the 2 waves after the rpms go up again. What's the RPM flashing up to after you release the lever? Just after the second wave in the trend.
 
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