Topped out a 2005 Hayabusa
- Thread starter Lucky34
- Start date
12.9 will be too lean with ram air coming in....
Phantom,
How do you figure?
He has a stock bike with a TRE. The only mods he has other than the TRE hurt is AERO putting him at a disadvantage over stock so.....he is running pretty close to what he should be.
Got-Busa?- You're absolutely correct. I had misread his mod list and mistook his slip-on's for a full system. My mistake. With just the slip-on's, double bubble, and TRE ... 188 into a headwind is very good.
As for the double bubble... it helps aerodynamics believe it or not. Sure, it increases frontal area slightly but it allows a cleaner flow of air over the rider and helmet. Unless you're a midget... you can't get cleanly behind the stock busa windscreen and still be able to look ahead at the road.
Besides, having your helmet bobble around hurts the flow of air over you tremendously... not just your neck.
gnd111- 12.9:1 up top is right around where you want it. There's been years and years of testing and N/A busa's like to be around 12.8-12.9:1 for maximum speed in the real world.
Being too lean is around 13.1:1 and up.... although the GSXR1000's actually seem to run better on the lean side at 13.1:1
I'm not just making this up.... guys down here have tested different maps with a GPS and the highest MPH's were attained at 12.8:1 - 12.9:1.
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As for the double bubble... it helps aerodynamics believe it or not. Sure, it increases frontal area slightly but it allows a cleaner flow of air over the rider and helmet. Unless you're a midget... you can't get cleanly behind the stock busa windscreen and still be able to look ahead at the road.
Besides, having your helmet bobble around hurts the flow of air over you tremendously... not just your neck.
gnd111- 12.9:1 up top is right around where you want it. There's been years and years of testing and N/A busa's like to be around 12.8-12.9:1 for maximum speed in the real world.
Being too lean is around 13.1:1 and up.... although the GSXR1000's actually seem to run better on the lean side at 13.1:1
I'm not just making this up.... guys down here have tested different maps with a GPS and the highest MPH's were attained at 12.8:1 - 12.9:1.
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DONT WE ALL!!!!!
His tuning picks up 2-4mph over custom maps made by certified dynojet tuners. I don't know how he does it... but he does it.
And to boot, he's never shy to offer helpful advice.
Only thing is.... his waiting list is huge. I've been waiting since last year to get him to wrench on my bike! Oh well, I know it's going to be worth it so it doesn't bother me none.
His tuning picks up 2-4mph over custom maps made by certified dynojet tuners. I don't know how he does it... but he does it.
And to boot, he's never shy to offer helpful advice.
Only thing is.... his waiting list is huge. I've been waiting since last year to get him to wrench on my bike! Oh well, I know it's going to be worth it so it doesn't bother me none.
GPS speed accuracy
google search "gps speed accuracy" and there are a few good articles the link above is to a good one, since SA (selective availability) was done away with, they are very accurate.
I don't think anyone bothered to correct him because it was so far off. This isn't the 1980's, GPS is very accurate...
i was just reading this thread and was thinking has anyone checked to see if the tre since its sending a 5th gear map to the puter then the engine is losing power up top not having the 6th gear map for extra fuel for ram air? i think this would definately take away power up top.
Nolo, I believe the fuel map is the same in every gear. The timing is however a different story. As for the ram air, I believe that's compensated for by sensors in the airbox, much like how the air temp sensor tells the ECU to add or subtract fuel based on temp.
I could be wrong, but that's how it is set-up on the 12's.. I dont see why it would be any different on the Busa.
I could be wrong, but that's how it is set-up on the 12's.. I dont see why it would be any different on the Busa.
arcticbusa
Registered
From what I understood the stock "99" gearing of 18/40 has been replaced with 17/40 and then made even lower by people wanting acceleration. This was done in addition to timing and fuel to restrict both the horsepower and top speed of the hayabusa.
**edit: This appears to be wrong. I am still unsure what gearing they have used over the years and will need to collect that information. I've heard everything from 17/42, 18/40, 17/40...so right now I need some scientific posts either from Suzuki or someone who owns a 99 bike.
So without 18/40 you won't be able to hit top speed, but instead hit a mechanical (rev limiter x gearing) wall.
I have yet to prove this, and will be testing this theory out this summer.
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**edit: This appears to be wrong. I am still unsure what gearing they have used over the years and will need to collect that information. I've heard everything from 17/42, 18/40, 17/40...so right now I need some scientific posts either from Suzuki or someone who owns a 99 bike.
So without 18/40 you won't be able to hit top speed, but instead hit a mechanical (rev limiter x gearing) wall.
I have yet to prove this, and will be testing this theory out this summer.
<!--EDIT|arcticbusa
Reason for Edit: None given...|1140894519 -->
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