1397 on stk wheelebase ?

[00Busa]

My best was a 5.79 but high 5.80s and low 5.90s were consistent. I was also using VP U-4. 126~127 mph and 128.02 that one time on the 5.79 run.

Are you finding the the U4 has about the same A/F as pump gas or are you have to change your fuel mapping to run it?

My A/F ratio is 12.6~12.8 from 8500 to redline which is a little rich for optimum HP so I guess the U4 (oxygenated) helps to lean it out a little. I have tried VP-MRX01 compared to U4 and didn't get any extra advantage ($$$$). I guess a little more tuning on a dyno is needed to see a difference. I'm getting about 2 mph more with the race gas.



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[bhartley]

1397 motor .No spray I repeat NO spray .
Stock swingarm pulled all the way back.
Bike went high 8's with Spaz on it on motor the same day .
Made 226hp with good gas .
Ran at the rock with a light rider on the very first pass he made on it ran 8.60's at 163 and change . No NOS was on the bike . I know because I took it off before he ran .

B.

 

[00Busa]

I was there and saw that run, VERY LIGHT rider !!! That bike is moving and I understand that Spaz has sold it so it's still out there somewhere.

 

[58"Busa]

Sounds like fun to ride! Wish i had a 1397 kit!

 

[Badasssbusa]

Got a buddy that ways an easy 350lbs and is running 8.90s in the 1/4. On a stock wheel base 1397 busa. But you are talking about a rider than can push a bike to its limits everytime.