TURBO BUSA: LOW HP NUMBERS

[Cecil_Stringer]

The bike is a stock motor, .080 base gasket, water injected Velocity Racing Stage II dual ball bearing turbo set-up.
It has a 7.25 lb spring in the waste gate.

The dyno is a brand new DJ 250i.... sea level... low humidity... 75 degree air temp.

With the 7.25 lb spring, the bike showed 10psi on the gauge and produced <span style='color:Red'>205rwhp</span>.

With the second stage of boost reading 15psi on the gauge it produced <span style='color:Red'>301rwhp</span>.

The boost level holds solid at the gauge for the given setting (ie: it does not appear to creep).

Could my gauge be off by ~30%? And if so, are these numbers still LOW?

The bike runs strong and smooth.

<span style='color:Blue'>Why on earth would my HP numbers be so low?

What should I check?

Cylinder pressure???</span>

Thanks!

 

[Mad`]

Cecil, what's the Air/Fuel doing?
Mad`

 

[Johnnycheese]

Cecil, what's the Air/Fuel doing?
Mad`

yes,
grasshopper we are learning

 

[Mad`]

Yes Johnny. Thanks to you I have learned.

Air/Fuel is the target, horsepower is the by-product.
Mad`

 

[K Wolf]

Were the cams degreed after the base gasket was installed?

 

[Cecil_Stringer]

Were the cams degreed after the base gasket was installed?

Yes.... they had "Kaotic" timing... then when we rebuilt it, they were set right back to their positions.

 

[fstbusa]

what water jet you running? only run a 0.4 or something like that.... can't remember exactly the size.

 

[Mad`]

The most important thing to be considered is your air/fuel ratio. What is it at 100% throttle from 5K to 10K? Nothing else matters without knowing your A/F ratio. Are you capable of logging your A/F ratio?
Mad`

 

[Cecil_Stringer]

The most important thing to be considered is your air/fuel ratio. What is it at 100% throttle from 5K to 10K? Nothing else matters without knowing your A/F ratio. Are you capable of logging your A/F ratio?
Mad`

Yes, I am capable of logging the A/F ratio... once we fabricate a holder for the dump-pipe.

This is go stuff to know...

I'll post up the findings.



And I do not know which jet (size) the water injection is using.... I do know it comes on at 6psi.

 

[Mad`]

Good luck Cecil.

Mad`



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