General Category > General waffle in here

Secondary flies / servo valve

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Matt83:
I think 99% of zx10 riders won't notice the difference between a bike with or without the secondaries anyway. As I said, unless you're going balls out I really wouldn't bother!

HammyUK:

--- Quote from: lukebolger on May 04, 2016, 01:21:08 PM ---I don't see how those numbers add up hammy. The servo valve is full open past six thousand rpm, so how can it add ten ft lb of torque at max pull on a dyno run when it's not operating

--- End quote ---

Did I say it was at max pull?
No - I didn't.
Peak torque is way down the rev range from max power.
Peak torque was reached by 8k on that bike tailing off rapidly after that.
The major difference was the fact the torque curve with the valve in place was linear - without it was full of troughs.
Between 4-8k the torque was around 20ftlb up - the gap only closing towards the 8k mark.

lukebolger:
OK. I hear you.

Ive been trying to get the valve put of the pipe so I can clean it. Taken off the nut, but nothing seems to budge and it's all rusted....

ukzx10r:
I did my gen1. Alot of work to do it properly. I did get 166.5 rwhp though and when mapped it behaved very well at slow speeds in traffic. To be honest i wouldnt bother. What you after more top speed. More torque? Id just concertrate on riding faster

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