Nizpro 150/175 SHO Flash

[Bass Cat Boats]

That’s an Australian product.

[Rich12]

That’s  a lot of HP gain for that engine.   Only way I know of to bump HP on any engine is timing and fuel air mixture.  I can see 20 maybe 25 hp tops.   I think that figure may be inflated.  I dont know, but I suspect that to get that, the fuel mixture is much leaner than I would want it. (possibly much higher rpm also.   Computers can do wonder on an engine but there are limits.   Dont think it will live long at that number.  Only other option would be a supercharger.

[Wheelman]

I agree it’s a big jump, but they do show a dyno graph posted. It looks like they raise the limiter and wonder if the play with the valve events as it’s got variable cam timing? Assume advanced ignition timing is why they require the higher octane fuel. They make 200hp on their non SHO 2.8L I4 and maybe it isn’t uncorked, as the 175hp Mercury 3.4L V6 is the same engine as the 200 and 225 they just allow it to ingest more air though the electronic throttle body.

 

 

[Rich12]

Interesting chart.  Lot of info you dont see on a dyno graph.   Just from looking at that, I dont believe that will be reliable.  Yes, you can mess with timing (includes ignition and valves). You can mess with opening up air intakes. None of that will give you the HP gain you see there.  Looks to be a great example of a Lean Burn engine.  We used to do this in Race cars for short track events qualifiers.  Heck of lot of HP gain, RPM with in limits, but still a lean burn engine.

The only thing I would like to see, is the spark plugs after 20 hours of running.  If they are whitish or very very light tan, would not give a dime for that.

[Wheelman]

 

Rich12:

Interesting chart.  Lot of info you dont see on a dyno graph.   Just from looking at that, I dont believe that will be reliable.  Yes, you can mess with timing (includes ignition and valves). You can mess with opening up air intakes. None of that will give you the HP gain you see there.  Looks to be a great example of a Lean Burn engine.  We used to do this in Race cars for short track events qualifiers.  Heck of lot of HP gain, RPM with in limits, but still a lean burn engine.

The only thing I would like to see, is the spark plugs after 20 hours of running.  If they are whitish or very very light tan, would not give a dime for that.

I agree increased ignition timing and retarding the cam isn’t going to see a 40% increase in power, but is the throttle body fully open on the stock 150 engine? The internals of the engine are the same on the 150, 175 and 200 Yamaha no? How much hp does the 200 really make? The 150 makes peak power of 166(10% rule) at less than 5k rpm and then flat lines to the limiter. Does the 200 make 220hp and then they add ignition timing as well retard the cam and let it rev higher since it shows to peak above stock rev limit to make the additional 10? Isn’t that what they do for the for the 4.2L V6 that takes a 200hp to 332hp?

[Author]

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