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Michael T

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212rowboat

6.7 CTD's, just for the record, are an EPA wet dream... but there is hope, in aftermarket tuning.. They use pieziometric injectors set to deliver one cycle of injection from the factory, but are capable of spraying up to three times per compression stroke and then again on the power stroke, (total of four injection events)  chasing the piston south for added torque.... All of that leads up to better economy as well as better performance... 

The freakin EPA does everything on paper and in some laboratory environment and dispense their wisdom in the form of requirements based on their mathematics... In doing so, they do nobody.any favors but themselves... 

The same thing can be said for your gassers, MT, as the EPA's influence on American products translates to Canada down the road.. the cat and the o2 monitors DO allow a much better fuel trim and ignition timing to be automatically via pcm selected, but the backpressure created by the cats is real and present... The gassed isn't near as crippled as the diesel, though, and that is apparent in output while comparing an OE stock engine to one tuned for performance (performance including economy)... 

It's absolutely nuts how detuned those CTD's are... 

you're right, though, stock for stock in the displacement range of both your boats, you're better off than him.... Mod to mod, though, you would likely be in for a surprising and decisive turn of tables.. 

212rowboat

Just to give you an idea of how detuned those diesels are, there is a simple pcm upload file for PSD's that alters the injection timing... That's absolutely all it does.. that tune is called the HD300 for 'hot dang', and as the name implies, and it takes an OE engine producing 350HP/650#TQ and presses it to 550HP/900#TQ... a five minute effort is capable on those engines to turn them from docile to extravagant. 

Michael T

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212rowboat

And just to piggy back on to our agreement and your choice of gassers over oil squeezes: 

If money isn't a factor, the diesels in a boat north of 35' will outperform a gasser.. but, and this is a very expensive but: if the $50k upcharge for diesels was already done, and then the diesel(s) were tuned, you can toss the OE drive ratio out the window else spin those drives and need new ones pronto... Also, the prop pitches would have to be addressed.. you could easily turn likely three to four pitches higher without a problem between a tuned and an oe engine/drive... But, what does that do to low speed handling and maneuverability? .... Which means, you'd need thrusters for docking instead of just like thrusters for docking, and you'd most benefit from a two speed gear box... How much are we talking now? It is likely nearing double the $50k upcharge at this point, and, it's beyond the design of the hull which creates its own issues all by itself... 

I like oil squeezers... They fascinate me... But... You made the right choice with those big blocks. 

Michael T

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nhsd

10% interest from a bank??? I want the name of your bank :-)

Michael T

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Michael T

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Michael T

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