how fast???

[85diplomat]

I have an 85 diplomat with a 5.0 with a "few" mods to the engine. I'm running around 300 hp and was wondering what max speed this style of hull will handle. According to a couple of sources if I exceed 5000 rpm I should bump the prop up a pitch, but if I follow that logic I would be running a 23 pitch and potentially 85+ mph. I don't want to hurt the boat or myself but love to go fast. How fast is fast?

 

[85diplomat]

I have an 85 diplomat with a 5.0 with a "few" mods to the engine. I'm running around 300 hp and was wondering what max speed this style of hull will handle. According to a couple of sources if I exceed 5000 rpm I should bump the prop up a pitch, but if I follow that logic I would be running a 23 pitch and potentially 85+ mph. I don't want to hurt the boat or myself but love to go fast. How fast is fast?

 

[JW]

An '85 Diplomat with 300 hp is running around 72 mph MAX on gps, with the perfect prop. No way you'll be running 85 mph with a 23" prop and the standard Alpha lower unit.
That said, a boat is 'too fast' when it begins to handle poorly. Just keep adding power and prop until it feels dangerous, and then it's too fast

1995 2100BR/1995 225 Promax/23" Tempest

 

[Z06]

85

Thats better then most Pulsares'
With the 300X, it barely gets that speed.
Continue to try and fly to the sky, that wasn't sarcasm anyways.
You always have to aim high!

~~~~~~~~~~~~~~~~~~~
Chevy Corvette Z06
Z06
Chris E.
Checkmate Fanatic
Chris.Ellard9@sympatico.ca
2003CorvetteZ06@addr.com
http://pub37.ezboard.com/bchevycorvettez06personalforum

 

[Hooper]

Checkmate basically streched the bottom and added freeboard to the enchanter to create the Diplomat. They always ran faster than most people expected.

 

[Shameless]

The Diplomat is a fast boat, but not 85...

ZT 240 6.2litre 320 H.P