Re: Prop help Best Prop for a 28 heat
 

I havnt tried the 24 P yet. but with a mirage 23 on my 502 mag EFI Im getting between
58- 61 mph at 4800- 5000 Rpms weight 5800#- 5400# depending on water and air temps.

Re: Prop help Best Prop for a 28 heat
 

I think the cupped 24 is the correct prop for your boat. My calculations put your speed around 66-67 with the HP500 so I think you'd spin that 24 around 5100-5200 RPM.

Re: Prop help Best Prop for a 28 heat
 

thanks bob ill try the 24 then have throttle up add some cup if i hit the rev limiter.

Re: Prop help Best Prop for a 28 heat
 

I'm in the market for a boat around 28'. I recently inquired about a 2003 heat with a stock 496HO and the salesman told me it sees mid 80's. I assume this man is on crack?

Re: Prop help Best Prop for a 28 heat
 

He has some kinda of disfunction or he's just retarded :chimp: About 800hp will get you there :evilb: :evilb: :evilb:
67-68 will be the real numbers.
Dave

Re: Prop help Best Prop for a 28 heat
 

Thats what i thought after reading some of these posts. Thanks dave.

Re: Prop help Best Prop for a 28 heat
 

Guys,
Ran today with the 28" P5-X, this time loaded heavy, both tanks topped off. The boat ran 84 @ 5500. I'm grinning :D .
This was just a quick 1/4 mile blast. Very efficient in the midrange, 50 MPH @ 3500. These props are the sh*t on these boats.
Tomorrow I'm trying an Imco gearcase in the same gear ratio to see what that does.
Oh yeah, the pressure valve worked great with the intercooler. I'm very happy with the plumbing setup now.
I set it to kick in @ 8 PSI. Nothing at idle, gushing as the boat planes off.
Regards,
Steve

Re: Prop help Best Prop for a 28 heat
 

Century 29...I have a 2001 Heat with a 496HO and 67.8 is my best Top end.

By the way, it is for sale and very, very clean if you are interested.

Re: Prop help Best Prop for a 28 heat
 

Guys,
I ran the Imco lower unit today. Same ratio (1.50), same height (standard) gearcase, with the same 28" P5-X.
Objective results VS the XR, you heard it here 1st :rolleyes: ,
85 MPH @ 5600.
Net results are:
1 Gained 1 MPH
2 Gained 100 RPM
The boat was loaded (light on gear, 2 nearly full tanks, 1 person) exactly the same as yesterday. Test conditions were close to identical (60o air/50o water/moderate chop).
Is the Imco worth $2100 for a case, switching your internals for just 1 MPH? Tough call. Not too cost effective.
Upside though, I did hit the limiter, so there may be more there, It looks cool as hell, my water pressure was 10 PSI higher @ 28 PSI (better for the motor and intercooler).
Oh yeah, the boat did handle very well, maybe just a little better.
Regards,
Steve :drink:
PS Century 29, tell your dealer he is dead nuts on for speed, he's just 300 HP short.