Proof...No two Heats are the same!!
 

For the speed freaks!!
Well, although very confused the results are impressive.
SteveZ , BobL and a couple others may all find this very interesting.
As some of you know I pulled my ProCharged 548 and sold/installed it in a friends 2002 28 Heat. In exchange I installed his HP500EFI in mine and sold it and bought RVs Flame.
I have, from the first test drive with my motor in his boat, felt that this boat was lighter and much quicker than my 2001 Heat. Nothing was touched on this motor. A simple swap; drive included.
I felt my boat with the blower motor was fairly impressive with consistent runs of 85-86 GPS mph at 5000 feet elevation on any day. When dropping to Mead at 1200 feet or Havasu I would get consistent runs of 88-89 on GPS the few times we were down there and one time racing another boat we were slightly pulling away and he came back and said his GPS showed 91.something. This was on rough water and windy conditions. OK, whatever… :rolleyes:
Well, my friend took his boat to Havasu this past weekend for the poker run. He took two props; Linnie’s old Mercury Racing lab 30 with added cup (right Linnie?) and a brand new stock 30.
He called me Friday and was pretty up. With Linnie’s lab 30 he registered a 92.8 and said he felt there was more throttle and he was getting near 6000rpm so he backed off. (his tach is 200 fast when hooked to my laptop) Rev limiter is set at 5850.
I thought that was pretty impressive until Saturday. He called me that afternoon and after putting on the new stock 30 and said he was right at 6000rpm, a tick over 100 on the speedo and 95.5 on the GPS which he saved and showed me last night. Three good size guys and over half a tank :drink:
These are real numbers from a “very” reliable friend. A very happy friend I might add!! I promised him 90 so we did a little better. Now I’m wondering what a 32 would do. Probably about the same at lower rpm and boost. I know the ProCharger is making tremendous power at those rpms. I need to get him down a bit so I think a 32 or perhaps a 29 or 30 P5-X would do the trick.

Either my boat was slow or this one is very light.
This is the boat that sits 5-6” higher out of the water when we’re tied up together :(
Can there be this much inconsistency in the build???
X dimensions appear to be the same also.
This makes me wonder and is solid proof that there are no two boats alike.

Meanwhile, I’ll now just sit back and enjoy a blended margarita and watch them go by!!

Dave

Re: Proof...No two Heats are the same!!
 

that is fast. did your friend say how the hull handed

Re: Proof...No two Heats are the same!!
 

Never asked yesterday...
Just got off the phone and he said it felt fine but did feel a hint of rocking when hitting small bumps.

Re: Proof...No two Heats are the same!!
 

Dave:
Those #s are VERY impressive.
As we suspected, "production variations"...............either this boat is light (our's are heavy), or the bottom is perfect, and we have (had in your case) hook in ours. I suspect weight since it sat so much higher at rest than yours did.
Try to get it weighed if possible and note the fuel level. I can weigh mine and we'll compare notes.
Regards,
Steve

Re: Proof...No two Heats are the same!!
 

Steve,
do you have a Nordic trailer? I'm assuming that's the only way to weigh one and that would need to be the same also.
I'll see if we can't get him to do that.
Dave

Re: Proof...No two Heats are the same!!
 

wondering if its in the CG little more in the cabin vs the other heat
vs over all wieght.

Re: Proof...No two Heats are the same!!
 

Dave,

They are great numbers. There is a lot of altitude difference. Also you are in the cool, low humidity days now. I bet the days you were down there where higher numbers. Blowers love that. With high altitude the air is less dense which hurt blowers.

I wish he had run both props the same day. I have gone out the next day and could not get anything to happen. Weather seemed simular but not he same.

It sounds like the fuel curve could be a little rich, the lower altitude made it lean out and run.

All GPS are not equal, I have run my in dash and hand held and seen 2-3 MPH difference, both ways.

Different hulls work better for some reason. Not sure why but you have to be careful not to load too much in the front. 1/2" of drive height makes a great difference. When I had a Velocity we measured four boat off the flat notch in the transom and all four where different. The highest one ran fastest. The lower one slowest. At 90 a nose cone really helps with slip.

Regardless, That is hauling $ss! I think a 32 would be a good try. I better option would be to install 1.32 gears in the drive and keep the 30's.

Good Luck, My buddy Ricky is going to get his new 28 this weekend. I plan on helping him to

Re: Proof...No two Heats are the same!!
 

Dave,
Didn't think about that. My trailer is a 2 axel MYCO.
Regards,
Steve

Re: Proof...No two Heats are the same!!
 

good info..wonder how much difference in the heat transom to the vent on hull

Re: Proof...No two Heats are the same!!
 

Linnie,
All good points but unfortunately we are very intimate with altitude and it's effects in these parts. Our boating goes from 600 to 7000 feet and we deal with it daily :(
These test are equal comparisons of this motor other than the hull. The speeds achieved were in 90 degree Havasu weather. Same as several of my former 88-89 mph runs.
The comparisons are under very similar conditions and at the same altitudes. No differences here. Also in our findings, intercooled blower motors are much less effected by the likes of temp and altitude. The naturally aspirated motors actually take the brutal hit here.
The lab 30 was at the 6000 mark pretty much instantly and was obviously not sufficient. Niether are enough prop but the stocker was much closer. These will be good props for our home elevations and higher though.
No leaning out on my motor :D Were one up on the Merc stuff. The system is closed loop and I programmed it to run a perfect mixture of 11:1 at WOT (13.5:1 at cruise) regardless of temp, altitude, load or anything else you can think of short of a broken wide band O2 sensor.

So with those possibilities exhausted I would really like to know the weights and CG differences in this case. Same motor and drive, closed bow, the newer hull sits out of the water 5-6" higher with the same load. It al points to the hull in this case.

We may never know the answer :(
Hmmmmm...
Dave