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The Hot Boat tests seem to be in line with what I've seen out of the Heat. First off, the mid cabin boats appear to be a couple of MPH slower than the closed bow versions. Secondly you guys need to test these things with GPS. The speedos are pretty optimistic(4-5 mph) in every boat I've seen. My boat read 78 on the speedo at 74 GPS. Even my tach reads 150 RPM high! I'm sure running in salt water on a good chop and cool weather the numbers for all our boats would be better. If you do the math on the speed/rpm numbers for the test in Hot Boat it appears that boat is actually running a 1.5:1 gear ratio. Their numbers are very close to what I have experienced with the same prop and 1.5 gears. If it has 1.36:1 gears then the prop slip is off the charts.
Bob

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Speedo numbers are absolutely useless in this forum :rolleyes:

All Heats, Rages and Flames I have been involved with have also had the speedos read 4-6 mph higher than actuals. I'm sure this is true of most all boats.

Someday maybe all boats will come with GPS tattle-tale speedos as standard issue and this illusion will disappear :drink:

I wonder how the Illmors would handle an M5 ProCharger with a mere 5 lbs of boost...Now that would be interesting :D :D

Dave

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If I had my GPS with me I would have used it. Just reported the only numbers I had. Boat came in at 8:00 PM Friday night before our Poker Run.

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Gary, do you notice any handling difference with the lighter motor?

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BTW this boat has a GPS speedo so the numbers are accurate

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For the guys that have done a procharger on a 502 mpi on the 28's. I am curious what is your cruise speed at say 3500 and 4000 rpm at approximately 500ft above see level.

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LIOPA, not trying to make waves, just trying to understand. :D The speeds you report seem to always be significantly more than others see. I have to assume it has to do with the water and weather conditions where you are operating the boats. I'm personally testing at 700 ft. elevation, smooth water, no current, 100 degree temps and moderate to high humidity. Now that everyone has a GPS, It's difficult dealing with customers when they expect a certain speed and don't even come close. "Boatingbent" bought a 28 with a 496HO. He was initially expecting speeds in the mid to upper 60's, maybe 70... based on the mfg. and some postings on this forum. Since he is a friend and a customer I kept telling him I didn't think he'd see those speeds. Maybe 64-65 tops. Well as it turns out he's getting an average of about 62. I think he's hit a best of 64. Those are real world numbers. I'm not surprised by the numbers on the Viper. They seem to be representative of what most everyone is getting. What conditions are you testing in getting the speeds you are reporting? The speed Nordic Gary reports (78 speedo, probably 73-74 GPS) sounds about right for the 550 HP Viper in average conditions.

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Magic, I don't have a procharger...but I've got a Whipple. Will that do? I'm running a 29 P5X prop and here are my numbers. The slip numbers are very high on these boats. I'm working with Throttle-Up to try to improve them some. I went from a 25 P5X to a 29 P5X and the cruise RPM did not drop very much. The speed is GPS and RPM is from a laptop reading the ECU. My tach is 150 RPM high. Anyway...35 MPH = 2800 RPM, 40 MPH = 3200, 50 MPH = 3700, 60 MPH is 4200, and 84 MPH = 5500 RPM. This is with 2 people. If I put 1-2 people in the bow the slip increases a lot.
Bob

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Bobl,

Thanks for the numbers I would really love to cruise at 50-55 at 3500 rpm. From the sounds of things that is going to take some serious horsepower. Where I boat top speed is not achieved that often, Lake Michigan is not very forgiving on a 28' boat. I hate and even refuse to run my motor over 3500 rpm for extended peroids of time.''


What is the general concensus on Vortech superchargers?? Everyone seems to be down on the prochargers. Are there any clearance issues with installing a supercharger in a heat, mine is a 99.

Has anyone done anything to increase airflow into the engine compartment, besides putting a scope. I have been thinking about putting some vents in the open area between the upper and lower seat.

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The difference in the feel of this boat is significant! In addition, my partner has a 2005 35 with twin 550 Vipers, you have to ride in this thing to believe the acceleration. This boat will run 100 according to my partner. The day a was in it we did not push it, saw 85. I personally own a 2005 35 Flame with 525's and have a GPS speedo which reads 91 MPH @WOT.

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Thanks Gary!! Great info...
I better start saving up for those Raylars :D :D

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Hi bobl,

We always have a 1-2 chop around Long Island which is ideal for the Nordics. We are also in salt water as well which adds to the speed somewhat. We also have a light breeze most of the time with low humidity and 75-80 degree temps. All these factors add up to an almost ideal running condition.

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We have a 2004 35 with 525's.....93.7 GPS

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Bob,
Wow, those #s are identical to mine, with minor variations for weather and load. I'm using a blueprinted 28" P5-X. I had 6 people on board Sunday, and with 4 of them being girls, quite a bit of their "accessories".
We ran 82.6GPS. Weather was mid 90s, water was high 80s.
1/2 tanks. I'll take it.
Now that I have the Garmin 172c, I've been comparing it's readings to my Gaffrig/Livorsi recall analog GPS speedo. It's interesting that my GPS speedo has just about always been a little slower than than the digital handhelds I've compared it to. I figured it out. The Garmin updates significantly quicker under accelleration.
Therefore, if I don't make a long pass, the Gaffrig hasn't reached max speed, vs the Garmins. Trivia, but interesting.
Regards,
Steve

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LIOPA, now I understand the performance differences. Thanks. I've seen my top speed vary as much as 8 MPH from one condition to another. My best is 87 and my worst is 80. One day the air was really bad and the water was glass. It was so sluggish I thought the engine broke.
Bob

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We don’t mean to beat on you LIOPA but it’s really hard for us that test and monitor test so closely to understand your numbers. As you can see from the following “verified” test, your test results are way out of the norm. If you were to graph these in Excel there would be a big blip on the screen :eek:
They sure don’t run like that out here in the west half of the USA; Regardless of conditions.
Think I’ll move East :rolleyes:
Dave

496MAG 61-62 verified
496MAG HO 64-66 (I think INDY once got 67 with the tide, in salt water and down hill)
HP500EFI Almost 67.5 GPS/70.1 Radar in Family and Performance Mag
HP500EFI ran 71.2 with stock 28 at 5150rpm in Powerboat and Hotboat
525EFI ran 74.1 at Havasu in the Spring (75 dry degrees) verified
Mild 540EFI (550hp) 73-75 verified
Merc 575SCi 75-76 verified
565ci/609 dyno hp XR ITS drive 75-76 verified
Illmor 625hp ran 76.6 in Powerboat
LIOPA 525EFI 78 and going for low 80s
HP500EFI with M3 ProCharger w 5lbs ran 79.7 in Powerboat and Hotboat
Larry Peto 580ci/675hp/700lbs tq ran right near 80 verified
Steve Zs 575SCi bumped up to 725-750hp runs 82-85 verified
565ci/Whipple ~800hp XR ITS drive 85-87 verified

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Steve,
my dash mount GPS is very slow to catch up with the hand held but when it does they are within .5mph.
Dave

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Dave,
Since the handhelds I've run have usually been stuffed in a can coozie and drink holder, I've never actually watched them under hard acelleration. We've just set them to catch max MPH. My new 172C is up high on top of the dash, and it's easy to see. It scrolls like slot machine when you punch the boat. The analog is usually 4-5 MPH behind it until the acelleration falls off around 80 or so, then they begin to equalize. If I hold it for say a 1/2 mile or more, like yours, they read very closely.
Here's another little bit of GPS trivia regarding antenna mounting.
I know this breaks the rules, but I already have one antenna for the Speedo, an XM antenna, and compass on top of the dash. The Garmin external antenna was pretty big so I mounted it UNDER the deck on the bulkhead near the stereo head unit. Works perfectly. So you don't need to rail mount or drill more holes in the dash, if you don't want to. It even worked in the garage, under the deck while I was mounting it so I figured it would well on the water. By the way, I also bought the "Eastern Lakes" chip to enhance the screen. Wow.
It knew what street I was on, which way the boat was pointed (without moving!?) and the feet above sea level at that location. It was another $100, but seems like it's worth it.
We were at Lake Cumberland last week for their Poker Run, and it showed the no wake zones perfectly as we entered them.............
I tried the 172C internal antenna, but with our low profile windshields, the antenna hit.
Best Regards,
Steve

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I still have the Lake Michigan area chip in mine. I need to upgrade so I can have the nice features for Powell, Mead, Havasu, etc...
I mounted my Sirius puck under the deck and it worked perfect once I got it out from under the bow rail :D
RV mounted the GPS antenna under the dash and it seems to work well as well. I hate extra stuff mounted around.
Dave

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Since we are all in the speed sharing mood...I thought I would share with the rest of you some real cool fender cleats that I Installed on my 28.......
I found these at Cabalas for $14.99 Each

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Few more

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One last picture...And also the link to the Mushroom cleats

http://www.cabelas.com/cabelas/en/co...eats&noImage=0

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boatingbent those look good. i've been wanting to do that to mine. thanks for the info.

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Dave,
We're on the same wavelength as usual. I like to keep it clean too.
The GPS Store www.gpsstore.com tells me that we can buy different CD ROMS and download the data into the same chip. Unless it's a high capacity chip, the prior data will probably be lost. These guys were very good to deal with. As I mentioned earlier I had an internal antenna 172 with clearance problems. They took it back and swapped it out with no BS.
BTW, Nordic Gary had both of his centerfold Flames at the Cumberland Poker Run. Beautiful boats. The TAOD boat is the prettier of the 2, but the "factory" boat isn't bad..............
I need a bigger garage and stock in BP/Amoco before I trade though :rolleyes: ..............
Have you compared your fuel usage in your Flame to your Heat? How do they compare?
Regards,
Steve

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Hey Nordic Flame,

Sorry to hear about those numbers. I post what ours run GPS. Many members on OSO have seen these boats run as well in local runs and Poker Runs. The 35 with 525's caught attention many times over for the speeds it gets. Everyone swore the motors were juiced.......and they are not. The 28 525 boat does has the ITS drive which we believe helped as well. Again out of the box was 76 with a 28 P prop. Labbed it and cupped it to 29 and we see 78. As stated earlier we have more to go. You are more than welcome to visit here and we can take out for yourself to see the GPS readings, if thats what you need to do. I will say your norm out West for the boats listed is below what we have seen here. Have you ran these in the ocean with some moderate chop under them on a cool day? TRY THAT...... you may be surprised what you find ;)

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....or Lonnie is rigging in JUICED GPS SPEEDOS on our boats....lol

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ALso in your highlights some difference but not much

The HAVASU boat ran 74.1 (what prop/drive/ chop) NO SALT

Ours 75-76 with stock prop / ITS DRIVE / SALT WATER/ CHOP

only .9 - 1.9 MPH off.........the salt water and chop combo we have seen as much as 4 MPH in some FORCE OFFSHORE cats between HAVASU runs and Long Island. V bottom 2-3 MPH.

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Hey Steve, it was nice meeting you last Friday. Hope your Poker run experience went well. Appreciate your comments on our boats.