Nordic Heat - 600sci motor upgrades
 

Just sent my PCM off to Whipple to get re-programed along with some other Dustin sugested upgrades.

1. Upgrading the PCM to raise the rev limit to 6000rpm from the current 5400rpm rev limit. Alter the timing curve and spark output. Increase the electronic boost bypass from the factory set 4.5 lbs to 7.5 lbs of boost.

2. Exchange the 4 inch blower pulley for a 3.25 inch pulley. Dustin says that this pulley will produce 7.5-8.5 lbs of boost. He is electronically limiting the boost on my boat to 7.5 lbs because he says my relatively mild cam will not support any more boost than this. The stock 700sci pulley is 3.5 inches and produces between 6 and 7 lbs of boost. Boost on the 700sci is limited to 7lbs. I will be upgrading to the 700sci cam or bigger in some future year.

3. Re-route the water inlet to the inner-cooler. In stock configuration, the innercooler water is taken off the power steering cooler. This is located after the oil cooler, and after the fuel cooler, making the teed-off water going to the innercooler, not that cool at all. The outlet on the power steering cooler will be blocked off, and a new T will come off just after the sea pump. Exit water from the innercooler will be dumped directly overboard instead of thru the exhaust.

All of this will raise my required fuel octane from 87 to 91.

Dustin has told me to prop the boat for aproximately 5800rpm. This is for valvetrain longativity, and the fact that he says that my smallish 600sci cam really doesnt produce any more power beyond that. He also says that my combo should produce aproximately 750 hp +/-, with aproximately the same number for torque.

I am hoping to hit the 90mph mark, but realize that this will also probably require some more prop/spacer setup work.

Currently the boat is going between 80 and 84 with 80-81 being the norm. The 84mph speed was set with a Hering 26 5 blade on the rev limiter at 5400 rpm. Slip was at 5.2%. I will not be using this prop because I think the increased hp, along with 5.2% slip, is a recipe for a broken outdrive.

Initial testing will be done with my benchmark 28 Bravo, which has been worked on, but I feel that I will probably be going to a 30 Bravo in some modified configuration.

Any thoughts or comments on any or all of this?

Chris

Sound Great Good Luck

sweet, cant wait to see the results

Recieved the parts today along with the re-programed PCM. I will be installing them tommorow down at OCM, and hopefully out on the water on Thursday for initial prop testing.

I am going to start out with the 1.5" spacer, and my benchmark 28 Bravo prop.

Chris

Hey CB,

Had a few adult beverages with OCM Tim last weekend in LA, I'd say you're in good hands. Saw pictures of your boat at the Portland show, looks awesome.

NG

Good Luck Chris! I hope you love it.

I agree... Tim Rocks!
I know he is always very busy, yet he always takes time to help out. I could not imagine a better dealer.

I will let you guys know as things progress,

Chris

Just got back from Portland and OCM where I did some water testing with the new upgrades. Just to recap, my boat was doing a consistant 80-81mph with the stock 600sci motor and lots of time on prop/spacer testing.

My best run was at 91.1mph using a stock Bravo 30 at 5800rpm. I did not get a digital photo of that run, but got one in the 90mph+ range.

The 90.4mph run was done using a Hering 27 pitch prop.

With my propshaft at 5" below the keel, I am getting chine walk at above 88mph. Especially with the 5 blade Hering. My plan is to start removing spacer to see if I can settle the boat down and remove or help the chine walk at speed.

I love the way the boat accelerates... especially between 60 and 85 mph. The Whipple sounds like a turbine when it starts producing boost at around 3500 rpm, and sets you back in the seat.

I picked up aproximately 10 mph for about a $2000 investment.

They say a picture is worth a thousand words:

Thankyou Dustin Whipple!

Chris

Those are big numbers CB...congrats. Surprised that the Herrings increased chine walk. Are you running any tab?

Thanks,

The boat does not have any tabs on it at this time. Looks like they might be in my near future. I think I could of eeked out a couple more mph if the chine walk situation was handled.

Chris

At those speeds I suggest K-Planes Vs standard tabs. A bit more cost but worth it.

Chris, congrats! I told you would like it.

Wow sweet dude, you would be the one to stick with it to get the last hair out of here. Very nice work. Maybe some tabs and another 1 to 2 ????? CONGRATS!!!!

Boost is your friend, good numbers. 600 in a heat is the way to go.

Tim,
That's a big number for a Heat with modified "stocK" power.
Way to go.
Best Regards,
Steve

Thanks guys,

Here is a re-do of my prop/spacer testing.

I am going to start taking spacer out of my drive in order to try to control the chine walk. I am having to trim out to just above 3/4 in order to get the high speeds. I am thinking about trying no spacer at first, and giving the Hering 27 another try. Should both increase slip, and hopefully help with the chine walking.
If not, then trim tabs are in order.

Any thoughts?

Chris

I dont understand how the 30 labbed turned less rpm then the 30 stock. I think a 32 labbed properly would be the ticket. Call Brett at Bblades he is the man. Bronson Hill also does a great job. They made the fastest prop for my old setup, it was a bravo 1 30 labbed I ran 87.8 on the limiter 5400

John,
I will give bret a call. Thanks for the info.
I was wondering about the prop thing also with the 30 lab.
It was the first prop I tried, and maybe I didn't trim it up as much.
I will have to give it another shot.

I never thought about it before, but now I can chase down some of the slower cats. :evilb:

In my 12 passenger, open bow, inner-tubing boat, with the mid-cabin, hide-away bed, and the kitchen sink.

HA ! ... Makes me chuckle!

Talk about a "do-it-all" boat, I love this thing!
Its not perfact... but it is getting close.

Chris

That thing will tear up some boats for sure.

Chris,
You should be able to run higher (less spacer depth) with the 5 blades. My boat runs well with a P5 with no spacer, still has good lift an acelleration. I never could get any Bravo to work without a 1" spacer, regardless of modifications. Since the P5 blade doesn't seem to mind the extra 1" of depth, I just left the spacer in so I could still run Bravos. They are much more plentiful and inexpensive.
Running higher should reduce your chinewalking too. A deeply submerged prop and gearcase tend to throw the boat around at high speed. You also mentioned you are trimming a lot to obtain those last few MPH. Your prop will semi-surface better higher (more RPM). Your boat should be more driveable when the prop shaft is parrallel to the pad, to 1 to 3 degrees positive trim at max speed.
Regards,
Steve

We found the 5 blades at standard drive height tend to get a little (or a lot) squirrley at over 90. 30 and 32 Bravos are rock solid at 94-100mph. This particular Heat also hated the spacer.
Go figure :rolleyes:
I've come to the conclusion that no two Heats are a like :)

Also you should be able to eliminate chine walk with props and spacers. Tabs would only be a luxury on this particular Heat. I say that because there was never a hint of even remotely needing them.

Chris,
give me a call at the office tomorrow.

Thanks,
Dave

Dave,

Thanks, I will give a call tommorow.
I only have the one number, and I left a message for you on it earlier this evening, before I got home and read your e-mail.

Thank you again.

Chris
206-235-4545

Hey Chris,

Stopped by OCM this past Thursday and checked out your boat, awesome! Really liked the clean graphics, also like your WOT numbers.

Congrats

Gary

I heard you want to go faster. Sounds like time to get a Cat

Thanks Gary,

I kind of like things clean and simple looking. The word classy comes to mind.

Having it haul ass isnt a bad thing either.

Chris

John,

I am always thinking about going faster.
I think it is some sort of incurable desease. :ernaehrung004:

Chris

Tim,

Not a problem...

I will just trade you straight across for that big, fast, 34 ft thing you have sitting in your shop.

Chris

Steve,

Thanks for the suggestions.

Have you ever tried "no spacer" with your IMCO lower?
With a Bravo prop?
With a P5x ?

Or did you just try the no spacer thing when you had the Merc lower?

I ask, because I have found that the IMCO lower is faster and more efficient (less prop slip) than the Merc lower on our boats.

Chris

Chris,
Slip in the high teens (Imco lower) to 20% (stock XR lower) with Bravos and no spacer. Never worked regardless of prop mods, like more cup to lock them up, midrange inefficient.
The P-5X did work fairly well with no spacer (Imco lower), @ stock X dimension. Never ran it with the XR gearcase.
Interestingly, it (the 5 blade) still seemed happy with the spacer (13% slip), so I left it in so I could run 4 blades too. Excellent acelleration, lift, midrange efficiency, not weight sensitive, good top end (93 @ 6000 best with your 28") and handling.
With a very tired motor at the end of last season, it ran 91 @ 5900 with your 28" P5-X, and 91 @ 5650 with a stock 29" P5-X. I'm looking forward to testing my T/U blueprinted 29" P-5X with a fresh motor this spring. I'm also going to test some Bravos and 4 blade Hydros. Will keep you guys posted as I get some results......
Regards,
Steve

Steve,

Thanks for the info,

Chris

Prop/Spacer testing update:

Went down to OCM today to test the boat with the spacer completely removed.
Thank you Tim, for getting this done while it was pouring rain last week.

As Steve commented, the 4 blade Bravo's were completely useless with the prop shaft only 3.5" deep, posting slip numbers between 22% and 24%. The best 4 blade speed was with a Bravo 32 @ 87.8 mph.

Now for the good news... Raising the drive removed about 70% of the chine-walking issues, and made the Hering props come into their own.

I initially tested my 27 Hering, and went 91.6 mph @ 5900 rpm. Very slight chine walk, but controlable. Because of the raised height of the outdrive, slip was about 9.8% This is only .3 mph faster than my previous best, but the boat was now controlable.

I was very pleased, but thought RPM was a little high.

Went back to OCM and Tim suggested that I triy his slightly massaged 29 Hering. (One of the two he likes running on the Flame), to bring the RPM down a bit.

WOWSER!!

93.3 mph @ 5700 :evilb:

Four runs, all between 92.9 and 93.3 mph

I am completely stoked!!

Tim and I are now arm wrestling, for the 29 Hering.
I am pretty sure I can take him... :ernaehrung004:

Chris

What size props does he run on the flame with 525's? You mentioned there were two. One is the 29, what is the other?

Great stuff Chris...
So ho much are these Herings :party-smiley-004:

Dave

Tim runs the Hering 29's on his flame.

And I just stole one of them :ernaehrung004:

Chris

Dave,

The Hering 5 blade Bravo props are about $1600 a peice.

This price includes having the props blueprinted, balanced, and adjusted if needed after running them on your boat.
Adjustment includes cupping, diameter reduction, trim ring removal, etc. Whatever is needed.
If the prop you purchase is not the correct pitch for your application, they will exchange it for the correct pitch.

Jeff at Hering is simply awsome to work with!

The props are hubless, and come splined for an XR shaft, to insure better balance, and lighter weight.
They also come with a teflon sleeve to insure a tight fit on the prop shaft.

They are works of art!

Chris

Sweet, nice work, again

Best speed to date = 94.1mph - one run.
Could not duplicate it.

Average between 92.9 and 93.3

29 Hering 5 blade, 15" diameter, 5600 rpm

I am going to try a 28 Hering next, to get my rpm up to the target 5800 rpm.

Chris

New personal best: 94.8 mph

The new trim tabs completely eliminate any chine walk, and the Hering 28 pitch 6 blade hauls butt!

I did three runs today over 94.4.

This trim tab placement works!

Chris

That's awesome.

Your continuous tuning has dramatically paid off.


UD

Tabs look sweet.