Props for 38TG Non-Step ???
 

Anyone run something close to this before? Would like to cut to the chase when I get into prop testing next week. Where do you suggest I start and what speed do you think I'll run with this set up? Any other drive suggestions? Stand-off's? Spacers?

99- Kevlar TG - NO STEP
Max Machine Worx drives with Std. XR lowers 1.50
New 540's ...
Dyno#'s:
Motor 1: peak 791.91HP @ 6000 Pk Torq. 704.90 @ 5500
Motor 2: peak 773.29HP @ 6000 Pk Torq. 701.29 @ 5500

I Have 2000 TG no step 650-700HP w/ standoff boxes XR's running 30P at 5500, 82MPH.

Maybe you need 30 or 32!

I was going to start with 30's... I assumed 29-30. But maybe bigger is the ticket.

I'm thinking 30's.....what the hell did you build? Those numbers are up there, but are you going to prop the boat for 6K rpms????
I made peak HP at 5,200 (630HP) and peak TQ at 4,200 (700TQ). Prop'ed the boat for 5,400-5,500. Haven't dialed it in yet but running low 80's on 30P bravos so far.

Everyone is really pleased with the numbers we've turned out. 548CI NA with great head work. Thx to DEI's main guy. All new from the blocks up. Our philospy was to build the motors to handel 1200HP but only ask them to put out 800. I hope to have the boat in the water next week, but so far we look to have a pretty good reliable package. Not sure yet where we plan on propping the boat. Might want to see what nunbers we turn first... I would hope to see mid 80's with this set up. Thoughts?

A few spare drives might be a good idea as well!:eek: :eek: :drink: :evilb:

I would post something in the prop tech section and let the pros help you. With dyno sheets in hand and an idea of what you want out of the boat, Throttle up and BBlades can usually get pretty close on the first try. The both got it right on my re-power on the first try....but those are #6 props.

Good luck!





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you don't think the XR's will hold up? Or is it the max machine uppers?

BTW: I plan on speaking with Julie on this.

I had stock 28's with 650 ish HP and we were right on the limiter. You'll need at least 30 bravos and may want to look at some 5 blades and of course extra drives!

my 93 is only 525's and its turning 5000 with labbed 26s

You may see 90s with that power if set up right.Before we detuned our 97 Gun we ran 850+ hp with Max Worx 1.34 ratio ,30 pitch Bravos low to mid 90s after bottom hull work.After 3 blown drives we detuned to 750hp or so and in the heat still ran high 80s GPS.
Good Luck!

I think you will find the 30's to be the ticket. If your TG is a full cabin turn the props in.

Several tips to making drives live:
-Some slip is good, while coming on plane and flying in/out of the water the slip will "cushion" the jolt/torque on the drive.
-Come on plane easy.
-Go easy in/out of gear around docks.
-Change drive oil after 25-30 hours.

I run 4-blade lab 30's with XR uppers (Max caps), Imco 1.34 lowers on my 98 TG. In a little over 2 summers I've had to go through each drive only once.
I do run hard at times.
Good luck, enjoy it!

What power are you running and where's your speed at?

Who did your bottom? I'm seeing posts about blue printing for $1000. I was under the impression blue printing the hull was way more than that?

572 blower motors, turned down so not positive of hp, around 800-850??, flat water runs 90mph, some chop 3-5mph more on GPS.

My engine builder Rudy at Diamond Marine Performance DE did a quick fix on our pad to justify his hp. We gained an instant 6 to 7 mph and experienced way less porpoising.

Pad ?....Top Guns dont have a pad....I am interested in what he did do though ?

I have a 96 T/G with a full cabin with close to the same power
1st Motor made 796 hp @ 5250 and 880 ftLbs at 3200 rpm
2st motor made 778 hp @ 5250 and 880ftLbs at 3200 rpm
so my rpm's are lower then yours I also have Bravo XRs 1.50 and I'm on my third one
30 pitch did not work for me at all it ran 78mph @ 5300 on the rev limiters at about half throttle
now I have a set of 34s labbed bravo's running 84mph at 5300rpm on the rev limiters with about 26% slip
I also tryed a set of stock 32s from BBlades and ran 84 mph at 5300 rpm a little better slip
stock bottom with no hook and mph on gps
let me know what props you try
I'm thinking 5 or 6 blades????
Don

So what would the board suggest to use as good reliable drives? I can't afford to be washing through drives.

what drives are you thinking of that would be the strongest?

Yea...within reason. I'm not offshore racing. But I will have 800HP. I want to have reliability. I built my motors to handel 1200HP but only asking them to do 800. What drive set up would give me the same position? I'm 90% of the time in fresh lake water....so launching is not going to happen. I'm also pretty gentle getting on plane...

800hp with a bravo and you want reliability....ha :D You're going to need a spare or two.

Braking drives is what is holding me back on 5 and 6 blade props if I get my slip down and start hooking up I'm afraid of braking drives left and right I have talked to the Konrad guy's but don't want to part with the money

For the record...i have 2 spare bravo's but I'm hoping my maxmachines will hold.

OK then...what drives would you suggest and why? 800HP. And don't say #6's

I think you (as most of us with strait hull guns are) in that area at which it's difficult. Your options are Konrads or 3A's. Both of which are an expensive option which you will maybe recoup 20% of your cost when you resell. The up side is reliability. You can rebuild or even buy a number of xrs for the cost of the conversion. Is the down time trade off worth the reliability?

I'd love to put Konrada on my boat but I figured the cost to be around $35K with moving the engines and another $5k for stuff I forgot to price or didn't know I would need. Drives, transom assemblys, transmissions, hoses, new shift & throttle cables, props and on and on.

The old saying Fast-Reliable-Cheap..pick 2:(

92?? at the shootout

#6's....because they don't break!!!:D :D :evilb: :drink:

Damnit!

Here's a sneak peak...at the new power going in

They look sweet
Don

If your high slip is due to high drives then the 5B and 6B props may be an option...something definately worth looking at.

Julie

Thank's Julie ware would you start and do you have any demo's???
Don