boxes and xr's
 

Any opinions or experience on going from bravos on a 1998 38 t/g with 500's and changing to 16" boxes with XR's??? any opinions or ideas welcome!!!

Re: boxes and xr's
 

I would call Phil or Tres on this.

I had a straight bottom with 650hp/boxes and XR's. The boat may have been faster with this setup. However, the downside I believe was the porpoising. I could be wrong but my buddies without the boxes didn't seem to have the problem nearly as bad or at all.

Re: boxes and xr's
 

I honestly am not 100% sure but the boxes should really get rid of the porpoising issue. At least that is what everyone tells me. But I will take in any opinions.

Re: boxes and xr's
 

I here you.

I can only tell you that I had the setup you're after and I saw more porpoising with that boat. Find the sweet spot AND sweet speed and the porposising went away but it was brief. Change anything (even just a fraction) and you're back to re-dialing in the boat.

Our TS Gun is awesome - very little input if any. Still getting used to it.

Re: boxes and xr's
 

I noticed this as well. I own Shweeng's old TG. When I first started trying to figure out the best way to drive the boat I was using a little trim and some tab and the boat did porpoise unless I used tab until about 55 mph. I now have owned the boat for 6 months and think the boat runs better with no tab (only to get up on a plane) and the drives tucked until 55 mph then trim and fly :drink:

Re: boxes and xr's
 

Yes....the video proves the flying. We've got some great footage of you runing Sea Hawk.

Re: boxes and xr's
 

Yea baby. Let me see!! :eek: :evilb: :drink: :evilb: :drink: :evilb: :drink:

Re: boxes and xr's
 

You will run into porpoising with the props so far out back there.

My humble opinion.

Re: boxes and xr's
 

Important is if your TopGun is one with full cabin or without cabin. The TG's without has the porpoising problem and
with boxes the problem increasing.

Daniel - Switzerland

Re: boxes and xr's
 

With all the 90s top guns we installed boxes they needed a rear lifting strake adjustment. we did slight fiberglass mods and they liked it.

Re: boxes and xr's
 

Tres,

What is your opinion. I have a 1998 top gun full cabin. I am going from bravos to 16" boxes with xr's. Will this create a porpoising problem or relieve it? Give me any ideas or opinions.

Re: boxes and xr's
 

I installed boxes on a few 98s. I modified the bottom to correct the hop. All Cigs after early 90s had some hop to them because of a mold repair that was done at the factory. If you ask most TG owners they will tell you they need tab more than expected to stop the action or if you used Hydromotive props it took away the hop. Since boxes are going to move the CG back, you will more than likely introduce more action. The steps taken to alter the bottom are not hard nor expensive. In fact you should pick up a MPH from just that alone since most guns need alittle more High Psi at the rear.I did a 98 with 565 HP with stelling boxes and rear mods that would see 82 MPH.

Re: boxes and xr's
 

Tres fixed my 98 Top Gun and it rode much better, I have had boxes on a few of mine and they definately rode much better. Spend the few extra dollars to have it set up properly, even if you don't get more speed, it will ride much better, especially in rough water.

Re: boxes and xr's
 

Tres,
My 90 Top Gun Carbon with full cabin and twin 800hp with
Bravo drive and stock x dim has absolutely no problem with
hop or porpoising. The only problem is lifting the bow, now
I drive with Bravo I 32" and I'm wondering if extension boxes
would help for more trim level and more bow lifting.
Now, I can't trim enough to get the bow high!
Or should I modify the rear strakes for a higher bow level?
Any ideas?

Daniel - Switzerland

Re: boxes and xr's
 

Are you running shorties? a TG not carrying the bow? or High X. Boxes will help you leverage the bow no doubt. If not please install a 1 inch spacer in the drive for starters, and check the bottom for any severe hooks.

Re: boxes and xr's
 

Tres,
no I'm running stock Bravo drives 1.5. I tried IMCO 2" shorties
but loosed 4mph top end.
With the stock Bravo drive lenght and stock x dim, I have
to trim the boat to 7or8 on the gauge for best top speed.
Top speed in fresh water is 84mph.

Re: boxes and xr's
 

Tres, Did you do any bottom work on this this 2000 TG. It has a sticker from Martin Marine on the back by the drives. It also has Stelling Boxes and Bravos Drives and the bottom is very straight.

Re: boxes and xr's
 

ttt

So how did it do, adding the boxes and the blowers. Did it help the porpoising???

Tres rigged and set up my 2000 TG TS with Stelling boxes and fixed the bottom. It needed alot of work. Boat ran great. Not sure where that one ended up. It was all white when it left FL it had 500HP efis in it. I think it went to CA.

Randy,

The boat turned out great, and we couldnt be happier. With the new set up (box's, xrs, and blowers) the boat is like a whole new boat. It rides great and runs great. I kind of got a kick out of this thread when I started it. Everyone was talking about how it would porpoise, but actually it is the total oppisite. Im not sure if its just the way that Competition Marine set it up or what but its great.

awsome, good to here, the boat looks great rippen up the water, saw you guys go by shady gators 2 weekends ago, you going to be down this weekend, if so stop by i will be working on the cig friday night, and sat it will be at bergers for some new trick stuff

Randy we wont be down this weekend we got a wedding to go to but should be down everyweekend for the most part after this.