It definetely robs alot of speed. Or at least thats the feedback I have received both from my own experiences, and that of others. IMCO will know best, and you guys should call them. Please keep me posted on anything you guys come up with.

defyn,

Can you elaborate a bit more on what your finding were on the xr drive gears. I am having xr put behind my 500 efi's with the plan to whipple them next year after my warentee. Please explain for me what info you gathered.

Thanks

MPH 120 , I will be using TOTAL MARINE AND PERFORMANCE, in Slidell LA 1-985-649-9888 WHAT A GREAT PLACE, EDDIE AND STEVE ARE THE OWNERS THAT I HAVE SPOKEN WITH AND DO ALL THEIR OWN WORK. They sell both IMCO and Bmax drives and everything that you have explained to me they feel the Imco is a better choice in my application, Robbies also with his PowerPlay. They themselves have a boat with 750hp over 200hr on just the single motor and std Imco, not the sc, the weight is around 7000 pounds and they hammer the **** out of this drive and cant blow it up, the speed loss I feel is going to be more than 7 or 8 hp loss, the bottom end is the same, and the price is better, but no warranty sucks, and I still have to check out the deal with the gears. I will also today try to do some investigating.

Jassman,

I have heard of these guys, but have never used them. I do know their boat, that SOB runs. Everyone says their work is great, and reasonable. What is their price on the SC, and what do they think about the two? Where is robbie from?

Mph120, Funny that you asked, he just called me 2 minutes ago to see how my trip in Pompono was and which drive I wanted, I told him the sc with polished lower and 1 1/4 , he is getting back to me on a price. I allready today got a great price from Mike (goodfella) from Dollar Offshore, I will get back to you.

I did call Imco today, talked with Rick, who was very knowledgable, they do use the xr gears, but that is not the problem, its the slop around the gears that have to be contained, which they have resolved, along with quite a few other issues that they have handled. I personally feel its not as durable as a bmax which is better suited for the heavy Black Thunders, Nortechs, or boats of such, and Im not willing to scrub off any speed like 5-8mph. (see previous posts) The bottom effeciecy of this THUNDER with some common driver sense and 85% ratio as good as the bmax, I feel that this combo also being less expensive is the way I am going. Finally done with this shtuff.

JJ,

Is that slop in the gears an inherent problem in a stock xr application?

its common, all these other drive guys, Imco, bmax, Teague, have found ways to improve an allready good drive (xr) and just make it better through testing and reserch. They all have their claims to having the best, some better on the lowers, and some on the 5" upper gear set, one sucks up to much hp but is very reliable. To me its been a pain in the ass, this is suppose to be enjoyable, your damn if you do or dont. I am going with the Imco Extreme SC polished, with 1 1/4 the big one (like my wife says) enough screwing around. The bmax is better, but more money, drags and sucks valuable hp, different gears, and is really for the guys that have heavy applications like Nortech, Black Thunder, Sonics, where weight is an issue. We dont have that problem, we have the most effecient bottom anyways, we have hammered the boat for 80 hrs with twinn 500efis and still cant blow the std bravos up, thats got to tell you something, Im done, CAPECH!!!!!

Si, mi amigo

The upgrade is only a mere 2500. per drive including tax and shipping, give or take a few bucks, the best Ive gotten so far.