Imco Drives on SR-1 Formula
 

I'm going to do some upgrading to my drives this spring and I'm looking to get some advise. As of now, I'm running the blunt nose bravos ('89) on my Formula 292 SR-1. I'm not experiencing any blowout yet but I know I'm at the limits of this drive. Currently I'm getting 71 mph GPS with my boat, and last summer I had it tuned VERY conservatively, so I am sure I can get a few more MPH this summer with a more aggressive tune. That said, I want to upgrade my lowers. I've been looking on this site for a couple years to see if anyone has installed -2 imcos on either a 292 or a 311. Lots of talk about it, but I can't find anyone that has done it. So with that said- does anyone know of anyone that has put -2 drives on one of these two boats or a similar hull?

Now with all that said- does anyone think I would see any improvement with a standard length IMCO vs my old school bravos? I know the case is longer, so that is going to create more drag, but the imco is also streamlined which may negate that. I've also been reading that some guys have sharpened them and sanded them with 600 grit to further reduce drag and improve the speed. So drive experts, what are your 2 cents on this topic?

My .02 is if you're going to buy the IMCO lowers, go ahead and buy the -2. If they don't work, its easy to put a spacer in to get it where you want. Its not easy to go shorter if you get a standard length. Most boats pick up a couple mph with the IMCO lower due to the nosecone, but I don't know specifically for yours.