Correct , no pulley change. What I'm sayin is the 25hp gain woulda have been smaller if you didn't have the core obstructing airflow thu the manifold.

I personally wouldn't mind seeing these 100hp claims from adding chillers backed up with some proof. For example, a typical summer day on a inland lake. 90* air temp, 80* water temp flowing thru the chiller. Sustained wot, where the core itself is subjected to the heat of the compressor( unlike a dyno pull) . I'd like to see the IAT temps. It would also be cool to see the difference of power output of say a small highly overdriven roots setup, and a large under driven roots setup.

I also don't believe Nickerson, that by bolting chillers on, keeping the boost at 8psi in the manifold, nets 70hp gain. Maybe if you upped it to 10psi

I was just on Wallace Racing website using the boost calculator and figured out that i should gain 34 hp per additional pound of boost which should give me an additional 68 hp by installing coolers. You gain 2 pounds of boost with chillers by using a smaller blower pully to maintain the 8 pounds of boost i already have , not to mention a couple more degrees of timing i can run. I will let you know how this works as i am going to add the chillers this winter and test next spring. I should be over 100 mph anytime, i want and still run 93 octane, thats the goal! As far as my Bravo One drives are concerned i want to see the speed first and buy Imco's if it works. I've been running these drives for 12 years with 700 plus hp all this time with minimal problems. I just make sure the drives stay in the water at all times and avoid jumping out of the water. Going in and out of the water and putting a huge load on the drives when the props get back in the water at speeds seem to be what tears them up. I've had quite a bit of experience doing this with too much hp ahead of Bravo drives and the cone clutches seem to be the biggest problem. Oh well i'm going to try!!!

You don't gain 2psi from installing chillers. If your at 8psi now, and you bolt chillers on, you will probably be at 6-7psi manifold pressure. Yes, a smaller pulley is needed to get back to your original 8psi, because of the restriction of the core and denser charge.

To gain the power you mentioned(68hp), I think you will need a even smaller pulley, so you see 10psi of manifold pressure.

What are your current pulley sizes? Top and bottom pulleys

I believe my current pully sizes are 6.25 lower and 5.75 upper, I have a set of 5.4s which should put me right back to 8lbs after I put the coolers on. I will run 110 gas and see where I end up without causing damage.

Gotcha, so you're about 8% over right now, and you'll be going to 15% over with the 5.40 Pulleys.

Can you toss in some 110 now and bolt the 5.40'' pulleys on and see what it does with the extra boost?

That's sweet! Just add 110 and a smaller pulley, better being safe than sorry!

If we are placing bets I have $2 you will go faster no chillers and the 5.4" pulleys on 110 than 5.4's w/ chillers. This would be great real world testing.