Hey Jason & Johnny, Wonderful explanation involving the 3.8L Whipple for this non-wrenching boater.....I've been to your place a couple of times just to browse while boating up on Queen of all the lakes!
I have a '82 35 Cig .... 572 tall decks with dated AS&M efi's rigged in '96 by Flagship Marine in Fl. ....being N/A engines pushing 650 hp apiece....you got me interested in the 3.8L ....short answer, do I have
the starting groundwork for a better than 65 mph boat?........no doubt it takes a phone call to discuss and lots of ????...but really engaged with this thread!....op sorry for the hijack!

Hi Scippy,
The short answer is yes. Give me a call or shoot us an email
518-644-3080
[email protected]

Where is the performance report on this??
We need an update.

Highest of 94 so far. Playing with props and drive heights. Still very high slip numbers. Mike ordered a Maximus last night actually

Don’t forget to add I’m changing lowers. We’re on the fast track to 100 now, we’ll get there.

Kellucca,

How does the boat behave at that speed? I've been told my PQ280 will chine walk at 80-85, and I can't think of why a Checkmate would be much different. Just curious.

Thanks. Brad.

I will tell you that you don’t want a lot of boat traffic and cross wakes. It loves trim and when you get it up on the pad good it’s not too bad. This dual downshaft IMCO lower is an anchor. Just ordered a regular-2 SC to put on her. Verified testing on another boat shows a whopping 9-10 mph difference. I’m thinking the lower gear case is just so big that prop is in dirty water and has high slip and is “searching”.

The Check has a pad which a good driver can balance the boat on. I believe the PQ is a traditional Vee. They'll handle quite different at high speed.

TeamSaris,

Yup. A single stepped vee, no pad. Our PQ280 will start to chine walk, ever so slightly, at about 75, but I have learned that I can drop the left trim tab a bit to counter it, leaning against the RH rotation prop torque, and it will settle out. We only notice it in relatively calm water. Any traffic chop and it has more of an influence on the behavior of the boat than chine walk factors do.

How wide is the pad? Curious....

Thanks. Brad.

even with a straight V, assuming you have hydraulic steering, steering wheel input can usually tame chinewalk. I try and run as little (usually none) tab as possible for high speed runs in boats of this size. Just seat time and wheel input. We have a client with a 28 Pantera ive run well into the 90s...going for 100 this fall. You have to "drive" the boat, but its more than manageable. Most boats are unless the setup is far off. My Kryptonite has a 6in pad. It takes wheel input to keep it on the pad, but it runs over 100mph.
In Mike's case, he cut his teeth in a Hydrostream. If you can hang a stream on a pad, you can drive any V there is.