1988 scarab excel question top speed
 

http://i1044.photobucket.com/albums/...o/DSCN0295.jpg hello all new to site.
i have an 88 28ft excel it has a zz502 crate motor with 500 hp with stainless marine exhaust holly carb and pump with a 08 bravo drive with 4 blade prop ive own the boat since aug last year now and love the boat . i just feel i should be getter better topspeed the fastest ive been able to go is 66 mph and that was with only 2 people on board. should i be going faster is there something i can do ??? i dont want to chage to a 3 blade if its not going to make a big diffrence


thanks for the help

454 \ 365 hp - 59 MPH (Stock)
454 \ 7 lbs boost - 70 mph
540 \ 7 lbs boost - 80 MPH

PS - our boats look identical, even down to the decal only mine says Bowtie racing.

Love the 28' Excel. Nice boat.

thanks ill post some more pics soon i think i need a diif prop will switching to a 3 blade make a big diffrence with top speed?

I have a 1990 31ft excel with stock 454's 365hp. I can't remember what the pitch. I want to say 3 blade Mirage 25's.

In any case I'm hitting between 62-65 mph 2 people with half tank of gas. And thats on GPS.

What pitch prop are you turning and how many rpms was the motor?

I believe they are 23's, and I was humming around 4800 rpm

I bet you a tweaked 23-25p 3 blade would get you just about to 70.

when I got my excel 3 years ago it had a 3 blade 25 pitch prop which was totally wrong for the boat, should of had a 23p 3 blade with the 454. Anyway, my boat could barely get on plane with out the prop slipping so I think I would stay with the 4 blade.

i have a 28 excel that i just took for a test ride. i put a mild efi 502 with ke exhaust and am turning a labbed 24, with no trim (lines were backwards on trim pump) i only hit 64mph at 4800 rpms... i will be tryin other props and i switched my lines today...