ur2slow

Whats the thoughts on speed for 2003 Fastech 382 with 500's boat has extension boxes. Thinking of upgrading!!!!

t500hps

I moved from a 312 (502's) to a 382 (Procharged 500's). Loved the extra room/ride but you should know it's more like an Excursion vs the Mustang. I sold the Prochargers and built 540's and still ran in the mid-upper 80's (95+ with the Prochargers). What your considering will likely be a 74-76 mph boat on a good day. I say go for it!!!

QuarterFlash

I have a 99 382 with boxes and I get about 77 gps in fresh water on a good day by myself with just enough gas to get back to the marina. I am considering upgrading to something faster if I can fnd a home for mine and something with 700's

jeff32

how many hp were your 540 again?

t500hps

dyno'ed 630hp/700tq fully dressed (seawater pump to my CMI's) spinning labbed 30's to 5,650 rpms. However, I usually ran labbed 32's or 28 full size maximus pulling 82-83 at 5,300. Reason: 3,500 was 58 on GPS!!!

BONDO10

ur2slow
clear your pm box.
My 382 with 525's can be bought for less then most 500 boats.
Jeff
[email protected]

BTW my boat will run 71-73 loaded with a/c,genset and 4 adults 3/4 tank of fuel.
73-75 lightly loaded

J.B. Marshall

Bondo my buddy has a 2003 w/525's and he runs 81-82 mph. mine w/500EFI's runs 72-74
What's up with your top end? What props and RPM's are you running.

jeff32

why did you get rid of your blowers ? ''blown engines'' problem I guess?

I think you are always better having a, let's say, 650 to 700 HP narturally aspirated engine, instead of a , for example 500's with blower putting out 650 to 700 hp...

How much was the cost of your 540 - 630 hp vs the cost of blowers
?

t500hps

I bought the boat with 8 PSI Prochargers. Procharger claimed 830hp but my engine tuner said he usually saw 790 out of that set up. Problem was the engines were "hurt" when I bought the boat. I babied the boat til fall then decided to pull them apart. Fuel burn was terrible and it left the transom black after every run. Some buddies were going to help me build motors and we decided to go back NA but with internal changes.

In hindsight I should have refreshed the engines and had them re-tuned to try and get the rich fuel issue under control. With us doing everything but boring the block I still spent over $20K....but offset that some by selling the Prochargers. Heads, cam, crank/rods/pistons, even the fuel system had to be replaced. What really SUCKED was the injectors had been upgraded so we used them.....and 2 hours after running the engines one of them "blew up". Turns out 2 of the injectors weren't firing at WOT so another rebuild was required.

BTW: The boat ran 98 with the Prochargers

BONDO10

J.B I was posting average top speed. I have seen 76 a few times but don't usually keep it pinned for the last few mph's. My boat is loaded with a/c and genset. I almost always have a full water tank and fill the fuel every time we go out. I have never heard 81-82 out of a 525 382.What is his set-up. I run labbed 28's from Brett at Bblades.