looking for speed
 

looking for prop information ,,, i have a 2001 29ft scarab twin 5.7's mpi ,,, wondering what max speed i should be able to run and a good cruzin'speed ,,, what's a good cruzin RPM to run?

I would assume they are the 350 MAG MPI's, which is 300HP each, and you have a BravoI setup? I dont have the Scarab, so its not completely apples to apples, but my hardware is as above (ive got a 28zx). My props ar Mirage Plus 23's. I run 71mph with it. I would think your performance would be similar (or better) provided you have the 300hp motors.

TOP Speed
 

IMO, I would say 66 or 67 mph Top Speed GPS.

shag, what rpm's you turning. i have 350's with dart heads LT1 cams alum GLM exhausts. i hear the boat is good for 63 at 5200 rpm's. i haven't got it in water yet since i got it back. 23 mirage plus. alphas. 27 Nova III really a 26 with molded platform. doubt it could match your Donzi if everything else was equal...

5100... Hitting the rev limiter in ecu. What Dart heads? Im looking for HP myself. Thinking of Dart Pro1's along with their single plane intake, set up for mpi.

they are the cheapie Dart heads. 007 sportsmans with 76 cc chambers and 1.94 valves. and i just found one cracked when i took it to get a really bad valve guide done. i am stuck with an old spare pair of 624's for 1 motor for now. if spending good money, go aluminum. better everything plus another 100+ lbs out of the back of the boat..

hey guys ,,, have a little information, 2001 29ft scarab, twin 5.7's, bravo 1's, mirage plus 23's, 100gal tank,,, 2 people, 3/4 tank fuel, 4900rpm, wind just right 68mph GPS,,, run 65mph easily,,, I cruise 4000rpm, 55mph,,, been told PowerTech props are a very good choice, talked with them and was told they wouldn't change anything,,, said i'm buying spare set anyway what would you suggest ,,, they ask how it plans out, told them fine, it sometime trys to blow out, but very seldom he suggested OFX 3 blade 24p props ,,,,, wondering about 25p or OFX4 blade ,,, would like some input from ya'll ,, i know cars but just starting with boats

hey Shag555 ,,, is your speed GPS , most i get is 68,,, 65 all day,,, they are 300hp,,,

[been told PowerTech props are a very good choice, talked with them and was told they wouldn't change anything,,, said i'm buying spare set anyway what would you suggest ,,, they ask how it plans out, told them fine, it sometime trys to blow out, but very seldom he suggested OFX 3 blade 24p props ,,,,, wondering about 25p or OFX4 blade ,,, would like some input from ya'll ,, i know cars but just starting with boats[/QUOTE]

You are one of those people that ask for advice , get it then won't apply it . So why ask in the first place ? :confused:

well i guess because i'm new in this, dont have tons of money to take the first advise i get,,,, i do like to hear from several people with first hand experience with there on boat,,,, thats what this forum is for ,, Right ? ,,,, thanks for ALL information and opinions

This is about how my boat runs. I think once you gain some experience with it, youll figure it out, then you can start playing in modding it out. As I stated before, I'm in the same boat (just a different hull).

Get in touch with BBlades and try their prop enchange program. Every boat hull and power combination reacts differently, even boats made by the same manufactures same size etc. Every boater carries different loads, hulls aren't exactly the same, hooks etc. so every boat needs to be dialed in with the right props. Even then you need to find a happy medium to a point to adjust for top speed, getting on plane etc.. You need to know what max rpms are for your engines and cruise should be aprox. 75% of that. Question is, can you reach max rpm or do you exceed max rpm under normal WOT conditions? Can't reach, too much prop. Exceed, not enough. Roughly 200-250rpm for each degree of pitch up or down is a good rule of thumb. I'm far from an expert and I'm sure there are others on here that can give better advice. This is my 2cts worth and what I have learned. The more information you have on hp, rpms, load etc can help you get a starting point and go from there.

thanks fireboatpilot, information will be remembered and used,,, max for my engines are 5000, your factors tell me 3750 is cruise, i did run an hour stretch with a few bigger and faster boats,,, my cruise was 3700- 4000 .... sometimes 3700-3800 sometimes 4000 back to 3900 and so on .... the boat did feel and sound comfortable their...... in your opinion, where is the most economical place to gain torque ?

performance
 

has anyone ever heard of or used Dyno-Boost Boat Performance Chip

Yeah, about $3.00 worth af radio shack parts soldered into a crappy case. If you would like to purchase a Flux Capacitior from me I have one for sale. Once you hit 88 MPH, you will beat everyone to the dock:lolhit::lolhit::lolhit:

Sorry, that was a bit sarcastic.... IT is a total Scam.