29 scarab speeds? what do you do?
 

I am looking to get a idea on the speeds of 29 scarabs with twins. Please tell me what you have , engines , mods , drives , props , tabs , yadda yadda. Thanks in advance.

Re: 29 scarab speeds? what do you do?
 

85 Scarab II stock 375's 23p cleavers got it to 65 on gps with no fuel and just me driving ....... :(

Re: 29 scarab speeds? what do you do?
 

I've got a scarab 29 2000, tw 350 300hp with standard mirage 23 , running 66 mph in soft water at 4900rpm.

I wiil try mirage plus 23 and expect 68 mph

Frank

Re: 29 scarab speeds? what do you do?
 

Frank the only thing i can thing of is my boat weighs alot more ....i am only running 4500 rpms i am disapointed i want more speed :evilb:

Re: 29 scarab speeds? what do you do?
 

twin 375 or single

If you have a single 375 its pretty good

But if yo have a twin :(

Re: 29 scarab speeds? what do you do?
 

With twin 350's on a 29 Scarab from around mid 90's till 2000 you should be doing on GPS around 68 at 4800rpm.

Re: 29 scarab speeds? what do you do?
 

Unless the 350's are 377's with blowers and blackhawk drives, then it's a scary 90+mph ride...................

Re: 29 scarab speeds? what do you do?
 

I agree around 68 to 72 depending upon conditions.

Re: 29 scarab speeds? what do you do?
 

Frank twins here i know i need more speed :evilb:

Re: 29 scarab speeds? what do you do?
 

I'm just trying to ger a handle on how I'm doing performance wise with my 94 29. I'm running carbed 350 mags , alphas , 23 pitch laser 2's , 61 mph@46-4700 r's on the gps. My bud has a 96 with mpi's , bravos , 23p mirage plus's and runs like 68 on the gps @ 5000. Guess that is right with the equipment I have. Thanks for the replys! :evilb:

Re: 29 scarab speeds? what do you do?
 

have you tried the next size down in pitch or slightly smaller diameter props? You should be turning about 4800-4900 rpm's. It should give you an extra 1-2 mph.

Re: 29 scarab speeds? what do you do?
 

I am working with Julie at Thortle Up now to see what i can do

Re: 29 scarab speeds? what do you do?
 

i was running 66/68 depending on conditions w/same set up before the blowers.I have 23 mirage props.

Re: 29 scarab speeds? what do you do?
 

1999 29 Scarab with Twin 350ci / 300HP - (GPS Speeds)

68.01 with a full tank and two people before I had my props re-done. With the props cleaned up 70.06 (GPS) 1/4 Tank and two People.

Re: 29 scarab speeds? what do you do?
 

Which props are you using ?

I'm at 66 mph with 23 mirage , not plus...

Re: 29 scarab speeds? what do you do?
 

14 5/8 x 23 Mirage - "OEM" Props. They had a few large dings in them when I got the boat so I sent them out to be cleaned up, No major work - just cleaned up. The engines are stock, I think? I bought the boat from a repo yard and have no history on the engines, I belive they are both stock.

Re: 29 scarab speeds? what do you do?
 

In salt or soft water

I don't know if it's true to think about 2 mph gain in salt water?

Re: 29 scarab speeds? what do you do?
 

Freash water. Lake St. Clair, MI

I have read that people are getting 72mph with a stock set up! I'm not sure how that is, the best I have got was 70.6 - and that way down river, wind at my back, light fuel and light wife!

68mph is pretty much an everyday number.

Re: 29 scarab speeds? what do you do?
 

Your right,

i will try Mirage plus 23 this week-end
I will appreciate 70 , but who knows ?

Have a good summer

Frank

Re: 29 scarab speeds? what do you do?
 

Let me know how it works for you.

Re: 29 scarab speeds? what do you do?
 

My 98 29 with twin 350 mpi motors stock ran 68@5000rpm's (GPS) with 23 pitch 3 blade mirage plus props. Full of fuel. The only other mods are stainless marine exhaust and K&N filters. Then I added pro-chargers and switched to 28 pitch 4 blade bravo 1 props running 5 psi boost and have seen 80 every once in a while when conditions are pefect, any other time 78 @ 5000 rpms.
It ran a little faster with three blade props but was harder to control.

Re: 29 scarab speeds? what do you do?
 

Finally i've tried bravo 1 , 22 pitch , real real bad , 62 mph at 4800 rpm, but 45 mph at 3400trs, and hard on fuel !!!

I can't wait to try 23 plus

second post
By the way Tssteph,80mph WOW, how did cost all your mods , and is it reliable

Thanks

Frank

Re: 29 scarab speeds? what do you do?
 

I have had zero problems in ywo seasons. It was the best money I have spent. The cruise speed is awesome and the economy at cruise speed if awesome.

Total cost, I don't want to think about it.

Two pro-charger kits Call Rob at RW Marine for the best price
Traded props, no cost
computer reflash $450

Re: 29 scarab speeds? what do you do?
 

Do you have any pic's of the install, did you charge your steering? I figured 67/70mph would be fine but after 15hrs of boating I'm way bored with it.

On a side note on of my fresh finished props had a nice "dent" – after it came back from John’s Prop shop I was able to find my lost rpm/mph – Back to 68.7mph with a ½ tank full cooler and wife.

The more I drive the 29 Scarab the more I like it! - My hart was set on a Sunsation but I could not pass on this deal. But I sure was grinning ear to ear this weekend when I ran down and passed a buddys 288 (502Mag) in some pretty snotty water. :evilb:

Re: 29 scarab speeds? what do you do?
 

Mine has hyd steering already, came that way also has 280 tabs. I did the install myself, read a lot on here and spoke with some people prior to starting the install. Learned a lot of the do and don'ts. Install was fairly stright forward. The only real hard parts are the fuel connections and only because there is just not much room in these boats.

Re: 29 scarab speeds? what do you do?
 

Did you ever start a thread about the install, were you purchased them from or fuel line routing?

What year Scarab do you have?
How many hours were on the engines before you "charged"them?
How many hours have you run the charged engines?

Sorry for all the questions, but I would really like to install a set - Dollar $$ for dollar them seem like the best performance gain.

Re: 29 scarab speeds? what do you do?
 

98 model 350 mpi motors, 142 hours when installed, I would guess at around 180 now.Mark at Percision marine did the reprogram for me, I bought the chargers from RW Marine, no one could beat their price, kits were drop shipped from ATI, I installed boost and fuel pressure gauges at the same time, all supplied by ATI. The only issue I had was one weak factory fuel pump. Come to find out there was a TSB from Mercruiser on it. ATI support worked with me to figure out the problem, also having twins and being able to swap parts from one motor to another helped as well. Mine are setup on the easy side, 5 psi and stock timing. I like the cruise speed of a little 53 mph at 3000 rpm. I use less fuel now when cruising then I did prior to installing the chargers. I really don't think there is a better bang for the buck for a stock motor mod. I like mine and will do it again on the next boat, whatever it is. Let me know if you have any more questions.

Re: 29 scarab speeds? what do you do?
 

Whats your top speed now? Also what brand of external hyd.steering do you have?

Re: 29 scarab speeds? what do you do?
 

80 in perfect conditions with 4 blade Bravo 1 28 pitch props. Lathan hub with Imco setup at the rear. Takes some driving and getting used to, you have to work the tabs a little, was a little faster with three bladed but took more driving and the cruise was not as good. I can run 77-78 everyday with full load of fuel.

Re: 29 scarab speeds? what do you do?
 

I had a 28 Scarab with a single Franks Marine big block engine and a brovo drive. Top speed was 93 MPH. It was a Larry Smith step bottom hull with a full canopy. 93 MPH is exciting, but I must admit the ride was nicer and lots less stressful down in the 70 MPH range.

Re: 29 scarab speeds? what do you do?
 

I have an old 30' 79 scarab. Two 540ci. bbc., TRS no steps, 5800rpm, hdromotive 26 quad round ear props. We consistantly see 90 . No blowers for me.

humpster
 

guy at procharger said no computer work had to be done on the twin 350's true or not true

it is not required but will help it run cleaner and more efficient. Mine ran cleaner after the procharger install then it did stock. Mark at percision marin did both of mine.

hi there I saw you put prochargers on 350 how much hp now and what is the fuel consumption .

best regards,
ivan

I have a set for 350 small block's if you are interested

Engines vent.
 

Dears,

Where can i found engine vent. For my scarab 29.5 racing ?