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33 Scarab AVS performance test ​​​​​​​

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33 Scarab AVS performance test ​​​​​​​

Old 11-16-2019, 10:52 PM
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33 Scarab AVS performance test
I have run this boat with full tank and 400lbs pass 28 p bravo props.

502 dead stock GM 502s 850 Holly carburetors. would Max out at 70 mph 5050 rpm

With 502 MPI's with mods on them they world would Max out at 73 miles 5150 rpm

Now I am Running 502s with Holly HP system and AFR 305 heads The boat has picked up a massive amount of power it runs 79.6 mph at 5700 rpm


I expect the boat to be faster. I am thinking of new props, aligning drives , tuning more, timing , Checking the boat etc. Any thoughts?
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Old 11-17-2019, 01:17 AM
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Not sure what is up with your set up, but it should be faster.
A friend of mine had a 33 AVS with stock 502mpi's and it ran upper 70's and he hit 80mph with shorty lowers.
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Old 11-17-2019, 03:16 PM
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2/3 tank 4 pass today with trim at 4 san Francisco
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Old 11-18-2019, 08:25 AM
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Like I told you in our conversation before, Ive seen 85.2 gps with mine at 700 feet above sea level, stock 500 efis turning 30 labbed props w 1.5 gears BUT boat is very touchy. Struggled to hit 82 w std 30s and took 30 or 40 seconds to get from 78 to 82 mph with them Boat ran 78/79 w 28s on rev limiter at 5450. Those motors as ran in my boat made 510 or so hp on my dyno when I pulled them, Smitty
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Old 11-18-2019, 04:49 PM
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What RPM at 85.2?
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Old 11-18-2019, 05:27 PM
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Originally Posted by cyrus77 View Post
What RPM at 85.2?
5550, turned rev limiter on 500s up 100 over stock, was still touching it once in a while, had stock 180 jr springs thpugh so fidnt turn it any higher plus it ran 84 to 84.5 most time, the 85.2 was best. Agsin though, with std 30s, was a pig and couldnt pull them well
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Old 11-18-2019, 09:49 PM
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Smitty, do you know who labbed the props? Trying to compile some prop shops and + results.
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Old 11-18-2019, 11:09 PM
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Originally Posted by articfriends View Post
Like I told you in our conversation before, Ive seen 85.2 gps with mine at 700 feet above sea level, stock 500 efis turning 30 labbed props w 1.5 gears BUT boat is very touchy. Struggled to hit 82 w std 30s and took 30 or 40 seconds to get from 78 to 82 mph with them Boat ran 78/79 w 28s on rev limiter at 5450. Those motors as ran in my boat made 510 or so hp on my dyno when I pulled them, Smitty
stock drives and any boxes?
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Old 11-19-2019, 09:16 AM
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Originally Posted by tmmii View Post


stock drives and any boxes?
stock 1.5 bravos, not xrs orshortys , labbed 30s, called partial lab when i spoke to bblades (bought them used). Only mod is I turned rev limiter up 100 rpms on motors. Raced a local guy with same boat with 540s, he was running standard 30s, I could beak him by about 1/10 mph. My boat hated standard props FWIW
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Old 11-20-2019, 06:52 PM
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Originally Posted by articfriends View Post
stock 1.5 bravos, not xrs orshortys , labbed 30s, called partial lab when i spoke to bblades (bought them used). Only mod is I turned rev limiter up 100 rpms on motors. Raced a local guy with same boat with 540s, he was running standard 30s, I could beak him by about 1/10 mph. My boat hated standard props FWIW
did bblades lab yours? Im putting mine together this winter and not sure what to do with props yet. I am going to be running stellings extension boxes that will raise the drives 2. From the people Ive talked to it will still like 4 blade bravos the best.

Sorry for the hijack.
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