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03donzi18
03-15-2009, 07:27 PM
was wondering what i could do to get more top end speed i have an alpha drive and a 21p mirage wheel any help would b great thanks

Just Say N20
03-15-2009, 07:32 PM
In order to answer that question, it would be helpful to have some information about the current performance.

What RPMS are you turning?

What is the GPS speed you run at maximum RPMs?

Where do you boat (its an altitude thing)?

Do you know the gear ratio of your outdrive? (1.5:1, 1.65:1, etc)

Mr X
03-15-2009, 07:38 PM
The hull type helps too...:biggrin.:

smokediver
03-15-2009, 07:58 PM
i am gonna guess a 2003 18 !:biggrin: and if he is turning a 21 probably the 1.47 ratio or 1.5 now .... lab finished prop is a easy few mph ... maybe switching to 1.6 roller rockers might get 1 or 2 ... I was wondering how the computer would handle a mild cam change and the new small port bowtie vortec heads .... they have great flow ratings compared to the older vortecs ...

03donzi18
03-15-2009, 10:18 PM
its a 2003 18 classic and i turn 4500 to 4600

03donzi18
03-15-2009, 10:19 PM
where can i get a lab finished prop and what is it

Donziweasel
03-16-2009, 06:29 AM
Labbed prop is perfectly balanced, shaped and wieght tolerances are within very tight specs. Gonna cost you though. Pretty big money for a labbed prop. Can go well north of a grand.