496ho with a Whipple
 

I have a 2003 Sonic 260 with a 496ho & a Whipple Supercharger installed. Just wondering if anyone else has done this on there boat & what speeds that they are seeing. On GPS I am running 73mph. Does this seem right to you guys?

Re: 496ho with a Whipple
 

I have a 1998 26 prowler with 502 and minor engine upgrades with bravo1 4 blade labbed 24 p and run 67-69 gps have hit 70 gps with 23p mirage plus labbed prop?

Re: 496ho with a Whipple
 

how much boost are you running?what kinda prop?last years set-up i was around 70 at 4500 rpm's red lining at 6000 with 7 lbs of boost,that was with a labbed 28 bravo-1.

Re: 496ho with a Whipple
 

Prowler ,What set up are you running with your unit

Re: 496ho with a Whipple
 

Prowler,
I am running 5lbs. boost? a 25p labbed hydro & turning 5200 rpms. What motor are you running?

Re: 496ho with a Whipple
 

Sounds like you may be on the rev limiter. I would try a bigger prop, I would expect you to be faster than that.

Re: 496ho with a Whipple
 

Know of a guy with a 26 with a 502 mag w/procharger M3 If I remember correctly, standard boost level/pulley, running a 28 B1 and running low 80's in right conditions. He also ran a 28 hydro, but it would blow out alot, however a little faster on top end with the Hydro, holeshot was awful, as was midrange cruise.... in 2' chop it would blowout & fall off plane occasionally under 3000. With the B1 28, no more issues, in fact mid range cruise speed was up with the B1 over the hydro.

Re: 496ho with a Whipple
 

i tried a hydro,still hanging on the wall,didn't like it,the prop felt heavy,thats a 29 pitch,spun that 5400 rpm's,best was either a labbed 27 3-blade,6200 rpm's i guess tach only goes to 6 and i was past that or a labbed 28 bravo-1,i don't think the prowlers like hydro's.do you have a boost gauge?i see you have a ? mark after 5 psi.last year i was running a innercooled 250 powercharger over the winter i put a 420 mega-blower on,the block is bored and balanced,heads flowed,bassett headers a couple of 850 holley's,full roller motor.Brian C you didn't say if your exhaust is stock or not,if your putting it in you have to get it out.

Re: 496ho with a Whipple
 

i'm looking to get 90 mph out of it this year,almost there.

Brian C where ya go??????where do you boat?

Re: 496ho with a Whipple
 

Prowler,
I do still have stock exhaust, Whipple said that stock exh. flows pretty well & to not worry about changing it. I am running 5lbs. of boost. I took it out this weekend just to besure that that number was right & it is. I do my boating on the Potomac River in VA. It sounds like your boat is the real deal. I would be happy with just running 80mph. What gear ratio are you running in your lower?

Re: 496ho with a Whipple
 

Brian C,i'm running stock 1.50 ratio,if you can try a merc prop 3 or 4 blade,maybe a 25 3-blade or a 26 4-blade for starter's,like i said i didn't like the way the hydro felt,dave

Re: 496ho with a Whipple
 

Re: 496ho with a Whipple
 

Thanks for the input guys. I'm talking to Julie at Throttle Up & we're going to try a different prop & see what happens.

Re: 496ho with a Whipple
 

Brian C,did you remove the restictor plate's out of you exhaust,between the riser and the manifold,in the tech section guy's have done that and picked-up a couple of hundred rpm's.dave

Re: 496ho with a Whipple
 

Yep, I sure did. It was part of what Whipple wanted done in the install. I'm thinking about going ahead & getting a set of headers for this thing. Like you say it needs to breath.

Re: 496ho with a Whipple
 

Brain C,can you post a pic of your boat and engine?like to see it,dave

Re: 496ho with a Whipple
 

Dave,
I'll see what I can do. When it comes to me & pics on the computer I seem to have problems.

Re: 496ho with a Whipple
 

I have a 2004 260 Prowler w/ a 496 HO also, but am getting only 62 to 63 out of her. It is running on the 4 blade 22 P that came with the boat, and wondering about recommendations to step up to a 26 p 4 blade. A buddy of mine recommended it, but wondering if anyone out there has any more recomendations for prop set up without engine modifications? She also only has 14 hrs on the motor at this time too so I am sure she is not quite fully broken in yet. Thanks, Pete :cool:

Re: 496ho with a Whipple
 

Re: 496ho with a Whipple
 

jlsnyder26_Sonic,

I'm turning about 4900 rpm with the 22p 4 blade on my 26 Prowler. Thanks, Pete

Re: 496ho with a Whipple
 

Re: 496ho with a Whipple
 

Thanks for the info JL. I appreciate it. Pete :cool:

Re: 496ho with a Whipple
 

Sonicblaster, I have a 2001 Prowler with a 502/415 HP, turns the 22" Bravo 1 5000 RPM with a speed of 63 MPH. When I run my 24" Bravo 1 RPM of 4700 with a speed of 63 MPH (better cruise speed,worse planing). Sounds just like my boat as far as performance. Steve

Re: 496ho with a Whipple
 

steve, i can't beleave it you said how fast your vessal is!what you gave up on trying to call me??horses,boat,very busy,but hay i've hadn't had to cut the lawn,the horses do that :D ,dave

Re: 496ho with a Whipple
 

oh the daul ram external steering i put on steers earier now then it did before,very light on the steering wheel,before it was like it had very little assist,dave

Re: 496ho with a Whipple
 

Steve,

Thanks for sharing your info on your 01' Prowler. I don't feel so bad now with my speed. Thought I would at least hit upper 60's with a 496 HO 425HP motor. Pete :cool:

Re: 496ho with a Whipple
 

I have a 2001 26 Prowler with a 496 HO and a 24 4 blade. best I can do on the gps is 61. Any ideas? It is turning about 5050 rpm,s on the tach.
Thanks

Re: 496ho with a Whipple
 

I have a 260 with a 502 mag and 63 on gps is it. I am thinking about a whipple but I would need to upgrade the outdrive. Seems too expensive for a few mph

Re: 496ho with a Whipple
 

well knock on wood, i've been running the same drive with a supercharger for about 5 years now,just don't hammer on it and change the drive oil often.dave

Re: 496ho with a Whipple
 

a few mph,hmmmmm i added 20 something mph over you guy's,you don't know til ya try it.dave

Re: 496ho with a Whipple
 

How much does it cost to get the whipple installed?

Re: 496ho with a Whipple
 

26 Prowler i think could almost spin that prop we were talking about,try'd to pm you,no good,try'd to e-mail you no good,talk to me steve won't,dave