3.3 whipple on 575 SCi
 

I'm wandering if anybody has tried mounting a whipple blower and intercooler on top of a 575Sci? What would be required and how much reliable horsepower would there be?

Re: 3.3 whipple on 575 SCi
 

Why would somebody make a major component change like that to a $45,000 Merc blue blower motor?

Without getting into an argument on the pros and cons of a Whipple, a 575SCi is a damn expensive motor. If would make FAR more sense for somebody to Whipple a 500efi, than to bastardize a 575SCi like that.

The bottleneck on a 575SCi is the fuel injector sizes. Only good to around 700 horses. And they are port injectors. Whipple likes you to swap to throttle body injection which would FURTHER require throwing good parts in the can.

But if you're dead set on putting an entire Whipple top kit on a 575SCi, then you basically end up with a 500efi with a Whipple on it. Only difference is that the 575 as a milder cam and lower compression than the 500efi.

In my opinion, you're MUCH better off to trade the 575SCi's for a pair of 500efi's and Whipple 'em. You oughta come out ahead money wise by a long shot.

Back to the original question regarding horsepower with the Whipples? Probably 750 ish if set up for pump gas.

Re: 3.3 whipple on 575 SCi
 

You're right but the boat has 575's and i want more power than stock blower can produce.With 7.5 vs 8.5{?} to one compresion wouldn't the 575 be way more reliable than the 500efi at these elevated power levels? {700-800hp}

Re: 3.3 whipple on 575 SCi
 

What about adding an intercooler, changing the pulley and reprogram the ECU. You should get to 700 HP or so.

Re: 3.3 whipple on 575 SCi
 

Thats a good option.Whipple's kit makes 650 hp. Does anybody else make a reliable kit in the 700-800 hp range?

Re: 3.3 whipple on 575 SCi
 

Sorry mcollinstn, this is the first time I've got to disagree with you. I feel the Whipple 3.3/ intercooler would make a great upgrade for the 575 SCI. Presently, I've got 2 of them apart for a total rebuild. The 256 Weiand's are at The Blower Shop for rebuilding. They were a mess.

The 575 SCI is not port injection, it's just a plain 'ol Rochester throttle body x2 (just like a 454 dump truck)

There are quite a few of the 575's out there that are in need of rebuilding and this would make a nice upgrade.

Sure would be interesting to see an apples to apples comparison between the 'ol roots and a screw type compressor.

Kurt

Re: 3.3 whipple on 575 SCi
 

If I had to have the blowers rebuilt on my 575 EFi's, I would replace them with the Whipple's instead.

Biggus, why don't you do it and let us all know how you like it. :D

Re: 3.3 whipple on 575 SCi
 

Actually, if we could start all over in this project, I would have chosen Vortech blowers with R-tech Supercoolers and made a reliable 850 hp....but then the drives would be an issue :D

..I wonder how fast a 30 Mystique TS would run with 1700 hp!

Re: 3.3 whipple on 575 SCi
 

575sci can make the 700 HP you want, pulley, ecu, intercooler; but i agree with some of the others, if the blowers are due for a rebuild, i probably would go whipple, with the lower comp of the 575's you can turn them up a little more than you could on a 500 or 525 application....

Re: 3.3 whipple on 575 SCi
 

Guys,
I've been down this road too. I am now making 700+ reliable HP with my 575SCi, with mostly factory pieces, and some select upgrades, which were:
AZ Speed and Marine boost kit, will net you 75 HP, includes ECU reprogramming, an MSD 6M spark box and harness, 3.5"
blower pulley, and a low temp (126o) thermostat.
Whipple (that's what I'm using) or other intercooler, will net another 50/75 HP.
You will need to repulley your blower again to 3.25 to get back to 6PSI boost.
Interestingly, the AZ Speed and Marine recurve seems to be working fine with intercooler and 3.25 pulley. Since it may still have more left in it, I intend to put an A/F meter on it and possibly have it recurved again.
Total cost for parts here was about $4000.
Things to consider before the above are:
Time on the motor? May be a good time to rering. Even though my best friend has the AZ Spped and Marine boost kit on his otherwise stock 575 with no problems at all, I am not a fan of the sh-tty head gaskets in these motors, and have installed Felpros in mine. You may need to freshen up your Weiand 256. This blower is small for the application and needs to be as efficient as possible from the start.
These horsepower estimates are the manufacturer's, not mine. But they seem to be real. My boat (28' Nordic Heat single step) has gone from 76 MPH/GPS stock, to 85 MPH/GPS now.
Regards,
Steve

Re: 3.3 whipple on 575 SCi
 

How much more power would the whipple3.3/intercooler make versus the factory blower at 6-9 psi boost?

Re: 3.3 whipple on 575 SCi
 

Hi Plums,
This is an example of the capability of a 3.3 whipple. I know it doesnt directly correspond to your question but I thought you might be interested in the upper hp capability.

I have talked with Gary Teague about a project he did with a either a 555 inch or a 572 inch with aluminum heads and mech roller. he used a single dominator on top of an intercooled 3.3 and made 1040 hp with eight pounds of boost.
This illustates how efficient these little blowers are and how much they can flow if the heads ,cam and cubic inchs are there.
My two 552 inch long blocks have better heads than GT's engines and similar cams so I expect to be in the 900 to 925 range with five pounds boost on pump gas, at nine pounds I should be touching on 1000hp or even 1050. on race gas. Dont forget a blower can make up for a lot of shortcomings in the head department with boost so with the combination you are thinking it should be up to 800 hp easily if you make a cam change and clean up the heads. Your fuel system will need to be upgraded as well.
Just my trivia for the day. Dont forget I am a big fan of 14:71 but the whipple is great alternative and more efficient by far.

Have a good one
Ted

Re: 3.3 whipple on 575 SCi
 

Sorry for the misinformation. Yes, the 575 is a throttle body injection.

But if a man is staring at a set of perfectly good 575SCi's, is wanting more power, and is considering scrapping everything from the block up for a Whipple setup, I still say he's got more money than sense. A nice blue 575 is a very marketable motor, and as I mentioned before, I would trade my 575's for a set of 500's and some cash, and THEN think about strapping a whipple on em. Yes, dished pistons would be preferable if you are planning on running over 7 pounds of boost.

If a man is staring at a pair of tired 575's, then the Whipple idea is not a bad thought.

Is a whipple a more efficient compressor. Absolutely.
Will the stock blower on a 575 make 700hp? Absolutely.

Spend your money however you want..

Re: 3.3 whipple on 575 SCi
 

hey ted are you doing the whipples this year?

Re: 3.3 whipple on 575 SCi
 

Yes. I need the torque, no fun the way it is. just cleaning up some bills then ready to order.
It should run very well this season.
Are you on different boat now? With 575's?

Re: 3.3 whipple on 575 SCi
 

Yes. I flip floped at the last second. I'm now trying to close on a different boat with 575SCi's.

Re: 3.3 whipple on 575 SCi
 

I tend to agree with MC. Arizona Speed and others have upgrade kits for the 575 that add intercooler, boost and ECU changes. 700 HP seems easy this way.

Ted: Interesting numbers from Teague. Better heads and larger engines always help, and keep the HP down in a reasonable RPM range, but I have seen amazing numbers out of pretty plain engines. I tested a Vortech blower and a large intercooler on Nickerson's dyno once using the engine out of his personal boat. I just wanted to prove my system at the 800 HP level but he had other ideas.

I watched him make 1013 HP @ 6100 RPM using a stroked 454 with GM cast iron heads and a solid roller cam. Compression ratio was 8.25:1, boost was 9 psi and fuel was 93 octane. He didn't want to run it in the boat that way so he put on the next larger pulley and made 950 HP. Yes, the heads were ported and he used one of his special blowthrough carbs, but I was still amazed.

Hey Biggus, you were there for that test weren't you? Speaking of drive issues, your Konrads would probably handle that much power if it was from a centrifugal ststem.

Re: 3.3 whipple on 575 SCi
 

Tomcat,
Great numbers, I have two backup engines which are the same as Deans except I have 9.1 to pistons. This is good news in the event I ever have to use them with the Whipples. The heads are done to the max they can be with bigger valves etc. They made 654 hp at 6100 with a 900 cfm carb. I wonder what they made without blowers, can you find out Tomcat?
I delt with Dean several times in trhe past and his work and knowledge is excellent.

Re: 3.3 whipple on 575 SCi
 

We should have done a naturally aspirated test but had no time. My guess is they made about 600 HP on their own. This jives with your numbers with higher compression.

Re: 3.3 whipple on 575 SCi
 

Thanks Tomcat
Thats good to know. I hope my good engines pull some good #'s at fairly low boost, if I can come close to Gary teague I wll be happy.

Re: 3.3 whipple on 575 SCi
 

Ricky Perez,
FYI,
Steve

Re: 3.3 whipple on 575 SCi
 

I spoke at length with Dustin about this a yr or so ago when I bought my Pantera used with a single 575.

It's my intention to step up to this package when I freshen (110 hrs now).

Dustin suggested that with freshening, cam change, a hybrid 3.3l and a custom computer 800 all day long conservative HP on 92 octane was there to be had. The 3.3 is very efficient while the stock huffer is wheezing at much over stock. Pretty sure it used 8 injectors, maybe a couple more on the TB, can't recall. It's also a pretty low package (I can't fit an IC right now)

I'm at 650 ponies now with Dustin's non IC upgrade, picked up 4-5 mph.