3.3 whipple on 575 SCi
03-08-2005, 10:19 PM
#2
Platinum Member
Platinum Member
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.
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.
03-09-2005, 05:31 AM
#6
Registered
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
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
03-09-2005, 05:50 AM
#7
Platinum Member
Platinum Member
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.
Biggus, why don't you do it and let us all know how you like it.
03-09-2005, 06:00 AM
#8
Registered
Re: 3.3 whipple on 575 SCi
Originally Posted by Quiet Storm
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.
Biggus, why don't you do it and let us all know how you like it.
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
..I wonder how fast a 30 Mystique TS would run with 1700 hp!
03-09-2005, 07:25 AM
#9
A to Z
Platinum Member
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....
03-09-2005, 08:53 AM
#10
Registered
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
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
Last edited by Steve Zuckerman; 03-13-2005 at 09:31 PM.
