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Originally Posted by dyersblowers
(Post 3841018)
Here's a link to our 575sci conversions to 871s.
Polished 871s are $3750.00 per engine. http://www.dyersblowers.com/187/1676.html Bill Dyer |
Originally Posted by troper
(Post 3767055)
Finish the install and took it out yesterday afternoon. She ran great with no problems. 97degrees and I did 1 WOT run, boost was right at 5 lbs spinning Lab 30P and hitting the rev limiter. solid 85 MPH. Did not think I would be that fast with a non step 12000lbs boat. I am a happy camper. If anyone is thinking about doing this upgrade to the 575, don't hesitate it's well worth it. Let me know if you have any questions.
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so is it safe to say you gained 4-5mph just by switching to the larger blower and running almost same boost??
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Originally Posted by mcprodesign
(Post 3841154)
How much boost will a stock 2004 575 handle anyway
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Originally Posted by MILD THUNDER
(Post 3851240)
so is it safe to say you gained 4-5mph just by switching to the larger blower and running almost same boost??
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What speeds were you at with stock 575's. the other 2 40's I use to run with were true 70 mph boats on GPS. Congrats on your build. I've heard great things with minor upgrades to 575's.
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Originally Posted by troper
(Post 3851358)
You are correct.
Im Not anti intercooler, but I don't know many guys running roots who installed chillers under their blowers and picked up 5mph or better. Especially in a boat like a 40 outlaw! Good stuff. Now try cranking the boost up another 1-2psi, and report back. The 871 will do it no problem. |
Originally Posted by MILD THUNDER
(Post 3851474)
That's awesome. Pretty much what I gained going from 250 blowers to 420 blowers.
Im Not anti intercooler, but I don't know many guys running roots who installed chillers under their blowers and picked up 5mph or better. Especially in a boat like a 40 outlaw! Good stuff. Now try cranking the boost up another 1-2psi, and report back. The 871 will do it no problem. Those giant satin finish blowers are just beggin tk be painted merc blue, I think they would look sick! |
4bus...are what mods did you do to your 575's? Chillers, heads, cam?? Did you have them Dynod? Jus curious.
Eric |
Originally Posted by TRL505
(Post 3851612)
4bus...are what mods did you do to your 575's? Chillers, heads, cam?? Did you have them Dynod? Jus curious.
Eric full roller conversion 3.5 pulley ECU reflash 120 degree stat plumbing for chillers but going to test without to start. My objective was to improve more than it was to add speed. I thought the boat performed well on top stock, and was very reliable. My issues were idle, loading up, soot/extreme richness, and known HG failures. The cam change was a give in, seeing that we had the heads off. I have to say if I did not read oso I most likely would have left them in and just did an ecu and pulley.....the talk on this site scared me into tearing the heads and cams out of engines with 60 hrs! My engines and boat also sat for 8 years, showing only 3 hrs on the ecus. Builder saw signs of spring fatigue on a few valves and the edge of an intake lifter was missing tiny pieces and marked the cam. Lower end is perfect. Man I ramble.......sorry, back to the OP :lolhit: |
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