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Engine Technical Discussion This is our non outboard engine related technical discussion forum. If your boat is powered by a Inboard/Outboard, Jet drive, V-drive, or even something else, then this is the forum for you! Topics include engine repair and maintenance, modifications, drives and gearcases, electrical and electronics, etc. For technical assistance related to outboards, please use our outboard tech forum.

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Old 03-08-2016, 04:48 PM   #1
Chellems
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Model Owned: 2000 Stiletto BR, 23'9", 454 MAG MPI, PROCHARGER

Default 454 MAG MPI Pro Charger upgrade

Ok pulled the trigger Kunkal Marine installing and rigging my Stiletto with a pro charger. Cant wait for spring!
Currently boat runs 69.9 MPH on GPS running 25 Mirage, 4900 RPM (Bravo 1 1.5). Started at 66.6 MPH with 24 Bravo 1 5150 RPM.
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Old 03-08-2016, 06:31 PM   #2
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Very Interesting, What exhaust are you running or going to run. I run a 2000 24 ZT with the same mota except the previous owner was nice enough to install a set CMI E-top headers. I run 72 mph with a 25 mirage plus 4700/4800.

Would you mind if I hit you up for the hard numbers's$$$$ sometime Merc245
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Old 03-09-2016, 07:39 AM   #3
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Model Owned: 2000 Stiletto BR, 23'9", 454 MAG MPI, PROCHARGER

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Very Interesting, What exhaust are you running or going to run. I run a 2000 24 ZT with the same mota except the previous owner was nice enough to install a set CMI E-top headers. I run 72 mph with a 25 mirage plus 4700/4800.

Would you mind if I hit you up for the hard numbers's$$$$ sometime Merc245
Based from my prop testing a change to a 25P Mirage will get you an additional 200-300 RPM's with no other change. No problem on the $$$, his estimate was $8,300, will let you know when we are done.
Stock Merc Manifolds but asked Jason if changing to headers would help. Jason stated not necessary but would help. Looks like from your results 2-3 MPH. Not sure if Jason will be changing the head gaskets or not but I don't think so. Think the plan is to keep the boost down around 3 PSI to keep her reliable. I will continue to post as we go.
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Old 03-31-2016, 01:18 PM   #4
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Model Owned: 2000 Stiletto BR, 23'9", 454 MAG MPI, PROCHARGER

Default 454 MAG MPI Pro Charger Upgrade

Okay made the 5 1/2 hour journey to Ohio yesterday and met with Jason Kunkel and dropped the boat off. The Pro Charger system was there on the floor just waiting for the boat. I cannot wait to have my CM put in the water and see her roar!
May have him add headers at the same time just depends upon the $$$. That may have to wait until next year we will see.
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Old 04-19-2016, 08:15 AM   #5
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Okay made the 5 1/2 hour journey to Ohio yesterday and met with Jason Kunkel and dropped the boat off. The Pro Charger system was there on the floor just waiting for the boat. I cannot wait to have my CM put in the water and see her roar!
May have him add headers at the same time just depends upon the $$$. That may have to wait until next year we will see.
Just one question. I like the idea of doing this but what happens if 3 or 6 months down the road something goes wrong with the supercharger or the install. Do you have to drive the boat the 5 1/2 hours back to get it repaired under warranty?
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Old 04-19-2016, 09:09 AM   #6
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Model Owned: '85 Convincor twin 200's

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Beautiful boat! I'm sure you'll be happy with Kunkel's work and the trip was worth every penny as many have made the trip before. A shop that does great work at a fair price is definitely worth the trip.
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Old 04-19-2016, 07:26 PM   #7
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Model Owned: 2000 Stiletto BR, 23'9", 454 MAG MPI, PROCHARGER

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Just one question. I like the idea of doing this but what happens if 3 or 6 months down the road something goes wrong with the supercharger or the install. Do you have to drive the boat the 5 1/2 hours back to get it repaired under warranty?
Yes! I prefer to use the experts to do what they do best. Jason Kunkel is known as one of the top people not on just this forum but on multiple people.

I would prefer to deal with the man that told me super chargers don't blow up motors the people that install them do!

5 1/2 hr drive is really not that big a deal for me.
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Old 03-31-2016, 01:22 PM   #8
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Model Owned: 2000 Stiletto BR, 23'9", 454 MAG MPI, PROCHARGER

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Based from my prop testing a change to a 25P Mirage will get you an additional 200-300 RPM's with no other change. No problem on the $$$, his estimate was $8,300, will let you know when we are done.
Stock Merc Manifolds but asked Jason if changing to headers would help. Jason stated not necessary but would help. Looks like from your results 2-3 MPH. Not sure if Jason will be changing the head gaskets or not but I don't think so. Think the plan is to keep the boost down around 3 PSI to keep her reliable. I will continue to post as we go.
I will have a 25P Mirage for sale and a brand new never in water 27P Mirage for sale. I would think the 27P if you have it labbed would get you the same RPM's with a 3-5 MPH gain. If interested just let me know.
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Old 03-31-2016, 01:43 PM   #9
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Are they Mirage or Mirage Plus?
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Old 03-31-2016, 04:48 PM   #10
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Model Owned: 2000 Stiletto BR, 23'9", 454 MAG MPI, PROCHARGER

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Are they Mirage or Mirage Plus?
Mirage. I created a detailed spreadsheet for prop testing.

27 pitch Mirage Plus
- 4400 RPM, 66 MPH GPS, 12% Slip

25 Pitch Mirage
- 4900 RPM, 69.9 MPH GPS, 10% Slip, boat came alive

The Mirage prop will turn 200-300 higher RPM then the Mirage Plus.
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