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01-03-2014, 10:09 AM #16
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01-05-2014, 03:35 PM #17
I think Merc does play some games. I have a bud that had three 2004 300X motors on a DCB and they all had 150lbs out of the box. I never heard of this before. If they will do it with an X motor i see no reason why they wouldn`t do it with an opti.
DB
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01-05-2014, 08:30 PM #18
i ran the boat today with the 140psi motor. and I can tell you that there is absoluty no power difference between my 07 motor that has 110psi then this 13 with 140psi. no change in sound, holeshot, midrange or top mph.
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01-05-2014, 09:52 PM #19
When I am next to you and I hear you start the motor up, I can barely hear it run. It's true I'm half deft , but I would think that there would be a little intake noise and certainly a little rumble out of the exhaust. I know they make 300 hp out of those 3.2 's .. but they sure do sound like they are asleep.
I'm sure you could get it to move a little more air in and out . But you will need to come up with at the very least, an adjustable fuel regulator to match the added breathing capabilities ..
Why else would a 30 psi gain in compression net a zero gain in performance .. big cork in it's ^$$
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NICE PAIR liked this post
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01-05-2014, 10:28 PM #20
Static compression with an opti is only half the story, what is the air from the air injection doing in each engine? How many PSI? WHEN is it injected vs piston position? How do all those effect the combustion dynamic?
The first thing you need when you're fooling with these DFI engines is a way to look at the tune and what it is doing. Without that you're running blind. The few people that have the capability to turn out high dollar tunes surely don't want to turn it loose for the normal person, although if they did I think there would be a ton of popped motors for them to fix. lol.> Stainless steel Merc cowling plates - $110 shipped TYD - LINK <
1979 16' Action Marine/2.5L Merc S3000 - Metalflake Maniac
1984 18' Contender Tunnel/2.4 Merc Bridgeport
"Where does the love of God go, when the waves turn the minutes to hours?"
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01-06-2014, 08:16 AM #21
Im putting a bullydog programmer on mine...
- Hydrostream V-King with a Drag - SOLD
- STV RR Drag with a Drag- SOLD
- 18' seacraft c/c 200 merc- SOLD
- 18' Action Marine Retired & "Wet"
- STV Needle Nose " The Heat" - SOLD
- 21' Triad- "The Sipper"- SOLD
- 26' concept c/c twin 200 Mariners -SOLD
- STV RR - "Lil Sista" on a Strongback Trailer
- 18' Action Marine on a Strongback Trailer
Everybody wants a piece of the pie, till they try it!!!
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NICE PAIR liked this post
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01-06-2014, 09:02 AM #22Registered User
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01-06-2014, 02:39 PM #23
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NICE PAIR liked this post
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01-10-2014, 03:01 AM #24
oh my smh wtf did you do to that mid,you been sniffin to many chemicals my friend,lol
02 mirage ski racer w/ 2.5
lake tarpon (LTB racing)
"Mirage Boats... often imitated but never duplicated"
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02-18-2014, 11:10 AM #256000 RPM
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If I understand my dfi theory. The fuel or fuel air is a atomized cloud. In theory if any surface contacts the cloud condensation can result. Fuel drops burn not bang. Think peeing injector in a car. I'm a car guy who got into an inboard rebuild one day and never looked back. My thinking on a merc dfi is enlarged and blueprinted air bypass and exhaust port work. Maybe boosted air from the injector compressor. Orbitals were originally a attempt at a two stroke car.
Edit: silly me it's not the fuel drop thing. It's the pressure change. More cylinder psi less fuel into the cylinder. To compensate you have to increase injection pressure or pulse width. To much will freeze the opti system. Think airing a tire at 60psi with 40psi on the compressor the tire airs the compressor up not compressor airing the tire. You should if you know how be able too match psi increases without remapping. Cars and diesels do this auto through Mass maf and o2.
Went lean =pyro temps
back flow = blown fuel rail. Ect.Last edited by Motv18; 03-08-2014 at 07:53 PM. Reason: I'm a ditz
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01-03-2018, 12:45 PM #26
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01-03-2018, 01:21 PM #27
- Hydrostream V-King with a Drag - SOLD
- STV RR Drag with a Drag- SOLD
- 18' seacraft c/c 200 merc- SOLD
- 18' Action Marine Retired & "Wet"
- STV Needle Nose " The Heat" - SOLD
- 21' Triad- "The Sipper"- SOLD
- 26' concept c/c twin 200 Mariners -SOLD
- STV RR - "Lil Sista" on a Strongback Trailer
- 18' Action Marine on a Strongback Trailer
Everybody wants a piece of the pie, till they try it!!!
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01-03-2018, 01:48 PM #28
that is a work of art.. lovely finish.
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motorheadbishop thanked for this post
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01-04-2018, 12:26 PM #29
I can say this with bumping compression in an opti..... ive done it. 250xs heads and 250 xs pistons on a 225 opti with the ecm and rails set up for stocker big chamber heads and flat pistons.... idle is not near as smooth... my motor was STUPID rich as stock its right at perfect A/F now. So it does seriously lean em out. I need ti bump fuel at idle cause it does have a cold miss with 135 psi compression once warm she smooths out. But it does get fuel sensitive and if the injectors arent perfect it will drop a hole from time to time. I just need ti get a ECM and rail assemby from a blown 225xs and swap it over
4-16-2014. 25 years old today... the fishin boat doesnt look to bad for a classic does she
things that were are no longer as they are today...
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04-04-2018, 06:47 PM #306000 RPM
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Wow that’s a thread resurrection.
To answer one question. Yep pressure is higher with the compressor running. I can’t find it in the book, but I remember seeing something like 160-170 depends on combustion chamber size and the di in use.