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Search: Posts Made By: dcg9381
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Forum: General Q & A
02-04-2008, 11:03 AM
Replies: 9
Views: 2,123
Posted By dcg9381

I can't comment on the 4 bladed prop. I've got...

I can't comment on the 4 bladed prop.
I've got a 385 hp 23.5' boat, ~4000 lbs.
It's proped with a 3 blade 23P Mirage plus.
The OEM prop was 23P also.

I'd probably start with the equiv of a 23P...
Forum: General Q & A
02-04-2008, 11:02 AM
Replies: 3
Views: 5,005
Posted By dcg9381

Thought the Mercruiser setups were not a looping...

Thought the Mercruiser setups were not a looping fuel system..

I have had a 350 Mag MPI that would vapor lock - not a great thing.
Forum: General Q & A
10-03-2007, 03:55 PM
Replies: 15
Views: 22,555
Posted By dcg9381

What are the differences between the Mag and...

What are the differences between the Mag and non-Mag EFI systems that make one good for a modified motor and one no good?

I've seen people reprogram these systems - can anyone point me to the...
Forum: General Q & A
09-27-2007, 02:07 PM
Replies: 18
Views: 28,683
Posted By dcg9381

The problem with a return line is that it can...

The problem with a return line is that it can create non-EFI tank issues when putting fuel back at high pressure.

Now.. I'll tell you that I ran into this post after getting billed $175 for a...
Forum: General Q & A
09-27-2007, 09:47 AM
Replies: 20
Views: 5,198
Posted By dcg9381

OK guys, quit diverting on torque/hp.. Maybe a...

OK guys, quit diverting on torque/hp.. Maybe a new thread with some dyno postings would be great?


Timing: Fair guess. So the timing was off slightly (I didn't ask how much) - probably from me...
Forum: General Q & A
09-26-2007, 09:20 AM
Replies: 20
Views: 5,198
Posted By dcg9381

I took her into a local Marine shop, I asked if...

I took her into a local Marine shop, I asked if they had some EFI experience as well as the EFI diagnostic tool - they said they did. The mechanic I talked to was a bit stumped also, but we'll see...
Forum: General Q & A
09-25-2007, 09:38 PM
Replies: 20
Views: 5,198
Posted By dcg9381

Well, I replaced me cap/rotor/plugs/wires. Cap...

Well, I replaced me cap/rotor/plugs/wires.
Cap was pretty crapped up, wires looked OK - one rub spot.
Plugs OK.
No change, other than I needed to do the cap.
I had one plug that was a little...
Forum: General Q & A
09-25-2007, 02:53 PM
Replies: 20
Views: 5,198
Posted By dcg9381

I think if my fuel pump was lagging or if I had a...

I think if my fuel pump was lagging or if I had a fuel problem, I'd hear the motor lean out and misfire. I can't hear a hint of misfiring on this motor. I've tuned a few stand alone EFI cars -...
Forum: General Q & A
09-25-2007, 08:38 AM
Replies: 20
Views: 5,198
Posted By dcg9381

I've played with the prop selector. I've got...

I've played with the prop selector.
I've got test data from one of the boating magazines that tested this boat in 1998 with a top speed of 68.5 mph. That could have been in cold weather, flat...
Forum: General Q & A
09-24-2007, 11:23 PM
Replies: 20
Views: 5,198
Posted By dcg9381

Thanks.. That's exactly what i was looking for...

Thanks.. That's exactly what i was looking for and couldn't find! I'll run the codes tomorrow.

I am trimming the out drive up, just shy of half way on the gauge. I know what it feels like to...
Forum: Do It Yourself, Boating on a Budget
09-24-2007, 11:22 PM
Replies: 59
Views: 245,544
Posted By dcg9381

Dave: Just thanks for posting.. :-)

Dave:
Just thanks for posting.. :-)
Forum: General Q & A
09-24-2007, 10:22 PM
Replies: 20
Views: 5,198
Posted By dcg9381

Can someone give me Reta's email (I assume this...

Can someone give me Reta's email (I assume this is a user name).

Interesting - I got under the dash tonight and found that the tach was set to a 6 cylinder calibration.
I wonder if someone...
Forum: General Q & A
09-24-2007, 09:35 PM
Replies: 20
Views: 5,198
Posted By dcg9381

Can you guys give me the low down on checking the...

Can you guys give me the low down on checking the codes on the boat.. I know that I can jumper the boat to base timing, but i need to know what plug and which terminals of that plug.


I believe...
Forum: General Q & A
09-24-2007, 09:33 PM
Replies: 10
Views: 6,799
Posted By dcg9381

Thanks, guys.. I haven't gotten back there to...

Thanks, guys.. I haven't gotten back there to look at the coil setup. Appreciate the advice!
Forum: General Q & A
09-24-2007, 08:52 PM
Replies: 20
Views: 5,198
Posted By dcg9381

Compression numbers Front of boat 158 ...

Compression numbers

Front of boat
158 157
162 155
150 150
150 156

That means it's not a major mechanical issue (at least to me) - Still need troubleshooting advice on this motor.
Forum: General Q & A
09-24-2007, 07:48 PM
Replies: 20
Views: 5,198
Posted By dcg9381

7.4L mag MPI tops out at 3900 - Troubleshooting?

1998 Glastron CSX-23
109 hours on the meter.
New boat (to me).
385hp Magnum MPI 7.4L

She's topping out at about 50mph, previous owner said speedo was off, but I confirmed it via GPS. The...
Forum: General Q & A
09-24-2007, 07:42 PM
Replies: 10
Views: 6,799
Posted By dcg9381

Well, my prop is fine. I went and bought an...

Well, my prop is fine.
I went and bought an inductive tach, and my boat tach is way off.

23P Merage Plus
31mph 2600rpm
43mph 3460rpm indicated 4600rpm
50mph 3900rpm indicated 5200rpm

At...
Forum: General Q & A
09-24-2007, 01:47 PM
Replies: 10
Views: 6,799
Posted By dcg9381

I understand that prop slip is one measure of...

I understand that prop slip is one measure of prop efficiency.. 30% is high. A boat like mine shouldn't be more than 15-20%.

My understanding is that earlier prop designs could actually slip on...
Forum: General Q & A
09-24-2007, 09:11 AM
Replies: 10
Views: 6,799
Posted By dcg9381

Any way that this prop could slip? Forgive my...

Any way that this prop could slip? Forgive my lack of the proper terminolgy - but the composite piece that sits in the center of the prop? I imagine I'd notice if it was slipping as it would be...
Forum: General Q & A
09-23-2007, 11:56 PM
Replies: 20
Views: 18,288
Posted By dcg9381

I haven't worked on the 502 mag, but on the 350...

I haven't worked on the 502 mag, but on the 350 mag there is a schrader valve on the fuel rail. If you're vapor locked, when you depress this valve you'll get air.. (warning, may get fuel also - be...
Forum: General Q & A
09-23-2007, 06:10 PM
Replies: 10
Views: 6,799
Posted By dcg9381

7.4L Mag MPI RPM / MPH - prop slip?

I've got a 1998 Glastron CSX-23. New boat to me.
It's got a 385hp 7.4L (454) Mag MPI motor, which seems to run great.
I believe this boat should hit 65-68, properly propped.
I bought the boat...
Showing results 1 to 21 of 21


 
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