[Diy_efi] TBI in boat

Sun Aug 8 16:22:27 GMT 2004

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I had a local machine shop mill one out of 1-1/4" Aluminum.  I just took
them a riser gasket as a pattern.  My risers (Indmar) have water =
passages on
all four sides.  I just eliminated the water passage on the side where =
the
O2 sensor will mount. Boats tend to run richer than cars.  Depending on =
your
calibration, you may never achieve closed loop parameters.  The typical =
boat
thermostat opens at 140 degrees, much cooler than a car.  Your boat ECM =
may
not play very well with your boat cam. Boat cams have a relatively =
narrow
lobe separation angles and about 10 degrees more exhaust duration than
intake duration, this means lower vacuum, which in a TBI speed density
system will make you run rich.

=20

I think a truck based calibration would get you close.  For tuning you =
would
need a wide-band O2 sensor setup to customize your calibration, ts.  The
stock GM 350 TBI setup is only good up to about 275 HP.  If your make =
more
than that, you will need to run w/ the Big block 670 CFM throttle body.

=20

My experience is in Marine fuel injections based on GM MEFI controller.  =
The
system I am building is a MEFI 4 based port injected system.  As far as
tweeking the car ECMs there is an abundance of Cals, tuning software, =
and
guys that know what they are doing.  This setup will work; is just the
calibrations available will not provide optimum horsepower.

=20

Good luck.

=20

Tim

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] =
On
Behalf Of Bill USN-1
Sent: Saturday, August 07, 2004 9:36 PM
To: 'A list for Do-It-Yourself EFI'
Subject: RE: [Diy_efi] TBI in boat

=20

Can you put it in the exhaust cross over on the intake?

=20

Bill

USN-1

=20

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] =
On
Behalf Of Wallace O. Powelle
Sent: Saturday, August 07, 2004 10:26 PM
To: diy_efi at diy-efi.org
Subject: [Diy_efi] TBI in boat

=20

I'm going to put a TBI system of of a 305 chevy on my Volvo Penta 305.  =
Any
advice or words of warning would be appreciated. Should I be able to get =
by
with the factory prom, Is there a built in rev limit, does anyone know =
of a
source for a spacer to install O2 sensor between manifold & riser?  =
Thanx,
Wallace=20

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<div class=3DSection1>

I had a local machine shop mill one =
out of
1-1/4&#8221; Aluminum.&nbsp; I just took them a riser gasket as a
pattern.&nbsp; My risers (Indmar) have water passages on all four =
sides.&nbsp;
I just eliminated the water passage on the side where the O2 sensor will =
mount.
Boats tend to run richer than cars.&nbsp; Depending on your calibration, =
you
may never achieve closed loop parameters.&nbsp; The typical boat =
thermostat
opens at 140 degrees, much cooler than a car.&nbsp; Your boat ECM may =
not play
very well with your boat cam. Boat cams have a relatively narrow lobe
separation angles and about 10 degrees more exhaust duration than intake =
duration,
this means lower vacuum, which in a TBI speed density system will make =
you run
rich.

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I think a truck based calibration =
would
get you close.&nbsp; For tuning you would need a wide-band O2 sensor =
setup to
customize your calibration, ts.&nbsp; The stock GM 350 TBI setup is only =
good
up to about 275 HP.&nbsp; If your make more than that, you will need to =
run w/
the Big block 670 CFM throttle body.</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>My experience is in Marine fuel =
injections
based on GM MEFI controller.&nbsp; The system I am building is a MEFI 4 =
based
port injected system.&nbsp; As far as tweeking the car ECMs there is an
abundance of Cals, tuning software, and guys that know what they are =
doing.&nbsp;
This setup will work; is just the calibrations available will not =
provide
optimum horsepower.</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Good luck.</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Tim</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> =
diy_efi-bounces at diy-efi.org
[mailto:diy_efi-bounces at diy-efi.org] <b><span =
style=3D'font-weight:bold'>On
Behalf Of </span></b>Bill USN-1<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> </span></font><font =
size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'>Saturday,
 August 07, 2004</span></font><font size=3D2 face=3DTahoma><span =
style=3D'font-size:
10.0pt;font-family:Tahoma'> </span></font><font size=3D2 =
face=3DTahoma><span
 style=3D'font-size:10.0pt;font-family:Tahoma'>9:36 =
PM</span></font><font size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'><br>
<b><span style=3D'font-weight:bold'>To:</span></b> 'A list for =
Do-It-Yourself
EFI'<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: [Diy_efi] =
TBI in boat</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>&nbsp;</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>Can you put it =
in the
exhaust cross over on the intake?</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>&nbsp;</span></fo=
nt></p>

<div>

<p class=3DMsoAutoSig style=3D'margin-left:.5in'><b><font size=3D3 =
color=3Dnavy
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;color:navy;font-weight:
bold'>Bill</span></font></b></p>

<p class=3DMsoAutoSig style=3D'margin-left:.5in'><b><font size=3D3 =
color=3Dnavy
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;color:navy;font-weight:
bold'>USN-1</span></font></b></p>

</div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>&nbsp;</span></fo=
nt></p>

-----Original =
Message----- 
From: =
diy_efi-bounces at diy-efi.org
[mailto:diy_efi-bounces at diy-efi.org] On
Behalf Of Wallace O. Powelle 
Sent: Saturday, August =
07, 2004
10:26 PM 
To: =
diy_efi at diy-efi.org 
Subject: [Diy_efi] TBI in =
boat

<p class=3DMsoNormal style=3D'margin-left:1.0in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>&nbsp;</span></font></p>

<div>

I'm going to put a TBI =
system of of
a 305 chevy on my Volvo Penta 305.&nbsp; Any advice or words of warning =
would
be appreciated. Should I be able to get by with the factory prom, Is =
there a
built in rev limit, does anyone know of a source for a spacer to install =
O2
sensor between manifold &amp; riser?&nbsp;&nbsp;Thanx, =
Wallace&nbsp;

</div>

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