[DeTomaso] Vacuum source on IR manifolds
Ken Green
kenn_green at yahoo.com
Sat May 26 12:11:59 EDT 2018
Ed,
I'm confused, the photo looks like a Hilborn mechanical injection manifold?
Ken
From: Ed Mendez <edducati at mac.com>
To: Robert Stroj <npdrs at maui.net>
Cc: "DeTomaso at server.detomasolist.com DeTomaso at server.detomasolist.com" <detomaso at server.detomasolist.com>
Sent: Friday, May 25, 2018 10:59 PM
Subject: Re: [DeTomaso] Vacuum source on IR manifolds
Here is a picture of mine. I have a line going to each runner then all
to one small common block for brakes and MAP. I am running indexed
speed density mode on my FAST XFI 2.0, I have have two MAP sensors one
for manifold absolute pressure and one for barometric pressure, it
takes a reading form both and adjusts for elevation. I am not running
an IAC because as the article states below you would have to have two
lines plumbed to each port.
Here is a section from a forum when I was doing research.
======
Perhaps add a vacuum reservoir to act as a "shock absorber" and give a
more even MAP reading, go speed density for the tune. For the map
signal, you need a vacuum feed from each port, tied into a common
"metering block" and then to the map sensor. You cannot take a vacuum
signal from a single port, needs to be from all of them. You also don't
want to share that vacuum source with the iac or anything else. They
make nice remote mount iac's, but again they need their own separate
lines to each port. Think of something like a port-injected nitrous
system with the stainless hard lines going to each port in the intake
and tieing together in a billet aluminum block. On mine, there were two
lines to each port hidden underneath the manifold just like a hidden
nitrous kit. Then after the block where they came together we put two
bulkhead fittings in the rear of the intake (one for iac and one for
map) so there was a connection from the top of the intake. Totally
hidden, very clean looking and works perfect.
Using a SMALL plenum for the vacuum is a requirement - not an option -
otherwise you have nowhere to take the MAP reading. There is very very
little vacuum signal from these types of intakes. I would advise you to
use the plenum for ONLY the MAP signal. I was trying to remember - but
think I could only get 4 or 5 inches of vacuum reading at my plenum.
The pulse signal is soooooo weak without having a large common plenum
of the dual plane / single plane intake....
To help tune the idle circuit -- in the efi maps -- you make smaller
incremental
grids in the idle vacuum and rpm map.... then you can tune out the
lumps easier with finer control... and also using the idle spark add or
subtract.
IMHO, a guy that's GOOD with these ECU EFI systems can make
anything/combo run like a swiss watch.
I just finished helping a buddy with his 8 stack (Imagine Injection)
install - using Fast XFI on his 454 big block. It started the FIRST
TIME - in about 3 rev's - once I tweaked the distributor timing to
actually match the ECU - it purred... and there's nothing like the
sound of air being gulped one cylinder at a time.
======
In reading this however, I have the single lines to each port "the
black lines in the picture" I have them going to a tiny plenum and have
my brakes and MAP going to it and have no issues at all.
I suppose this depends oil if you have a huge cam or not, in that case
Don Byars makes this bitchin vacuum pump setup the for brakes that fits
underneath and in front of the radiator.
Ed [cid:BB9234B6-5F88-4571-A521-3C6B9693C26D]
On May 25, 2018, at 22:28, Robert Stroj <[1]npdrs at maui.net> wrote:
Hi, I am in process of installing IR fuel injection, using Fast Xfi
2.0.
Would like to hear from someone running similar setup how did you plumb
vacuum source manifold.
Was planning to use just one common manifold (connected to all 8
runners) and then connect servo brake tube, MAP sensor and vacuum
regulated fuel pressure regulator all to that manifold.
Would that work fine or will signal from MAP get wrong readings when
breaking (booster maybe reducing vacuum)?
If this is fine, is there some rule on how to size this manifold?
Thanks, Robert
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-------------- next part --------------
Ed,
I'm confused, the photo looks like a Hilborn mechanical injection
manifold?
Ken
__________________________________________________________________
From: Ed Mendez <edducati at mac.com>
To: Robert Stroj <npdrs at maui.net>
Cc: "DeTomaso at server.detomasolist.com DeTomaso at server.detomasolist.com"
<detomaso at server.detomasolist.com>
Sent: Friday, May 25, 2018 10:59 PM
Subject: Re: [DeTomaso] Vacuum source on IR manifolds
Here is a picture of mine. I have a line going to each runner then
all
to one small common block for brakes and MAP. I am running indexed
speed density mode on my FAST XFI 2.0, I have have two MAP sensors
one
for manifold absolute pressure and one for barometric pressure, it
takes a reading form both and adjusts for elevation. I am not running
an IAC because as the article states below you would have to have two
lines plumbed to each port.
Here is a section from a forum when I was doing research.
======
Perhaps add a vacuum reservoir to act as a "shock absorber" and give
a
more even MAP reading, go speed density for the tune. For the map
signal, you need a vacuum feed from each port, tied into a common
"metering block" and then to the map sensor. You cannot take a vacuum
signal from a single port, needs to be from all of them. You also
don't
want to share that vacuum source with the iac or anything else. They
make nice remote mount iac's, but again they need their own separate
lines to each port. Think of something like a port-injected nitrous
system with the stainless hard lines going to each port in the intake
and tieing together in a billet aluminum block. On mine, there were
two
lines to each port hidden underneath the manifold just like a hidden
nitrous kit. Then after the block where they came together we put two
bulkhead fittings in the rear of the intake (one for iac and one for
map) so there was a connection from the top of the intake. Totally
hidden, very clean looking and works perfect.
Using a SMALL plenum for the vacuum is a requirement - not an option
-
otherwise you have nowhere to take the MAP reading. There is very
very
little vacuum signal from these types of intakes. I would advise you
to
use the plenum for ONLY the MAP signal. I was trying to remember -
but
think I could only get 4 or 5 inches of vacuum reading at my plenum.
The pulse signal is soooooo weak without having a large common plenum
of the dual plane / single plane intake....
To help tune the idle circuit -- in the efi maps -- you make smaller
incremental
grids in the idle vacuum and rpm map.... then you can tune out the
lumps easier with finer control... and also using the idle spark add
or
subtract.
IMHO, a guy that's GOOD with these ECU EFI systems can make
anything/combo run like a swiss watch.
I just finished helping a buddy with his 8 stack (Imagine Injection)
install - using Fast XFI on his 454 big block. It started the FIRST
TIME - in about 3 rev's - once I tweaked the distributor timing to
actually match the ECU - it purred... and there's nothing like the
sound of air being gulped one cylinder at a time.
======
In reading this however, I have the single lines to each port "the
black lines in the picture" I have them going to a tiny plenum and
have
my brakes and MAP going to it and have no issues at all.
I suppose this depends oil if you have a huge cam or not, in that
case
Don Byars makes this bitchin vacuum pump setup the for brakes that
fits
underneath and in front of the radiator.
Ed [cid:BB9234B6-5F88-4571-A521-3C6B9693C26D]
On May 25, 2018, at 22:28, Robert Stroj <[1][1]npdrs at maui.net> wrote:
Hi, I am in process of installing IR fuel injection, using Fast Xfi
2.0.
Would like to hear from someone running similar setup how did you
plumb
vacuum source manifold.
Was planning to use just one common manifold (connected to all 8
runners) and then connect servo brake tube, MAP sensor and vacuum
regulated fuel pressure regulator all to that manifold.
Would that work fine or will signal from MAP get wrong readings when
breaking (booster maybe reducing vacuum)?
If this is fine, is there some rule on how to size this manifold?
Thanks, Robert
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