Steve,
No easy way to get the factory setup to recognize boost. You can modify the controller to rely on the TPS to control
injectors, but not really that accurate. There are two options (without redesigning the factory controller) to control
fuel under boost conditions. You can use a FMU (fancy device to control fuel pressure to the injectors) or you can
use additional injectors and an add on controller. My opinion.... use the additional injectors and use an aftermarket
boost retard igniton system to control ignition. Currently I am using an ignition device made by J&S Electronics.
The device is called SafeGuard. The device is an ignition system, but additionally it alters ignition on a cylinder by
cylinder basis. It uses a knock sensor to control timing for each cylinder. Not cheap, but it works........
Frank
STLAURENTS@mctssa.usmc.mil on 10/27/2000 07:05:00 AM
To: dakota-truck@BUFFNET.NET@Internet
cc: (bcc: Frank T Holloway/CA/KAIPERM)
Subject: RE: DML: 408 Update and blower question - Frank
Frank, explain the logic behind what size injectors to use when applying a
blower unit? If I keep the Dak, I want one by Feb 1st.
-------------------------------------------
Steven St.Laurent
Test Engineer
Test Branch, GSD, MCTSSA
MARCORSYSCOM, USMC
760-725-2506 (DSN 365-2506)
Work:mailto:stlaurents@mctssa.usmc.mil
Home:mailto:saint1958@home.com
-----Original Message-----
From: ABeerCan@aol.com [mailto:ABeerCan@aol.com]
Sent: Thursday, October 26, 2000 7:11 PM
To: dakota-truck@buffnet.net
Subject: Re: DML: 408 Update and blower question
<<<Will,
Be careful there..... If you have cleaned up the heads and are using a
decent intake (M-1) 29 lb/hr injectors is all you
need (310 CC). That's what we are using. I hope you are not using the
factory
rods (A-type or Magnums), you really
need to step up to either Eagle or Manley's. Factory rods are not up to
snuff. What pistons are you using????? If they
are Diamond's pistons, then you have a static C/R with the Magnum heads
right
up around 12/1 (pumping compression) above 200 PSI unless you have a cam
with
a hell of a lot of overlap. Even the soon to be released
KB pistons, static compression is up to 10/1. If you are actually going to
use a blower, use one of the after-market
injector plates and computer (Vortech, Paxton, etc). Smaller injectors (29
lb/hr) will give you a better spray pattern and
the plate will give you better fuel control under boost. Good luck with the
head gaskets.
Frank>>>
Frank,
I am using MP connecting rods with MP pistons that have a shorter total
height. The cr is around 9.95:1 (was higher, but the head gaskets we are
using are thicker fel-pro's than normal and the pistons were given a slight
shave on top). The heads are the MP aluminum Magnum heads that were
massaged
a little more along with crower 1.6:1 rockers and triple springs. The
valves
have had the stem shaved down and the heads swirled. I am going to be
running a Comp Cam pn 20-604-8. It is a 264/274 adv 210/220@.050 duration
with .512/.512 lift with 1.5 rockers and 112 lobe sep. My machinist figures
that lift and duration will work well with the boost from the sc. I believe
it will also, esp with the head work and intake we've done. Oh yeah, we are
going to run the MPI intake. We were doing so cals on the puter and it spit
out 35 lb her injectors, but we figured 36 would be good. Oh yeah,
everything is forged (pistons, crank, rods, etc.....). I got lucky in the
stock market and decided not to skimp on anything. Anyway, which blower?
PowerDyne or Paxton? Novi 2000......sweet........
Will
96 Cylindrically Challenged (Soon to have a blown 408 stroked 360!!!) V-6
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