FI engine management
#1
FI engine management
I have a 95 6 speed. What is the best engine managment for forced induction. Does the ems read boost pressure? Will it automatically adjust fuel for boost pressure? Details needed. Thanks in advance.
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Burning Brakes
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Ron
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Most aftermarket EMSs are speed density. They work off a MAP sensor that reads both boost and vacuum, as long as you go with one over 1 bar. The 2 bar MAP sensors read up to around 15 psi of boost, and you get another 14-15 for each bar over that. They then determine the amount of fuel to add by the MAP sensor reading and the RPM. Some go off a pulse width table and need to be told to add more fuel, while many of the ones with what's known as a VE table automatically add more fuel based on the air density (boost and temperature).
Putting an aftermarket ECM on a car with an Optispark has a few unique challenges - the Optispark looks like someone tried to throw a Nissan 240SX distributor meant for a four banger on a V8 without changing the trigger pattern, and a lot of aftermarket ECMs have trouble with it. With many of then you would need a different trigger setup, like an MSD Flying Magnet or a missing tooth type wheel (A HEI distributor adaptation would also work as a trigger wheel; these are compatible with almost anything). A few systems out there do work with the Optispark sensors directly.
I thought I'd toss out some thoughts on different systems. I work for a company that sells Megasquirt and Spectre systems; I just wanted to let you know I'm not exactly neutral. But I do respect most of the other systems. Here's some commentary on some systems that could work for you, and some systems I don't like and why. I'll put them in alphabetical order. One rule to remember is that a system can't be better than its tuning; you'll want to tune it on a dyno to get the fuel and spark tables to match your engine's needs.
Accel DFI: A sound enough system, but they make you pay extra to unlock certain software features to tune it. I'm pretty sure this one requires a Flying Magnet type trigger wheel.
AEM: A fairly high-end system with a lot of features. Not sure if it requires a trigger wheel or not.
Big Stuff 3: Equipped with plenty of features and works with the Optispark sensors. Note that these guys are the ones who build ECUs for MSD as well.
Electromotive: A system with a distributorless ignition that requires adding a 60-2 Bosch style trigger wheel.
FAST XFI: Another system that works with the Optispark sensors.
Holley: The Commander system is a basic speed density system that could work with a Flying Magnet type trigger wheel. The Pro-Jection uses throttle position instead of a MAP sensor and is not appropriate for forced induction.
Mass-Flo: These are actually chipped OEM computers, usually (possibly always) based on a Ford EEC-IV.
Megasquirt: Currently, this would require a trigger wheel or HEI, too. It can work on this engine, but as different builders put different feature sets in them, be sure to talk things over with a dealer if you're buying one fully assembled.
Motec: One of the most feature loaded, and expensive, ECUs out there.
Spectre: A Megasquirt based ECU with a lot of features (and bling) added. Would require using a trigger wheel and a different IAC valve.
Putting an aftermarket ECM on a car with an Optispark has a few unique challenges - the Optispark looks like someone tried to throw a Nissan 240SX distributor meant for a four banger on a V8 without changing the trigger pattern, and a lot of aftermarket ECMs have trouble with it. With many of then you would need a different trigger setup, like an MSD Flying Magnet or a missing tooth type wheel (A HEI distributor adaptation would also work as a trigger wheel; these are compatible with almost anything). A few systems out there do work with the Optispark sensors directly.
I thought I'd toss out some thoughts on different systems. I work for a company that sells Megasquirt and Spectre systems; I just wanted to let you know I'm not exactly neutral. But I do respect most of the other systems. Here's some commentary on some systems that could work for you, and some systems I don't like and why. I'll put them in alphabetical order. One rule to remember is that a system can't be better than its tuning; you'll want to tune it on a dyno to get the fuel and spark tables to match your engine's needs.
Accel DFI: A sound enough system, but they make you pay extra to unlock certain software features to tune it. I'm pretty sure this one requires a Flying Magnet type trigger wheel.
AEM: A fairly high-end system with a lot of features. Not sure if it requires a trigger wheel or not.
Big Stuff 3: Equipped with plenty of features and works with the Optispark sensors. Note that these guys are the ones who build ECUs for MSD as well.
Electromotive: A system with a distributorless ignition that requires adding a 60-2 Bosch style trigger wheel.
FAST XFI: Another system that works with the Optispark sensors.
Holley: The Commander system is a basic speed density system that could work with a Flying Magnet type trigger wheel. The Pro-Jection uses throttle position instead of a MAP sensor and is not appropriate for forced induction.
Mass-Flo: These are actually chipped OEM computers, usually (possibly always) based on a Ford EEC-IV.
Megasquirt: Currently, this would require a trigger wheel or HEI, too. It can work on this engine, but as different builders put different feature sets in them, be sure to talk things over with a dealer if you're buying one fully assembled.
Motec: One of the most feature loaded, and expensive, ECUs out there.
Spectre: A Megasquirt based ECU with a lot of features (and bling) added. Would require using a trigger wheel and a different IAC valve.
Last edited by Matt Cramer; 08-19-2007 at 01:44 PM. Reason: Thought I'd add some comments on different aftermarket ECMs and controls.