Haltech What is a haltech?
09-15-03, 10:28 PM
#3
Wait................What?
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My best understanding is a 'stand-alone' ECU... meaning it replaces the stock ECU... more HP I guess, and is tuneable... so no need for a S-AFC correct?
I also would like to know, but that is what I have picked up so far.
I also would like to know, but that is what I have picked up so far.
09-15-03, 10:58 PM
#4
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Max posted an excellent reply to this question in the Canadian forum.
ORIGINALLY POSTED BY MAXTHE7MAN:
super air flow converter...
Basically the stock ecu has a series of maps that it looks up the fuel and spark requirements in, it takes various readings of various sensors and cross references the inputs from those sensors to provide the engine with the proper amount of fuel and when to provide spark when it needs it.. Now the system we have is version of the mas airflow system with a twist, the flapper door contraption in our cars is not a true mass airflow sensor, it is actually a velocity meter, and by having a certain velocity in a given sized duct or tube, the cfm can be calculated, any changes in the intake tract actualy throw off the system in our cars, as changes in airbox ,tid, etc change the velocity to a degree in the intake tract,thus changine the data that the ecu is using to provideamountof fuel, we us an S-afc to fool the signal to the ecu from the flapper door, it interupts the signal and changes it a percentage amount under a changin condition, some tie the s-afc into the boost sensor, others a TPs, thus we have no access to the actual maps just the we are able to guide the computer to a different map for fuel requirements..
Now with the haltech and microtech etc, it completley replaces the stock ecu, giving you open ended controlover all aspects of engine operation, in other words, you now have access to the maps, you have to create the map yourself, its alot of work, but keep in mind the mapping on the stock ecu is biased towards emissions so there is alot of hp to be found in stand alone efi tuning.. Now we have changed though from a mass air flow system, to a speed density systemwith the haltech, so that means we derive points on the fuel map from manifoldpressure, corrected by temperature and engine speed, this allows to point the computer to a map, without and airflow meter.. And as bonus we now have full control over the ignition system as well, not just being able to to tug the map around with an add on box like an ITC but we now define the spark maps ourselves under all conditions..
If you are going for maximum hp, you need a standalone system....If you need too keep emissions there are halfway systems like the hks fcon pro and stuff that allow you to change the maps but keep the emissions switching of the stock ecu active, nice for places like the US or Japan, but no neccesary in Canada(yet)....I personally like full stand alone with full control over the car, it allallows you to control even the most heavily ported engine easily and make it streetable, also there are auxillary outputs on the standalone that give you N20 control, fans, idle, cold start, etc etc..
END QUOTE
Nima
ORIGINALLY POSTED BY MAXTHE7MAN:
super air flow converter...
Basically the stock ecu has a series of maps that it looks up the fuel and spark requirements in, it takes various readings of various sensors and cross references the inputs from those sensors to provide the engine with the proper amount of fuel and when to provide spark when it needs it.. Now the system we have is version of the mas airflow system with a twist, the flapper door contraption in our cars is not a true mass airflow sensor, it is actually a velocity meter, and by having a certain velocity in a given sized duct or tube, the cfm can be calculated, any changes in the intake tract actualy throw off the system in our cars, as changes in airbox ,tid, etc change the velocity to a degree in the intake tract,thus changine the data that the ecu is using to provideamountof fuel, we us an S-afc to fool the signal to the ecu from the flapper door, it interupts the signal and changes it a percentage amount under a changin condition, some tie the s-afc into the boost sensor, others a TPs, thus we have no access to the actual maps just the we are able to guide the computer to a different map for fuel requirements..
Now with the haltech and microtech etc, it completley replaces the stock ecu, giving you open ended controlover all aspects of engine operation, in other words, you now have access to the maps, you have to create the map yourself, its alot of work, but keep in mind the mapping on the stock ecu is biased towards emissions so there is alot of hp to be found in stand alone efi tuning.. Now we have changed though from a mass air flow system, to a speed density systemwith the haltech, so that means we derive points on the fuel map from manifoldpressure, corrected by temperature and engine speed, this allows to point the computer to a map, without and airflow meter.. And as bonus we now have full control over the ignition system as well, not just being able to to tug the map around with an add on box like an ITC but we now define the spark maps ourselves under all conditions..
If you are going for maximum hp, you need a standalone system....If you need too keep emissions there are halfway systems like the hks fcon pro and stuff that allow you to change the maps but keep the emissions switching of the stock ecu active, nice for places like the US or Japan, but no neccesary in Canada(yet)....I personally like full stand alone with full control over the car, it allallows you to control even the most heavily ported engine easily and make it streetable, also there are auxillary outputs on the standalone that give you N20 control, fans, idle, cold start, etc etc..
END QUOTE
Nima
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10-07-03, 06:57 PM
#8
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Originally posted by Warehouse
Is it possible to order them pre-programmed for a stock car and upgrade from there?
Is it possible to order them pre-programmed for a stock car and upgrade from there?
1) The Haltech EMS products use a different method of sensing the airflow, which is more sensitive to different cars than the stock system. Therefore, an ECU map that would work for one car would not run another in quite the same manner. Close, but not the same.
2) The Haltech EMS products cannot control ALL of the functions of the stock ECU, and therefore is not capable of running the car exactly like stock. All aftermarket EMS products are currently like this. They are getting more advanced every year, so maybe some day they will be able to do this.
A standalone EMS is a very advanced tuning tool that is not intended for those who do not have a good understanding of internal combustion engine theory. If the following looks like jibberish, then you need a professional tuner: BSFC, IHP, BMEP, Lambda, EGT, ATDC, BDC. If you think that a simple tool like a wideband O2 display can make a novice into a pro tuner, then you may as well save your money and just drive your car off a cliff right now, lol. Most people need to set aside an additional $500 or so for professional tuning.
Last edited by Evil Aviator; 10-07-03 at 07:01 PM.
