OBDII to OBDI Conversion
OBDII to OBDI Conversion
Aight there are a few things i want to go over with this topic. Your options of ecu's are the following:
p13 (92-95 prelude)
p28 (92-95 civic ex and one of the del sol models)
p72 (92-95 gsr integra)
www.car-parts.com is a good site to find these ecu's in the junk yards.
Conversion Harness:
There are quite a few people who offer the harness to convert to an OBDI ecu:
www.jkobd.com
www.boomslang.us
www.kingmotorsports.com (boomslang)
www.phearable.net (I can vouch for his awesome customer service and quality)
....i know there are prolly more people that make harnesses but these are just the ones off the top of my head.
NOTE:
Remember that when you are ordering the harness, be sure that you are getting OBD2A - OBD1.
Chipping and Socketing
Chipping involves soldering a socket onto the ecu board that will accept an eprom chip that can be used to overwrite the stock/modified fuel/ignition tables. These chips are rewriteable meaning you dont have to use a new chip everytime you change something. The parts to chip/socket an ecu can be found here: http://www.moates.net/product_info.php?products_id=42.
Extra INFO on the ways of tuning:
aight i wanted to add how the actual process of burning the chips, etc is done.
When the tuner (or you) is making adjustments on the motor he is using an Ostrich.
http://www.moates.net/product_info.php?products_id=57
The Ostrich is used to complete the tune; it is connected from computer to the ecu during tuning. Once the tune is done via laptop, you plug a programmer into the USB of the computer. http://www.moates.net/product_info.php?products_id=48
The programmer burns the info from the computer onto the eprom chip that is to be placed onto the socket in your ecu after tuning is complete.
P13
The p13 ecu again is from the 4th gen Prelude (92-95) H22. When it comes to tuning this ecu, its very limited compared to the p28 and p72. www.hondata.com has support for the p13 but like i said, it has very limited tuning adjustments compared to the other two.
Here is how to convert a p13 from auto to manual:
http://www.pgmfi.org/twiki/bin/view/Lib ... AutoManual
P28
This comes from the 92-95 civic ex. This ecu does not read for EGR and knock sensor and does not (from the factory) have the ability to control the secondary intake valves (IAB's). You can however manipulate the ecu to control them by doing a couple simple steps. If you do not remove the iab valve and plug in this ecu, you will lose a good amount of power after 5500 due to the valves not opening. I removed the valves by taking off the plenum of the intake manifold and simply unscrewing the valves from the shaft and leaving the shaft in place.
If for some reason you cannot find a manual transmission p28, dont worry...its ok. The auto ecu can be manipulated very simply to become a 5 speed ecu.
go here to see how to go from auto to manual with a P28:
http://www.pgmfi.org/twiki/bin/view/Lib ... AutoManual
The conversion to make the p28 control the IAB's can be found here:
http://www.pgmfi.org/twiki/bin/view/Library/AddIABToP28
The p28 is the cheapest and most abundant when compared to the p72.
P72
This comes out of the 92-95 Gsr integra. It retains all functions of the p13 which means you dont have to remove the iab's or modify the ecu to be able to control them. This ecu, in most cases, is much more expensive than the p28. Generally, its 50-100 dollars more expensive. Technically, this is the best ecu use sense it retains all the sensors, but for the extra price you pay for it, you could have the p28 modified to do a certain task and not hurt your wallet as much.
Tuning:
Now that you have acquired the ecu (with a basemap) and a conversion harness, you are ready to install it. The Ecu and harness are plug and play....meaning you disconnect your factory ecu from the factory harness, plus the conversion harness into the factory harness, then plug the conversion harness into the ecu. At this point you are going to need to be on a search to find someone who can tune with whichever program you decide to run. Whether it be hondata, crome, ectune, neptune..etc. The fuel/ignition map (basemap) that comes with the ecu is ONLY a safe map that will allow you to drive from point A to point B until you get a tune. I HIGHLY suggest not putting the engine under any excessive loads (wide open throttle). During this period of time, you are going to want to treat the engine as a "normal/sane" person would drive. In most cases, that means going to speed limit, LOL.
The Hondata link i have below has a list of dealers who are authorized to deal with it. In most cases, anyone who can tune with hondata, will be able to tune with pretty much any other program.
Ectune Tuners
http://ectune.com/AuthorizedTuners/tabi ... fault.aspx
Neptune Tuners
http://www.hrtuning.com/pages/category/dealers
For more extra info if you want to explore yourself view these related sites and have a look around:
www.pgmfi.org
www.phearable.net
www.hondata.com
www.hrtuning.com
www.moates.net
www.tunewithcrome.com
http://www.efi101.com
http://www.ectune.com
Hope this helps :p
----------
Courtesy of 98vtec via PreludePower
p13 (92-95 prelude)
p28 (92-95 civic ex and one of the del sol models)
p72 (92-95 gsr integra)
www.car-parts.com is a good site to find these ecu's in the junk yards.
Conversion Harness:
There are quite a few people who offer the harness to convert to an OBDI ecu:
www.jkobd.com
www.boomslang.us
www.kingmotorsports.com (boomslang)
www.phearable.net (I can vouch for his awesome customer service and quality)
....i know there are prolly more people that make harnesses but these are just the ones off the top of my head.
NOTE:
Remember that when you are ordering the harness, be sure that you are getting OBD2A - OBD1.
Chipping and Socketing
Chipping involves soldering a socket onto the ecu board that will accept an eprom chip that can be used to overwrite the stock/modified fuel/ignition tables. These chips are rewriteable meaning you dont have to use a new chip everytime you change something. The parts to chip/socket an ecu can be found here: http://www.moates.net/product_info.php?products_id=42.
Extra INFO on the ways of tuning:
aight i wanted to add how the actual process of burning the chips, etc is done.
When the tuner (or you) is making adjustments on the motor he is using an Ostrich.
http://www.moates.net/product_info.php?products_id=57
The Ostrich is used to complete the tune; it is connected from computer to the ecu during tuning. Once the tune is done via laptop, you plug a programmer into the USB of the computer. http://www.moates.net/product_info.php?products_id=48
The programmer burns the info from the computer onto the eprom chip that is to be placed onto the socket in your ecu after tuning is complete.
P13
The p13 ecu again is from the 4th gen Prelude (92-95) H22. When it comes to tuning this ecu, its very limited compared to the p28 and p72. www.hondata.com has support for the p13 but like i said, it has very limited tuning adjustments compared to the other two.
Here is how to convert a p13 from auto to manual:
http://www.pgmfi.org/twiki/bin/view/Lib ... AutoManual
P28
This comes from the 92-95 civic ex. This ecu does not read for EGR and knock sensor and does not (from the factory) have the ability to control the secondary intake valves (IAB's). You can however manipulate the ecu to control them by doing a couple simple steps. If you do not remove the iab valve and plug in this ecu, you will lose a good amount of power after 5500 due to the valves not opening. I removed the valves by taking off the plenum of the intake manifold and simply unscrewing the valves from the shaft and leaving the shaft in place.
If for some reason you cannot find a manual transmission p28, dont worry...its ok. The auto ecu can be manipulated very simply to become a 5 speed ecu.
go here to see how to go from auto to manual with a P28:
http://www.pgmfi.org/twiki/bin/view/Lib ... AutoManual
The conversion to make the p28 control the IAB's can be found here:
http://www.pgmfi.org/twiki/bin/view/Library/AddIABToP28
The p28 is the cheapest and most abundant when compared to the p72.
P72
This comes out of the 92-95 Gsr integra. It retains all functions of the p13 which means you dont have to remove the iab's or modify the ecu to be able to control them. This ecu, in most cases, is much more expensive than the p28. Generally, its 50-100 dollars more expensive. Technically, this is the best ecu use sense it retains all the sensors, but for the extra price you pay for it, you could have the p28 modified to do a certain task and not hurt your wallet as much.
Tuning:
Now that you have acquired the ecu (with a basemap) and a conversion harness, you are ready to install it. The Ecu and harness are plug and play....meaning you disconnect your factory ecu from the factory harness, plus the conversion harness into the factory harness, then plug the conversion harness into the ecu. At this point you are going to need to be on a search to find someone who can tune with whichever program you decide to run. Whether it be hondata, crome, ectune, neptune..etc. The fuel/ignition map (basemap) that comes with the ecu is ONLY a safe map that will allow you to drive from point A to point B until you get a tune. I HIGHLY suggest not putting the engine under any excessive loads (wide open throttle). During this period of time, you are going to want to treat the engine as a "normal/sane" person would drive. In most cases, that means going to speed limit, LOL.
The Hondata link i have below has a list of dealers who are authorized to deal with it. In most cases, anyone who can tune with hondata, will be able to tune with pretty much any other program.
Ectune Tuners
http://ectune.com/AuthorizedTuners/tabi ... fault.aspx
Neptune Tuners
http://www.hrtuning.com/pages/category/dealers
For more extra info if you want to explore yourself view these related sites and have a look around:
www.pgmfi.org
www.phearable.net
www.hondata.com
www.hrtuning.com
www.moates.net
www.tunewithcrome.com
http://www.efi101.com
http://www.ectune.com
Hope this helps :p
----------
Courtesy of 98vtec via PreludePower
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