glcoupeguy Posted November 17, 2009 Share Posted November 17, 2009 (edited) it has become apparent to me that i can hack OBD2. when i put my EJ20 in im undecided. the whole idea of rewiring is... a bit overwhelming, but if im gonna do it i might as well do it well. OBD2 is more work but are the added benefits of hackability and the learning experience worth it? id only like responses from people who have alot of experience with both if you dont mind. -im a digital electronics student so dont expect me to be totally in the dark here Edited November 17, 2009 by glcoupeguy Link to comment Share on other sites More sharing options...
joostvdw Posted November 17, 2009 Share Posted November 17, 2009 -im a digital electronics student so dont expect me to be totally in the dark here If this is the case then you don't have to worry. It's not that hard. You'll need wire diagrams of both the car you're swapping in and where you're swapping from and then decide which wires and sensors are essential for the engine. Stuff like fuel tank temp and pressure (which some models have for safety) are not needed. Link to comment Share on other sites More sharing options...
Numbchux Posted November 17, 2009 Share Posted November 17, 2009 need more information. OBD II subaru covers 13 years, and many many different models/engines. Link to comment Share on other sites More sharing options...
Legacy777 Posted November 17, 2009 Share Posted November 17, 2009 need more information. OBD II subaru covers 13 years, and many many different models/engines. This is very true. The early OBD2 cars are much more limited in what ECU parameters you can change/observe. One thing I would highly recommend is that you verify/test all the wiring prior to the swap, because on more than one occasion I've found the wiring diagrams provided by Subaru to be incorrect. Link to comment Share on other sites More sharing options...
glcoupeguy Posted November 28, 2009 Author Share Posted November 28, 2009 (edited) i have a harness from a 1996 which i thought was a 1995 at the time so im still undecided. incorrect schematics? thats... unprofessional to say the least. also ive seen PC based diagnostics tools. any recommendations? Edited November 28, 2009 by glcoupeguy Link to comment Share on other sites More sharing options...
idosubaru Posted November 28, 2009 Share Posted November 28, 2009 (edited) -im a digital electronics student so dont expect me to be totally in the dark hereas an engineer i suggest to not put this question on your resume for real, it's only wiring, what's your question? The later models have a few more horsepower and the nifty plug, so why not, eh? might want to describe what you mean by "hack" and what you're trying to do. in general, get a car, swap the harness into whatever you want and run it? Chux - is it really a technological marvel to go from OBDI swap to OBDII swap? It's not like it's a paradigm shift or anything right? Same basic principle. Edited November 28, 2009 by grossgary Link to comment Share on other sites More sharing options...
suberdave Posted November 28, 2009 Share Posted November 28, 2009 if you want good responce to the questions, we need more info. are you trying to put an EJ20? into an EA81 EA82 Car? what kind of EJ20 are you looking to swap, if its anything other than an EJ205 than it wont be OBD2 any how. if you are trying to put full OBD2 electronics into a non OBD2 body, this will be very hard, you will have to add pressure sensors in the fuel tank, a full Evap system, upon much more... i have done many swaps both in EA and EJ body cars. so i think i have experienance. but you need to give us more info. and if you are overwhelmed with the thoughts of OBD1 wiring, then i wouldnt even try OBD2 wiring... and lastly you use the words "Hack" OBD2? are you talking about hacking the ECU so you can retune it? if that is the case, you can add rom chips to the OBD1 ECU's and "Hack" them also... Link to comment Share on other sites More sharing options...
glcoupeguy Posted November 29, 2009 Author Share Posted November 29, 2009 if you want good responce to the questions, we need more info. are you trying to put an EJ20? into an EA81 EA82 Car? what kind of EJ20 are you looking to swap, if its anything other than an EJ205 than it wont be OBD2 any how. if you are trying to put full OBD2 electronics into a non OBD2 body, this will be very hard, you will have to add pressure sensors in the fuel tank, a full Evap system, upon much more... i have done many swaps both in EA and EJ body cars. so i think i have experienance. but you need to give us more info. and if you are overwhelmed with the thoughts of OBD1 wiring, then i wouldnt even try OBD2 wiring... and lastly you use the words "Hack" OBD2? are you talking about hacking the ECU so you can retune it? if that is the case, you can add rom chips to the OBD1 ECU's and "Hack" them also... retuning was the goal. and since the block was pulled from a 1990 legacy then i guess ill stck with OBD1, considering what you have said. and yes is goin into a 1987 three door. Link to comment Share on other sites More sharing options...
idosubaru Posted November 29, 2009 Share Posted November 29, 2009 1990 Legacy is an EJ22. Good luck! Link to comment Share on other sites More sharing options...
glcoupeguy Posted November 30, 2009 Author Share Posted November 30, 2009 (edited) actually its an n/a EJ20. theres other threads discussing that topic but they do exist and i was lucky enough to find one in a legacy. im aiming for 200hp with ej22 heads for lower compression + turbo and possibly new pistons if i cant get the compression down enough. http://www.ultimatesubaru.org/forum/showthread.php?t=104101&highlight=ej20+ej22+head this is from http://en.wikipedia.org/wiki/Subaru_EJ_engine SOHC naturally aspirated Legacy JDM 1989-1994 125 hp (93 kW) BC - BF series 1993-1999 135 hp (101 kW) BD - BG series 1998-2004 137 hp (102 kW) BE - BH series 2003-2009 140 hp (100 kW) BL - BP series DOHC naturally aspirated Legacy JDM 1989-1999 150 hp (110 kW) BC - BF and BD - BG series Edited November 30, 2009 by glcoupeguy Link to comment Share on other sites More sharing options...
Legacy777 Posted November 30, 2009 Share Posted November 30, 2009 All USDM 90 legacies had an EJ22. Link to comment Share on other sites More sharing options...
glcoupeguy Posted November 30, 2009 Author Share Posted November 30, 2009 (edited) do i have to take a picture? it clearly says [EJ20] on the block. the car was probably from canada or elsewhere Edited November 30, 2009 by glcoupeguy Link to comment Share on other sites More sharing options...
idosubaru Posted November 30, 2009 Share Posted November 30, 2009 do i have to take a picture? No, not all, he's right it just doesn't apply to your engine. What you need to do is clarify details. In the future, mention that this is a JDM EJ20 motor. That's not a USDM motor, so it leads to confusion, this being a US based board and all. JDM EJ20 - carry on. and good luck. Link to comment Share on other sites More sharing options...
glcoupeguy Posted November 30, 2009 Author Share Posted November 30, 2009 (edited) well, i found the car in the states so i wasnt considering that :-\ Edited November 30, 2009 by glcoupeguy Link to comment Share on other sites More sharing options...
idosubaru Posted November 30, 2009 Share Posted November 30, 2009 well, i found the car in the states so i wasnt considering that :-\right on, it's all straightened out now. it's easy enough to swap intake manifolds or the wiring harness from all sorts of EJ22's OBDI, OBDII, Phase I, Phase II, etc so you can do whatever you end up deciding as far as wiring goes. Link to comment Share on other sites More sharing options...
Numbchux Posted November 30, 2009 Share Posted November 30, 2009 I guarantee that it says EJ22 on the tag on the strut tower. which almost certainly means it still has the 2.2 ECU and wiring in it. so regardless of what shortblock someone threw in there at one point, still think of it as a 2.2 from the wiring standpoint. since you're doing wiring anyway. do it right, and use a standalone. you can get a used Link LEM for $500 or less if you look around. And there are other companies that make simple ECU systems that will allow you to get the most out of your motor without sacrificing reliability. The stock ECUs are pretty good at adjusting the fuel trims to compensate for extra air, right up until the injectors are maxed out. But you won't have any timing control. and that's what will make or break your reliability. Link to comment Share on other sites More sharing options...
glcoupeguy Posted November 30, 2009 Author Share Posted November 30, 2009 I guarantee that it says EJ22 on the tag on the strut tower. which almost certainly means it still has the 2.2 ECU and wiring in it. so regardless of what shortblock someone threw in there at one point, still think of it as a 2.2 from the wiring standpoint. since you're doing wiring anyway. do it right, and use a standalone. you can get a used Link LEM for $500 or less if you look around. And there are other companies that make simple ECU systems that will allow you to get the most out of your motor without sacrificing reliability. The stock ECUs are pretty good at adjusting the fuel trims to compensate for extra air, right up until the injectors are maxed out. But you won't have any timing control. and that's what will make or break your reliability. sounds good. should also simplify my task quite a bit:) Link to comment Share on other sites More sharing options...
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