Mt.HOODrat wrote:i know i am excited about this, i just read up on robs ej20g thread, i was searching all over for a cheap tuning solution, and found his threads and was so relieved... but he hasnt posted in a month, im sure he's just a busy guy with a life and a job haha. although that would be unfortunate if he pulled a revtronix on us all haha. BSOD would have to write a "legacy of Rob" thread...
Dang...this thread too?
I don't have much to update. I am arranging to borrow a local donor car to test this on. I won't make it available until I have solid data. Bench data is one thing, miles on a real car is another. Hopefully I will have the car this weekend. No promises though.
Thanks to Drew for dropping his car off yesterday. I have been out of town a lot last month. Hopefully I can wrap up testing of the prototype in the next couple of weeks.
Another update void of real news has been added to the first post
I thought you all would enjoy this picture. Yes that logic analyzer is about 10 years older than the car. lol. Have I mentioned recently how much I hate the fact that the ECU is right under the dash?
Have I mentioned how much I hate the location of the ECU as well? Not only it's whereabouts but the fact that it's jammed up there and pretty much requires disconnecting of other connectors below it just to remove it and the screws are ridiculously hard to get to.
98 Metro Hatch Daily Driver :)
91 SS EJ20G Engine/Tranny/Diff Swap Build Thread Here
"Your testes are close to your bottom but you still play with them all the time." Jeremy Clarkson
I'm interested in this as well. But only if it will simplify my current dual ignitors-under-the-dash setup.
98 Metro Hatch Daily Driver :)
91 SS EJ20G Engine/Tranny/Diff Swap Build Thread Here
"Your testes are close to your bottom but you still play with them all the time." Jeremy Clarkson
I finally figured out why the proto wasn't working correctly wired into the car. It was a tough nut to crack. Basically what it comes down to is that I didn't properly characterize the signals used between the ECU and igniter and made assumptions based on my experience with Toyota parts. Once I figured out why the chip wasn't behaving correctly, I dug out the O-scope and verified, which I should have done first thing! It is an example of sloppy engineering; bad on me! I need to add a couple electrical components and it should be good. Parts are on order and will be able to pick up testing in a few days. I also found the correct source for ECU connector crimp terminals. This will greatly simplify installation.
With the correct part numbers you can get all the connector housings and the ECU PCB mount connector as well. I don't have all the part numbers in front of me, but I picked up a spare of the 26 pin connector to verify. That part is; http://components.arrow.com/part/detail ... 24738N1145
Yes this does mean cheaper DIY patch harness are possible.
That's good to know about the connectors & housings. That will definitely give some additional options for making your own patch harnesses.
I've got a craftsman crimp tool with several different crimp jaws that would probably work. I just didn't know if there was a specific tool for these little connectors.
98 Metro Hatch Daily Driver :)
91 SS EJ20G Engine/Tranny/Diff Swap Build Thread Here
"Your testes are close to your bottom but you still play with them all the time." Jeremy Clarkson
lol my car died in heavy traffic again going up to seatac to take my friends to the airport. The road up there is pretty unforgiving with it's horrible bumps.
98 Metro Hatch Daily Driver :)
91 SS EJ20G Engine/Tranny/Diff Swap Build Thread Here
"Your testes are close to your bottom but you still play with them all the time." Jeremy Clarkson
After yet another complete circuit re-design, I am happy to report my prototype is up and running. I don't want to jump the gun and call it done until I get some good road miles first, but all looks solid. It starts, idles and revs perfectly on both the EJ22T stock ECU and the EJ20G ECU. Once I am satisfied after driving it I will finish up my PCB design and order parts for production.
Good the hear Rob. I've sent you a couple emails and a texts and I haven't heard from you in weeks. I need to know if I can run a twin turbo legacy JDM MAF on my car with your tune. I know it's a slightly larger diameter MAF and I don't know if it reads differently or not. I should have it any day and I want to put it in my car because it will allow me to go back to a factory airbox setup and ditch my cone filter.
98 Metro Hatch Daily Driver :)
91 SS EJ20G Engine/Tranny/Diff Swap Build Thread Here
"Your testes are close to your bottom but you still play with them all the time." Jeremy Clarkson
I was out of town nearly all of last week. I'll ping you on email later. In general, no don't use a different MAF, and the stock ej20g green MAF fits the stock airbox just fine. I have swapped one in myself on Drew's car. Perhaps it deserves it own thread and I can post pictures.
That's the problem, I'm not using the stock airbox since I have under-the-manifold intake. I'll email you.
98 Metro Hatch Daily Driver :)
91 SS EJ20G Engine/Tranny/Diff Swap Build Thread Here
"Your testes are close to your bottom but you still play with them all the time." Jeremy Clarkson
