So you've bought youself a JDM twin turbo eh?

[Reuben]

At this point really your only options are getting second hand aftermarket japanese pipes, or getting something custom made.

Keep in mind if you change the spool characteristics of the TT’s too much, its possible to run in to code 66. But my advice here is send it, and cross ya fingers/deal with it if it does pop up.

Good news is it turns out you can run sequential TT now on a Link ECU, thanks to yours truly pesting the engineers there. We just need to validate it on a few cars. For now it’ll just come in the form of a tweaked base map, and instructions on how to wire it. In future i hope to get it implemented as a feature. (I work at Link now btw lol, didn’t take me long to get TT going lol).

[Fuga350GT]

All JDM BE/BH’s are OBD-II, but you are right, they are different to international. The early A/B/C is what youll see called “J-OBD”, and regular scan tools will not be able to communicate, or only get codes and nothing else. D’s though are closer to worldwide OBD-II and should have more universal data. But you will still get better results with a J-OBD scanner.

If you want a scan tool, get a launch off ali express, launch have an official store on there, the CRP129 is a great tool for these J-OBD JDM cars.

Tuning wise, all BE/BH TT’s are tunable, but once more, A/B/C cars are trickier. I can not help here. There are guys in NZ that tune them, but they guard their secrets. You’d need to find what tool they use, and what ecu definitions they are using. Be aware there can be like 10 different definitions for a given model year based of trim, trans etc etc.

The Rev D cars are kin with the Version 7 bug eye GD, so its much more straightforward. But still beyond what i have ever done. I work for Link so obv my recommendation is gonna be get a link!

Ruben, with the Link ECU's can I still run a TT setup AND it should be able to communicate via regular OBD II emission measurements? I got my hands on a nice Rev D - and my local DMV will only smog it if it can hookup to the OBD2 module and measure the outputs.

PS, I presume that I can also replace a Rev A - C ECU with a Link ECU and accomplish the same results above?

[Reuben]

I’m going to guess that no, the Link can not output OBD based emmisions data for your local inspection.

What runtimes do they measure for smog?
Does the early J-OBD have that data, can they even connect to the stock ECU?
And is the vehicle not exempt from it due to the nature of its 25+ year import?

I know some states they only want to look at certain numbers like lambda for exampme, which you will be able to display with link software, so it may require sweet talking/getting friendly with local inspectors so you’d be allowed to use the Link software in leu of OBD, bet depending on state rules that may or may not be allowed.

I’ll ask the engineers at work about OBD-II.

[Fuga350GT]

I’m going to guess that no, the Link can not output OBD based emmisions data for your local inspection.

What runtimes do they measure for smog?
Does the early J-OBD have that data, can they even connect to the stock ECU?
And is the vehicle not exempt from it due to the nature of its 25+ year import?

I know some states they only want to look at certain numbers like lambda for exampme, which you will be able to display with link software, so it may require sweet talking/getting friendly with local inspectors so you’d be allowed to use the Link software in leu of OBD, bet depending on state rules that may or may not be allowed.

I’ll ask the engineers at work about OBD-II.

Seems to me if that was doable, an updated ECU could be a solution to some of us in weird bureaucratic voids of jurisdictions. Specifically Clark County(Las Vegas proper), is one that is truly dumbfounding. Only 1996 or older MFG'd vehicles can be tested with the tailpipe sniffer. If a vehicle is 1997 or newer it must, no exceptions, be done through OBD2 port, yes, even if it is does not have OBD2 capable port. I haven't done followup research but I'm thinking all USDM vehicles for the most part must've been required to be OBD2 compliant as of 1997 or newer. Unfortunately that little silly statute, with what seems to be an arbitrary cut off date was made without foresight to the current predicament many of us are now in.

I'd imagine the various regulatory bodies with oversight of the environment/pollution control are required to publish what and how the emissions interface works, since equipment manufacturers are also making the software & interface devices to sell to the certified but still privately owned Smog Test providers.