I have a 97 coupe that I have totake for emissions... and I don't want to do the same gsr or b16 swap like everyone. I prefer n/a over boost too. So I'm thinking of going lsv. So seeing as I have emissions I have to pass the obd2 plug in. I know an lsv will pass if I run the gsr ecu and not throw any codes, forget what p the obd2 is. But if I put high compression pistons in the bottom, will I still be able to pass emissions on a stock ecu? I just can't throw any codes, so I was thinking that turning up the fuel pressure would straighten out how it ran?

 

As far as the engine goes, higher compression should help you pass emissions since it will burn the fuel more completely. However, I don't know enough about the ECU's to know whether or not you can tune it correctly without throwing a code. I assume you could.

 

But on a stock map I doubt it'd run good with high compression

 

What cams do you plan on trying to smog with?

 

Why run it on a stock map?

 

Cause he needs to pass CEL/MIL test for smog check.

 

How does tuning fail smog check?

 

umm OBD2

 

OP has 1997, therefore OBD2, most of us can't afford to get OBD2 tuned, so we convert to OBD1, unfortunately, OBD2 scanner will not link to OBD1 converted ecu which leads to automatic smog test fail.

 

^ Exactly. Head I'd keep stock, most likely go with a gsr head and keep the gsr cams.

 

If all they check for is CEL, then you should be mine with stock cams and stock ecu with a bit higher CR as long as all other emission sensors, etc. are connected and working properly.

 

That and the fact that OBDIIa/b is almost untunable and there's no programs i know of out that support that system.

 

Oh I didn't know you guys couldn't tune OBD II stuff. That sucks.

 

I can tune domestics OBDII..

I dont know of anyone who tunes OBDII hondas.. unless you use a full stand alone and consider that a obdII setup

 

Oh yeah, there's plenty of tuneable OBDII domestics. I didn't know Hondas were different. Is it like the Mopar stuff and the program is locked?

 

No, just honda ecu's are really....really limited..i mean you could do a option to retain the factory ECU w/ OBD2 is to get a piggy back EMS
people tune on obd1 because its easy to manipulate the sensors. 0bd2 vehicles have too many emissions variables which make it a hassle.

Its just.. dumb really to try and tune on OBDII and hack job the wiring.

 

ok so going back to on topic, i should be able to run higher compression pistons and just put on a gsr ecu just to get me to the emissions and pass?

 

GSR ECU huh.....are your running a GSR or H22 motor with butterfly valves?

 

I don't plan on it, I would probably get a s2 manifold to bypass the butterflies

 

that right there is gonna throw a code on the odb2 ecu... when you take it to get inspected couldnt you just tell them original motor blew so you had to replace it with a older motor and it was odb1???? wouldnt that kinda solve all your problems

 

^^no i believe the motor has to be replaced with the same year or newer

 

thats pretty gay your state sucks im pretty sure you can replace the motor with what ever is avalible as long as its still the same motor , you should check with your state