Emissions vs. bone stock chip?

[SpeednV6]

Are these considered to be the same chips? If not, what's different and what do I need to do to pass emissions using a bone stock chip? I've passed Illinois testing using an Emissions chip, just wondering if I can do it again with the stock chip?

[ijames]

First, of course, is injector size - you can only use the stock chip with stock injectors or the 30 lb/hr green stripes. Second, back when most emissions tests were tailpipe sniffing at idle and 2000-2500 rpm, the emissions chips raised the idle speeds to 950 rpm or so (most states had a 1000 rpm max). This doesn't really matter with the dyno tests where the test is done under load at "speed". There are a few things that can help a little, but if your engine is in good shape you should pass with the stock chip.

[SpeednV6]

Thanks for the reply. Yes, I did understand that with a stock chip, I needed stock injectors. Thanks again.

[gofstbuick]

Like Carl says, the bone stock chip requires stock injectors (and you already know that). But regarding the comments about two speed idle, most states use a single twst out of the federal test procedure. Two speed idle seems to be the simplest, so that is what most states use. Now that NOx emissions are a problem on the west coast, then dyno testing became the test of choice. But even the CA test is one test out of the federal test procedure (FTP). I think AZ uses BAR30, which is accelerate to 30mph, decel to 0 and repeat the process two more times. That is another test in the FTP. Therefore, since most state use one or more test from the FTP, then theoretically, a vehicle in good condition should pass with stock injectors and chip.

[chopped39]

I was at a tech seminar about six months ago with envirotest.and they said after february of 2007 illinios is going to stop testing cars older than 1996. They are gonna test obd 2 cars only.So lets pray they go through with that. that does not mean that we can alter any emission related components

[Ormand]

This issue is confused by the fact that there were two chips for the '87. One was recalled for emissions reasons, so there are some cars with a "bone stock" emissions chip. I don't know what the original emissions problem was, but Carl probably does. (since he provided the info on both chips for GnTType.org, he did know at one time)