DEQ/air injection question.

[TeamCF]

I'm getting ready to go through the DEQ (I'm just in the line out here) before the end of the month.

'83 GL EA81.

 

I know I have to put a new CAT on it. Got an old Y-pipe given to me from an EJ swap I'm gonna try first with a "good?" CAT. I'll buy a new one if it's shot.

 

But my real question is about the air injection.

My current engine has it all removed. And last time they didn't even look under the hood but it was on and not blocked off with the "$.50 fix".

That old engine had a brand new CAT on it that died a crunchy death the second time I took it up FB5, passed with flying colors.

 

Will it make that much difference on the sniff test?

I know I've read that chances are it's not working right anyway after all these years.

 

I still have it on the old engine sitting on the stand in the garage. (nuts at the heads don't want to let go though, reason I didn't just transfer it over during the swap, and the reason I've kept the old engine around)

So I can proly get it transfered over if I have to.

 

Just trying to make this as quick and painless as possible. Especially after they almost doubled the DEQ/tag fees in Portland. And I went and waited til the last couple weeks my tags are good to think about it.

 

Did some searching but didn't seem to find the answer I needed.

Did find some stuff about a 50% alcohol mix that seemed like a last resort though........

 

Any input would be great.

[GeneralDisorder]

My experience has been that it won't make enough of a difference to mean you won't pass. If the cat is working, the AIS gives it about a 10 to 20% boost in efficiency - or so it would seem from my emperical observations. When I went through with my Brat several years ago it wouldn't pass till I replaced the cat - with the AIS working vs. not the numbers only went down maybe 10% at cruise with no change at idle. Once I installed another y-pipe with a better cat the numbers came WAY down. Like half what they were with the old cat. AIS didn't seem to make much difference.

 

Also - if you are installing an aftermarket cat such as from ebay, etc - the newer 3-way catalyst's in them don't require the AIS at all. Since the early 90's smog pumps and AIS systems have not been needed due to better catalyst designs. In fact I would be willing to bet that a y-pipe from an SPFI EA82 would eliminate the need for the AIS on the EA81 as post-carb models have no such system or smog pump of any kind.

 

GD

[TeamCF]

Cool. Thanks for the reply.

 

The used Y-pipe I have may or may not do the trick. If not I'll order up a new generic CAT and weld it in.

 

I know what I'm doing next week.