Hello, I need some emissions help! Please see this webpage that I made for you guys!

http://www.zeroglabs.com/rx7/emissions.htm

Thanks a bunch!

Brian

 

Ahhh....street ported...not good for emissions..
No ACV..definately not good for emission...the acv is part of the secondary injection system...you kind of need it.

 

Right, but I"ve got an electric pump rigged up that pumps all the time. (once I flip the switch). I think that this should account for no ACV.

Thanks
Brian

 

What about putting 2 cats on? Add an airpump?

I've heard that adding ethanol to the tank can help out with emissions, and considering that the combustion of ethanol produces pretty much no harmful stuff, it's worth looking into.

As far as your goal here...You either need to add more outside (fresh) air to the exhaust (post DP) to make the exhaust more "diluted", or you need to clean that crap out of there (this is the EGR deal, but being in MD you've likely removed/disabled this), hence my reason for saying 2 cats. I've never managed to get an answer to that, but if you think about it, the gasses passing through the cat only have so long to be catalyzed and changed from bad to good gasses, so if you extend that time, maybe it'll help the situation (of course, I'm no scientist, so what the cats actually do to help this may not help your particular situation).

Worth investigating though...

 

If you still have it I would atleast throw the stock catback on and some "emmisions pass" in it. Maybe you could tune the PFC down too.

I guess that isn't really to bad for a street ported single turbo 7.

 

Your are ported..depending on the aggressiveness of the port you are going to get bad emissions numbers no matter how much air you are pumping.. What you need to do is set the PFC commander on trace and watch what cells you are in during the test...If might be a good idea then to go back into the fuel cells on the commander and remove some fuel for the testing purposes only...I know in california the standards are much stricter and I was basically a gross polluter at the 2500 rpm test because my PFC was dumping extra fuel...

Johnny

 

Why not totally disconnect the secondary throttle linkage, this way only the primary ports are used.

Also set the boost to the lowest yo can go.

 

OK here's my new plan:

I disconnected the secondary throttle linkage (15 seconds!)
I will run about 15% ethanol in my tank
I will also reset the PowerFC settings (since I know I added a decent amount of fuel from 2000 rpm and higher)
I will also encourage the tester guy to keep the RPM a little higher than normal (I am thinking that this will help keep the cat hot)

They don't push the car hard enough to get into boost, so that's not an issue.

 

yes do all that...but if you get a couple runs in the triple digit area before you go there, you shouldn't need to run at higher rpms...cat will be plenty hot

Johnny

 

Based on experience go with the alcohol. I was failing just like you, my car is not really modded but the Phoenix test is tighter than yours. We are like 1.0 on HC and 12.0 on CO. I failed both first time. I found a couple things wrong and fixed them (still failed both). Disonnected the hose from the charcoal purge that put me at .65 HC and 12.99 CO still failing. Then I ran three bottles of 99% rubbing alcohol in about a half tank of gas. Next test was .2HC and 4.7 CO they did a quick pass. It does work. Good luck

 

Hello,
It has been a few months since I posted this and thought I'd
follow up.

I got my car retested today and passed with flying colors!

To make a long story short, I took the car in today to Maryland
Emissions (dyno type test; it failed a few months ago) with 16%
denatured alcohol in the tank and it passed with flying colors. The
only 4 things that had changed since the first test were:

1) Engine was new with less than 150 miles on it before... now it's over
1000 miles
2) Did not have any alcohol in the tank before
3) Different driver at the test facility
4) Engine was more fully warmed up this time

New results (compare to those below)

Hydrocarbons - Limit is 1.1 grams/mile - I had 0.07 grams/mile (96%
reduction from first test)
Carbon Monoxide - Limit is 20 grams/mile - I had 1.33 grams/mile (94%
reduction)
Oxides of Nitrogen - Limit is 2.3 grams/mil - I had 0.07 grams/mile (65%
reduction)

So what does all this prove?

o Don't take a fresh rebuild to the test.
o Warm it up well. At least 30 minutes of highway driving if possible.
o Alcohol probably helps somewhat.
o The test isn't very standard at all (my guess). I've taken my other
RX-7 there two times with no changes to the engine/exhaust and gotten
completely opposite results before.

Sooooo there you have it!

Brian

87 TII
93 R1 T04S