Well, as the title states, the 7 didnt do so hot..to be expected i guess but i was hopefully. I did fresh oil, plugs relatively new...but i guess im running hella rich afr.

I was thinking of throwing in my stock ecu just for the etest, my mods are:
Hks full exhaust, cat still intact, intake, vmount, airpump still working...

some areas i was brain storming...should i keep the o2 feeback on? off? does it matter?

any ideas would be great, i know i have to put her away soon but i was hoping to go until nov....stickers expire on the 6th....

helppp pls...lol

 

PM me we'll talk.

Mark

 

Can you post up the test results so we can see what areas the car failed in? I would say if you put the stock ECU back in it would probably pass without too much trouble. Also take it for a really hard drive before you go to the test. That way the catalytic converter will be up to temp and lit and the engine will be at full operating temperature.

 

I passed the curb idle test...

Failed ASM2525 Test:



HC ppm Limit 60 Reading 412..lol Result : Failed
CO% Limit 0.33 Reading 1.96 Result : Failed
NO ppm Limit 450 Reading 0 Result: Passed
RPM 2850 Valid
Dilution 15.7 Valid yeah hella rich

Yeah ill try the stock ecu hopefully give me a little more acceptable results....heres hoping. If not then early hibernation for her

 

After failing a couple of times I squeked by my E test by 1 ppm!

Some things that were done was lean the fuel out. Make sure the car was freaking hot! And then did the test in 2nd gear to keep the RPM's up high. For some reason my car got dirtier with a slightly less RPM.

Since my car is a jdm FD I am contemplating putting in an EGR in hopes that it will help on the next test.

 

The only thing an EGR valve will help is your NOx levels. If you are trying to help you HC and CO levels there's no point.

 

+1. Your NOx was great, so no gains to be had there by adding EGR; your NOx may rise with a leaner mixture, but is unlikely to become an issue. You're just way too rich.

 

Exactly How OLD are those Intact Catalytics?
if it is Stock,and as old as the car,Change the damn thing,,it is Burnt.toast..
Post up the Year if Car also Please,as some Guys have different methods for different series of cars.

 

yeah the cat is as old as the car......car is 93 FD R1

 

I'm not sure how they relate to emissions but I had a couple of non working solenoids in my rats nest. Perhaps they were part of my problem when I tested my car. Also if its a JDM maybe adding an EGR would help as well.

Just throwing out an idea, looking for feedback......

Can you modify the air pump ( like putting a smaller pully on it ) so that it pumps more air? That essentially would dilute the mixture of air coming out the tail pipe. That might help to reduce the ppm as more air is in the mix. Any ideas?

 

EGR has already been covered earlier in this thread as non-useful - EGR is used to reduce NOx levels by cooling the peak combustion chamber temps by circulating inert gas (already burned mix) back into the intake charge, diluting it. The OP's issue is very high CO and HC levels - and cooling the peak combustion temps in this case might actually hurt his HC and CO levels further.

Verifying the cat is not melted or otherwise NG is important, and if the answer isn't there, he needs to lean his mix a fair bit.

The air pump isn't going to be able to fool the test - the air pump puts out nothing close to the volume the engine does (1.3L displacement every complete cycle- or 2.6 if you use the formulas motorsports bodies do to handicap rotaries!). The air pump is just there to supply fresh air to the cat so it can complete combustion of unburned HC's in the exhaust, which this one is not. Either because HC levels are so high it can't keep up, or because it is damaged.

 

You can test your catalytic converter. All you need is a good infared laser thermometer. You can pick them up at princess auto for like $50. Take the car out for a good hard drive and make sure the car is well up to operating temp. The catalytic converter should be sitting somwhere around 600 degrees celcius. Measure the temp infront of the converter and after the converter. the temperature should be about 100 degrees hotter at he back of the converter.
I would say the issue here is just the car is running too rich. (parr for the course for a modified Rx-7) It is possible the catalytic converter is worn out but that is just because the engine is overfueling it. Putting a new cat on may solve the problem for now but come next etest you'll have to put another one on.

 

If you're running an untuned Power FC, it explains why you failed. They're set up rich and safe. Unfortunately, it sounds like your car may need a tune. There is no reason why a tuned map with properly-functioning emissions control components cannot pass emissions. Stock cats may be big and clumsy, but they still have quite a bit of capacity and are quite durable. Changing the plugs to stock 7s and 9s would also help, in case you're running all 9s.




I think Double_J was referring to his high NO levels. I was there assisting him during the three attempts with my portable exhaust gas analyzer. The limit is 460 and he came in at 459 or something like that. His NO level was also affected by an overheated exhaust, I'm sure.

 

Make sure your cat is an actual cat, and not just a shield.

I found that one out... "15x over WTF?"

 

By those numbers your cat is fried. And I will bet my left nut on it. Theres no way in hell even an RX7 with a healthy cat would blow those numbers.

The dilution is the dilution of the exhaust combined with carbon dioxide it means nothing really its not of any concern.

If you wanna know more PM me I am "certified." I'll tell you what I'm talking about if and when you PM.

 

His cat may very well be done for, but it is not the cause of the problem. You can put on new cats till you are blue in the face, if the engine keeps pouring fuel to it the cat will fail again. Fix the root problem first.

 

Couldn't have said it better myself

 

Cats don't die they're killed.

Of course fixing the root problem is simply implied when replacing a catalytic converter. I always do it so I even forget to mention it now.

 

Let me guess, you go to conestoga college and Jerry is your teacher?

 

My cat has run away and my wife put up signs. Has anyone seen my ***** cat?

 

Que? I didn't mean to sound like a smart *** though my bad.

 

No, no, that's not what I meant by that. My teacher at trade school says the exact same thing word for word. Converters don't die they are killed. That's why I wondered if that is where you go to school. No ill feelings were meant by any of my posts.

 

I was just going from the OP's posting that reading NOx was 0. If in fact it was a high, barely pass, overheated/overworked cat still sounds likely, although again, EGR might not help that much, if the cat's overheating from rich mix, lowering peak combustion temps may not affect it if the NOx formation is in the exhaust.

Somewhat as an aside - my '96 OBII Passat VR6 eliminated EGR, although I don't know if that's a trend in more modern cars. My '95 Passat had it. I've kind of assumed with more modern engine management it was less likely to be needed - assuming the engine management's been tuned.

 

The other thing you could do is see if the tech will run it on the dyno while you're sitting in the passenger seat yanking fuel out of it with a laptop....

 

Oh okay lol no I go to Cenntenial I'm level 1 were not even talking about emission systems yet.