I have a TPIS ZZ409 Cam and the cam duration is 287/287 @ 50 is 226/226 with 520/520 lift I live in a state that requires you to go through emissions. I have been unable to pass and have tried many things to pass but still have yet to pass emissions . Does anyone else have this cam and is able to pass emissions? If so what did you do to make it pass? I want to keep the cam in the car but I have to pass emission to keep it on the road. Any comments? or sugestions?

 

I think a double cam swap is in your future

 

Yes that is a option but is one I hope that I dont have to take. The reason I chose this cam is based on how my heads flow.
IN EX
100 75 51
200 147 105
300 198 159
400 241 192
500 263 215
550 261 223
600 261 231

I have contacted Tpis and they said they do not know if it will pass but it is possible. They said I should start with my heads not the cam. Because the heads are not scavaging the ex. So I would like to know if anyone has pased with this cam if so maybe I should start with the heads. the part of the emissons test that I am failing is the HC 853 ppm I need to be under 220.

 

Did you get your PCM reprogrammed?That cam should be able to pass With a decent tune.Try PCMforless.

 

I have had progaming and it was done by pcmforless I have just added a LT4 KM I dont know if that is going to help but it is worth a try the worst that could happen is I will fail agian.

 

Ok, my grandfather lives an an emissions state and swears that he used to get cars to pass by adding a bottle to alcohol to a full tank of gass but DON"T take my word for it. I've heard that elsewhere though; I've just never actually seen it work. I'd try doing a good fuel-sytem/top of motor cleaning like Seafoam to get the cylinder heads working. Possibly changing to a lower ratio rocker would help and be easier than a cam swap. Also, try having PCM4less give you a temporary tune that runs REALLY lean. Are you running an aftermarket ignition system? Any sort of cat? Are you bringing the car to them hot? Not being so lucky as to be in a smog state, I'm just throwing out ideas here, but I haven't seen anyone else do that.

 

cliff929, how about some details, which test is it, what you’re #’s are/how much you failed by, anything that you know of wrong with the drivetrain…?

There’s plenty of people passing both idle and treadmill tests with bigger cams then that, really, that shouldn’t be hard to do, so maybe if we had more information we could tell you what’s wrong.

WRT to the alcohol, yes, it works. A couple of bottles of drygas has the same effect (usually alcohol also), basically it confuses the ECM into running a little lean since you need more alcohol then gas to mix with the same amount of air. It also burns extremely clean.

 

I have a MSD6AL Ingition. as far as the emissions test the part I am failing is the HC max allowable is 220 I am at 853 the test is an idel test and 2500 rpm test. the tempeture on my car at time of test was 230. As far as I Know the engine is in great condition only 37000 miles. I have been told by tpis it would probable be my heads because of what they flow on the EX. So that is the reason I am asking does anyone have this cam and can pass? It has a single pattern cam. and from what I hear they do not run as clean as a duel pattern cam. And it idels around 1000 rpms. Although I have not passed emissions it gets 50 miles more per 15 gallons of gas on the interstate than it did bone stock?

 

You're barking up the wrong tree...

High HC is usually an indication that you're running way rich, not getting enough ignition advance or have another ignition problem, meaning that something is messed up (could be an assortement of faulty sensors, leaking fpr, bad tuning/program...).

The fact is that even without a cat you're HC would be lower then that if everything was right. For that matter, dropping a new cat in the exaust will cover up most problems and get you through emissions (but high HC #'s will also ruin a cat pretty fast).

 

Well I dont know what else to say here I do have a new Cat, EX,O2 sen,fuel pressure reg, msd6al ing, progaming, ported heads. Tunning seems to to be right on. air fuel ratio is good dyno pulls shows almost 306 cam power. And I do that through 1 5/8 BBK headers a single 2 3/4 EX.
There are some cams that just will not pass emissions I have one of them.

 

You need to cut your idle timing in half. Say to 14 degrees advance or so. That will help on idle hydrocarbons. Also try and take out a lot of fuel at idle. Really lean it out. Don't run more than the idle and the 2500 rpm test before you reflash the pcm.

If you have an afpr lower the fuel pressure as far as you can.

If all else fails pull out some green and have the tester stick the wand up somebody else's tailpipe.

PK

 

What state do you live in? I know people who've passed emissions with that cam, along with ported/polished heads, and having the computer reprogrammed.

 

I'm not a pro or anything...but one thing I would do, without a doubt...is have TPIS program your ECU, rather than sticking with the junk programing that so many people have fallen victim to from places like Breathless Performance and PCMforless, etc, etc.

TPIS knows what works with their own cams...and they do an excellent job of taking care of their customers and making sure that when they do something, they do it right.

I recommend calling again and speaking with Jim Hall. Set up some programing with them, and it very well may take care of your emmissions problems. They'll do it until it's right...without a doubt.

Good luck!

Eric

 

I have spoken with Jim and he said he did not know if the cam will pass they have not tested the cam to see if it would. TPIS is were I have bought most of my parts for my car. The last time I spoke with him he sugested the heads not the cam. So with that said if I fine someone with this cam that passes. maybe I should look at the heads I have tried a lot of things to make it pass. Besides cheating on the test with methonal or any thing else. Snoochies has said he knows people with the cam that have passed.

 

Okay...sounds good. Jim is a real good friend of mine and I know he knows what he's talking about, that's why I specifically recommended him.

Have you thought about having them do some programming for you? Your heads very well may be the restriction you're encountering, but the program may have it running rich, among a ton of other possibilities.

Again...good luck.

Eric