Well im debating my plan for my GTA and im working the idea of putting my 406 in her. HOWEVER, I need to know more about Emissions. Will a HSR hurt my quality over the TPI?

I can get a no inspection sniffer where I live so as long as the tail pipe is good, im good. Also does having a true dual change anything? Being only 4 cylinders instead of 8? I was told that in the past but it seemed like one of those "paint your valve covers and gain 5 hp" kind of things.

Emission Gurus...HELP!

 

I've seen cars pass the sniffer without a catalytic converter, let alone without an EGR valve. Yes, depending on the state of tune, you will pass the sniffer, but you will not pass the visual. I know what you stated above about the no inspection sniffer, but I needed to mention the visual regardless....

 

From a purely legal standpoint, no you can't pass emissions with the HSR as it lacks EGR compatibility to meet Federal law.

However, depending on your state inspection requirements you could (depending on cam etc) tune the HSR to pass the sniffer portion of the test. If they don't require a visual for all factory emissions equipment, then a clean sniffer would get you through.

 

Well i dont think your doomed just because your useing a stealth ram. Becides there are many other factors that will determin this to even guess. Ive had cars that passed with no emmissions controls what so ever with a bit of emmissions tuneing. However the dual exhaust thing wont help or hurt. Emmissions are measured in PPM (parts per million) So reguardless of the amount of exhaust gasses tested the the ratio will be the same. So emmissions tests are in a sence measureing how efficiently your burning the fuel not neccessary how many harmful emmissions particls you emmit.

 

but if you get a 50- state legal cam wouldnt that help the hsr to pass emissions?

 

Depending on the state, passing the sniffer test is only part of the inspection. Some states also perform a visual inspection to verify the presence of all the emissions equipment the vehicle left the factory with. So even if you blow clean, the car may fail if there is not an EGR valve or AIR system on it. This varies by state and sometimes by inspection station within a state.

Remember, it is a violation of Federal Law to remove any of the emissions equipment even if the car doesn't need it to pass the part per million test on the sniffer.

 

well doesnt the HSR make a baseplate for the EGR valve? PA shouldnt be too bad but does anybody know how strict they are?

 

No. HSR does not have any options for an EGR. Someone with good fab skills might be able to make one but it is not available from Holley.

 

ok i got it

 

The guys over at TPIS make an egr base plate to weld onto their miniram. So you could probably get the base from them and add it to your egr.

 

True. You could also look at the vacuum activated EGR valves from the early carb cars and attempt to get one of those to work with it. But getting it to pass would all depend on local inspection requirements. It might work in one place but not be legal in others. Example: it would not be legal in CA where the part requires an EO number to make it legal.

 

on the HSR there is no exhaust crossover built into the manifold. you would have to do some serious fabbing to make one and get the EGR to work. now, you could 'fake' it by placing it on the manifold to look like it works.

 

The TPIS setup connects directly into the Miniram plenum through one of the vacuum ports. If you were very careful with the cleanup, it should be possible to tap the 2 holes required to install it into the side of the Stealthram plenum and use this kit. It would also require you to tap the AIR tube on the #8 cylinder to pass exhaust gas into the EGR and, if the car is a MAF car, you will need to fabricate a spot in the exhaust gas tube to mount the EGR temp sensor. This should work as well on the HSR as it does on the Miniram. It just won't might not be that pleasing to the eye to have it hung from the side of the intake like that.

 

I will be doing this operation probably over the year end holiday, and will post pics.

Bill

 

That is pretty extreme Bill, no....?

Seriously though, you don't need to do that, nor ruin a good intake manifold. What I did a few years back, was made an adapter plate that acted like a spacer that sandwiched between the throttle body, and the plenum's orifice (similar to that of a nitrous plate). The spacer was drilled and tapped on the passenger side to accept an EGR tube similar to that found on the 3.1 V6. It worked fine, looked factory, and I didn't need to ruin a perfectly good intake manifold. There is also work needed to be done on the exhaust manifold, nothing major though...

 

I don't see it as extreme at all, with (minor) engineering skills and intermediate fabrication skills it is very do-able, easy even. As far as ruining a manifold, nah. It will be an improvement to an almost-perfect manifold. Since when does retaining functional, effective emissions equipment while increasing performance "ruin" a part.....

Bill