Ok, since I've been told that TPI is virtually worthless, even to minimally low 5000 rpm, I've decided to look into non EGR equipped manifolds such as the Stealth Ram. My question is approxiamately how much will Nitric Oxides (NOx) increase in my exhaust if I remove EGR. Where I live, emissions can be at 150% of stock 1989 standards (89 for my car). Will I be able to pull this off without an EGR solenoid? Also, will my computer throw codes if it is disconnected? I've hit a roadblock here because I've been told there is basically nothing you can do to a TPI unit that will make it flow to and create power at 5200 rpm easily, and I'm obviously not going to be able to use my factory unit on a simple 300 HP 350 and see anything more than 240 HP according to people here. I want to put this motor in my car but it looks like I'm gonna need a ram-port style intake. ****, might as well save up and buy a much more powerful motor

 

A good, working, three-way cat will help reduce NOx emissions without EGR. A cam with extra overlap can do the same thing (ala LT4 "Hot" cam). A three-way cat has platinum/rhodium catalyst to reduce NOx emissions, and a the customary platinum/palladium catalyst behind it, to further oxidize the gasses to reduce CO, HC, and CO˛ emissions. These converters don't require an external air supply, since oxygen is liberated from the nittrogen dioxides in the first phase. If you're still running the standard old OEM monolythic cat converter, a 3-way can help.

 

I've got a question that's been in the back of my mind since I first heard what ELSE the EGR does, and how it's supposed to help.

I've been told (and read) that if you remove the EGR, the engine can ping more at cruise because the EGR helps cool the combustion process?? That REALLY confuses me because you're putting HOT, BURNT, exhaust fumes back into the intake charge. How in Hades does this help cool the combustion process (other that choking the intake charge)??

I was just always under the impression the only reason of the EGR was to re-circulate the exhaust fumes back into the intake charge to try and burn off “unburnt” fuel to reduce emissions. I still don’t understand how it helps cool the combustion process.

Please explain if possible. Thanks.

AJ

 

Who makes a good 3 way cat? Anything that can reduce all emissions well has my attention. Does carsound make one?