shweet what's it called?
Polly, while we are on the subject of emissions.
I noticed that injecting water into the inlet air can reduce emissions significantly. My initial testing cut CO and HC emissions by almost 15%! My setup wasn't even anything special, 200cc injector with a 3.7bar boat-freshwater-pump (40$ ebay).
Maybe you should look into water injection soon? It would help you clean the combustion chamber, along with running higher boost pressures more safely.
Just throwing it out there
Reading something else about the VW diesel issues, and Porsche in the past have used a small air compressor which injected air into the exhaust to lower the emissions.... Clever idea
I thought that too, but this was injecting air in (at a pressure higher than the exhaust gas i guess), so should do more than a hole which would just leak exhaust gases and be a MOT fail.
aye may have to consider that on my todo list, read of ppl using expresso machine pumps with a fine nozzles for more reliable better mist.
where did you mount urs without fouling the MAF, perhaps in the inlet mani next to all the brake servo/carbon canister vacuum ports? and running constantly?
basically diluting the mixture like a fruit juice or watering down pub drinks. adding more volume of air to exhaust so even though more gas volume is chucking out the pipe past the reader, the % of CO/HC per volume is measured as less...
Ooooh you've given me an idea Matt, lets just plumb an air compressor into the exhaust, simples lol
That was allowed though. There were other carbureted cars that used the same principle. They needed more o2 before the cat to get them to work more efficiently. Dont need it now with fuel injection and ECU control.Reading something else about the VW diesel issues, and Porsche in the past have used a small air compressor which injected air into the exhaust to lower the emissions.... Clever idea
You running a megasquirt??I run MAP, so I don't have to worry about fouling a MAF. But I inject water a 20cm before the throttlebody. There are many suitable places to inject it, like pre-turbo, manifold runners etc., all different ones have their pros/cons. I chose the pre-TB because I'm only running a single injector, and want a simple & reliable setup.
For MOT, I have a tune that trigger the water injection when the RPMs rise above 2000rpm. It then shuts it off when the RPMs fall below 1900rpm. Simplicity itself. For normal road running, I trigger the water to activate at 1200mbar manifold pressure, and stay on until manifold pressure falls below 1000mbar. I really like my ECU's ability to program general outputs )
This one will not net as much as water injection. IIRC, you can only dilute the exhaust gas up to 5% 02 (might differ in your country). The MOT tester must manually adjust the 02 reference, when an air-injection system is used. This is because the sniffer must still check if lambda is within 0.97-1.03, something that would be greatly affected by an air-injection system. The 300ZX and 200SX all uses air-injection on the early 90's models. My ECU even has a air-injection output, not that i'm planning to take it into use Water/Methanol will do just fine for me
Nah mate, Nismotronic, specifically designed for 90's Nissans. There's a link in my signature to my thread (shameless plug)
Back on topic, do you have last years smog result Polly?
So I just looked it those 2012 readings. I'm sure you know what they mean. It looks like over fueling with an air leak somewhere before the o2 sensor. So there's a few things to check there then. Poor ignition or timing, air leak, or too much fuel. The trouble is, the high hc reading will damage the cat eventually. An air leak before the o2 sensor will exacerbate any problems by causing over fueling as well.
Hope it passes without too much hassle for you Paul.
...so I guess the secondary cat is pretty useless down there.
Congratulations on the pass!
Regarding the cat, I think you are underestimating them. Most vehicles run single cat, and pretty far away from the engine too. I think your high emissions could come from injectors or piston rings?
Here's a link to my most recent smog, SR20VE, single cat far away, very small and balanced injectors http://i.imgur.com/vbemBpk.jpg Should produce much more emissions than a CG-engine, yes?