Mod Plate and Engineers Certificate

[GTSBoy]

20 minutes ago, Ben C34 said:

Has to oscillate around stoichiometry

Yeah, well, obviously that's only at lowish loads, because we're not going to run anywhere leaner than about 12.5:1 with decent boosts on board. And you'd have to be somewhat of a numpty to not set up closed loop cruise and idle. Wouldn't you?

[Ben C34]

On 2/22/2023 at 2:20 PM, GTSBoy said:

Yeah, well, obviously that's only at lowish loads, because we're not going to run anywhere leaner than about 12.5:1 with decent boosts on board. And you'd have to be somewhat of a numpty to not set up closed loop cruise and idle. Wouldn't you?

Plenty of numpties around.

 

People just seem to think a cat is magic.

Not sure what emissions test you are thinking of where you would be running decent boost?

[MrRx7s3]

11 hours ago, Vee37 said:

I once hinted that a supercharged engine would probably fail (because of emissions) and man did i get burnt by an angry member.

PS: you may wish to edit your post and remove all the carriage returns. I had to take it out of the above quote.

Sorry man didn't notice, how do I edit my post? can't find it anywhere, I only have the option to Report or Share.

[GTSBoy]

You can't edit your posts after a couple of hours. This to prevent a brand of shenanigans that we used to have trouble with.

Just report it and ask an admin to do what you want done.

[Vee37]

1 hour ago, MrRx7s3 said:

Sorry man didn't notice, how do I edit my post? can't find it anywhere, I only have the option to Report or Share.

My bad, I'm used to other forum software which lets you edit posts after people have quoted you / responded. I cant edit my posts here either. Its probably too late to bother now, things have moved on, but if it was more serious, reporting your own post to a moderator asking for an adjustment has worked for me.

[Kinkstaah]

I passed an emissions test in NSW (for Victoria!) doing the IM240 with a cammed LS.

Keep the stock cam when you go there. I had four cats, 2x100 and 2x400cell. They do not seem to impact performance at all. Given how the IM240 is actually done, I see no reason why you would not pass it due to the addition of a supercharger because ALL of the tune is outside any real load cell area. They would barely use 20% throttle in any of it. It is a sample generated in the 1960's of a 4 minute (hence 240) cycle of stop, go, drive around town experience with one pull onto a medium speed highway from like 60-80kmh.

The events are timed, so they cannot say, floor your car from 0-80kmh, the actual acceleration gradient, gear change times, and what gear you are even in are controlled.

In my case I was allowed into the lab/dyno area to directly work with the guys to pass the car, even tune it on the spot. This depends a lot on your charisma and people skills I suspect. The biggest kicker for me was actually idling, and the car produced much more pollutants idling than it did moving. A lot of the test is idle.

Hence a big choppy cam with raw fuel going out the exhaust is _not_ optimal but I barely scraped through. Having a 2003 car you will have more stringent targets to hit than I did, as I was in the 98-2002 bracket.