I'm guessing it's probably different from Toyota vvt-i that was around on the BEAMS motors.

That's exactly what it is, I can see how with small orifices that could be PWM controlled. Fair enough.

Thanks,
Dann

Its probably similar to the VVT on the newer ford duratech motors.

With small orifices slowing the change in angle and good PWM a system similar to how honda works could be used.

Fair call.

Do we know if they are tightening the LSA to get more power towards the top end?

NC is intake cam VVT only?

Dann

I love how the original M.net post added estimated crank horsepower numbers. Just to make it look more impressive.



Also, bumped to third page for some cool pneumatic cam-less valvetrain.

Thread direction change is win.

I found a rare clip of a m.net tuner in action




Brace yourselves for the majestic being you are about to witness














https://www.miataturbo.net/attachmen...ine=1380046083

My car has a retarded tune, but at least my AFRs are above 12. (black bumper is rainbow; exhaust backfires are magic)

And that's what weirded me out the most. My MX6 is "tuned" in probably the worst way imaginable, would make most of you cringe if you saw it in person.

But even my AFRs aren't that bad.

My favorite part was the guy saying the extra fuel was to keep the cat cool. Because we all know throwing gasoline at a hot object is the best way to cool it.

HOLY SHIT you just inspired to invent a new thing.


E-Cool Exhaust Injector
"Keep Your Cats Cool with the E-Cool Exhaust Injector!"

^

1. inject exhaust into your engine with DEI.
2. inject fuel into your exhaust with EEI.
3. ???
4. Profit.

:bowrofl:

I just sprayed my monitor with Diet Pepsi. What kind of injection is that?

that would be aspartame injection.

I could have sworn you throw in extra fuel to HEAT the cat. This is why cars are rich during warmup: So the cat gets to temp faster and starts working on cutting emissions sooner.

Really? Apart from the obvious choke thing?

Are cars exempt from testing in my places for a certain time period after cold start?

Dann

no place will test a cold car ever.
has to be completely up to operating temps and most will have you idle it for like 10 minutes before even putting it on the rollers/sniffer

That's probably why the emissions lines are always so damn long. I can't imagine a car not being to temp by the time it makes it to the front, unless the driver is turning it off.

So why is brain mentioning extra fuel on cold start for the cat, is he being facetious?

Dann

huh?
No, he is on point: all oem cars are tuned to run relatively rich on startup to heat up the cats faster. Many newer cars even have a "smog pump" which is basically an air pump that blows into the exhaust stream or heads resulting in more crap flowing through the cats on a cold start and heating them up faster.