Re: divided exhaust housing flapper valve.. quick spool down low, big power up top?
 

I have a hardon for removing them.

Re: divided exhaust housing flapper valve.. quick spool down low, big power up top?
 

First off, Toyota's exhaust valve is in the DOWNPIPE, not the manifold. How about YOU take a look. I've seen it in person, took pics, and viewed illistrations made by Toyota. Did you ever think WHY their setup doesn't work? Two shitty turbos? Small diameter, short-radius DP? A manifold that flows like a log? Its not the theory that's crap, its their execution of it - OEM quality or not.


Lets forget about Toyota, and just review some known facts and draw obvious conclusions:

1) People are making >400whp with a .63ar undivided T3 housing on their B18's.
2) Turbos make more power with a larger turbine housing based on A/R number.
3) Turbos spool faster with a smaller turbine housing based on A/R number.

Slap a divided .78ar housing with this valve added onto that 400whp setup. Valve closed, it works like #3. Valve open, it works like #2. Can you EXPLAIN how this wouldn't work? Calling me a fucktard isn's good enough. What I find odd, given the ---- your flinging, how there ARE examples of this working. The guy with the Maxima, who's brother is redzcstdhatch, picked up around >1000RPM with his homemade quick spool valve (more like 1.5-2k IIRC). In Aero's example, 10psi by 2600rpm on a 2.4L with a 68 lb/min turbo, using the variable 2~25cm housing. His Holset HE351VE only changes the gap before the turbine, not the volume of the housing, and it still helps spool in a rediculous way. A stock STi can't even spool that fast, despite more displacement and a turbo half the size.


Maybe these quick-spool people are straight-up lying to us, and making fake datalogs in Aero's case. Or maybe you're wrong for once, JD.

Re: divided exhaust housing flapper valve.. quick spool down low, big power up t
 

Maybe I'm reading wrong into what JD is saying, but from his posts, it looks more like he is saying: "Use the Toyota one, they throw them away (I.E they are free or close to it), they are oem quality why reinvent the wheel?"

So he is calling you a fucktard because he is not arguing with you, but showing you an easier way.


OR....


Maybe I'm reading it wrong... :1

Re: divided exhaust housing flapper valve.. quick spool down low, big power up top?
 

Crap, maybe I'm reading it wrong instead. :1 Sorry JD if that's what you were getting at. I thought you meant "they throw them away", and I should forget about the idea.

But the fact remains Toyota designed it for 2 turbos, it's integrated into a cast-iron downpipe elbow, and stops flow - not divert it.


I want to divert flow on a DIVIDED manifold, and then return it to fully-divided. That can't be done with Toyota's bullshit. The supra manifold is actually like 2 logs connected by a 1.75" flexpipe, not fully divided.

Re: divided exhaust housing flapper valve.. quick spool down low, big power up top?
 

i dont really think returning it to a divided manifold setup would be more efficient. closing off the larger side to help spool down low and then just opening the entire thing seems to make more sense.

my theory is that a divided manifold causes 2 runners of the manifold (the smaller side of the turbine) to build more pressure because they are trying to force the same amount of gas as the other two through a less flowing area. yes this is good for spool, but with the valve you force all 4 runners to flow through the smaller area, increase spool, then open the valve (not causing the manifold to return to a fully divided setup). this equalizes the pressure in all four runners and should now allow more gas to travel out the larger side because its being fed by partially all 4 runners. yes some gas would still escape through the smaller one but you wouldnt want to block it off.

maybe could gain more low end spool and reach max boost faster.

OK, I'm bringing this post back from the dead :).

Unless this company sat on this idea for a while, I have enough documentation to kill their patent. And, I have documentation from at least one year before that... The below listed quote is from January 2007.

Source: Faster spool and more boost

I sold my 2.3t car before trying it :(.

If the flange and shaft are made from the same material, then the CTE will be the same. Therefore, a small clearance can be machined into the shaft and it shouldn't change with temperature.

Anyways, there are plenty of examples of people doing this and I highly doubt that patent is enforceable.

Have a good day!
Michael

so u noticed a big increase