RonA

iTrader: (1)

Just curious if there has been any new testing done with the quick spool valves. I've seen some newer designs that use better materials(Inconel), and have been considering trying one on a divided T6 instead of twin S362's.
Looks like one side of a T6 flange flows about 70% of what both sides of a T4 flows, so as long as the flange opens by 5-7psi, the drive pressure shouldn't get too far out of hand.

dezlfrek

iTrader: (1)

in for info..

rkreigh

very interested. I saw a feature on a ralley car where they were using a dedicated injector to "fuel" the turbo to help spooling off corners

I'm sure this would eat a catalytic converter alive with how rich the burn would be but it sure was interesting.

sorry I don't know anything about the spool valve.

I was reading a bit on the divided housing turbines and generally on a big v8 they weren't advised as they would restrict the exhaust flow just a bit

not a big difference, but this authors opine was that the divided housing turbines worked better in a 4 cyl due to scavenging advantages of keeping the cylinders separated

interesting stuff! boostamuv

RonA

iTrader: (1)

Kind of reminds me of the diesel days Adam. I remember when I'd ask p-pump conversion questions and the silence was deafening. :-)

chuntington101

It's not quite as simple as that. All top flight WRC cars have used a similar system to Subarus Rocket Box for some time. This system bypass air from the compressor to a combustion chamber (a bit like the guys use that turn turbos into jet engines) and then back to the turbine. By controlling he amount of air bypassing the engine and the volume of fuel they inject they can basically have whatever turbo shaft speed they want regardless of engine rpm! You want full boost at idle rpm? No problems. You want to maintain boost during a shift no problems.

Also another advantage is this type of anti-lag is much kinder to the turbo the conventional bang bang style anti lag were you simply keep retarding timing to hold the engine at a set rpm.

As for the cat, rally cars have to run them but tend to mount the right at the end of the exhaust. They still get pretty hot and can often be seen glowing red hot. Also it worth noting just how hot the exhaust on these cars can get. One Ford Focus WRC car came I the pits with a damaged exhaust. The Ford mechanic grabbed the exhaust to pull it off and it was that hot it set his nomes glove on fire! Ford used to have their manifolds specially made with super clean welds to prevent blowing turbos. Inconnel is the material of choice for manifolds as it withstands the heat better than stainless. Rest of the exhaust is usually titanium to save weight and stainless steel on really bad stages as it's stronger. Pretty interesting stuff!

dezlfrek

iTrader: (1)

ya Ron.. crickets.. I am guessing yb would be a better place to get some answers but I doubt most of these guys even know what it is..

RonA

iTrader: (1)

Probably best if I just don't even try it Adam. There's progress being made on mine now. Should have the long block built before the end of the year. Then the dry sump and turbo plumbing will take another couple of months. Still hoping to be ready by June.

Sarg

iTrader: (6)

From the testing I have seen it does help the low end and will mimick the gains that a true twinscroll set up will give you if you have merged your pipes before the turbo instead of keeping them divided for each bank. The supra guys have been using these for years with decent results.

Forcefed86

iTrader: (4)

In for info…

The cost per gain ratio was always what irked me about them. Of course they work, but is it worth the ridiculous $560 price tag? Spooling down low doesn’t seem to be an issue for most with LS motors, if the turbo/converter are right anyway.

Sarg

iTrader: (6)

Probably just allows a little bigger turbo with the same spool characteristics as a slightly smaller one...same as twinscroll really.

Forcefed86

iTrader: (4)

Sounds performance has a few good dyno comparisons of the gains on Supras with large TS housing turbos. It’s pretty impressive.