Is AMS looking into offering a GT35 twinscroll set-up?

 

I bet everyone is waiting to see some results from the twin scroll set up. I'm sure if they are successful, they'll all be offering TS set ups.

 

IMO, there is no need for AMS to produce one. Our turbo kits have proven time and time again to be super efficient and make all the HP you need.

The added complexity and expense (two waste gates) of the kit to gain a slightly better spool is just not worth it. To gain spool, you are going to choke off efficiency on the big end holding back peak HP. This is the same as if you put a smaller AR turbine housing on the car.

I dont understand why everybody is so hung up on spool. Nobody is out there STUCK in 4th gear on the highway WAITING AND WAITING for their turbo to spool. You drop it down a gear or two and you are spooling nearly instantly.

I wouldnt trade top end efficiency for spool EVER!

 

I agree, it's funny to read posts/threads in here about how this turbo or that turbo spools this many RPM's later than stock. Like you said drop a few gears and hammer the the throttle and spool will be in the back of your mind.

 

I think the reason why spool is important is extends the usable power band of the engine. Instead of having 3500 rpm to play with, u might have 4 or 5k with reduces spool.

.02

 

You don't NEED two wastegates, its more optimal but people have gotten by creating a simple divider pre-wastgate to keep the pulses as seperated as possible.

You lose very little if nothing up-top supposedly, and the increase in response is supposed to be incredible.

Scorke

 

This may not be the case though. Putting a quick spooling turbo or turbo kit on the car will get you LOW rpm power and limit UPPER rpm power. You are MOVING the power band not extending it.

Why would you want your car to accelerate hardest at 3000 rpms and not 6000 rpms?????????????

Last question. How often do you actually use ALL of your "power band"? First gear lasts a second maybe??? After that you are at 5000 to 7500 plus rpms for every other gear.

 

I hear you Ivan, but if you could have the same or maybe~10whp less up top, whilst having the turbo come on sooner and harder wouldn't you want that if cost wasn't an issue?

Scorke

 

 

I made the statement of two waste gates based on the pictures of the turbo kit all the talk is about. My 240sx has a GT42-R on it and has a twin scroll. We run a single WG on it pulling off of each side of the collector. Even with one WG, its still more complicated.

Here are some issues I see with twin scroll kits and turbos.

A 4 into 1 header is going to be much more forgiving than a 4 into 2 twin scroll. If your runner lengths are off, you will have two exhaust pulses trying to get through half the collector size and half the turbine size at the same time. This will potentially hurt power production. With the larger collector area of a conventional setup, you have the room for the extra exhaust volume.

The thin area between the scrolls on a twin scroll turbo gets extremely hot and tends to crack. I cant even tell you how many turbine housings I have seen with cracks and chunks missing. A piece of turbine housing going through the turbine will end your turbos life.

Simple is always better. KISS method.

 

How much time do you ACTUALLY spend at 3000 rpms?

I would take the extra 10 HP up top.

 

I have a better solution, stroker motor!

 

Might wanna do some research on twin scroll setups in very high hp applications. There is a reason why almost all high hp setups in high dollar motor sport applications are open volute. The divider in twin scroll turbine housing tend to deflect to one side or another under extreme conditions causing a partial blockage of one of the volutes. This is why Tial has developed their V-band open volute.

I believe I read the article in Racecar Engineering. It was very interesting.

jeff

 

Daily, I spend a good bit between 3-4000 rpms, I'd say thats where most of us spend our time when not driving aggressively or extremely slowly...

The amount of energy that is saved/gained by letting the seperate pulses from the cylinder hit the turbo one/two at a time far outweighs the "restriction" of having the division in the manifold. AFAIK

Scorke

 

We are talking about SPOOLING the turbo and not just cruising around town in vacuum. LOL....