Thoughts on Twinscroll Turbo's??

livestrong14 · Post by **livestrong14** » Sat Nov 24, 2007 2:26 am

What do you all think of them? I am looking at getting a GT32r rotated mount twinscroll in the future.... anybody care to share their opinions?

Arctic Assassian · Post by **Arctic Assassian** » Sat Nov 24, 2007 2:46 am

Its sooo much fab work. I cant remember, do our oil pans clear the twinscroll setup? I think it has the "dent". It would be cool, But I dont see the point in all the extra effort for a few hundred more rpms in boost...unless youre draggin it.

555BCTurbo · Post by **555BCTurbo** » Sat Nov 24, 2007 9:05 pm

Our oilpans do not clear the factory Subaru twinscroll setup...

Honestly Devan, you would have to get a header custom fabbed...and after assisting in building a stainless twin scroll header and seeing all the work that goes into it...it's just not worth it...

And...a GT32 isn't really big enough to really need a twinscroll setup...so just look at getting one without the divided hotside

92ss satinsvoice · Post by **92ss satinsvoice** » Sat Nov 24, 2007 9:39 pm

i have two that im thinkin of. . ether the parrin gt35r or gp-moto gt32r kit.

one has internal waste gate and the other is external. one kicks in around 4k and the other is almost below 3k. eh, sucks makeing choices like this.

Boostedballs · Post by **Boostedballs** » Sun Feb 17, 2008 12:06 am

The twin scroll will only give you something over a standard housing if you isolate the left bank primary header tubes into one opening of the turbine housing and the right bank into the other. Otherwise, you defeat the purpose of the twin scroll. This is not any easy task with the uppipes the way they are on our subies. If you run the twin scroll without this, it will just act as a regular turbo. At least knife-edge the divider if you go that route.

OR- You could make a larger diameter uppipe and slice it down the center and weld it back together with a divider inside that runs the length of the pipe. This will have to match up to the collector and to the turbine inlet.

sounds like a pain in the arse...

PS: the turbo boost range is not a direct calculation of engine RPM. The same turbo will make boost at different RPM's on a different engine. Engine load and cam selection are key factors in the boost range of any turbo setup.

Arctic Assassian · Post by **Arctic Assassian** » Sun Feb 17, 2008 2:02 am

I believe I said a few hundred rpms more IN boost. not psi of boost. Read correctly, fool.

Boostedballs · Post by **Boostedballs** » Sun Feb 17, 2008 2:24 am

Arctic Assassian wrote:I believe I said a few hundred rpms more IN boost. not psi of boost. Read correctly, fool.

Are you calling me a fool? I didn't think so.

Anyway, I was responding to this quote:
"one has internal waste gate and the other is external. one kicks in around 4k and the other is almost below 3k. eh, sucks makeing choices like this."

92ss satinsvoice · Post by **92ss satinsvoice** » Sun Feb 17, 2008 10:43 am

well i just go beat by a honda. so im not going to throw this money into my car. its a waste.

555BCTurbo · Post by **555BCTurbo** » Sun Feb 17, 2008 7:02 pm

92ss satinsvoice wrote:well i just go beat by a honda. so im not going to throw this money into my car. its a waste.

There are a lot of fast Hondas out there...

i_c_the_light · Post by **i_c_the_light** » Mon Feb 18, 2008 4:52 am

92ss satinsvoice wrote:well i just go beat by a honda. so im not going to throw this money into my car. its a waste.

That's pretty sad if you ask me.

smh0101 · Post by **smh0101** » Mon Feb 18, 2008 7:32 am

555BCTurbo wrote:
92ss satinsvoice wrote:well i just go beat by a honda. so im not going to throw this money into my car. its a waste.

There are a lot of fast Hondas out there...

And even faster subarus! haha!!

But andy, dont give up... ask david for some "help"

And I believe I explained all this to you earlier... different markets, grocery getter base, vs. rice rockets...

93forestpearl · Post by **93forestpearl** » Mon Feb 25, 2008 5:46 pm

The cylinders are supposed to be paired back two, front two. If your manifold isn't equall length, you are negating the purpose of going twin scroll.

An easy way to do it is get a header that pairs the proper cylinders and keeps them split untill right before hte turbo. Then you can chop it off right before the turbo and make it a tru twin scroll.

Kind of like this

smh0101 · Post by **smh0101** » Mon Feb 25, 2008 5:48 pm

Whoa... thats pretty cool... twist-ed

93forestpearl · Post by **93forestpearl** » Mon Feb 25, 2008 7:28 pm

Ya tis my buddies setup, twin scroll GT3076R. Its been shelved for experimentation with GT3782 VNT from a '06 powerstroke. Can you say launching on 20psi with an auto

But anyways, he just used a $250 "split pulse equal length" or whatever the hell they sell them as on ebay. Chopped the subaru flange off and had at it. It worked really well too. Hard to argue with about $300 total investment into the manifold/uppipe setup.

93Leg-c · Post by **93Leg-c** » Thu Feb 28, 2008 6:43 am

555BCTurbo wrote:
92ss satinsvoice wrote:well i just go beat by a honda. so im not going to throw this money into my car. its a waste.

There are a lot of fast Hondas out there...

There's a guy a few miles from me that has an 11-second Honda.

93Leg-c · Post by **93Leg-c** » Thu Feb 28, 2008 6:46 am

Hmmm, I was thinking of going twin-scroll. But from what you guys are describing, it seems like I'll be shelving that idea.

Last week I drove a Legacy GT with a twin scroll. Wow! Gobs of power! VERY driveable in city streets. Has about 325 awhp and about 350 awtq.

92ss satinsvoice · Post by **92ss satinsvoice** » Fri Feb 29, 2008 5:05 am

ya i know theres a lot of fast honda's. i was just pissed because it was a b20 crv motor stock. with 140hp. im like wtf....

but then again i realised that his car was gutted and i still had my full interior plus about 180 pounds of tools in the back.

smh0101 · Post by **smh0101** » Fri Feb 29, 2008 5:10 am

Well, back to the OP

What are your plans now Devan?

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Thoughts on Twinscroll Turbo's??

Thoughts on Twinscroll Turbo's??