buying a twin scroll set up

[wrex03]

I think I'm going to go a different route than the SR50 and AVO turbos.

I done some searching on the internet and came up with almost nothing about what turbos are available for subarus with a twin scroll set-up.

Vf36, vf37 and pe1825 are all twin scroll, but which one will get me to a goal of 350-375 wheel horsepower with the least lag.

I realize I need all new header up-pipe and down, but will the twin scroll down pipe mate up to a stock sti axle back.

Please add as much info as possible.

Dave

* Registered users of the site do not see these ads.

[wrex03]

Anyone

[hatchy]

I don't know the answer, but does twin scroll really make that much of a difference?

[dwx]

The VF36 and VF37 are too small to get you there. The PE1825F would easily put you in that range (it's rated for about 450hp on the 2L), but it's going to cost ~$2500. (List on PE's site is ~2200). Likely for the whole setup you are looking at almost $4000, if you can find the exhaust pieces used for cheap enough. Rallispec I believe will sell the setup for $3800 w/VF37 or around $5000+ with the PE1825F. Your catback will mate up with the JDM turboback.

What WHP you get depends on what dyno you are using. 350-375whp is alot. You are talking 100-125whp more than the stock car.

Some have said the twin-scroll makes a big difference but the price premium to convert to that setup is likely not going to be worth it. You could convert to a Garrett setup for that kind of money and buy a HKS turbo that would probaby outperform any twin-scroll currently available.

[bikerboy]

Originally posted by wrex03
I think I'm going to go a different route than the SR50 and AVO turbos.

I done some searching on the internet and came up with almost nothing about what turbos are available for subarus with a twin scroll set-up.

Vf36, vf37 and pe1825 are all twin scroll, but which one will get me to a goal of 350-375 wheel horsepower with the least lag.

I realize I need all new header up-pipe and down, but will the twin scroll down pipe mate up to a stock sti axle back.

Please add as much info as possible.

Dave

why not avo or sr?

dp and cat back has to be jdm

You are going the wrong way here! the VF series turbo's are maxed at 350 crank HP. If you want 350 to the wheels you need an aditional 135 hp +- to get there. You will not do that with a VF and twin scroll.

Matt

[wrex03]

What are comparable turbos for the 37/36? And are their any bigger twin scrolls than the ones I've listed? Also what would a 37/36 produce on a fully set up car?

You could convert to a Garrett setup for that kind of money and buy a HKS turbo that would probaby outperform any twin-scroll currently available

As for the HKS set up what does the 2540 compare to?

why not avo or sr?

Just want to do something a little different than everyone else.

Thanks,
Dave

[dwx]

User dug-e-fresh on the board ran some fairly amazing times on a stock V8 JDM motor with the twin-scroll turbo and that is what has people thinking about it. With that setup, a Utec, and catless exhaust he ran a 12.0x@115mph, running about 17.5psi on the turbo. He dyno'd at around 320whp on TXS dyno with the setup.


edit:

The 2540 on a 2.5L would probably put you close to what you want, but you'd have to run race gas and alot of boost. I'd look at something with the 2835R, which would probably easily get you to your goal. However it would require custom piping and whatnot, but I think Dan@Godspeed could supply that. But the AVO/SR turbos are already Garrett hybrid turbos and bolt right up.

The only twin-scroll turbos that exist period are the ones you lists. VF36/37 and the PE1825F.

Phil

[wrex03]

User dug-e-fresh on the board ran some fairly amazing times on a stock V8 JDM motor with the twin-scroll turbo and that is what has people thinking about it. With that setup, a Utec, and catless exhaust he ran a 12.0x@115mph, running about 17.5psi on the turbo. He dyno'd at around 320whp on TXS dyno with the setup

That is what got me thinking that direction, plus it's supposed to have better spool and again it would be different than other peoples set-up.

I've also thought of the ultimate racing turbo, but it's a little to pricy. I'm willing to spend $4.5k to reach my goal which should be more than enough.

Edit:

When would full boost be reached on a 2540 compared to a 2835R

[StevieD]

Originally posted by wrex03
That is what got me thinking that direction, plus it's supposed to have better spool and again it would be different than other peoples set-up.

I've also thought of the ultimate racing turbo, but it's a little to pricy. I'm willing to spend $4.5k to reach my goal which should be more than enough.

Edit:

When would full boost be reached on a 2540 compared to a 2835R

Dug is selling his twinscroll setup over in the forsales some where....

[calworld]

I know Zerosports(www.zerosports.co.jp) has a twin-scroll turbo also, but I don't know the spec for it. They are retail selling for 2300 dollars...I guess if HP/$ ratio is correct, it should give you what you are looking for. But you need to change not just the DP/UP, but you need to change your header as well. So it probably will cost $$$

[wrex03]

I wonder what the shipping charges would be...

[totoherbs]

http://forums.nasioc.com/forums/show...ht=twin+scroll

http://forums.nasioc.com/forums/show...ht=twin+scroll

http://forums.nasioc.com/forums/show...ht=twin+scroll

Turbo $3,192.18
Up pipe $410.32
Ex manifold $1,651.88
Sump $120.92
oil pickup $24.19
gasket $7.49
gasket $12.14
gasket $7.94

+ freight

Searching = good
Good luck... Its just not cost effictive, and the 2.5 block might be to much flow for the twin scroll vf. They arnt that big, a vf22 is still the biggest.

[wgknestrick]

I am just curious, but why would you want to do this? My point is: why spend so much extra money in the rare/custom pipes just to have a twin scroll? If you are going to spend the money to do this....just buy a Garret turbo (a real one, not one of the cartridged hybrids) with a separate wastegate in a custom uppipe. Granted, the twin scroll VFs are probably the best turbos in the VF series, but that is where it stops. Don't think that there isn't better snake oil out there for the money you are talking.

I'm not positive on this, but I think Dug went the way he did, because it came with his engine, and he did wonderful things with his setup.

$4K would definately buy you a custom down pipe, uppipe, GT30 turbo, Tial wastegate, new MAF tube/eliminater, PE 800cc injectors. You would have a shot at 120+ traps with this.

[totoherbs]

The twin scroll vf36/37 are not big turbos they wont hold 20 psi at redline on a 2.0L.

[nmyeti]

Wait till you see what we do with Doug’s twin scroll setup next!

It's going to be wicked.

You guys need to remember that IHI isn't the only company to offer a twin scroll setup. I have no desire to play around with ANY of the IHI based twin scroll units. Doug’s car will see low 11s when I am finished with it, and I’ll bet it will manage an 11.8 or better on PUMP gas.

-Nathan

[totoherbs]

PE? Mitsu makes them the new lancer uses a 16G right??

[nmyeti]

PE is still IHI based, Mitsubishi does do some smaller Twin scroll units, but Doug is going to go much larger.

There are some small A/R twin scroll T4 setups that we are going to try out. Basically you build an up-pipe adaptor off of the stock twin scroll header. Add an external waste-gate pulling from both sides of the up-pipe and you’ve got a very nice setup that will incorporate the benefits of a twin scroll turbo on something with enough compressor wheel to get us into the low 11/high 10s.

-Nathan

[wrex03]

There are some small A/R twin scroll T4 setups that we are going to try out. Basically you build an up-pipe adaptor off of the stock twin scroll header. Add an external waste-gate pulling from both sides of the up-pipe and you’ve got a very nice setup that will incorporate the benefits of a twin scroll turbo on something with enough compressor wheel to get us into the low 11/high 10s

What's the cost of the custom up and turbo's. This is the way I'm planning on going once the utec comes out.

[totoherbs]

There is another thread on this...
http://forums.nasioc.com/forums/show...54#post5220254

Originally posted by wrex03
What's the cost of the custom up and turbo's. This is the way I'm planning on going once the utec comes out.

Not cheep, and depending on how much they charge you to get your pipes made... it could get bad. Just look at the list I posted and then add $$$. Its just not cost effictive, I wouldnt do it unless you already had a ver8 motor..... The only twin that might be usefull on the 2.5 is the garrett( I dont know how big the garrett is), the others are way to small...

[Mach5WRX]

Has anyone tried a VF37 on a USDM STi 2.5L. Sometimes things don't look like they would work well.....but when you try it in real life it does ok.

[Dynamispeed]

I have one from GP MOTO. It will be available soon

GT32 twin scroll kit

Regards,
Ashley

[duncangrant]

Originally posted by nmyeti
There are some small A/R twin scroll T4 setups that we are going to try out. Basically you build an up-pipe adaptor off of the stock twin scroll header. Add an external waste-gate pulling from both sides of the up-pipe and you’ve got a very nice setup that will incorporate the benefits of a twin scroll turbo on something with enough compressor wheel to get us into the low 11/high 10s.

-Nathan

Just one wastegate? I thought you would need two, or do you get dual-entry wastegates?

Duncan

[XT6Wagon]

duncangrant, you either accept that the wastegate pipe will allow crossover between the two pipes, or you go to some length to insure that the 2-1 join for the wastegate is actualy AT the wastegate flange.

You however might be able to get proper operation by wastegating only ONE of the pipes... but just don't ask me why you would want to run the risk because it MIGHT work for your setup. Also basicly this only works when you are nearly maxing out that turbo anyway.... so this is flat stupid for a turbo of any real size

[totoherbs]

Originally posted by Mach5WRX
Has anyone tried a VF37 on a USDM STi 2.5L. Sometimes things don't look like they would work well.....but when you try it in real life it does ok.

Too small... way too small. At 8k on a 2.0 it wont hold good boost... so on a 2.5 it would be dead by 4k.

[Mach5WRX]

Originally posted by totoherbs
Too small... way too small. At 8k on a 2.0 it wont hold good boost... so on a 2.5 it would be dead by 4k.

I don't understand?

1) You say the VF37 will not "hold good boost" at 8k, but what's good boost? 15 PSI, 8 PSI??? Plus my car doesn't rev to 8k anyway....I only need it to make boost till around 6750RPM.

2) How will the VF37 "be dead by 4k"??? What causes that?


Anyone really know how much smaller the VF37 is compared to the VF39?

I ask this because I'm not looking for a big turbo, I don't need big HP #'s I'm looking at this VF37 set up for "fast spool up" and maybe a little more HP.