Which Twin Scroll Turbo for a 930

[RarlyL8]

We've built a few custom sets of headers to be used with twin scroll turbos, all high HP engines.
I was thinking about building a setup to be used with sup-400WHP CIS engines like most of us have, the benefit being a quick spool combined with a good top end. But which turbo to use? I have heard there are new turbos available that are oil cooled only, no water. Cannot remember who is making them. Are any of these T3 or T4 twin scroll and of appropriate size?

[rodolf]

Hi Brian,

for Twin Turbo application, i will use Garrett GT28RS or GT30 turbo, for maximum power and quick spool.

Water cooling is not a problem, you can use little fan heater like this one :



Twin GT28RS for +500HP, and 2x GT30 for +600HP

But you will have a "modern car", less feeling than single turbo...

You can also use twin K24 turbo, like 993TT, for +500HP, but i don't know if twin turbo are possible with CIS !?

[WERK I]

Hi Brian,
Have you tried calling CompTurbo? They have all types of configurations available; Ceramic BB, Journal Bearing, oil or oil/water cooled, T3/T4, V-Band vs flange, various A/R's, etc.

CompTurbo

[IMONBOOST]

I am a candidate for RarlyL8 headers and TwinScroll on CIS 400 RWHP is exactly my target. subscribed. Mi car is a 3.6 so my turbo might nave to be different.

[RarlyL8]

Thank you for you inputs.
This is a specifc application and the build parameters are set in stone:
> CIS
> Oil only cooling - no water
> 400WHP max at 1.0bar, 6500rpm redline.
> T3 or T4
> Twin Scoll devided housing turbo
Goal is to find the widest powerband twin scroll turbo that will support 400WHP.
I took a look at the CompTurbo website but see no information on sizing for application or any specific range of operation data. May have missed that page.

[WERK I]

I would suggest you give them a call and give them your specifications.

You can also find the twin scroll designs by Garrett. It seems they incorporate twin scroll in their GT37 and higher designs.
Garrett Turbo's

There may be a reason why they use twin scroll on larger turbine frames and not on the smaller GT30 & GT 35 frames.

[IMONBOOST]

I think these babies are Twin Scroll? Are they?

GT-K Turbochargers | www.TurboneticsInc.com - Boosting Since 1978 | turbochargers, intercoolers, wastegates, blow-off valves, controls, boosting systems, turbo kits, forced induction parts & accessories

[911st]

ATP seems to offer twin scroll housing options for the GT35 and large GT3076R. I agree with Dave, it might be worth calling Garret. If they do not offer them direct they might know who is.

I suspect that if you look into the GT3076R which is between the normal GT30's and GT35 you might find it is a good fit.

Also note there is a new forged compressor wheel working its way through Garrett, Turbonetics and some others. Might see if it is available in the GT 30/35's yet.

Examples:

GT35R 0.82 A/R T3 DIVIDED Turbine Housing for GT3582R : atpturbo.com

GT30R 1.06 A/R T3 DIVIDED Turbine Housing for GT3071R/GT3076R/GT3082R : atpturbo.com

Years ago I used to have a Turbonetics catalog. They had a number of twin scroll turbine housings. Might call them to.

[911st]

Brian,

This might be a lead only. Not for the turbo size as a 62mm inducer is probably to big. But I think they may have a unique approach to the center section. Other than that I know nothing about them.

Originally Posted by Frank@AMS

I'd recommend a turbo we call the 850R. It has a 62mm compressor wheel and 62mm turbine wheel with a .68 T4 exhaust housing. This is just a minuscule amount larger than a 35R and has no difference in spool. It also has a billet compressor wheel and the oil cooled center section. This turbo I'm mentioning is built completely built by Precision turbo in house. We have run these on hundreds of turbo kits and can honestly say that they reliably make consistent power.

Sounds like an interesting project.

[smurfbus]

Has anyone tried or heard of master power turbos? Dynamic Turbo : Master Power Turbo
802128-070 could be close to what you're after and cheap. They use those turbos here in drifting with good results but I have no experience with those myself.

[Jerz]

Brian
You are probably thinking about the new line of Borg Warner S-series Extended Tip Technology turbos (like S300SX). They come in both T3 and T4 twin scroll housings, anywhere from 250-850hp. Rice guys are replacing their Garrets with them.
Here is their catalog: http://www.turbodriven.com/files/pdf/BWTS_2011_Catalog_SMALL.pdf

[pdqcarrera]

Originally Posted by RarlyL8

Thank you for you inputs.
This is a specifc application and the build parameters are set in stone:
> CIS
> Oil only cooling - no water
> 400WHP max at 1.0bar, 6500rpm redline.
> T3 or T4
> Twin Scoll devided housing turbo
Goal is to find the widest powerband twin scroll turbo that will support 400WHP.
I took a look at the CompTurbo website but see no information on sizing for application or any specific range of operation data. May have missed that page.

You'll no doubt have several stalkers keeping a close eye on you for this one. Me being one of 'em!

Do the matching headers in 321SS with heater boxes and you'll totally be my hero!

[RarlyL8]

This is an old thread, I'm actually working on this system right now and have a turbo candidate:
Garrett GT3582R-TS
A client did the homework and we shall see how it works out. The headers are my 930 units with split plenum T4 flange and twin waste gates using 38mm TiALs.
Should be a pretty quick spooling setup.

[smurfbus]

I bought a T3 Holset HX40 super for my car and it has twin scroll. It was cheaper than Garrett and has options for turbine housing. I think a HX35 super would be a good match for GT35 family but I'm not sure if that one has twin scroll.

Looking forward for the results for the combo you've chosen.

[copbait73]

Digest the information in this and lets talk. Lots of opportunity when you are considering a special exhaust system at this HP level and engine configuration.

Borg Warner Series ERF Turbos

[RarlyL8]

I never shop price without heavily considering value. Garretts are now made in Mexico so you have to watch quality. Ball bearings are marketing bling and no more than a time bomb as far as I am concerned. I won't touch anything made in China.
This choice was made by the client so we'll see how it goes. To date I have not seen any combo that out performs my headers and a K27S for quick spool and 375WHP. This build has a higher HP requirement so twin scroll may be a necessity to get the threshold back down.

[RarlyL8]

I haven't had time to read all the info Marty but I sure will. I am a big fan of BW/KKK if for no other reason than durability.

[copbait73]

This is the performance turbo product line selected for the new Indy Series engines. They allow the teams to use as single or pairs but must be from this series. No other turbo makes are approved.

Not terribly expensive considering you use the internal W/G, saving the $s of the twin remote W/Gs.

[jonesb930]

Also the integrated blow off valves save money as well. Figure $1-300 for a nice set of Blow off valves.

[Pelle Persson]

anyone thats tryed precision turbos?