Cam73

Hey guys-
Was kicking around the idea of using the turbos I have laying around for twins..

Looking for a medium to toasty 500 at the wheels and good around town quick spool (37s with 3.54s). DVs, injectors and plate profile to suite.

Wondering if anyone has tired an HX35 with 12 cm housing over a box BW S366 ETT? I'm currently running the S366 with an ED 14 cm waste gated housing (t3) as a single but also have the stock .91 a/r divided turbine housing (t4). Plan is to open up the wastegate to 7/8-15/16", drill the divider and use a 1/2" spacer on the HX35. Considering the 60mm upgrade. Is trying the 14cm housing on the 366 and running both turbos gated because its such a small set a ridiculous notion? Or go right for the .91 non gated?

Kind of a budget reproduction of BDs town twins with out moving into the 300 frame for the secondary.

I would be building the set but only if its worth the effort. Unfortunately, the primary would be pretty limited in terms of room to grow and I don't see sinking much money into the Hx with out just starting fresh with a more standard 300g or 62 over s475 twin set.

Last but not least, what does everyone think of using a 2 piece cold pipe like in the BD set up? Might add flexibility for future turbo changes.

Thanks

Townsend600

just run the S366 as a single and throw in a set of injectors and tune your pump. I run a bigger turbo than that as a single.

Cam73

Thanks, but I am running the 66 as a single, have injectors, some pump work and don't care for the turbos characteristics. Hence the reason I asked about twins..

Tate

I wouldn't do a hybrid on the HX if you're gonna go through with this. If you could get a bigger housing for the S300, I'd try that, although that lessens the budget theme of it all.

I say build it and find out. You've got the expensive parts in your possession already, the rest is just pipe and some oil lines, for the most part.

Cam73

Thanks.

Are you thinking a bigger hot housing or a race type cover for the compressor?

I'm not sure about the rotation of the hx vs an s300 charger but if the cold pipe and intake pipe could carry over to a 300/400 set in the future that would be ideal. Material wise, the hot pipe is not real spendy.

Unfortunately, for what I'm after the S366 just doesn't make a great primary or secondary.

If this set could make power like the S366 does as a single (with out excessive drive pressure) with less RPM and spool up it would be a success.

Need a block and head for mock up.

JQmile

It would probably work, although it also would makes sense to sell the 66 and just buy a larger turbo off of somebody.

AH64ID

It would be like the BD Tow twins... quick spool and decent air.

Tate

You would come out ahead. A S475 from FI is $650 brand new. Could sell your S366 for somewhere in that ball park.

Cam73

OK new plan!
Stumbled across a free GT4294NJS off a 60 series Detroit. Needs a rebuild and hot tank but appears to be in pretty good shape otherwise... Guess it would be considered a 70.3/82 with a WG 1.15 A/R turbine housing in it. Could try to it under an hx35 for a total budget build. Compressor has 5" hose inlet and 4" v band outlet, turbine has a T6 foot and 5" v band outlet.

Any guesses how it will work?

EDIT-
I think the turbine outlet is actually a 5.75 full marmon

http://www.himni-racing.com/index.ph...qen50b3efpe2q2

AH64ID

If it uses the same wheels as the standard GT4294 its a 70.3/75.1. Garrett lists the turbine inducer size on their site, and you have to use the Trim to calculate the exducer size. So the comp wheel is a 70.3x94 and the turbine wheel is a 82x75.1.

Mike Holmen

The GT4294 will work, but a bigger compressor wheel would be handy. Could always buy a GT4202 impeller and trim the compressor housing.

You planning on modifing the turbine housing on the 35? The 12cm is pretty small and will choke up pretty quickly. I would run at least an external gate, so the 35 doesn't cause you issues.

Cam73

I was planning on doing the standard mods to the hot side of the 35 that are listed in the first post.
Do you know where I could get the bigger wheel for the GT or the specs for the compressor housing machine work? It seems this gt 42 requires more specialty parts to hook up compared to the standard s400.

Mike Holmen

You would have to measure the thickness of the wall of the inducer. I would say yes, you could as your only increasing the diameter by 4-5mm or 2-3mm on each side. I have one turbo going from a 95mm to a 106mm turbo, there will be hardly any inducer sleeve left, so I'm going to have to buy a new housing.

Still think you'll have issues trying to get the exhaust by the wastegate, even doing your mods. I would use an external gate of at least 38+mm in size. Probably easier in the end than doing the mods that you have listed. What kind of compressor discharge flange you have on the GT4294 turbo? Most of that stuff can easily be machined up on a lathe.

Tate

Probably cost more money to buy a GT4202 wheel and housing (or have his machined) than it would to buy a brand new S475. And if small twins is the goal, then the 4294 should be fine. Lots of guys like the K31, which is roughly the same size.

Cam73

Hey guys-

Thanks for all the help. Small twins is what I'm after for drive-ability sake. The cost of the supporting mods to hold together the power a s366/480 set doesn't make sense right now.

The compressor outlet is what I think would be considered a 3.5" v band. That is the size I'm seeing listed for the GT42.It has a small recess to accept the opposing flange, minus wall thickness and it probably ends up around 3" ID.

Any concerns about the 1.15 waste gated housing on the GT42?

Its starting to look like the hx will end up costing me almost as much money as a small s300 by the time its able to breathe well enough to keep up.

I think I need another new plan..