Considering an Eaton swap on my '04 Mach 1

[JeffreyCole]

Even at that, you have to consider the base size of the turbo, as all the exhaust has to pass through the small hotside FIRST, and then through the larger hotside once it has done the work. You could risk running into the choke point of the turbine pretty quickly if the turbo is undersized, which would cause exhaust back pressure to rise dangerously high and drastically lowering your knock threshold, especially on pump gas. a 30R hotside is really designed for a very small displacement engine.

Hell even the 3582R is designed for 2.0L to 4.5L engines per Garrett's literature.

http://turbobygarrett.com/turbobygar...harger#GT3582R (1)

[sutyak]

Even at that, you have to consider the base size of the turbo, as all the exhaust has to pass through the small hotside FIRST, and then through the larger hotside once it has done the work. You could risk running into the choke point of the turbine pretty quickly if the turbo is undersized, which would cause exhaust back pressure to rise dangerously high and drastically lowering your knock threshold, especially on pump gas. a 30R hotside is really designed for a very small displacement engine.

Hell even the 3582R is designed for 2.0L to 4.5L engines per Garrett's literature.

http://turbobygarrett.com/turbobygar...harger#GT3582R (1)

I figure a properly sized wastegate for the 30R turbo would be more than sufficient to limit the back pressure. The wastegate for the smaller turbo would dump upstream into the larger turbo's turbine inlet.

[JeffreyCole]

There is a huge thread on Yellow Bullet regarding this.

http://www.yellowbullet.com/forum/sh...d.php?t=216811

you still have to run the majority of the exhaust gasses through the turbine of the small turbo, so even a 60mm wastegate (huge) could still cause issues if the turbine is simply too small for the engine.

TWIN 30R's would make for a damn nice, responsive, powerful setup... but a single does not belong anywhere near a 4.6. Just too small.

[SlowSix]

Fwiw, I'm running a 6665 .81 a/r turbonetics on a 232 inch cube v6. Full boost by 3800-4000 ish.

Slightly big for a stock motor car on my part. But what you have is probably typical for a 4.6 car. The smallest I'd go would be like a 6870 pte t4 .81 a/r on a 4.6. Something like that would probably spool like a hammer

[Tom]

The smallest I'd go would be like a 6870 pte t4 .81 a/r on a 4.6. Something like that would probably spool like a hammer

A 6262 spooled like a sledge hammer on a 3.8, so im going to a 6466, the 6870 would be amazing on a 4.6.

[Dickbag 5.h0]

Spool that big turbo with some nawwwzzzz on the low end

[sutyak]

I spoke with AGP Turbo about my goals (700whp for now with a bit of head room and big fat power band, not just top-end) and they recommended Borg Warner s366sx the http://www.agpturbo.com/borg-warner-...73-13009097049

Anyone have experience with BW or this turbo? Looks about right to me. 87 lb/min instead of the 120 lb/min I have now. Still a decent sized turbine wheel at 73mm vs. 75mm.
These BWs are cheap, too!

[Tom]

That would run pretty good, it's closer to a pte6466. It would probably max out around 850-900whp.

[somethingclever]

buddy of mine likes his compound boost on his stuff....big bottom charger and smaller twins feeding it.

[JeffreyCole]

buddy of mine likes his compound boost on his stuff....big bottom charger and smaller twins feeding it.

There's several tons of badass right there.

[JeffreyCole]

I spoke with AGP Turbo about my goals (700whp for now with a bit of head room and big fat power band, not just top-end) and they recommended Borg Warner s366sx the http://www.agpturbo.com/borg-warner-...73-13009097049

Anyone have experience with BW or this turbo? Looks about right to me. 87 lb/min instead of the 120 lb/min I have now. Still a decent sized turbine wheel at 73mm vs. 75mm.
These BWs are cheap, too!

Whatever you do, make 100000% certain you get the server duty thrust hardware. costs more money... but you wont be rebuilding it in 2000 miles.

[sutyak]

Whatever you do, make 100000% certain you get the server duty thrust hardware. costs more money... but you wont be rebuilding it in 2000 miles.

Thanks. I think this particular line comes with the severe duty bearings. One of the reasons it costs $250 more than the regular 300X line of turbos. I had to ask AGP about that.

[ttk53]

My car with nothing more than a little 2.3 tvs on pump gas

[sutyak]

My car with nothing more than a little 2.3 tvs on pump gas

Very nice. What car again? Cobra? Seems like great numbers from a 2.3. You should put some info in your sig.

Right now I'm leaning towards that Borg Warner turbo. First thing I have to do is get my base tune file from the tuner so I'll be able to make the proper adjustments. If I'm going to put the car in storage mode for the winter I won't bother buying anything until Spring.

[sutyak]

The same company that built my GTX2871R says they can also build me a GT37R, but that's as big as they go. Will the 37R turbine flow enough for a 4.6L? I know the compressor wheel he will use is going to flow up to 900hp, but I'm concerned about unnecessary back pressure from a smaller turbine side. It's not a standard GT37 from Garrett. It's one of his custom builds, so none of the wheel specs are on the Garrett site.

Here are some turbine comparisons:

GT3582: 68mm x 62mm (up to 4.5L according to Garrett)
Custom GT37: 74mm x 64.5mm
BW S366SX-E : 80mm x 73mm
PTE 7675: 81mm x 75mm

[JeffreyCole]

The same company that built my GTX2871R says they can also build me a GT37R, but that's as big as they go. Will the 37R turbine flow enough for a 4.6L? I know the compressor wheel he will use is going to flow up to 900hp, but I'm concerned about unnecessary back pressure from a smaller turbine side. It's not a standard GT37 from Garrett. It's one of his custom builds, so none of the wheel specs are on the Garrett site.

Here are some turbine comparisons:

GT3582: 68mm x 62mm (up to 4.5L according to Garrett)
Custom GT37: 74mm x 64.5mm
BW S366SX-E : 80mm x 73mm
PTE 7675: 81mm x 75mm

That depends on which housing you put it in. T3 or t4, what a/r?

[sutyak]

That depends on which housing you put it in. T3 or t4, what a/r?

T4. AR to be determined.