Internal vs external wastegate garret gt3071 performance

[Mr_procrastination]

Hmm that torque certanly does look like a mirical
Nice hp, when does boost start to come on, when does it reach full boost (rpm).
How does the wheel hp figer translate to at the engine.
What suporting mods does the engine have.
sorry for all the questions but just looking at the options A.
Cheer

[Akane]

There's a million threads about it on mr2oc, you should check there for further info.

The americans with a real wastegate gets full 15psi by 3krpm

it translates to 292rwhp, which is approximately a guesstimate of 310crank hp.

turbo flows 35lb/min, which is approx~ 350hp worth of air.
For mods list, check http://toyspeed.blakjak.net/profiles/profile.php?id=15

[Mr_procrastination]

Hmm well after wasting more that a few hours on mr2oc it looks like the gt28rs internal gated is the go for a max of 300 whp, and the gt3071r external gated for anything more. One artical said the 3sgte was boosting 17 psi at 3250 rpm with the gt28rs on only a slightly moded engine, mmm sounds a bit early to me. So must start at around 2600 or something? thats redicules!! What is the average spool up rpm people getting on there modded engines? ( pretty open question i know, but just looking at nice and drivable everyday cars).
I never owned a turbo so dont really know what is considered lagy and what isnt.
Cheers

[Akane]

All I can say is......... :/

[Lith]

What do you mean by enlarged IIRC???. Id read that the unit has very good spool up, and had seen a couple of dyno sheats on ATP's web sight that tended to show good spread of power from the turbo with the .64 AR exhaust housing.
And it is my understanding that the internaly gated version uses the T25 housing.
Any ideas about the external gated version with the T3 housing?

Hey man, this is probably too late - I have actually been moving to Palmy and had no computer for the last couple of weeks, so sorry about the tardiness

Anyway, the main reason I said anything negative about the GT3071R-WG is that it runs a "cut down" GT30 turbine wheel to fit within a bored out T25 turbine housing, if that makes sense? Even bored out as much as possible, the T25 housing isn't big enough to fit the full GT30 wheel. Compare the wheel sizes between the GT3071R external and internal versions to see what I mean. I'd sooner go a GT2871R than a GT3071R-WG.

"Proper" (ie, externally gated) GT3071Rs have been used on many 2l engines with great results, a .63a/r turbine housing would definately be the go in my humble opinion. A GT28RS would be fantastic for 300whp, though why bother with the cost and the fabrication required when a CT20B can arguably get you pretty close to that?

[Mr_procrastination]

Hey Lith thanks for your input. Yea Id desided the gt3071r external was the way to go a. Why spend all the money and go for the small turbo??? makes no sence. Now all i have to the is deside if i go for the turbo or the paint. And seeing the dollar on the rise tends to make me think i should hold off a bit on the turbo to see if the price comes down any.

[Akane]

No, you got him wrong.

What Lith said, is that the wheels and housings are mismatched on the internally gated ones, you get a huge GT30 comp side but you get a tiny T25 exhaust side, you might as well go all out with a proper GT3040R, like I said before. Small turbo have their places too, if bigger is better then you bought the wrong car.

Lith, coz CT20b is not extreme enough Sif want bearing failure from overspeeding, shaft snapping.

[Lith]

What Lith said, is that the wheels and housings are mismatched on the internally gated ones, you get a huge GT30 comp side but you get a tiny T25 exhaust side, you might as well go all out with a proper GT3040R, like I said before. Small turbo have their places too, if bigger is better then you bought the wrong car.

Lith, coz CT20b is not extreme enough Sif want bearing failure from overspeeding, shaft snapping.

Haha I knew you'd like the CT20b bit Kenny

What are you on about with the GT3040R? I really wouldn't go with a GT3040R on a 3SGTE unless you want HUGE power.... there is probably like 700rpm difference in boost threshold between a GT3040R and a GT3071R, and a GT3071R will still make pretty damn good power.

[Mr_procrastination]

Hey Akane, sorry i ment smaller turbo being the gt28rs. And yea i understand the internal gated gt3071r has the cut down exhaust wheel to suit the smaller t25 housing.

[Al]

What 3sgte is this on and how modified is it?

[Akane]

Hey Akane, sorry i ment smaller turbo being the gt28rs.

LOL why are you sorry, if I wanted to do the "mad big turbo stylez" I'd kept my old GT2540R, which supports 260rwkw+

[Mr_procrastination]

for the miss understanding, i blame my perants for bringing me up to well

[Mr_procrastination]

gen two, full rebiuld, custom sump, everything dynamicly balanced, lightened flywheel,linished and shotpeened crank and rods,je forged pistons with rings, milded porting on the head and a good polish, klford cams, custom inlet, custom exhuast manifold, removed dizzy, twin coil wasted spark ignition, removed tvis, link(but will change to megasquirt) 38 mm tial wastgate... think thats most of it, toyoace cluch plate HD presher plate, 3y bellhousing, w57 box and more than a few years

[JustinSpiderholden]

gen two, full rebiuld, custom sump, everything dynamicly balanced, lightened flywheel,linished and shotpeened crank and rods,je forged pistons with rings, milded porting on the head and a good polish, klford cams, custom inlet, custom exhuast manifold, removed dizzy, twin coil wasted spark ignition, removed tvis, link(but will change to megasquirt) 38 mm tial wastgate... think thats most of it, toyoace cluch plate HD presher plate, 3y bellhousing, w57 box and more than a few years

HAHAHAHA I think that forge block has proberly seazie due to lack of use

[Mr_procrastination]

hey enough out of you thanks. I had the sump of 6 week ago befor i left and its all good in there only the slightest sign of serface rust on the counter balancing on the crank. Bores and the rest very nice. its been bathing in lube with ocational rotation so there

[Lith]

Hey Akane, sorry i ment smaller turbo being the gt28rs.

LOL why are you sorry, if I wanted to do the "mad big turbo stylez" I'd kept my old GT2540R, which supports 260rwkw+

Thing is, a GT3071R can make more power and will spool at least as well

[Akane]

Thing is, a GT3071R can make more power and will spool at least as well

Maybe one day i'll get that and then i can roll with the big boys.

[Silent Knight]

Thing is, a GT3071R can make more power and will spool at least as well

Maybe one day i'll get that and then i can roll with the big boys.

Big boyz don't roll in SWs. They have real cars.