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2G 6466 turbo

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DSM_GSX01

10+ Year Contributor
985
13
Jul 27, 2011
La Junta, Colorado
Yes I wanna know how many of you are running the pte 6466 or 6266. And I will like to know what your numbers on hp are. will also like to know if your set up is t3 or t4. Thank you. Any help is appreciated.
 
I dont have dyno or track numbers on it yet but i have some spool numbers that may interest you.

I'm on the 1.15AR twin scroll t4 6466 and i dont see 30psi until 6150rpm. 37psi by 6750rpm. I'm hoping the 1.00AR will bring that down to 5500rpm. I'm a 2.0. Guys with the t3 housing are seeing spool a lot sooner maybe 40psi by 5700 on a 2.0 but probably will also top out sooner due to the 3" outlet. The t4 turbine housings havea 3 5/8 outlet so the backpressure is going to be less. My friend with the 1.15AR t4 twin scroll 6466 but with a 2.3 auto is seeing 40psi by 5500, he also tried the 1.32AR and said he said 100rpm more lag for him and hes an auto same 40psi.I'll be dynoing my car this winter on both housings on a mustang dyno at vivid racing arizona.

Thing hits rediculesly hard though, and i came from an hx40.
 
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Ok so better to stay t3 on turbo but will top out sooner? Also you are 5speed right? I want to stay t3 but everyone is saying switch to t4. I want to see boost faster. So which will be better? T3 or t4
 
T3 will bring boost faster but t4 will flow more.. It's up to you and your goals. I think grant at pte said with his t3 6466 he wasnt making power as easily with the 3" exhaust upword of 700whp. the twin scroll should spool faster though. I just picked a housing that is too big, they have a housing as small as a .84 divided t4
 
Ok and that's all t4 set up? I want have a goal of 850hp-900. I am a 2.3. Just want best what is for set up. I am currently hx40 t3.
 
I want to go twin scroll. And I see you can only get that in t4 correct. Just wants whats best for build. T3 or t4. I want more flow so I push more.
 
I'm on a .84 open T4. Car made 704whp and 574wtq at ~37psi on STM's dyno...so you know it's making some power. I would say that the .84 open T4 is too small, though. I would eventually move to the .96 and see what that does. Went a best of 10.1 @ 149 rolling out on a 1.78 60'. That was with a few degrees of timing and a pound or two of boost pulled from when on the dyno. Personally, I think twin-scroll housings/manifolds are a waste. Twice as many wastegates, dump tubes, vacuum lines, etc., for a couple of hundred RPM of spool. Simple makes the most power! In either T3 or T4, this turbo will make some serious power. I think the sweet spot is right around 1.0 a/r to get the best power/performance out of this turbo.
 
Nice that is nice info to know. I would like to go that way to like your set up. Have any pictures of your set up?
 
The gtw's don't use gt housings. Pretty sure they are regular t3/t4 center housings bored for the ball bearing cartridge.
It's actually a full journal bearing center housing design...so any T3 or T04E journal bearing turbine housing would work if you can get the wheel radius machined properly. Garrett does this so they can utilize the bigger GT40-style ball bearing cartridge on the shaft for better durability over the 35R.

If you're lucky enough to have or find an old junk FP3575, I'm 99% sure the FP31 turbine housing from that turbo would bolt directly on a GTW3684R (6262).
 
Someone else with a different housig will have to chime in. But if your 2.3 the 1.15 housing could be fine. Like i said I'm going to the 1.00 because I'm 2.0 but they also have a .84 but that is restrictive. The 1.00 is probably smallest I'd go without worrying about backpressure. Ive done tons of research on the 6466. Just no measurable results yet. Like i said earlier my friend with an auto 2.3 was seeing 40psi by about 6k 30psi by 5500
 
Ok well think I will just go with a 1.00 housing. Also twin does that mean that you run dual wastegates?
 
I was told the 1.00ts t4 is the same as a t4 .69 in size for spool for what it's worth. This was direct from grant at pte
To make better sense of what Grant was attempting to tell you, he apparently means that a 1.00 twin-scroll housing will spool the same as a .68 a/r T4 single-scroll when mounted to a properly-built twin-scroll manifold. Without a twin-scroll manifold, the twin-scroll 1.00 a/r housing is essentially a 1.00 a/r single-scroll housing with a giant divider running right through the middle of the housing's cross section.

So if you're using a single-scroll T4 manifold you're better-off with a .68 a/r T4 housing....and if you're using a full twin-scroll manifold, you're better-off with the 1.00 a/r divided T4 housing.
 
To make better sense of what Grant was attempting to tell you, he apparently means that a 1.00 twin-scroll housing will spool the same as a .68 a/r T4 single-scroll when mounted to a properly-built twin-scroll manifold. Without a twin-scroll manifold, the twin-scroll 1.00 a/r housing is essentially a 1.00 a/r single-scroll housing with a giant divider running right through the middle of the housing's cross section.

So if you're using a single-scroll T4 manifold you're better-off with a .68 a/r T4 housing....and if you're using a full twin-scroll manifold, you're better-off with the 1.00 a/r divided T4 housing.
Yup! . And For the record my spool numbers are with a twin scroll long runner manifold 1.5" ID primaries, two 44mm wastegates
 
Ok so a single t4 .68ar with 3 5/8 single will be fine. Give me numbers just like the 1.00 housing.
 
Are you buying a new Manifold or using your existing? If your using your existing what flange is it? I'll be able to give more info based on this and based on your goals with the car. Your 2.3 so that is already going for you.

A proper twin scroll will have true divided wastegates or two wastegates. As long as 1&4 are isolated from 2&3 your good.
 
I've never been fully convinced of the efficacy of a twin scroll setup on a maxed out setup for drag racing.
Are you buying a new Manifold or using your existing? If your using your existing what flange is it? I'll be able to give more info based on this and based on your goals with the car. Your 2.3 so that is already going for you.

A proper twin scroll will have true divided wastegates or two wastegates. As long as 1&4 are isolated from 2&3 your good.
I don't really like 2.3's on big turbo cars. You gain 500 rpms of spool, only to lose 1,000+ rpms of power up top.

I'm not really convinced of the efficacy of twin scroll setups on a maxed out drag setup. Road racing is a different story, but when all you need is 3,000 rpms at the end of the powerband, spooling a few hundred rpms quicker, for less choke flow doesn't do much.
 
I think if i was you I'd try the .83 AR t3 first see how you like it and if you feel you need more flow then look into another manifold/hot side. Sort of wish i did this, to do a back to back compairison from my stm t3 to topmount ts t4. but i had other motivations to go twin scroll t4..

Edit: just saw your goals are 850-900 I'd do the 1.00 ts t4. And if it doesnt get you quite there you can always go to the 1.15.
 
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Hi

I have a 6466 with 0.82 AR and 2.0l and later i build the engine to 2.2l from Magnus.

The Dynosheet is with 44 PSI and E 85 909 HP 280/276 Kelford
 

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