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SC61 turbine options input needed

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GSX_Dan

15+ Year Contributor
138
4
Jun 27, 2004
Chicago, Illinois
I'm looking at the turbine side options for the SC61 turbo and it comes in 3 sizes T350-52 (630HP), T04-69 (650HP), T04-76 P-Trim (680HP). Are these the same as the stage 3, 5 and P trim I see people reffer to as? My goal is 600AWHP on a built 2.4 and I have all the supporting mods to do it.(see bellow) Spool isn't an issue but I don't want to overkill it if I don't have to. These options are all in a .63 T31 5 bolt housing as that's the only option from PTE, ported T04S compressor cover for less surge...although I'm not sure if the 2.4 would surge as badly as the 2.0 with this GT40 compressor wheel.

Does anyone have any first hand experience with the different size turbine wheels? I'm more interested in how laggy the P trim is and if its even worth going to it considering the housing is only .63 A/R...could a stage 5 or even a stage 3 wheel net results within a 30-50HP range? I've made some decent power on my .48A/R stage 3 60 trim going 11.0 on my 2.0L with a 1.8 60' but this 2.4 seems to be a different beast and likes to breath tremendously in the upper RPMs making the small 60 trim obsolete at only 24psi. Any input is appreciated :D

supporting mods:

2.4L wiseco/eagle 8.8:1
magnus SMIM
FP3x cams
950cc w/walbro 255
AEM EMS
 
I would recommend the 6776RSP with the THF3-76 as the most suitable option. On the bigger breathing 2.4L, I think the 61mm wheel would need to be overspun to get that goal.

The 6152 uses the T-350 wheel which some people call the stage V. The 6169 uses a 69 trim version of the P-trim wheel. The 6176 would use the 76 trim version (most common) of the P-trim wheel.

PTE also has their new boosted line rolling out, you may want to look at their new boosted version of the 6776RSP if it's available.

- Brian
 
I have a 2.4L with a 6152e in a .82 turbine housing from PTE. Definately get the 4bolt housing not te 5bolt. The car made 420whp@20psi, 487whp@23psi pump gas, 515whp@25psi and 585@30psi. 32psi netted 603whp and 520lb/ft torque. On the street the car has 20+psi boost by 4k and pulls like an animal from there to 8500 and will pull higher if you let it. I think with an S-cover you will be able to make more power at 30psi since the S is HUGE on the GT40 compressor. I think it is the perfect 600whp street setup. I also had 960cc injectors and an AEM.

Later
 
Well I decided to go with the 76 P trim turbine in a .83 A/R housing. Lets hope I'm not giving the 2.4 too much credit and I didn't go too big on the turbine side.
 
Keep us updated on spool time and the characteristics of the turbo. I have a similar setup as you but I need to replace the t350 turbine wheel on mine, and the P trim with a BullsEye housing is one of my options.
 
Well the new turbo is on, I confirmed it is the 6176 by measuring the wheels, and I love it so far. Spoolup is fantastic even with a tubular header and I'm seeing 15psi by 4300rpm in 3rd, and by 3800rpm in 5th! That's getting on it from 3000rpm and intake temps of 30F. I haven't had any luck keeping the boost from creeping to 28psi on my 38mm Tial atm. dump with an 18psi spring , but it was kind of expected especially with the turbine side of the turbo flowing so well. I'm definitely glad I went with the largest T3 housing/wheel combo available as the lag is almost not even there on my setup, and I credit most of this to the awesomeness of the 2.4L!
 
I was going to recommend the 76 in the T4 and the S cover but seeing that you have the T3 you are going to need to go big on that set up and you did. :thumb:

I don't think you are going to see 600awhp with that turbo but if you dare to push it past 35psi and 8k rpm you might be able to get close.
 
I was going to recommend the 76 in the T4 and the S cover but seeing that you have the T3 you are going to need to go big on that set up and you did. :thumb:

I don't think you are going to see 600awhp with that turbo but if you dare to push it past 35psi and 8k rpm you might be able to get close.

We shall see, just to give you an idea how well this setup flows through the turbine side, my tial 38mm plumbed from the collector on a tubular manifold and atmosphere dump creeps to 25psi in 4th when it should be holding 1bar(spring pressure)!! I was quite shocked to see this bad of a creep, on my old 60 trim I never had problems holding the boost at spring pressure! I am uncertain if a Tial 44mm will keep this monster in check ... any of you guys running the 44mm and this turbo on a 2.4?
 
We shall see, just to give you an idea how well this setup flows through the turbine side, my tial 38mm plumbed from the collector on a tubular manifold and atmosphere dump creeps to 25psi in 4th when it should be holding 1bar(spring pressure)!! I was quite shocked to see this bad of a creep, on my old 60 trim I never had problems holding the boost at spring pressure! I am uncertain if a Tial 44mm will keep this monster in check ... any of you guys running the 44mm and this turbo on a 2.4?

I'm so sorry to deviate off subject. But, since when does boost creep demonstrate turbine flow?

I'm glad to see that you've found a hotside that yields the spool you're looking for. I think you've made an excellent choice! The p-trim isn't "too big", but certainly merits the compressor you've chosen.
 
I'm so sorry to deviate off subject. But, since when does boost creep demonstrate turbine flow?

The creep is only part accredited to the great potential of the turbine flow, the sheer increase in HP demands a bigger WG agreed, but with a more restrictive exhaust path (ie. 2.5" vs 3" turbo back) flow through the WG will increase and boost control better achieved. So apply the same theory to an increase in turbine flow, now the main exhaust path becomes less restrictive and less exhaust exits through a WG of the same diameter.
 
The creep is only part accredited to the great potential of the turbine flow, the sheer increase in HP demands a bigger WG agreed, but with a more restrictive exhaust path (ie. 2.5" vs 3" turbo back) flow through the WG will increase and boost control better achieved. So apply the same theory to an increase in turbine flow, now the main exhaust path becomes less restrictive and less exhaust exits through a WG of the same diameter.

I have seen noone have an issue like this with that particular turbine/compressor. Interesting.
 
I have seen noone have an issue like this with that particular turbine/compressor. Interesting.

Are you telling me a 38mm WG can properly manage boost(no spikes/creep) on a very well flowing 2.4L/SC6176 in 24F weather? If so there must be something wrong with my WG....I did notice the rubber seal inside it is kinked in one spot but I don't think its got a hole in it...
 
Are you telling me a 38mm WG can properly manage boost(no spikes/creep) on a very well flowing 2.4L/SC6176 in 24F weather? If so there must be something wrong with my WG....I did notice the rubber seal inside it is kinked in one spot but I don't think its got a hole in it...

I'd look at a little more closely. I'm not saying that a 38mm wg is enough, especially w/ a stroker. The p-trim flows alot! I'm just saying that I've seen 38mm wastegates do fine. I've never seen a setup running an 38mm running under 20 psi though. There verywell may be some creep issues that I've never come across. I guess all you can do is swap to a larger wastegate and see. If your absolutely sure your 38mm is opening properly. . .
 
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