buying 61 trim...how should i mount wastegate?

[greathuskie]

ive decided to get a 61 trim i think, from what i understand, this car will push out as much HP on pump gas as a 50 trim at a lower psi, but then i have the option to go to race gas or meth injection later to bump the boost and power up. now i need to figure out how im gonna mount the wastegate.

also if anyone has any better ideas for a turbo let me know, i dont think a 50 trim is gonna take me where i want to go.

 

[kspharris]

I would just mount it off the collector on your tubular exhaust manifold.

 

[Steve93Talon]

What is a 61 trim? Do you mean 60 trim? T61? 61mm? Bigger isn't always better on pump, that's why 50 trims and 3076Rs do so well. Good efficiency at typical boost levels that most people on pump can get away with and decent spool up for a nice fat powerband. You can also look into the Borg Warner S200/300 turbos.

 

[greathuskie]

PTE SCM61 is what i plan on buying.

 

[DoyoFCT]

this is an o2 from punishment racing, im going to be running a sc61. this piece is absolutely beautiful, very good quality and backed up by an excellent warranty!

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[greathuskie]

ive been looking at the SBR manifold, but the thing that concerns me is the WG flange is on the #1 runner and not the collector, how big of a problem will this pose for a turbo of this size?

 

[dsm-onster]

What is a 61 trim? Do you mean 60 trim? T61? 61mm? Bigger isn't always better on pump, that's why 50 trims and 3076Rs do so well. Good efficiency at typical boost levels that most people on pump can get away with and decent spool up for a nice fat powerband. You can also look into the Borg Warner S200/300 turbos.

Typically a larger diameter exduce does yield a higher efficiency at a certain boost or the same efficiency at a higher boost.

Nevertheless, boost itself is the chief determinant in the amount of heat added to the intake stream. When air is compressed, it rises in density & temperature regardless of compressor efficiency. Compressor efficiency is a percentage. Now a compressor that is more efficient at said boost level will be add less heat. but what is the difference in heat from 75% efficiency and 70% efficiency?. . . As most compressors properly chosen to the flow goal will all be w/ in this amount. If you can run a particular compressor at 25 psi on pump gas then one will likely be able to do the same w/ a compressor that is is 5% less efficient.

A good pump gas turbo has a proper flowing turbine (balance of spool for the hp desired) so as to yield a higher hp per psi number. All so that not so much boost is neccesary for the hp goal. Anyone who wants to run pump gas wants to run on the street and is concerned w/ spool time.

An proper intercooler almost totally negates the effect of compressor efficiency.

greathuskie, i think the benefits of a performance o2 housing out weigh the benefits of an high performance exhaust manifold. I say get an evo3 exhaust manifold and an o2 mounted wastegate (you'll get a good flowing o2 housing in the process). I believe this rout will be the same price as a manifold w/ a wastegate mount and a performance o2 housing. As you tune if you realize that the evo3 manifold is holding you back you can always sell it for what you paid for it, perhaps more.

 

[greathuskie]

what do you guys think of an internal gate on a turbo this size?

i might drop to an internal gate 50 trim

 

[dsm-onster]

Usually, the problem w/ such a high flowing turbo as this is that once you're CAPABLE of flowing such, an internal gate will blow open. If the turbine is properly sized or if you have a strong enough spring or extend the leverage the wastegate arm has against the wastegate flapper then you're OK. Still, not many guys go this big w/ an internal gate.

My *opinion* about wastegates may or may not help your setup function properly.

 

[DirtyBirdRacing]

I would mount an external wastegate off of the exhaust manifold collector.

Bill

 

[GVR4592]

What are your goals and how much do you have to spend?

 

[greathuskie]

What are your goals and how much do you have to spend?

i want to spend as little as possible of course, im on a college budget. but i have the supporting cast to run a turbo of pretty much any size, so id like to go big or go home. i can get an o2 housing, wastegate, and this turbo for 1300, and id like to get a new manifold too, so im considering just buying an internal 50 trim for the time buying. that sounds like my best option, and im sure i can go low 11s with one with my setup.

 

[GVR4592]

Sounds like you have it all figured out, the 50 trim is a great turbo.

 

[Maglin]

If you are looking to put down some serious power and you are going to buy a new manifold don't bother with the SCM61. Just get the SC61 and a good manifold and External WG. It will cost you more but just save up for it. You will appreciate it in the long run. Internal gates are just a PITA. If you really ever want to run some serious boost pressures they just can't handle the exhaust pressures and blow open.

 

[greathuskie]

ordered the FP race mani and a 50 trim internal for now

ill likely upgrade to something quite a bit bigger next year when i have more money.

 

[greathuskie]

where do you guys recommend i get a stainless steel oil flow line, along with other stuff ill need to install?

 

[GVR4592]

Forced Performance has one of the best oil return lines for our cars, it fits much better than most of the other kits out there. They also have decent prices on feed lines, gaskets, and miscellaneous hardware needed for the turbo install.

 

[Maglin]

I'll second FP and Extreme PSI also has great products and prices.