Largest Wheel on Stock Turbine?

[dr_frankenstein]

Whats the largest wheel that can be reasonably balanced on the stock 86/87 turbine?

is it possible to go as big as a 61mm 56trim wheel? I have one that I would like to use.

:biggrin:A.j.

 

[bison]

You should be able to get any T3 wheel on there but it woudnt make sense since you will be choked on the hot side before you even got anywhere on the compressor map. The largest id rec is the 58mm wheel the TE44 uses. The stage 2 turbo had this combo. Stock turbine , 58 mmcomp, .82 ex. Lots of backpressure when you run it hard.

 

[charlief1]

He's draw through Brian, just like I am. We're trying to reduce heating of the mix and increase volume before we get into the pressure increase. I don't know if you've read any of my turbo thread but if you'd like to make a comment on it click on the second link in my sig.

 

[bison]

He's draw through Brian, just like I am. We're trying to reduce heating of the mix and increase volume before we get into the pressure increase. I don't know if you've read any of my turbo thread but if you'd like to make a comment on it click on the second link in my sig.

So you want a higher mass flow at lower turbine speeds. Id look at the compressors with larger exducers myself. There may be some odd ball ones out there that will work in a T3 that are not commonly used in the performance world.

 

[bison]

Just read the thread. Looks like you have it under control:biggrin:

 

[charlief1]

Just read the thread. Looks like you have it under control:biggrin:

LOL Now you have a better idea of what Aj was asking you about.:biggrin: His is a little different than stock. Using a modified Edlebrock with an adaptor plate on it. His issue is volume related. He switched to the 84-85 exducer side and noticed a big spool difference but had a limit of 7 LBS for the boost. We're both trying to increase the capcity of the system so this seems like the most logical way to do it. Thanks Brian.:biggrin:

 

[bison]

LOL Now you have a better idea of what Aj was asking you about.:biggrin: His is a little different than stock. Using a modified Edlebrock with an adaptor plate on it. His issue is volume related. He switched to the 84-85 exducer side and noticed a big spool difference but had a limit of 7 LBS for the boost. We're both trying to increase the capcity of the system so this seems like the most logical way to do it. Thanks Brian.:biggrin:

Id try to locate a .48 a/r ex housing and have AJ try that. I know the T3's had a housing around that size. Getting it adapted could be fun. Id just fab a new dp myself so that the later housings could be used.

 

[charlief1]

Id try to locate a .48 a/r ex housing and have AJ try that. I know the T3's had a housing around that size. Getting it adapted could be fun. Id just fab a new dp myself so that the later housings could be used.

A .48? seriously? I've got the 86-87 housing for the exducer and an Eclipse 4 bolt housing but no wheel for it. Both are .63 but I don't think a .48 would help flow any. Both of us are using non stock down pipes. Mine isn't fabbed up yet though. I've got just about everything to go with a 3" internal but I'd like to go external for my own reasons. This is a touchy subject for some but I think the external will be the best option to keep the boost at managable levels for what I'm trying.

 

[bison]

A .48? seriously? I've got the 86-87 housing for the exducer and an Eclipse 4 bolt housing but no wheel for it. Both are .63 but I don't think a .48 would help flow any. Both of us are using non stock down pipes. Mine isn't fabbed up yet though. I've got just about everything to go with a 3" internal but I'd like to go external for my own reasons. This is a touchy subject for some but I think the external will be the best option to keep the boost at managable levels for what I'm trying.

It wont flow as much at high rpm but i dont think you will be flowing that much air that it will be a problem. It will increase the turbine speed a lot at lower rpm and boost will be higher. Id be building the engine for a max operating rpm of 4500. That intake cant flow too good keeping the rpm down and having immediate response would net better e.t.'s more often than not.

 

[charlief1]

It wont flow as much at high rpm but i dont think you will be flowing that much air that it will be a problem. It will increase the turbine speed a lot at lower rpm and boost will be higher. Id be building the engine for a max operating rpm of 4500. That intake cant flow too good keeping the rpm down and having immediate response would net better e.t.'s more often than not.

I was hoping on a max of 5500 and I know Aj was looking for a max of over 6K so I don't think it will work right. I agree that the stock intake sucks but it's been to 5K without to many problems and I've got to port it still but I have a few ideas on doing some extra mods to it. You really think I'll be limited to 4500?

 

[dr_frankenstein]

I totally understand what your saying brian,

in order for this work as planned, we need to make maximun boost as low as possible in the RPM range in order to see the full benifits of higher volume, vs boost pressure. this should almost be the first thing a non intercooled drawthru should keep in mind. this is important for us to remember when using the 301 housing with the 90* foot. Low RPM spool is key here.

Charlie, I have already determined that my low boost pressure was because of the added flow of the single plane, ported heads, and dump.... the engine quickly outflowed what the poor .42 stock compressor had. thus my pressure had dropped when the intake switch was made.

This thread has actually nothing to do with my buick.... infact I have already confirmed my use of the carbon sealed PT52 for my application.

the thoughts on the turbine, are aimed at my super duty 4. Where im 2/3 the cubes, and the stock 86/87 turbine looks good in terms of flow.

:biggrin:A.j.