1

 

B20 is 84mm.....

atleast thats what my b20z is.

 

Sure is, but this benson sleeved B20 is 81mm

 

Who built the turbo for you?

 

Pure turbos, oceanside CA

 

From the spec's and your description it IS a 5831, just from another MFR.

 

Touche. Any ideas where this turbo can get me to? (googling nao) I'm considering selling this turbo and picking up a tab bit bigger turbo.

 

This

http://www.pureturbos.com/store/perf...rts-610hp.html

Or

http://www.pureturbos.com/store/perf...bullet-57.html

 

Are you suggesting buying those, or telling me what my turbo is compared to?

I just came across your posts of a b16 dyno graph with this turbo. Also read shodan's post saying this turbo starts to die down around ~450whp, which is a no no for me.

 

Looks like its rated at 610hp. Seeing that dyno graph you posted... 23-24 psi 475whp on a b16 with the 5831. I believe I can hit 28-30 psi with water methanol with a ls crank, would you agree? If I can push it beyond 30psi, I would, but I'm not knowledgeable of the turbo's capabilities.

 

That 610HP is rated at the crankshaft. The 5857 has a completely different turbine profile then the 5831. Both may show that they are the same trim, but the 5857's is the F1-57 turbonetics "big shaft".. much more capable of making close to 550 whp over 30-35 psi of boost pressure. on the other hand, the 5831 , uses the M237 stage 3 that is part of the standard Garrett line, which is not as efficient over 480whp..

At this point the difference is really going to be in the turbine wheel, and the compressor wheel will both be the same. There was no "in between "or "hybrid". Pure either used a Garrett turbine wheel or a turbonetics one.. to fit most of those housings in order to be that cheap. you can easily visually tell the difference between the two to let you know what you have.

For the price you paid, I'm willing to bet that they used less expensive Garrett one, since they are easier to find used, and incorporate as opposed to a larger turbine shaft.

 

I'm thinking so.. sigh

garrett 466159-5003

11 blade turbine

 

Yep. 57 trim with a billet wheel of unknown profile and material make up.. SDFI (San Diego forced induction at its finest.) :-P..at least the cartridge is a Garrett

 

The B16 was on 23 psi, probably at or as close at we are willing to push it as far as pressure. Upping the pressure really puts a lot of load on the thrust bearing and steel thrust bearings do not like a lot of load. We will be swapping some parts to try to make a little more out if the little turbo including an .82 ar exh housing to possibly allow us to extend the efficency range of the stage 3 turbine.

28-30psi is not where you WANT to be with this type of compressor wheel if it is a precision 6+6 copy.

 

How doea the comp 5857 or billet 5858 compare to the 5831? Is the comp 5857 basically the same thing?

 

Hard to say without having any real data on any of them, the PTE-5831 uses different compressor wheel and turbine wheels than the PTE-5858. I believe the 57's are using the turbonetics or similar exh wheel as Shodan mentioned.

If Comp uses a brass thrust washer that would be a nice improvement over the precision turbos, I really don't know why everyone hasn't abandoned that system yet, but it seems to be making it's way to more platforms.

 

steel thrust bearings really do hate heat, this it what caused a lot of precision turbos to fail back in the day. the steel retainer just built up heat until it blued and killed the bearing. brass is much more efficient at transferring heat.

and now you know my other gripe with precision... no compressor map means it's a crapshoot to know how a given wheel size will perform until you use it.