So I'm looking for a bigger turbo to meet the goals of an engine I'm in the process of building. Engine is a B16 looking to make 500-600hp and would like to have a small amount of room to grow, turbos I'm deciding between is the precision 6262bb or turbonetics gtk 650, few questions I have is the 6262s billet wheel a lot better than cast on the gtk? And I also thought I read somewhere on this forum that I have to run an oil restrictor on the 6262 I guess some guys have had them fail? I called precision and who I talked to didn't seem that helpful and said he never heard of the issue and they don't know why I would need a restrictor? So IAM kind of lost can anyone shed some light?

 

If your engine produces more than 65psi of oil pressure (and all b series do) then you need a .065 restrictor with any journal bearing turbo. The billet wheels are far more advanced than cast wheels which is why so much power is being made on smaller wheels. The old 67mm caast wheels were usually goo for 700-750whp and now the 6266 will do the same and the new 6468 will produce almost 900whp

 

As long as the billet wheel design is an improved design over the cast, yes. But not from material alone. Just reminding ya

 

Agreed, I should have explained that better

 

but its billet.... so its sooooo much better anyways (sarcasm)

 

iam going to buy buying one of them BALL BEARING, no journal, so still running restrictor? why do you guys think precision is clueless on the whole restrictor thing?

 

any ball bearing turbo requires a restrictor. I know when i had a garrett ball bearing CHRA i was running a .035 but consult TheShodan on this one for sure on that size

 

Unfortunately, Precision does not use the case-by-case basis analysis that is needed in order to properly inform people as to whether or not a restrictor is needed. Even Garrett's simple guidelines at least makes it a bit easier to determine a likelihood of whether or not to use one.

Precision does not go by either engine platform, a standard oil pressure for the CHRA channels, or any other criteria. This is why you hear this with such debate. Even the DSM guys deal with Precision's advice on the location as to where the oil should come from.

Since PTE uses ceramic bearings with no water cooling, (which I never thought was a great idea anyway) I'm quite sure the tolerances of the bearings on the shaft are a bit tighter than the journal bearing, so like the Garrett steel ball-bearing, I'm sure they use some restriction of oil for that system.. Just not sure if its based upon Garrett standards or something else. At least in that area I would hope that you could contact Precision to get a straight answer for the ceramic ball-bearing cartridge.

Good luck.

 

ive got a 6262BB,

it comes with a built in restrictor, and its marked with a yellow paint so you dont **** with it,

I run -4 straight into it and it runs perfectly, do not put any other restrictors on it else void your warranty.

the safest thing you can do is e-mail precision, get them to put down on paper on what you should run, run exactly what they say, then if it fries because of too much / not enough oil, you can get warranty on it.

but more oil is always better than not enough

 

if you have to much oil are not enough oil you can hurt the turbo