[Beau]

Last year we did some secret testing on the 6466 on Reid's car. Interestingly the 6466 came out the clear winner on a 100% bone stock 2J motor.

In this case here, you can see that the backpressure is the biggest reason for the lack of performance spread b/t the 64 and 67. The boost doesn't take a hit, so the lack isn't the compressor wheel here, is the backpressure. Higher compression motors seem to handle backpressure a bit better.

 

[TROLL]

I don't know much about this stuff but it sounds like you're saying the 67 is being held back... any guesses if going to a bigger exhaust housing would open up the 67 a fair amount? Or what it would do to the 64?
I was planning to pick up a 6766 in journal bearing and probably still am, looking at the slightly larger divided housing but haven't finalized my decision.

I also wonder how these turbos compare at a more common boost pressure like 18-20 psi and 26-28 psi for us mere mortals .

 

[Hurrakaine]

I'm going to run a 6766 soon, without the QSV, so I've yet to figure out what rear I want, though it will be smaller then most. I'll make up for it with Tomei cams, valve springs, a 4 inch midpipe/downpipe, and I'm going to run over 20 psi on pump gas. In fact, if I don't see any knock, I hope to run 25 psi on 93 octane. True story. If anything goes wrong, which I doubt, I'll build the bottom end.

 

[Sound Performance]

Let's put it this way. When we put Craig's car back together, it was with a 6766 and a .81 undivided turbine housing.

 

[Beau]

You guys will be seeing Mike Wise's dyno pretty soon. 6766 with .81 A/R It's another shocker.

 

[mkivsoopratt]

these new pte turbos are awesome!

 

[mkivsoopratt]

Bumping this. Is the .81 housing still the best option for a 6466?

 

[ajgibson528]

Great question, im also in the market for a 6466

 

[T6Rocket]

I'm going to go out on a limb and say yes! The .81 is the standard housing that comes with the turbos, meaning that's what Precision recommends. Also, I remember Larry saying the .81 was the best for all max power too.

The 6466 is a torque monster!

Al

 

[mkivsoopratt]

Questions is would it be a good idea to swap out a .96 for a .81?

 

[T6Rocket]

Yes. Unless you have something against fast spool-up, or don't have the tires for it.

Or if you're talking about a 3.4 stroker. Even then, a 3.4 + a 6466/.81 would hit HARD!

Al

 

[mkivsoopratt]

I want all the spool. Would I loose top end? It’s a stock piston bc rod motor. Kelford 264/272 vvti cams. Unported head. E85

The motor is coming apart to put the rods in so now would be the time to swap housings

 

[T6Rocket]

I want all the spool. Would I loose top end?

As already mentioned, the .81 is the ideal housing for the 6466. If you're looking for a top end turbo, you need a dinosaur turbo like a T88 or larger. A 6466 is not necessarily a top end turbo, it's best in the mid-range.

If the motor is coming apart to put rods in, I would also put forged pistons in. That's a lot of work for rods.

Al

 

[mkivsoopratt]

I’ve made a want to buy ad for a 66mm .81 housing if anyone has one.