pte 6766 yea or nay?

[Scary]

Is anyone running one of the dual bb 6766's? Searched the forum but couldn't find much info... lots on the 62 and 64 though. Without compressor/turbine maps, I can't make heads or tails of why no one is running this turbo, where its ideal operating efficiencies are, how the hotside would change the spool/surge/choke point, etc.

If I run with a smaller a/r (like .68) could it feasibly allow me to tap the potential of this turbo? Or is it a complete waste of money, and if so, why?

[Etipp98]

Unless you have a setup that will support 800+, I would not be looking at this thing.

What is your current setup/ what are your future plans?

[Scary]

Future plans, full build, port injection, etc. Building for a BT.

The 6766 with the .68 hotside is rated for 700hp. I just want to know if it will operate efficiently in our powerband. I can't find anything concrete one way or the other.

[Karmat]

I dont understand why people buy such large turbos with such a small A/R. You will be close to 700 with a 6266 and a normal A/R. If you want more a 6466 is more than you'll need.

You are choking the turbo up top with a small A/R and losing the benefit of the larger compressor. What's the sense of losing spool with a large compressor wheel if you are limiting it with a tiny A/R.

[Scary]

Originally Posted by Karmat I dont understand why people buy such large turbos with such a small A/R. You will be close to 700 with a 6266 and a normal A/R. If you want more a 6466 is more than you'll need. You are choking the turbo up top with a small A/R and losing the benefit of the larger compressor. What's the sense of losing spool with a large compressor wheel if you are limiting it with a tiny A/R.

Fair enough. The main reason I was looking hard at the 6766 is the price... I have a line on a brand new one for 1/3 of the price new and wanted to know definitively whether it was an inefficient choice for the motor.

[Chimmike]

6766 is a 1000hp turbo. You'd be looking at lag-city on that thing.

[Realgib3]

Just get a JB 6266 and call it a day. That turbo is perfect for 450-800whp on a 3 and the JB version works just as well as the DBB, for nearly half the price.

[Chimmike]

nah, I'd get the bb version on a turbo that large. I'm glad I got the bb 5862.

[Justin@Freektune]

Agreed the 6266 spools really fast and is still capable of hitting 800.

Originally Posted by gingermike nah, I'd get the bb version on a turbo that large. I'm glad I got the bb 5862.

I assume if you were upgrading your meth nozzle that you are approaching 500?

[Chimmike]

Well, heh. had a vdyno a couple weeks ago, actually two, well above 500. Rob has high opinions of this turbo, just working out the fueling.