Just a little more . . . . .

[PToombs]

I'm pretty sure I paid about $25 for 32 chrome plated steel lug nuts for my truck a few weeks ago. E-bay, and free shipping!

It's hard to find good help sometimes.

[DMan1198]

Aah I sure do love eBay for some things.

[PToombs]

I always search around, e-bay, amazon, and on the net in general. Sometimes you can save 50%, sometimes only 5. It pays to look, unless you are up against a deadline and gotta have it, then you do what you gotta do.

[DMan1198]

Yup against a deadline waiting a month for a couple of fittings just to save some money on shipping isn't a viable option.

[Remps]

I thought the truck was moving for a second as well lol. I like the way it looks, hopefully it hooks up now. A bb62 sxe sounds better than a garrett, and probably at least a little cheaper, I would hope.

[RCCUMMINS89]

Has anyone on here compared the ball bearing vs journal bearing? I haven't. However, I've heard arguments from both sides of the fence, on which is faster and why.

I will say (which I might be wrong), the argument that a journal bearing will out spool a ball bearing to me..... makes the most logical sense. Unless I'm missing something on why the ball bearing will spool sooner.

[fatty]

I've always heard the BB is faster because of less resistance to overcome in the form of friction.

[DMan1198]

Possibly the best example of less friction I've seen is a video by Ronnie pene spinning the wheel on his gtx4508r, and it just spun, and spun, and spun some more. I'm sure we've all spun the wheels on our jb chargers, and know how quickly they stop.

[Remps]

I think the biggest difference would be seen at lower rpms, during "threshold boost". Or what one might possibly consider journal bearing drag at lower rpms, before its forced to come to life and spools right up. I think a bb turbo would give a more linear spool up, and more low end air/boost. Once spooled right up I doubt there is much difference in performance between either version. The voices tell me low end lag must be at least partially caused by bearing drag, and not strictly an effect of wheel sizes. A few months back I heard bigblue24 over on CF was developing a BB turbo, my phone is way too slow to spend hrs searching for a link to it.

[fatty]

He did get that developed. They (PDD) have it on their website now.

Edit, found it. http://powerdrivendiesel.com/product/pd ... 16fd43adaa

[Remps]

Too bad they don't tell specs.. I am guessing gtx compressor wheel being 10 blade. I wouldn't bother if it wasn't a gtx, the gt versions have pretty lame compressor maps, unless one is looking for a bit cheaper bb primary.

[fatty]

I'm sure they would give out any numbers you desire. Will is a pretty good guy.

[ceelibs]

Has anyone on here compared the ball bearing vs journal bearing? I haven't. However, I've heard arguments from both sides of the fence, on which is faster and why.

I will say (which I might be wrong), the argument that a journal bearing will out spool a ball bearing to me..... makes the most logical sense. Unless I'm missing something on why the ball bearing will spool sooner.

BB has less rotational friction and needs less oil supply to lube them but journal bearing setups are more durable(as in long term use).

[RCCUMMINS89]

I've always heard the BB is faster because of less resistance to overcome in the form of friction.

However, with a journal bearing..... once there is oil, there is no resistance other than the oil. BB have a constant contact.

Possibly the best example of less friction I've seen is a video by Ronnie pene spinning the wheel on his gtx4508r, and it just spun, and spun, and spun some more. I'm sure we've all spun the wheels on our jb chargers, and know how quickly they stop.

With no oil, there is a huge amount of resistance in a journal bearing. BB without oil is not the same comparison. Point being.......with your air filter off.......shut the vehicle off. Our journal bearing turbos will spin for just as long as time.... and that's with the oil being taken away.





Again.... I'm not saying the information I am leaning towards is correct or incorrect. However, it seems to me that everyone has fallen into the bb spools faster, because well.... ball bearing sounds like it'll spool faster. And, not to mention, that everyone can pick up a bb turbo (with no oil) and it spins for a long time. However, more weight will spin longer as well..... which bb have more weight to spin under operating conditions. And I personally have never seen comparison (yet) that points one over the other.

So remember, I'm not arguing one way or another. I'm simply bringing up points.....

[DMan1198]

I can't really argue with that. Ryan Millikan did a test a number of years ago with a gtx4202r, and an ats a6k (iirc it's a 76/83 with a smaller shaft to reduce assembly mass) so they have very similarly measurements (though the gtx has a 10 blade compressor, and the a6k would be 7+7) and they spooled within 100rpm of each other in favor of the gtx, and made the same power (I can't remember which housing the a6k had, but spoolup between the .9, 1.0, and 1.1 are very similar, and most guys run a 1.01 housing on their 4202's in a single application) though I also know a couple of guys who've been disappointed with a gtx4202 on a 6.7 in terms of spoolup.