sparky

iTrader: (1)

I will be swapping my JB Red out for the BB BBK-B. Does anyone have any idea what sort of improvement I should expect in terms of turbo spoolup? All other hardware will remain equal. Should I expect a 500-600 RPM difference?

What do you guys think? Any direct experience invited. Tuner's comments appreciated. Of course, everyones comments invited.

ctfpevoVIII

iTrader: (4)

I have never had a bb red , but from looking at peoples dyno graphs I would say that there pretty comparable in spool to the bb bbk-b . Mine's hits 30# of boost at about 4350 rpm , but I'm running the 3.5" surge cover which is probably hurting spool a little. Also I think my tuner is making it spool a little later to keep the torque down.

sparky

iTrader: (1)

Thanks for responding. My Red is a journal bearing turbo. So, I will be going from a journal bearing Red, to a ball bearing B.

Comparing apples to apples, I vaguely recall that a JB "B" spools a couple ticks quicker than a JB Red. Supposing similar aero design tech on the comp wheels, this goes to reason since the "B" is smaller and thus has a lower mass, lower inertia rorating assembly.

If the JB version of the B spools a couple clicks quicker (say 200-300 RPM), than the JB Red, then we have to assume that all else remaining equal, a BB version of the B should likewise spool 2-3 clicks sooner than a BB Red.

I figure that my BBK-B should spool about 500 RPM sooner than my old tech JB Red. What do you guys think? Can I hope for a 500 RPM improvement in spool?

evo unknown

iTrader: (25)

There have been graphs that show the BB-BBK-B spool identical to the BBK-Full. Therefore, it should outspool the FP Red, depending on your set up, I would guess at least a few hundred rpms.

High_PSI

iTrader: (50)

Just so you know, Ball bearing does absolutely nothing to increase spool. All it does is increase response once things get going. I had a JB Red and then a BB Red, night and day in response, zero difference in spool.

BDecker9

iTrader: (2)

From Garrett:

sparky

iTrader: (1)

Thanks. This gives me a good idea relatively of what to expect in terms of spool. I had an OS Green on my car. And I think that the Full spooled about in the same league with my OS Green(just more power, of course). So, I can extrapolate. I should be happy with my new acquisition.

blackenedwings

Yup, the BB BBK-B hasn't gotten as many dynos as I would like to see, but its on my list for future upgrades. Please post your dyno when you get it.

High_PSI

iTrader: (50)

Such B.S. It doesn't spool better HOWEVER it stays spooled longer between shifts and the transient response is amazing. Teh JB is very uniform and drops between shifts.

That said always go BB when you can.

BDecker9

iTrader: (2)

I'm not sure if I would argue with the engineer that probably wrote that. As much as people **** on Garrett, they're still the premium turbo company in the world, and sell way more turbos than any other company (maybe Holset is 2nd). I wouldn't argue with their Engineers about their R&D

High_PSI

iTrader: (50)

You can't change physics man. It certainly spools faster between shifts as it stays in boost longer due to BB. But you are accelerating a known mass to a know speed. Nothing changes in that I promise you. I have gone back to back between a JB Turbo and a BB Turbo, same exact wheel (Went from a JB Red to a BB RED)

The initial spool is the same. The add was probably written by a sales guy misunderstanding the logic that Engineers have. The biggest benefit of a BB unit is that it stays spooled between shifts, that is a massive advantage.

BDecker9

iTrader: (2)

Speak to Garrett about it, I'm not debating it. I could care less between the difference. A turbo is a turbo, whether big, small, medium, bb, jb or wooden I just know that's what Garrett says.

94AWDcoupe

iTrader: (125)

-yep garrett is just plain wrong on the 15% quote. I have had same experience HighPsi is trying to convey, Bb doesnt do squat for initial roll on spool up.

GTijoejoe

iTrader: (25)

No offense...but I'm going to bet they have equipment to measure such a thing much much more sophisticated then you do which proves their information correct, otherwise I doubt they are in the business of publishing false information

now, it maybe for a specific situation hahahahaha

hiboost2.0

iTrader: (15)

+1 I was going to say the same exact thing but you beat me to it.