Since the Full doesn't really suffer from lag to begin with, then I believe the law of diminishing returns is the reason that you won't see an equivalent improvement in the Full.

I bet money that Chad says that they'll see an improvement, but if they already have a JB Full, then their money would be better spent on other mods/improvements than whatever the cost would be to upgrade it to a BB Full. I believe that has been his position on the issue for awhile now, and I honestly respect that so much, since many other companies would be more than happy to upsell you to the next best thing, even if you don't even need it.

 

Ditto on Chad's integrity and good intentions. I agree that if you already have a Full then having it converted to BB may not really be worth it. I was just analyzing it from the point of view of someone who does not already have a CBRD turbo.

I guess that for me it might be useful to see an overlay of the boost plots of a JB Full vs. BB Full, and a JB BBK-B vs. a BB BBK-B given the same setup(preferably a stock block).

I am particularly interested in more detail about spool up characteristics. I want to find out at what RPM the crossover point(threshold) is achieved with these different turbos because my car is basically a JDM VIII RS with the short gear box and I do mostly tight canyon driving and like to short shift it. My JB Red just didn't cut it on my little stretch of mountain.

At the same time, I would like more power potential than a Lite/White stock turbine wheeled turbo can provide for when I do take the car out on the highway though. I am worried that the BB-BBK-B/BB HTA Green class of turbo may be great on the highway but would spool up too late for my tight cornered mountain road.

I may just end up ordering a BB-BBK-Full as it is probably going to be the best of the lot at placing the fat part of the compressor map where I need it at 3400-5400 RPM. But, I will be giving up 50 WHP to a BB BBK-B for highway use. So, for me personally it is just a tough choice. This is why I am asking so many questions about the BB BBK-Full. I am thinking that it just might give me spool up similar to a JB BBK-Lite but with more punch up top.

 

Well, in that case, then I totally think it would be worth it for an autocross set-up where you're looking for early spool and immediate response.

IIRC, the JB Full is spec'd as spooling roughly 200-300 rpm slower than the stock IX turbo, and the BBK-3B will spool on par with the JB Full, so yeah, pretty darn close to equivalent with the stock IX turbo. However, given your goal of maximizing your set-up for roads with tight corners, and assuming that means very little time spent above 6 or 7k rpm, then I think you're right to be leaning towards the BB Full. I'm setting mine up for mostly highway use, and the occasional road course track day event, thus the BBK-3B. I recommend that you at least send Chad a PM, or give him a call to discuss which route to take. I'm sure he'll get you squared away, and feeling like you're making the right decision either way once you're done.

 

The BB lite would be ridiculous! I'll build one and test!

Cb

 

 

Khoool.

 

Would you think that a BB-Lite is gonna require the surge ported compressor cover? Probably, huh? Because if the BB BBK-Full requires it then it goes to reason that a BB-Lite would need it even more so. It would have the same compressor but spool up at an even faster rate and significantly sooner than a BB BBK-Full does. Chad has further convinced me that he is way khool.

 

LMAO- thanks sparky (sounds like national lampoons)

yes Ill be building it with an antisurge cover-



maybe even a Ti turbine-

cb

 

think about a Ti in the bb bbk c.

 

BBK lite can use the MHI Evo 6.5 TiAl turbine wheel. I don't think Chad is going to cast a TiAl turbine wheel for the BB BBK C (as cool as that would be).

 

I remember asking you for a Ti turbine 6 months ago lol

 

Erik: Wow, that homegrown is really freeing up your synaptic connections. I don't think that he'd do it but it is an intriguing idea JK

I remember that once, long ago, someone suggested configuring the standard JB Lite with a TiAl turbine wheel and Chad nixed it. He really is ultra careful about his proprietary turbo designs, as well he should be.

Anyway, I am going to buy a BB-Lite as soon as Chad gets done testing it. Even configured with the standard inconel turbine wheel it should be a real terror. The aero design of the BBK compressor wheel is extremely efficient and combined with the low mass turbine wheel and the ball bearing center section it will be just what the doctor ordered for my canyon flyer.

 

Clyde, are you sure you don't want a BB BBK Full?

 

Wow, justincase, I reread Chad's response and he did indeed state that he might configure the BB-Lite with a TiAl turbine wheel. I don't believe it! This is indeed great news and cause for celebration.

I guess that Erik hasn't been hitting his homegrown stash afterall!

There are basically two different MHI TiAl turbine wheels that Chad could use. One is that found on the 6.5 TME turbo. The other is the one that is used on the JDM VIII RS turbo. The two wheels are in fact slightly different.

The better one is the JDM RS turbo wheel as it is slightly larger and thus creates less back pressure than the smaller wheel on the TME turbo. But, in the end either one would be OK with me.

 

Erik, buddy, you are mixing me up again. Chad just has so many options. During the interim while Chad is developing a BB-Lite, I am hoping that we'll start seeing reviews from new BB-Full users. Then I'll make up my mind.

Yeah, I just don't want to go any bigger than a BB-Full. I know I don't want a Green or a BBK-B. I want quicker spool. This is for driving on roads like Tuna Canyon and Rambla Pacifica in the Santa Monica Mountains.

Your suspicions are right. For me the choice is indeed between the BB BBK-Full and the yet to be BB-Lite TiAl. I am torn and I just haven't made up my mind.

The BB Full would probably be the better all around choice. I just have to wait and read some results. I'll make prepayment to Chad and then pick his brain before I make my final decision.