sixshooter

iTrader: (12)

Ugh. Nope.

1991

whats that for?

borka

iTrader: (1)

here is the bent wheel one for $150
WA S15 T28 Turbo - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

and a good one for $500
CA For Sale T28 S15 Turbo - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sixshooter

iTrader: (12)

I wouldn't spend but $150 on one with a good wheel, but that's just me.

borka

iTrader: (1)

you would not spend 150 on a s15 ball bearing 2560r? Interesting... It's a great turbo. Not to be confused with the s13 journal bearing sr20. Which is also ok turbo and yes cheaper around $100-200

18psi

iTrader: (76)

totally random/off topic: have any of y'all compared same size "BALL BEARING!!!1oneone" to "journal bearing...ugh" actual data with respect to actual boost threshold?

the results may surprise you

1991

Its not bad, but after a new wheel and gettingit balanced we're talking 400 plus any shipping, and time. Ill message him, but seeing as its a high miled turbo as well idk.
^This is why im torn comparing what i have to the big girl

18psi

iTrader: (76)

Oh I wasn't talking about your turd of a turbo. it sucks. that part isn't up for debate lol
and the 2876 .86 will also be a dog below 5k
My whole thing with BB vs JB was that in my testing, spool was identical on identically sized turbos

sixshooter

iTrader: (12)

Do you know how much it costs to replace a wheel and rebalance a BB Garrett turbo?

Don't waste your money.

1991

found a wheel at about 100$, how much does balancing cost?

borka

iTrader: (1)

if i remember correctly, when i bent my wheel on my 2560, it cost me i think 350 or 450 to upgrade to a billet wheel, so im assuming a stock cast wheel is much less.
I used pureturbos, no complaints with their work, turbo worked great once i got it back.

is it me, or have s14 s15 sr20 turbos went up in price? i see them for $500-600 now days, and i remember they used to be $250-350.

1991

They have for sure. My bro brady built his s14 a few years back and I remember him selling his turbo for a measly 200$. Might have been an 13, but I coulda sworn it was BB.
Hmm, so I might as well just buy a working condition one, as low boost levels wont see a benefit from an upgraded wheel quite as much.

andyfloyd

the only difference in the BB and Journal will be in transient response. Im sure you already know this but the OP may not.

andyfloyd

must be all the drift kids ruining stuff and needing replacement turbos in their S chassis cars

1991

which is why this one i have is so bad. Every shift it's back to square one. Starts building boost at like 2500 but not the measly 9psi i want until after 4k. The big BB will just be a fun runner. No it wont be a canyon carver but i do a lot of roll racing (i know selling the mx6 for another miata was dumb) and it will be decent at that. Should build it fast when its there and after shifts im back at over 4k almost everytime. I have a 4.1 torsen though unfortunately.

andyfloyd

The Churbo is notoriously bad at spooling, that is just an absolute trash turbo that is only good at being a huge dummyface.

1991

I feel likea dummy face for owning it

18psi

iTrader: (76)

Correct. And it's measured in milliseconds, and your average joe would have a hard time even telling the difference unless they knew.

1991

Its possible that im wrong, but any dyno ive seen says otherwise. Some see a 500rpm peak boost difference. Especially on miatas. Garrett (prolly hype to sell turbos) says a possible 15% increase. I know a 2554r vs stock sr20 turbo has a really nice increase and they are dead *** the same size. And my buddy went from an sr20 turbo to a, bb 2860 i wanna say, and it also spooled slightly faster. But none of these take into account wear and tear. Bearings over time have to cause more friction and most dont test an old jb to an old bb, most are old jb and a new bb. Idk, tell me if im wrong and its all a placebo effect or something, im all ears

andyfloyd

Spoolup and transient reponse are two different things. The spoolup between a journal turbo and ball bearing starting at say 2000rpm ( assuming the same compressor and turbine ) will be identical. The thing about Ball bearings are in between shifts, on/off throttle at an autocross etc will be improved...thats your transient response. Say your turbo hits full boost at 3500 rpm.... one is ball bearing one is journal, if you are cruising at or above that rpm and stab the throttle the BB will respond faster. Im sure I did a terrible job of explaining it but you get the idea.