?'s dual ball bearing vs traditional journal bearing
#1
?'s dual ball bearing vs traditional journal bearing
im interested in the actual real world differences between DBB and journal bearing
not copy and paste or ive heard this or that...
can the people with DBB turbos please chime in and let me know the experiences they have had with them good and bad....
for example spool time boost response, longevity, power, differences.. etc etc
thanks in advance
not copy and paste or ive heard this or that...
can the people with DBB turbos please chime in and let me know the experiences they have had with them good and bad....
for example spool time boost response, longevity, power, differences.. etc etc
thanks in advance
#4
thanks for the link but still im looking for a few people with them ON a LS1 CAR to chime in
actual real world dynos and experiences ive read plenty about them just wanna know how they work in our setups in the practical real world sense
actual real world dynos and experiences ive read plenty about them just wanna know how they work in our setups in the practical real world sense
#5
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i have put on both ball bearing turbos and journal bearing turbos.The ball bearing turbos spool several 100 rpm's quicker.For combos that are using a turbo on the large size for the engine it is a great help,otherwise ther is no great benefit-no real hp difference.I like the ball bearing turbos on the v-6 stuff we do.
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#10
i will add a basic comment
there is a reason that all OEM turbos have hydrodyamic journal bearings vs ball bearings. Ball bearings are good for reducing lag, but sacrifice longevity
there is a reason that all OEM turbos have hydrodyamic journal bearings vs ball bearings. Ball bearings are good for reducing lag, but sacrifice longevity
#11
We have spoken to CAT and Perkins about this....it comes from a money standpoint as to why they use journal over BB. Also servicing is easily done on a journal where its not on a BB, so that is a plus I will agree. Makes sense when you buy 200 turbos at a time. $300-$400 difference per turbo become a big amount after buying 200 or more. Especially at this time with $5 diesel.....cost has to be cut where ever they can. JZ would probably be the one to talk to about this.....he talks with the big companies quite a bit.
#12
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Again, its all down to cost.
#13
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i have not seem any longevity problems with ball bearing turbos when properly maintained,most of the problems come from people not changing oil and getting dirt in the bearings
#16
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But I can tell you like Shawn just did I did notice the difference in DBB turbos and Journal. Spool is quicker for sure and the boost drop from shifting gears in a manual is noticible. Now for another part of that is when making 4 diggit HP to the tires. That extra lag could be good for traction on the hit and when shifting gears on a clutch that could be on the edge of its power rating or traction again??? Just depends on the setup and what its being used for. Race cars I don't believe it matters a ton, as long as its properly sized somewhat LOL! They usually have time to spool at the line and then most are automatics so no real boost drop between gears. GL! This topic had been debated many times and it all comes down to personal preference. PPl can and will justify there choice LOL! Sorta like clutches and exhausts lol!
#17
Not LS engine, but I've used a 62-1 turbonetics with a .63 ar t3 housing and a GT35 with a .82 T3 housing on my car, the 62 with a JB and the garrett with bb. The garrett lights off at the same time, if not a little sooner and comes in harder than the jb turbo did. It is also making more power at the same boost as the old turbo due to the larger turbine. Never had either set up on the dyno, but the old jb went around 120 at the track at 25psi, and I think the new one will trap that now on 20 psi, judging by the data logs, but will find out soon. I had almost 30k on the jb turbo and it still had no shaft play. Cant speak for the BB turbo yet as there is only 3k on it, but I do change my oil every 1k miles on the car.