PTE 6266: DBB or Journal - Lexus IS Forum
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post #1 of 3 (permalink) Old 03-03-2017, 08:34 AM Thread Starter
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PTE 6266: DBB or Journal

I know these topics go way back but it's been quite some time since I have researched turbos since I'm in the market for a new one so now I'm trying to gauge what the latest consensus is with newer technologies and designs. Is the DBB worth the extra $600-900 for a few 100 rpm better spool? How reliable are the current dbb setups vs journal. Hopefully want to keep this one for a while. My goal is 450-500hp.

A little off topic, but is there any issue with running a divided manifold with an undivided turbo?

Thanks

Last edited by bigkahuna2187; 03-03-2017 at 08:50 AM.
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post #2 of 3 (permalink) Old 03-03-2017, 10:54 AM
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As you said it's been discussed many times. In my opinion for your power goals a journal bearing is fine. The ball bearing turbo will spool up about 300-500rpms sooner, but I can't justify spending the extra money just for that.

Also for the bb turbo, you'll need a restrictor on the oil feed so you don't blow out the seals. I'm not against the idea of running a ball bearing, and if you don't mind spending the extra money be my guest.

Now if it's for competition where every amount of power counts, by all means go with the ball bearing. I've seen 1000hp+ Supras with the ball bearing and it's pretty cool that the turbo is still spinning long after the car is shut off.

As for the manifold question, I don't see why it should be a problem. The divided manifold just divides the pulses from the cylinders so they don't interfere with each other. To completely utilize it, you would want to use a twin scroll turbo, but I don't see a problem running it with a regular turbo.
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post #3 of 3 (permalink) Old 03-03-2017, 11:46 AM Thread Starter
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Quote:
Originally Posted by blkaltezza View Post
As you said it's been discussed many times. In my opinion for your power goals a journal bearing is fine. The ball bearing turbo will spool up about 300-500rpms sooner, but I can't justify spending the extra money just for that.

Also for the bb turbo, you'll need a restrictor on the oil feed so you don't blow out the seals. I'm not against the idea of running a ball bearing, and if you don't mind spending the extra money be my guest.

Now if it's for competition where every amount of power counts, by all means go with the ball bearing. I've seen 1000hp+ Supras with the ball bearing and it's pretty cool that the turbo is still spinning long after the car is shut off.

As for the manifold question, I don't see why it should be a problem. The divided manifold just divides the pulses from the cylinders so they don't interfere with each other. To completely utilize it, you would want to use a twin scroll turbo, but I don't see a problem running it with a regular turbo.
Great info as always! Thanks.

-Adam

2004 IS300 MSM 2JZ-GTE VVT-i Single 61mm 5 Speed
2015 Toyota Tacoma TRD Sport LB

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