just dyno'd precision 6262 .84 on a ported engine
#78
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I am sorry but is not true, you can take a little material off of it. It's not going to hurt, but your can't take more than maybe .40 - .50 thousands off. Look at a full race manifold and you will see where they surfaced the wastegate flanges.
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#83
the real-world application of journal bearing vs BB (same turbo otherwise) is that it's not much of a difference. for autocross or road racing where you need the off-throttle to full-throttle punch response, i could see where people may want to pay the money for it.
personally, i decided to pay 979$ for my precision journal bearing instead of paying $1529 for BB. the 1/4 second better response is not worth $550 to me, and that money was used to purchase two wastegates instead
personally, i decided to pay 979$ for my precision journal bearing instead of paying $1529 for BB. the 1/4 second better response is not worth $550 to me, and that money was used to purchase two wastegates instead
#85
the real-world application of journal bearing vs BB (same turbo otherwise) is that it's not much of a difference. for autocross or road racing where you need the off-throttle to full-throttle punch response, i could see where people may want to pay the money for it.
personally, i decided to pay 979$ for my precision journal bearing instead of paying $1529 for BB. the 1/4 second better response is not worth $550 to me, and that money was used to purchase two wastegates instead
personally, i decided to pay 979$ for my precision journal bearing instead of paying $1529 for BB. the 1/4 second better response is not worth $550 to me, and that money was used to purchase two wastegates instead
Initially when I bought the jb turbo I was worried about lag. In comparison to a 500r which I have felt prior, I must say the difference in spool time is not really noticeable. A lot of people look at my crooked when I say I have a jb turbo. I guess people are stuck in the old times where most non bb turbos (such as the T04R) were pretty laggy.
I agree with you, even if I had to money to spare, I would keep the $550 difference and put it toward something else. The rebuild price is also much cheaper for jb turbos.
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Very interesting thread.
I had a similar problem with a 6262 but I resolved it by going to a 50mm wastegate. Granted this was on a piston engine but I also put down 734whp @ 40psi. Oh yeah, lol the turbo kit was designed to be efficient up to 600hp, so the manifold flow and wastegate both played an issue.
Looking to transfer it to my rx7 one day and run a dual wastegate manifold in hopes for 350-400hp for auto cross use.
From this thread, and many others discussing manifolds, Turblown, full-race, a-spec, and a couple custom manifolds on here, all have the basics covered - dual wastegates, great flow, good turbo/wastegate position.
Interested to hear the figures once your issues are sorted.
I had a similar problem with a 6262 but I resolved it by going to a 50mm wastegate. Granted this was on a piston engine but I also put down 734whp @ 40psi. Oh yeah, lol the turbo kit was designed to be efficient up to 600hp, so the manifold flow and wastegate both played an issue.
Looking to transfer it to my rx7 one day and run a dual wastegate manifold in hopes for 350-400hp for auto cross use.
From this thread, and many others discussing manifolds, Turblown, full-race, a-spec, and a couple custom manifolds on here, all have the basics covered - dual wastegates, great flow, good turbo/wastegate position.
Interested to hear the figures once your issues are sorted.
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