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· That One Guy
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Discussion Starter · #1 ·
Does anyone know what the trims are on the BD Supermax and are they considered a 2.5 turbo? I would like to go to a 2.6 turbo but our pulling group up here only has a 2.5 class for now and maybe next year they will go to a 2.6 then I will upgrade if and when the class goes up.
 

· Its just a worktruck
19 Sierra
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15,991 Posts
I'm pretty sure its a 2.6. Its based off the BW s300.
If you're going to do a turbo for pulling, I think you can get a T4 s400 74mm with an s300 cover.
 

· That One Guy
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8,051 Posts
Discussion Starter · #4 ·
I'm pretty sure its a 2.6. Its based off the BW s300.
If you're going to do a turbo for pulling, I think you can get a T4 s400 74mm with an s300 cover.
Really I though they where like a 2.5 or a 2.55? For some odd reason I thought they where under a 2.6.
 

· Vendor
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3,557 Posts
I believe its a 2.6.

You could go with an S464 and upgrade the compressor wheel in the future, I'm pretty sure the compressor cover on the s300's won't fit the s400's and there is no need to.
 

· Its just a worktruck
19 Sierra
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15,991 Posts
S464 thats it Scott. Thanks. IDK why I wrote 74? I thought there was a different cover for the 464?
 

· Vendor
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I'm not sure about a different compressor cover, although I know its machined differently for the smaller 64mm wheel. The T4 S400's have a 4" v-band exhaust outlet instead of 5", I believe that's the only difference. The .90 and 1.0 ar exhaust housings are T4 and the 1.1 is T6.

The S464 flows quite a bit for a 2.5, something like 80lbs/min vs the IHI at 55lbs/min.
 

· Premium Member
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Whats the rule on your guy's 2.5 rule?
 

· That One Guy
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Discussion Starter · #9 ·
Aftermarket turbochargers are acceptable as long as the inducer bore is 2.5 inches or less. The inducer bore on the compressor housing may be no larger than 2.5 inches measured at the smallest diameter area of the compressor wheel. A bushing may be used to downsize the compressor housing ahead of the wheel. If a bushing is used, it must be round, at least 3/4 inch long, mounted within 0.050 inch of the compressor wheel, and the inside diameter of the bushing may not exceed the 2.5 inch limit. The inlet will be measured using a 2.55 inch plug.
 

· That One Guy
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Discussion Starter · #10 ·
They must have made some rule changes since last year because last year you couldn't have a bushed down turbo.
 
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