01-18-2018, 11:41 AM | #223 |
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I don't know all the intricacies of tuning these things, but if it isn't too technical, why would you need to have boost different from one bank to another? Wouldn't you want both turbos to be doing the same thing at the same time? Why have separate controls?
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01-18-2018, 11:53 AM | #224 |
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I can only imagine because not all cylinders have the same compression/leak down numbers....
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01-18-2018, 12:08 PM | #225 |
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If there's a large discrepancy in the four cylinders fed by one turbo, wouldn't you want to fix the difference, not tune the turbo? That's more of a build problem, not a tuning problem I'd think.
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01-18-2018, 12:31 PM | #226 |
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This, plus interested to hear what else is different. Emailed them, will see what i get back.
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01-18-2018, 02:12 PM | #227 |
F10 1/4 WR: 9.9s / 142.5mph 1/2 WR: 175.5mph
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Even a stock car can have 1-3psi delta between banks. You can adjust via the WG arm or do it electronically.
Dual bank control allows both banks to have the same boost. On the s63tu the design is cross-bank so both sides feed a turbo at the turbine but compressor feeds one bank at the intake. Best performance is achieved when both are equal. |
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01-18-2018, 02:49 PM | #228 | |
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Quote:
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01-18-2018, 05:07 PM | #229 | |
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Do later versions of the s63tu have an electronically controlled waste gate? Did BMW have better control of output psi on those motors? |
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01-18-2018, 07:39 PM | #230 | |
F10 1/4 WR: 9.9s / 142.5mph 1/2 WR: 175.5mph
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The issue starts manifesting itself on cars with upgraded turbos where the factory DME can't quite handle the characteristics of the turbo (at least no toooner has been able to do it... I am sure it is possible). |
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01-19-2018, 03:12 AM | #231 |
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Is this mainly beneficial to full on turbo swaps or hybrids too?
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F10 M5 2013 Sakhir
Eventuri Intakes, Supersprint backboxes, catless downpipes, ssp spec r, ECU flash, JB4 BCM and BMS dual CM10 meth Insta: Tommy_turb0 |
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01-19-2018, 08:51 AM | #232 |
F10 1/4 WR: 9.9s / 142.5mph 1/2 WR: 175.5mph
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01-22-2018, 07:15 PM | #233 |
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01-22-2018, 07:41 PM | #234 |
F10 1/4 WR: 9.9s / 142.5mph 1/2 WR: 175.5mph
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It’s less hardware since you no longer need that BCM box. The boost solenoid harness comes out directly from the JB4 unit.
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01-22-2018, 07:47 PM | #235 | |
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01-26-2018, 01:57 PM | #236 |
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01-26-2018, 06:23 PM | #241 |
F10 1/4 WR: 9.9s / 142.5mph 1/2 WR: 175.5mph
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