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post #1 of 7 Old 8th March 2019, 12:10 AM Thread Starter
Angrydog
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Supercharged power

Just wondering, why is it that the E39 M5 when supercharged without an intercooler can return 650bhp, an e9x can return 625bhp but the e6x M5 only makes 635bhp, all using the base ESS kit?
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post #2 of 7 Old 8th March 2019, 12:57 AM
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I don't have a definitive answer for you, though spit balling, the S85/S65 are high compression motors 12.0.1. The S62 in the e39 M5 runs lower with 11.0.1.


To make big reliable forced induction power you need to drop compression which takes some extra steps and tuning compared to strapping on a base supercharger kit.


You can run more effective boost with the lower compression ratio, I'd wager that is a large contributing factor. Perhaps also different drivetrain losses between platforms?


It is a shame that you need to spend big money to make a considerable amount of more power with these cars. BMW didn't leave a whole lot left on the table while keeping it N/A and emissions compliant.
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post #3 of 7 Old 12th March 2019, 05:13 AM
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Check your numbers. The ESS VT1 level kit makes 550HP on the S65, 560HP on the S62, and 635HP on the S85.
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post #4 of 7 Old 12th March 2019, 08:04 AM
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post #5 of 7 Old 12th March 2019, 12:23 PM
TheShafro
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Lol a base E39 M5 ESS kit does NOT return 650bhp

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post #6 of 7 Old 12th March 2019, 10:25 PM Thread Starter
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Quote:
Originally Posted by TheShafro View Post
Lol a base E39 M5 ESS kit does NOT return 650bhp
There are owners in the UK claiming such power with no intercooling. Even with meth I would be surprised to see one that high.
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post #7 of 7 Old 13th March 2019, 04:24 AM
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Quote:
Originally Posted by Angrydog View Post
There are owners in the UK claiming such power with no intercooling. Even with meth I would be surprised to see one that high.
The power is possible with modifications, I'm pretty sure I know who you're talking to, but their kits are nowhere near "base".

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