displaying posts 51 to 56 of 56

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Author Subject: Supercharger
24seven

Seasoned Pro

Location: Derby

Registered: 05 Oct 2005

Posts: 6,221

Status: Offline

Post #51
Primarily turbo's are favoured over superchargers for their efficiency. If you imagine all that hot, high speed exhaust gas just disappearing down a pipe. The energy needed to compress the intake air has to come from somewhere, with a turbo it's taken from the exhaust gasses, but with a supercharger it comes straight from the crankshaft via a belt and those gasses just carry on as they were, wasting energy.

I think it's BMW or someone subcontracted by them who have been toying with the idea of steam jackets on the exhaust that drive compressors as well. Anything to recuperate lost energy.

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Posted 15th Mar 2013 at 00:29
stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

Status: Offline

Post #52
eliotrw wrote:
You know they put salt on the roads this week though right? :p


Yes I do, and I'm not overly pleased about it! Angry

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Posted 15th Mar 2013 at 08:14
mabgti

NV motors

Location: Bham tunnel @7400rpm

Registered: 28 Aug 2003

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Post #53
See what happens to a hoover when you put your hand at the end of it.. This is typically what is happening with a draw through system.. it works and i have one.. but no doubt bearing lift and compressor damage is caused by the CAP (butterfly) closing causing stress whilst still spinning at 10,000 rpm!

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Posted 15th Mar 2013 at 14:20
stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

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Post #54
Yeah, it doesn't happen with the system I have on my car which incorporates the use of a dump valve as the butterfly is after the charger as opposed to before it. Wink

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 15th Mar 2013 at 15:09
ballardpaul

Seasoned Pro

Location: Croydon

Registered: 22 Jul 2008

Posts: 4,135

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Post #55
stan_306gti6 wrote:
Yeah, it doesn't happen with the system I have on my car which incorporates the use of a dump valve as the butterfly is after the charger as opposed to before it. Wink


Smile sounds awesome!!!

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Posted 15th Mar 2013 at 20:33
phillipm

Seasoned Pro

Location: Rotherham

Registered: 15 Oct 2006

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Post #56
mabgti wrote:
See what happens to a hoover when you put your hand at the end of it.. This is typically what is happening with a draw through system.. it works and i have one.. but no doubt bearing lift and compressor damage is caused by the CAP (butterfly) closing causing stress whilst still spinning at 10,000 rpm!


You think there's less stress when it's constantly pushing against a closed throttle plate and/or dump valve spring?
Even with a shut throttle it's not pulling a perfect vacuum, so fairly low in terms of stress, even with the torque reversal, the whole idea of the shear drive system is that it can cope with slip on rapid acceleration/deceleration/torque change, it just puts more stress on the fluid.

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Posted 15th Mar 2013 at 21:23

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