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10-27-2005, 04:43 AM
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#1 |
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Junior Member
Account #: 13806
Join Date: Dec 2000
Posts: 1,046
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Stupid question about boost on the S4...
Talking with a friend that picked up a nice B5 S4 a little while ago made me think of something. Let me know if my reasoning is out of whack or if I'm actually right. If the intake manifold is seeing 1 bar of boost, and since the engine is a twin turbo, then each turbo is only producing 1/2 bar of boost. Yes, No??
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10-27-2005, 04:50 AM
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#2 |
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Elder Member
Account #: 2021
Join Date: Mar 2000
Posts: 12,485
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If you had 2 tanks. Each at 100psi and both connected to a y-valve
you put a pressure gauge downstream of the y-valve and open the tanks are you going to see 200 psi? No. where would the extra pressure come from? Same as the car.
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 +  +  = 451whp/472 ft-lbFull RS6 bastardized allroad quattro alive and on the road. |
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10-27-2005, 04:52 AM
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#3 |
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AudiWorld Senior Member
Account #: 78752
Join Date: Jul 2004
Posts: 1,336
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I believe that the pressure between the turbos thru the intercoolers and to the intake mani
should be almost the same.
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   Not quite stock... Track addict... My new toy: Cayman S My last track event: Watkins Glen 10-08 Next track event: NJMP April 09 Winter driving school NEQ club and ACNA Canadian chapter. 2-07> Pictures from VIR 4 08 with PCC ACNA> VandyS4's FAQ for n00bs> Gone but not forgotten: 91 GTI 16V Montana Green |
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10-27-2005, 04:52 AM
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#4 |
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Elder Member
Account #: 26545
Join Date: Oct 2001
Posts: 32,087
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hmm, dual throttle bodies would solve that, no?
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10-27-2005, 05:02 AM
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#5 |
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Elder Member
Account #: 2021
Join Date: Mar 2000
Posts: 12,485
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?? Doesn't matter how many throttle bodies you have. Boost won't be multiplied.
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+ + = 451whp/472 ft-lbFull RS6 bastardized allroad quattro alive and on the road. |
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10-27-2005, 05:07 AM
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#6 |
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Member
Account #: 42392
Join Date: Sep 2002
Posts: 14,595
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Only if you double the volume of the single.
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00 S4, Euro spider hose mod!!  04 allroad, needs rs6 intercoolers, k04s and a cargo box... 
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10-27-2005, 05:14 AM
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#7 |
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Member
Account #: 72863
Join Date: Mar 2004
Posts: 2,953
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The turbos split the volume required to make 1 bar 'o boost, not the pressure.
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