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What PSI are moderate Coupes running ? #1639608
04/03/2020 14:23
04/03/2020 14:23
Joined: Dec 2005
Posts: 722
State of Essex .
robcoupe20vt Offline OP
Enjoying the ride
robcoupe20vt  Offline OP
Enjoying the ride

Joined: Dec 2005
Posts: 722
State of Essex .
What turbo PSI are moderate to heavily modified Coupes running on the road . I am thinking around 22psi would that be correct The reason i ask i was reading an article on the new Mercedes A45 amg M139 engine which is apparently is the most powerfull 2 litre standard production road going engine ever . 208 bhp per litre and running a standard 31 psi ?At 31PSI there must be room to go even higher Sound very high for a petrol road going engine and its amazing how engineering has moved on in the last 25 years . I remember back in the late 80s and early 90s the Cosworth Sierras in BTCC were runnung 36psi .In the beginning with that much boost the heads were lifting I know other engines run higher boost but i am talking about road based engines

Last edited by robcoupe20vt; 04/03/2020 14:25.

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Re: What PSI are moderate Coupes running ? [Re: robcoupe20vt] #1639627
04/03/2020 21:12
04/03/2020 21:12
Joined: Oct 2008
Posts: 6,706
In the coupe.
magooagain Offline
Club Member 259
magooagain  Offline
Club Member 259
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Joined: Oct 2008
Posts: 6,706
In the coupe.
I'm running low boost at 1.15 bar and a max of 1.35 bar. FC performance hybrid turbo. Boost settings are set at very safe. As its thrashed continuously.



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Re: What PSI are moderate Coupes running ? [Re: robcoupe20vt] #1639661
06/03/2020 14:07
06/03/2020 14:07
Joined: Dec 2005
Posts: 17,228
Staffordshire
Nigel Offline
Club Member 123
Nigel  Offline
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Joined: Dec 2005
Posts: 17,228
Staffordshire
I run up to 1.6 bar (23.5 psi) - this gives somewhere around 450-480 bhp, or 225 to 240 bhp per litre.


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Re: What PSI are moderate Coupes running ? [Re: Nigel] #1639751
10/03/2020 00:35
10/03/2020 00:35
Joined: Dec 2005
Posts: 19,929
North wales
pinin_prestatyn Offline
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pinin_prestatyn  Offline
Forum veteran

Joined: Dec 2005
Posts: 19,929
North wales
Not really related to coupes but my MK5 GTI can see 1.5 bar spike then down to 1.3 bar of boost. It’s down to less than a bar by 5k rpm as the turbo is quite small. This kind of boost would worry me when I had the coupe but is entirely normal for a stage two Golf. Maybe the boost pressures are getting higher as cars get more modern. Well until we all drive a big battery that is!



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