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max safe boost?

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Old Feb 27, 2004 | 09:26 AM
  #1  
imsonastie's Avatar
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From: fl
max safe boost?

i know this prolly has been discust many times but i havent found a clear answer in my research..
what is the safest max boost the stock injecters can handle?
what is the safest max boost new injectors can handle?
what is the safest max boost the stock turbo can handle with the new injecters?
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Old Feb 27, 2004 | 09:49 AM
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From: fall river ma
id say 22 psi on stock injectors is the max
new injectors u can boost as high as your setup allows u
i think the stock turbo runs out of efficency at like 25 psi
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Old Feb 27, 2004 | 10:30 AM
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20psi should maximum on pump gas(to avoid detonation), anyways are you planning to run race gas!
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Old Feb 27, 2004 | 10:40 AM
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From: Princeton, NJ
i'm even trying to avoid hitting 20psi unless i have an intercooler upgrade or a cooler spark plug... 19.5 and im good hehe
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Old Feb 27, 2004 | 11:28 AM
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From: DE
42.5 PSI

https://www.evolutionm.net/forums/sh...threadid=65483
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Old Feb 27, 2004 | 11:46 AM
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From: fl
well i just installed my mbc and it peaks at 21 then tapers to 19.. should i be ok?
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Old Feb 27, 2004 | 11:58 AM
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From: FQ Story, Phoenix
Originally posted by MrBonus
42.5 PSI

https://www.evolutionm.net/forums/sh...threadid=65483
,

With Dynofalsh, 19.5 max is what Al says...

Winston
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Old Feb 27, 2004 | 12:33 PM
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The EVO on 92-94 octane fuel seems to handle 19-20 psi with no problems at all clear to redline.

Regardless of the injector size and turbo size (basically) the limiting factor of running more boost is fuel octane. A more efficient turbo will let you sneak by with more as the air stays cooler for the same given boost level not to mention the exhaust getting out of the combustion chamber quicker through a bigger turbine. In the end you are still going to be limited by the fuel you run more than anything else.

With the BR475 on our EVO and the AEM w/1,000 cc injectors we still could only run about 21 psi on 94 octane. Good enough for a very quick spooling 401 whp though.

David Buschur
www.buschurracing.com
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Old Feb 27, 2004 | 01:02 PM
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From: Gilbert, AZ
Al tuned my car to 20.5psi
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Old Feb 27, 2004 | 04:46 PM
  #10  
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From: fl
Originally posted by davidbuschur
The EVO on 92-94 octane fuel seems to handle 19-20 psi with no problems at all clear to redline.

Regardless of the injector size and turbo size (basically) the limiting factor of running more boost is fuel octane. A more efficient turbo will let you sneak by with more as the air stays cooler for the same given boost level not to mention the exhaust getting out of the combustion chamber quicker through a bigger turbine. In the end you are still going to be limited by the fuel you run more than anything else.

With the BR475 on our EVO and the AEM w/1,000 cc injectors we still could only run about 21 psi on 94 octane. Good enough for a very quick spooling 401 whp though.

David Buschur
www.buschurracing.com
so what would be a good injector size lets say if i purchase all 4 stages and your kit? because thats what im thinking of doin real soon. and is tht 401whp with your staged setup or just the new turbo/manifold on an evo with new injectors/fuel pump and such.
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Old Feb 27, 2004 | 05:20 PM
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From: NYC/NNJ
you'll probably wanna run 720's with stage 4 and walbro 255
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