06-28-2014, 08:12 PM
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#1 (permalink)
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A True Z Fanatic
Join Date: Mar 2009
Location: Chicago
Posts: 3,669
Drives: 370
Rep Power: 974724
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Quote:
Originally Posted by Jordo!
Boost pressure fights fuel pressure -- so long as AFR's are maintained, the pressure may drop, but it would technically be sufficient.
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Pressure drop is a sign of approaching the limit. The limit will shift around based on environmental conditions, system voltage, filter condition, etc. So if you find yourself at the limit of your fuel system, for the sake of consistency, its a good idea to upgrade and protect your engine.
Quote:
Originally Posted by Jordo!
I thought switching to a return system brought with it a whole host of potential running and tuning issues (including possible vapor lock) under all circumstances except high load and high boost -- maybe I'm mistaken?
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There are generally no problems, if its built and installed correctly.
Quote:
Originally Posted by Jordo!
It all depends on how much more fuel you need to maintain the same torque levels. If you need, say, 20% more fuel, you need 20%+ more pump. Sounds like the OEM pump will be struggling with that.
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That is not exactly how it works. If you need 20% more fuel, but your pump is large enough to supply it already, than you dont need 20% more pump. There are just limited samples of anyone even bothering experimenting with the stock pump to get a solid idea of how much fuel its moving.
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