Your Internals
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nissanfanatic
- Posts: 1314
- Joined: Mon Nov 01, 2004 8:41 pm
- Car: 1992 Nissan 240sx SE
- Contact:
Quote »and just increase fuel pressure to accomodate extra air entering the engine.[/quote]No. They increase fuel pressure proportional to boost to keep the same amount of fuel entering the engine at a given pulse. The intake manifold is pressurized, so there is 1psi of pressure on fuel entering the manifold. That would lower fuel pressure coming from the rail. The rising rate fuel pressure regulator is basically an equalizer.
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bruinbear714
- Posts: 1159
- Joined: Thu Sep 05, 2002 9:58 pm
- Contact:
Re: (hysteria)
I been running 0.5bar with stock internals for over a year now, and engine still runs great.
Street tuned with emanage & wideband.
Street tuned with emanage & wideband.
Re: (nissanfanatic)
how i understood it was this - 12:1 rrfpr/fmu means that for every 1 psi over atmospheric pressure in the manifold the fuel pressure will be increased by 12 psi (since the fmu reads manifold pressure via a vacuum hose). regular fuel pressure from the stock fuel pressure regulator is ~43 psi. but the fuel pump can't just increase fuel pressure to infinity. fmu's are generally limited by the abilities of the fuel system, and more specifically it is usually the pump that maxes out first (walbros won't even make 100 psi of pressure, if i remember correctly... search google to find out for sure). so going above 8 psi doesn't work well because you can't get any more fuel at 10 or 15 psi than you would at 8 psi because the fuel pump is at its max pressure. there's more stuff but i've written a good deal about it before so just look it up in a search if you're curious.oh and i was talking about pressure inside the fuel lines past the rrfpr.
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TravBear2
- Posts: 65
- Joined: Tue Jan 07, 2003 9:08 am
- Car: 2006 Sentra, Looking for a '93 240 LE In perfect condition
Re: (hysteria)
See im learning. Thats why im hear. So the FMU is strictly mechanical? Ok.
Ok so back to what the post originally was. What all do you have in your cars?
Modified by TravBear2 at 10:47 AM 10/29/2005
Ok so back to what the post originally was. What all do you have in your cars?
Modified by TravBear2 at 10:47 AM 10/29/2005
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TravBear2
- Posts: 65
- Joined: Tue Jan 07, 2003 9:08 am
- Car: 2006 Sentra, Looking for a '93 240 LE In perfect condition
Re: (TravBear2)
No one willing to post what they have?
search around a bit. everyones setup is posted here and there.
turbo kits are turbo kits... i mean all the major stuff is the same - components differ in size, design and such (like turbos manifolds bovs wg's etc). functionally though they are all doing the same thing.the main differences would be in the electronics, or lack thereof in some cases.for fuel management i have an fmu and a stock ecu, with a walbro pump. many people have this setup for low boost.when you want something more than 8 psi you upgrade to electronic fuel controls such as a piggy back system, a stand alone, or a rom tune or daughterboard system. the latter of which can be done by a company or can be a diy thing. the daughterboard setup is becoming more and more popular. i'm going to use this when i want to upgrade.in terms of complexity, and i would say that the relationship between complexity and cost are directly related here's how it goes.stand alone > daughterboard >= piggyback >fmui have yet to see someone prove that the daughterboard setup is far superior to any other, mainly because it's just now getting a lot of support. but in theory it should be almost as good as a stand alone and it costs a fraction of what a stand alone costs (AEM EMS is ~$2000). also it won't have to "trick" the ecu by sending modified values... it reads the right stuff directly from the sensors, just like a stand alone, whereas the piggy back systems have to modify the sensors signals to the ecu... when you upgrade something like the injectors the stock ecu doesn't know it (unless you readjust everything). so the piggyback can help out and trick the ecu into running the way it should with the different injectors.
anyway just search around for more info on this stuff.. it has been covered before many times.
turbo kits are turbo kits... i mean all the major stuff is the same - components differ in size, design and such (like turbos manifolds bovs wg's etc). functionally though they are all doing the same thing.the main differences would be in the electronics, or lack thereof in some cases.for fuel management i have an fmu and a stock ecu, with a walbro pump. many people have this setup for low boost.when you want something more than 8 psi you upgrade to electronic fuel controls such as a piggy back system, a stand alone, or a rom tune or daughterboard system. the latter of which can be done by a company or can be a diy thing. the daughterboard setup is becoming more and more popular. i'm going to use this when i want to upgrade.in terms of complexity, and i would say that the relationship between complexity and cost are directly related here's how it goes.stand alone > daughterboard >= piggyback >fmui have yet to see someone prove that the daughterboard setup is far superior to any other, mainly because it's just now getting a lot of support. but in theory it should be almost as good as a stand alone and it costs a fraction of what a stand alone costs (AEM EMS is ~$2000). also it won't have to "trick" the ecu by sending modified values... it reads the right stuff directly from the sensors, just like a stand alone, whereas the piggy back systems have to modify the sensors signals to the ecu... when you upgrade something like the injectors the stock ecu doesn't know it (unless you readjust everything). so the piggyback can help out and trick the ecu into running the way it should with the different injectors.
anyway just search around for more info on this stuff.. it has been covered before many times.
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SlIp'n'sLiDe
- Posts: 56
- Joined: Fri Apr 29, 2005 8:24 am
- Car: 240
hey fiz...im planning on rinning 350-400 daily...lol but i think i got this figured out now, and i got my motor parts ordered and i am extremely excited to get my uras exhaust, but i will def keep u guys updated on my ka-t progress, keep ur fingers crossed i am hoping to get this done by the end of winter. and i will take 1000's of pics as soon as i get this project under way and make a nice thread and all of my stories while doing this.