Maximum output of stock EJ22 Turbocharger and...
Posted: Tue Sep 03, 2002 12:53 pm
Please AVOID reading and listening to recommendations like these...it really shows inexperience.
1. Stock Legacy fuel pump is the same as was offered in Japan; If memory serves me right, it is also the same pump as a 2002 WRX uses (133 lph). In other words....it is MORE than enough for what most of us will do to the cars. Will an upgraded one, like a Walbro 255 lph or Denso unit (froma Supra Twin Turbo) or an FD RX7 (210 lph) help? Sure, but then you NEED some sort of fuel controller (SAFC, SAFR, etc.) to dial it all back in.
2.The hood scoop is a good idea, I agree...essentia? Far from it IMHO. Again, adding ANY IC to a car that never had it helps.....the fact that we already have a hood scoop also helps.....if you are handy with body work, or don't mind the time invoived in fitting a custom scoop, by all means....I won't be doing it though, as I just don't see the reward being worth anywhere near the effort.
3. DO NOT ADD THIS KIND OF FUEL PRESSURE REGULATOR!!~!!!!!!!! The car has a rising rate regulator from the factory.,.it rises at the rate of 1:1, meaning it receives a vacuum signal, and for every positive psi of pressure it sees, it raises fuel pressure by 1 psi over the base setting at idle (which should be from 32-38 with the vacuum hose off the regulator. The stock FPR can handle about 60 psi, which is more than enough for what we'll be running (in other words, it can handle enough fuel presure for 22-28 psi of boost, depending upon whwere your base pressure at idle is. The true limits of the stock regualtor are in it's bypass capabilities. If you do a fuel pump mod, and then find your base pressure at idle increased, then you are over taxing your stock regulator (it cannot bypass enough fuel). At that point, you want an adjustable fuel pressure regulator (again, stick with 1:1, more on that in a minute), and make sure you can adjust it back DOWN to 32-28 psi with teh vacuum
As for the ratio the regulator should be, you ONLY want a 1:1 unit. The stock cu is meant to cope with a 1:1 ratio...go higher, it freaks out, pulls timing, etc. Does a 2:1 or higher work? Sure does....when going from NA to forced induction, where you need the higher pressure to compensate for small fuel injectors that were never designed to see positive manifold pressure.
Bill - I don't mean to come across as crass or anything, but I think the reason you experienced what you did was that your stock pump was just tired.....it happens all the time. Just don't want to see some of the less experienced guys running out an spending money on stuff that is not only non-esential, but wrong for our cars
Adam
Z-1 Performance
1. Stock Legacy fuel pump is the same as was offered in Japan; If memory serves me right, it is also the same pump as a 2002 WRX uses (133 lph). In other words....it is MORE than enough for what most of us will do to the cars. Will an upgraded one, like a Walbro 255 lph or Denso unit (froma Supra Twin Turbo) or an FD RX7 (210 lph) help? Sure, but then you NEED some sort of fuel controller (SAFC, SAFR, etc.) to dial it all back in.
2.The hood scoop is a good idea, I agree...essentia? Far from it IMHO. Again, adding ANY IC to a car that never had it helps.....the fact that we already have a hood scoop also helps.....if you are handy with body work, or don't mind the time invoived in fitting a custom scoop, by all means....I won't be doing it though, as I just don't see the reward being worth anywhere near the effort.
3. DO NOT ADD THIS KIND OF FUEL PRESSURE REGULATOR!!~!!!!!!!! The car has a rising rate regulator from the factory.,.it rises at the rate of 1:1, meaning it receives a vacuum signal, and for every positive psi of pressure it sees, it raises fuel pressure by 1 psi over the base setting at idle (which should be from 32-38 with the vacuum hose off the regulator. The stock FPR can handle about 60 psi, which is more than enough for what we'll be running (in other words, it can handle enough fuel presure for 22-28 psi of boost, depending upon whwere your base pressure at idle is. The true limits of the stock regualtor are in it's bypass capabilities. If you do a fuel pump mod, and then find your base pressure at idle increased, then you are over taxing your stock regulator (it cannot bypass enough fuel). At that point, you want an adjustable fuel pressure regulator (again, stick with 1:1, more on that in a minute), and make sure you can adjust it back DOWN to 32-28 psi with teh vacuum
As for the ratio the regulator should be, you ONLY want a 1:1 unit. The stock cu is meant to cope with a 1:1 ratio...go higher, it freaks out, pulls timing, etc. Does a 2:1 or higher work? Sure does....when going from NA to forced induction, where you need the higher pressure to compensate for small fuel injectors that were never designed to see positive manifold pressure.
Bill - I don't mean to come across as crass or anything, but I think the reason you experienced what you did was that your stock pump was just tired.....it happens all the time. Just don't want to see some of the less experienced guys running out an spending money on stuff that is not only non-esential, but wrong for our cars
Adam
Z-1 Performance