Quote:
Originally posted by tpunx99GSX@Jun 5 2004, 05:00 PM
that actually cleared up a lot for me. What can i expect from this? will it spool my turbo faster, faster acceleration, can i turn the boost up more, will it provide higher top end power... etc?
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nothing. expect consistent fuel delivery. unless you have a walbro 255HP or supra tt pump, having the pump rewired shouldnt overrun your fuel pressure regulator.
having higher voltage at the fuel pump allows it to draw more power and pump a bit more fuel. it is not going to change your fuel pressure or how much fuel is injected, because your fuel pressure regulator will bypass the extra fuel being pumped. if you were using huge amounts of fuel with a big turbo and high boost, then your un-rewired pump (even if it were a bigger pump than stock) may not be able to pump enough fuel to keep the fuel pressure where it should be. on a small turbo with low boost you just rewire the pump so it can provide sufficient fuel to maintain proper fuel pressure at high rpm and high boost.
so, rewire the pump, and preferably replace it with a denso 190lph or walbro 255 (not the 255HP). don't use any switch. when you are at 7000rpm in 4th gear at 20psi with the throttle mashed, your pump will have enough voltage to move enough fuel to keep your fuel pressure at 63psi (43 psi base + 20 psi increase due to the boost you are at). no amount of rewiring or resultant additional pressure will change how much fuel is being injected into the cylinders, unless the amount of additional fuel being pumped exceeds the amount your stock fuel pressure regulator can bypass back to the tank to maintain appropriate pressure levels (ie rewired walbro 255HP or supra tt pump with stock 2g fpr)
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