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Fuel pump question?

Old Jun 17, 2004 | 09:27 AM
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Default Fuel pump question?

Im about to have my car Dyno tuned... My question is should I replace the stock fuel pump before I go? My mods are in my Sig... keep in mind after A couple of N/A pulls I will be spraying a 100 & 125 shot.. I thinking I should be close to 390 - 400 all motor, 490-500 on the juice.. I've read the stock fuel pump is good to about 450-47-.. Would it be a good idea to install a walbro 255 before I go?
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Old Jun 17, 2004 | 09:40 AM
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You NEED bigger injectors before you spray on that combo, or you're going to tear some stuff up. And I don't mean that in a good way.

You might be able to get away with a stock fuel pump, but there's no guarantee's.
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Old Jun 17, 2004 | 09:50 AM
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Bigger injectors, or Bigger injectors & fuel pump? What size injectors?
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Old Jun 17, 2004 | 10:01 AM
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You would be wise to do both, IMO.

I'd probably go with some SVO 36lb injectors if I were you. Keep in mind you'll need to have the PCM tuned for them as well, which can be done by scaling the IFR table.
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Old Jun 17, 2004 | 10:14 AM
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Ok.. Thats what I thought, Just wanted to make sure..
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Old Jun 17, 2004 | 10:24 AM
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BTW this is a dry kit, It doesnt mix fuel with it. It goes straight through the intake.. Does that still matter?
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Old Jun 17, 2004 | 10:35 AM
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Yes it does. That's why you HAVE to get the bigger injectors.

The dry kit sprays through the MAF wires, telling the computer to add more fuel. It adds fuel by commanding the injectors to spray more fuel, which they can only do to a certain extent. When they can't spray anymore, your motor leans out and things break.

I would really recommend you do some reading on this stuff before you get to crazy with the juice. Power adders are a costly thing to do your learning on the hard way.
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