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Whipple with 43lb injectors

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Old 06-01-2006 | 09:37 PM
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I popped the stock 5.3 at 8 psi with 43 lb injectors. The pump could not keep up. I was however in the 500 rwhp area. Better safe than sorry.
Old 06-01-2006 | 10:11 PM
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If i go with a external walbro gsl392 which is a 255lph pump, i think this will be the easiest to install. Is this the right pump for this upgrade or has anyone used a different external pump. Any help would be great
Old 06-01-2006 | 10:32 PM
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Can i use the inline pump and the tank pump at the same time. I really dont know to much about fuel pumps ect...
Old 06-01-2006 | 10:41 PM
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I hope someone will chime in on this one. thanks
Old 06-01-2006 | 11:00 PM
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Yes you can.
Old 06-02-2006 | 02:08 PM
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only took me 45 minutes to install the in-tank pump that came with my radix, that's on the hoist and off in 45 min,
no big deal to do.
Old 06-02-2006 | 03:47 PM
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Do i need to get a new fuel pressure regulator by adding this 2nd pump? Is the walbro 255lph inline fuel pump a good pick for this mod? Or should i install an in tank fuel pump. Is there any that are a direct fit. Thanks alot guys im lost when it comes to fuel pump like i said. I want to make sure that i get everything for this upgrade.
Old 06-02-2006 | 04:55 PM
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I too am in the same boat. I got a walbro 255lph made for typhoon's/syclone's but am not sure what all will have to be done to modify it correctly. Or, will an inline be better? I have a whipple w/ 6lbs. and I'm installing a new PCM and 43lb injectors.
Old 06-02-2006 | 07:21 PM
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I talked to allen at nelson and he the man that sold me the injectors. He said put them on and put a gauge on it and see what your fuel pressure is. If it is at or above 55psi at WOT you will be fine.
Old 06-19-2006 | 12:58 AM
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Originally Posted by ranwalk
I made 442rwhp with a Whipple on a 6.0 with the stock pump and 42pound injectors
ramwalk, What else did you have done to that truck at the time when you were getting 442rwhp? I just Dynoed mine this weekend and only got 371rwhp.

Oh by the way I have a 2003 6.0L with the Whipple and Diablosports tune.


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