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Discussion Starter · #1 ·
I have this setup on my '05 QC SRT10 Truck with just larger injectors and a tune, and the factory in tank pump was fine with it. I removed the external puller pumps and the fuel/spark piggy back ECU as it was causing probs.
Now thinking of adding this same setup to the '05 Viper (Same exact GEn3 engine as the trucks). Question is, does the fuel pump need to be upgraded in the Viper for this for only 4-5psi? Truck puts down 570rwhp/565rwtq with this same psi through an automatic trans.
 

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I'd bet it's exactly the same from 03 to 05. Call and ask Paxton, they are helpful usually. You can also call Doug Levin and he would know.
 

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Discussion Starter · #3 ·
I looked up the fuel pump for the SRT10 truck on RockAuto, there are 4 different pumps available for it, the specs say max free flow gph is 90, and max psi is 115. Looked up a pump for the Viper, and it only has 1 brand available and its specs are max gph is 70 and max psi is 65. So there is quite a difference there. Outlet size on both is 3/8", and the pump assemblies look a little different between the two....So I am guessing that upgrading the pump in the Viper is probably not a bad idea.
 

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Discussion Starter · #4 ·
So a little more digging, looks like the stock pump is good only for about 550-600hp. And it appears that the best way to upgrade is to install a GenIV pump assembly as it puts out roughly the same 90-100 gph as what the SRT10 truck pump puts out and is a direct bolt in to the Gen3s. The GenIV pump is a 2-stage pump also, unfortunately its about a $1300-1500 part depending on where ya get it.
 

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WOW $1400 should buy a very nice external fuel pump with braided line and a return style fuel pressure regulator, which would allow tuning based on boost.

Look up aeromotive fuel systems... if your putting on a supercharger you don't need to stay OEM.
 

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Discussion Starter · #6 ·
I have since found the Walbro pump replacement kits rather than the entire OEM assemblies, just not sure what is involved with modding the basket to mount it. External puller pumps are really old school ways of doing it, had that setup on a Grand National many years back, was much more tunable with the right in tank pump. Have an SRT10 Truck that also had the external puller pumps that came with the Paxton setup, they later started causing issues along with the piggy back ECU controller...removed all of that and went with the right size injectors, 2-bar map, and a tune and performs much better now so looking to do the same setup on the car now, just the truck already has a 340lph pump in it so it did not need to be replaced.
 
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