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Fuel pump question?

Discussion in 'SVT Shelby GT500' started by toennee, May 13, 2018.

  1. toennee

    toennee Member Established Member

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    I have an 08 GT500 with the following mods: 2.6 upper pulley, 15% lower pulley, 65mm TB, ported M122 and inlet, 56lb injectors, JLT cold air intake, 14 intercooler, long tube headers, hi flow catted xpipe, and magnaflo axle back.

    I just added the lower pulley, TB, and ported SC. After I drove it and data logged, finding my fuel pump is maxed out without even getting on it hard.

    I am looking at my options: BAP or swapping out pumps in the tank. Can anyone tell me what the factory pumps are rated at?

    I have to do something before driving it anymore but this is a budget build and am looking for the best value.
     
  2. Willie

    Willie Well-Known Member Established Member

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    How much boost and what is your maximum Load?
    I have recent experience with this topic. I've never liked the idea of a BAP and planned on replacing the pumps. But further research yielded an unbelievable fact. Only one company came up with a true, high volume bolt-on replacement, BUT I also read about issues with reliability of these pumps. The only other way to increase volume without a BAP is to go with a return system. So, I decided to go the BAP route. The two primary contenders are KB and JMS. Here are some facts about both. You make your own decision...>>

    KB
    Offers a 17 and a 21-volt dual pump BAP.
    It is turned on via a Hobbs switch. You can choose the boost level at which to activate.
    Basically, these units are either off or on.

    JMS
    Offers one unit that is programmable, via built-in DIP switches.
    Choose between 18 and 22 volts.
    Choose to activate it by 1) Grounding it, 2) Hobbs switch, 3) 0-5 volt trigger, i.e. MAF or MAP.
    Voltage can be ramped up upon activation, 1) 0.4 v, 2) 0.8 v, or 3) 1.2v. (and ramped down also.) Doing this prevents fuel pressure spikes.

    Pricing between these is comparable.
    Guess which I chose?

    According to the literature I received in my SCT tuning class, the stock GT500 pumps are good for 600 rwhp. With a BAP, 850 rwhp... AND NO TUNING IS REQUIRED..
     
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  3. HillbillyHotRod

    HillbillyHotRod Hooligan rabble rouser Established Member

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    There is also VMP which I am running in my 08. Af far as I can tell they are not user programmable but I have been happy with them at 704 rwhp.
     
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  4. RBB

    RBB Well-Known Member Established Member

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    I had good luck with a VMP BAP for about 3 years. It’s definitely the most economical way to do it, and VMP’s unit is an extremely easy PnP install. I’ve since moved on to a full return style system since some further modding put me over the edge of what stock pumps and a BAP can handle.
     
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  5. toennee

    toennee Member Established Member

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    Good information and I have been leaning toward replacing the pumps in the fuel hat with 265 or 340 pumps. Not sure what my boost is exactly but on my test drive the factory guage would hit 15 psi. Maybe I will get lucky and someone will be upgrading and have a used BAP at a good price.
     
  6. toennee

    toennee Member Established Member

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    I am looking into the VMP now. Thanks
     
  7. Willie

    Willie Well-Known Member Established Member

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    Ahhh yes, forgot about VMP. Probably because I've never done business with them, doh.... Anyways, the VMP unit is a 100 percent ON. It supplies full voltage to the pumps from the time you crack the key... but it is the cheapest..

    Willie
     
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  8. Willie

    Willie Well-Known Member Established Member

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    And if you decide to go with pump replacement, tuning IS required, and it involves many steps, including a remote tuning session.... unless you tune yourself, of course. I know the method and it sucks!

    If you decide on a BAP, there's no "right" choice. All brands and methods are good. It's just a matter of personal preference.... blonde, brunette or the 100 percent always ON redhead...!

    Willie
     
    Last edited: May 13, 2018
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  9. toennee

    toennee Member Established Member

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    You found my weakness "REDHEADS"
     
  10. fullboogie

    fullboogie Well-Known Member Established Member

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    I don't think anyone uses the hobbs switch on the KB. It's wired direct and the tune compensates.
     
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  11. Totalpkg

    Totalpkg Active Member Established Member

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    I went with a JMS which is a little more involved for the 2011-2012 cars. I like that I can go to 22v or 18v.
     
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  12. JBN

    JBN Le Chupacobra Established Member

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    I went the route of replacement pumps. I’m running 2 of aeromotives 325 pumps in the stock fuel hat. They have been in my car almost 3 years now and have around 25-30k miles driven with them. I haven’t done any logs with them since the original install, but at the time I had room to grow with them and the 72lb injectors I’m running. I have a set of id1000’s I’m waiting to install and will continue to use the same fuel pumps as I have had no issues with them.
     
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  13. svts197jag

    svts197jag boostang Established Member

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    Whats your HP with the aeromotive 325? What's involved on the installation?

    Sent from my [device_name] using the svtperformance.com mobile app
     
  14. toennee

    toennee Member Established Member

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    I think I am leaning toward replacing the pumps unless I find a deal on a BAP.
     
  15. toennee

    toennee Member Established Member

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    So I found a good deal on the DeatschWerks kit with 340 LPH pumps and went and ordered it. I will let everyone know how it turns out. Thanks for all the advice.
     
  16. Willie

    Willie Well-Known Member Established Member

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    I'm curious how these pumps perform...

    So now you will have to modify your fuel pump voltage table. I have a written procedure, including datalogging... hit me up if you need this info... but most tuners should know how to go about this...

    Willie
     
  17. JBN

    JBN Le Chupacobra Established Member

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    At this point I’m not sure. Car made 630 with the stock tvs pulley. I’ve since changed to a bps 2.398 and a lethal x pipe. Not wanting to sound like “dyno racer”, but best estimate would be 650-675 to the wheels. No track times to back anything up as my second pass late last season I lost my clutch. Next track session I’ll have long tubes and matching off road h pipe and a handful of other things done.

    Installation is very simple. I ordered 2 aeromotive pumps from amazon. Pumped arrived and had no pig tails. Called aeromotive and they sent me 2 pig tails free of charge. Removed stock hat/pumps. Removed stock pumps from hat. Installed new pumps in their place. Cut factory pig tails off and spliced in new aremotive pig tails. I do remember having to trim some plastic from near the top of the pump as it was hitting something. Nothing major, just used a sharp pair of dykes to trim it. Memory is a little foggy but I don’t believe I spent maybe a little over an hour in the whole process.

    Vmp had done the tune for me at the time. 2-3 datalogs later and I’m where I’m at now.
     
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  18. JBN

    JBN Le Chupacobra Established Member

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    Looking forward to seeing your results
     
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  19. svts197jag

    svts197jag boostang Established Member

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    Ok thanks for the info!!

    Sent from my [device_name] using the svtperformance.com mobile app
     
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  20. toennee

    toennee Member Established Member

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    I wish I was able to tune for myself. For now I am using Tunes for Life from BAMA. I have a few more things I want to do to my car and once I have everything done I hope to take it to Pro Dyno and have them do some magic.
     
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