Back when I was building turbo Porsches, we ran into some issues with fuel pump capacity limitations. The key is to make sure you have enough fuel system capability to supply the kit it's necessary fuel at it's necessary pressure. If you are running more than factory boost or an upgrade blower, then it's already using some of the "reserve" of the fuel system. Really it's not even the system so much that you're concerned about. It's the pump. When we bolt on larger turbos and such we spend a lot of time focusing on injector size/flow rate etc. These things don't affect the nitrous situation at all because it uses it's own injectors (so to speak). However there is one EXCEPTION to this statement and it comes down to assessing the extent to which we've tapped the additional resources of the factory fuel pump. At some point, the pump will need more capacity to maintain the correct pressure and that line varies with every turbo car combination. Everything from your boost pressure to your turbo size and efficiency map will affect the point at which this line will be crossed. The same principles apply to the normally aspirated cars it's just much harder/expensive to make any substantial tap of the fuel system because the amount of fuel necessary to complement a ram air system or even a good set of cylinder heads is nowhere near as large as the additional fuel necessary for a car that boosted 9PSI with a T-25 to boost 25PSI with a GT3071.

So...having gone through all of that, the biggest thing is to make sure that your pump can flow the amount of fuel necessary for the combined requirements of your turbo/PSI and NOS in gallons per hour or liters per hour against fuel rail PSI. If it's got the capacity, you're good to go.

posted by 68.46.234...

• sometime a picture is worth a thousand words :-), jak , Tue, 31 Jul 2007 17:08:46
  • MMMmmmmm, SAABOOST, Wed, 1 Aug 2007 05:15:42
    • Re: MMMmmmmm, jak , Wed, 1 Aug 2007 06:36:56
      • Good luck man., SAABOOST, Wed, 1 Aug 2007 11:51:43
      • Re: MMMmmmmm, John Williams , Wed, 1 Aug 2007 10:33:20
      • If that kit is from Nitrous Express..., David, Wed, 1 Aug 2007 09:12:29
        • its a cold fusion kit & we will see, jak , Wed, 1 Aug 2007 14:12:59
          • Re: its a cold fusion kit & we will see, David, Wed, 1 Aug 2007 19:23:09
            • I think the speedparts car runs a 2 stage kit, jak , Wed, 1 Aug 2007 21:17:36
              • Re: I think the speedparts car runs a 2 stage kit, David, Thu, 2 Aug 2007 05:01:15
                • Oh it can take the stress..., Chad, Thu, 2 Aug 2007 08:20:17
                  • Re: Oh it can take the stress..., David, Thu, 2 Aug 2007 08:38:27
                    • yeah I have a purge solonoid, jak , Thu, 2 Aug 2007 09:54:53
                      • Excellent call JAK...n/m, David, Thu, 2 Aug 2007 10:06:15
                    • Re: Oh it can take the stress..., David, Thu, 2 Aug 2007 08:44:18
                      • Re: Oh it can take the stress..., Chad, Thu, 2 Aug 2007 08:58:47
                        • There a few things to be aware of..., David, Thu, 2 Aug 2007 09:54:00 <-- Viewing This Message
                          • 2 walboro 255s :-) that ought to get it done...., jak , Thu, 2 Aug 2007 13:38:59
                            • actually this is how it is for now.... on the fueling, jak , Thu, 2 Aug 2007 13:45:23
                              • Re: actually this is how it is for now.... on the fueling, David, Thu, 2 Aug 2007 13:48:21
                                • thanks man :-), jak , Fri, 3 Aug 2007 15:58:29
                          • Re: There a few things to be aware of..., John Williams , Thu, 2 Aug 2007 10:54:10
                            • Check this link out..., David, Thu, 2 Aug 2007 11:05:20
                        • Nitrous for 11's :-), John Williams , Thu, 2 Aug 2007 09:13:42
                          • dont run a pump in the engine bay, jak , Fri, 3 Aug 2007 15:56:25
                          • Re: Nitrous for 11's :-), David, Thu, 2 Aug 2007 10:05:06
                            • Re: Nitrous for 11's :-), John Williams , Thu, 2 Aug 2007 10:58:18
                • Having said all of that..., David, Thu, 2 Aug 2007 05:09:44
  • Now THAT'S what I'm talkin' about right there...n/m, David, Tue, 31 Jul 2007 18:52:01

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