Okay with all due respect

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Okay with all due respect Posted by Jay Hassinger (more from Jay Hassinger) on Sun, 13 Jan 2002 08:33:38

In Reply to: Your a big FAN of rrfpr......., GreggC, Sat, 12 Jan 2002 18:51:17 Members do not see ads below this line. - Help Keep This Site Online - Signup

I don't think you undestand how injectors work, and fuel pumps flow in relation to pressure.

When you raise fuel pressure, flow goes *DOWN*. I know, it's contrary to common thought. So even though you may have seen good fuel *pressure* the fuel *flow* was not there.

Some fuel pumps can't flow enough to feed a 5hp lawnmower engine at 90psi, yet will show great pressure.

I don't have a strong opinion about anything, I just understand how FI systems work. Calculating fuel injector flow and size are engineering principles that work for every other car in the world. The Saab isn't some mystical car that does things that are unexplainable.

If companies like Motec, Jim Wolf Technology (Pioneers in ECU hacking, programming EFI sytems since 1978) and others say a smaller injector with higher pressure is a better solution than oversizing the injector I will trust their word. Not to mention this has been my experience as well.

If someone is willing to send an old stock fuel pump to RC Engineering and have them flow it I *guarantee* you will see it has trouble flowing at high pressures. That's where your lean condition is coming from with RRFPR's. As I said it's the PUMP not the RRFPR that is causing it.

I respect your opinion, but I don't buy into the "we've been over this before, this is the way it is just accept it" mentality. In my world you search until you find the problem, and fix it. In this case I think it's the fuel pump running out of flow with high pressure.

Has ANYONE upgraded their fuel pump and still had the same lean condition with a RRFPR?

posted by 24.18.1...

Posts in this Thread:

30 lb Fuel Injector Question, EJ, Sat, 12 Jan 2002 02:21:44
- What I did, mathiasB, Sun, 13 Jan 2002 05:47:14
- Re: 30 lb Fuel Injector Question, Brad, Sat, 12 Jan 2002 10:23:00
  - Some real balance.., SteveW, Sat, 12 Jan 2002 11:34:56
    - Re: Some real balance.., Justin VanAbrahams , Sun, 13 Jan 2002 00:32:24
      - Re: Some real balance.., EJ, Sun, 13 Jan 2002 01:56:36
        Here..., Justin VanAbrahams , Sun, 13 Jan 2002 10:29:22
- Get the fueling corrected..., Keith S, Sat, 12 Jan 2002 08:59:09
  - To bring some balance to your statement, Jay Hassinger, Sat, 12 Jan 2002 09:39:37
    - adverse effects of 85-90psi line pressure is that, steveC in BC, Sat, 12 Jan 2002 13:35:42
      - thanks,, dave n, Sat, 12 Jan 2002 20:58:54
        Yep, Jay Hassinger, Sun, 13 Jan 2002 08:39:07
        Re: Got one a few months ago..., Cliff, Sat, 12 Jan 2002 23:51:22
    - Totally disagree Jay...., GreggC, Sat, 12 Jan 2002 10:37:15
      - Well in that case, Jay Hassinger, Sat, 12 Jan 2002 15:05:23
        Your a big FAN of rrfpr......., GreggC, Sat, 12 Jan 2002 18:51:17
        Okay with all due respect, Jay Hassinger, Sun, 13 Jan 2002 08:33:38 <-- Viewing This Message
        Something to think about....., GreggC, Sun, 13 Jan 2002 22:53:34
        Bosch pumps and LH ..., Kevin K , Sun, 13 Jan 2002 18:36:06
        Bosch pumps and LH+5Th inj+rail knock, SteveW, Sun, 13 Jan 2002 21:58:44
        Re: Okay with all due respect, Justin VanAbrahams , Sun, 13 Jan 2002 10:40:47
        I'd like to rephrase that question..., Eric van Spelde, Sun, 13 Jan 2002 09:34:12
        what is the solution?, dave n, Sat, 12 Jan 2002 20:57:23
        Re: what is the solution?, Jay Hassingerq, Sun, 13 Jan 2002 08:36:56
        Re: what is the solution?, chrisx, Sat, 12 Jan 2002 21:27:56
        oh no..fanning fires.....n/m, chrisx, Sat, 12 Jan 2002 20:50:38
    - AMM calibration, Keith S, Sat, 12 Jan 2002 10:27:25

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