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Re: RRFPR Need a expiation??
Posted by ubipa (more from ubipa) on Fri, 7 May 2004 13:57:11
In Reply to: RRFPR Need a expiation??, Inga
[Profile/Gallery]
, Fri, 7 May 2004 12:08:54
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Isn't it 1:1? fpr are there to counter act manifold pressures too standardize the control so there's one less variable to compensate for. ie. say it's a 43psi regulator, 1psi of boost is counteracted w/ 43+1=44 psi of fuel and the flowrate remains constant.
A rrfpr is more of a work around to add more fuel during higher boost that's not compensated for within the electronics. This only works on wot open loop fuel injection system (which most saabs use). No ego correction is used during wot. A rrfpr will increase fuel pressure in a ratio higher than 1:1. ie. 1.3:1 or 1.7:1 or 2:1 usually for 2.0L 's.
The down sides:
you can be running a steady 15Psi of boost but the load could still change and required a different amt of fuel
Fuel pump can run out of steam and not provide enough flow
You can run at such a high fuel psi that the fuel pump could prematurely fail and also it's possible for the injectors to lock. I've tested a set that wouldn't open above 70-80psi.
A properly fitted rrfpr will do some what of the trick...but I'm not a big fan.
posted by 68.174.66...
Posts in this Thread:
- RRFPR Need a expiation??, Inga
, Fri, 7 May 2004 12:08:54- Re: RRFPR Need a expiation??, SWEDISH DYNAMICS,INC, Fri, 7 May 2004 15:37:04
- Re: RRFPR Need a expiation??, ubipa, Fri, 7 May 2004 13:57:11 <-- Viewing This Message
- an atempt to explain :-), jak
, Fri, 7 May 2004 13:13:10
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