entropy
Moderator
Posts: 8671
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posted July 11, 2008 02:13 AM
fuel pressure regulator: why vac line?
anyone understand how it works?
Today i'm gonna experiment with the fp regulator, cause mine is acting flaky.
Thanks to JohnnyCheese, i have a spare set of TB's, complete w/reg etc
Thanks to a tip from DaveO, i have an adj regulator.
let the testing begin
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Y2KZX12R
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CompetitionCNC.com
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posted July 11, 2008 04:00 AM
Karl, the vac lowers the fuel pressure in the rail at an idle.
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Y2KZX12R
CompetitionCNC.com
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entropy
Moderator
Posts: 8671
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posted July 11, 2008 04:58 AM
quote:
Karl, the vac lowers the fuel pressure in the rail at an idle.
thanks, Jim
i a bit i will start testing stuff (including pressure at idle), see what happens.
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tcchin
Zone Head
Posts: 867
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posted July 11, 2008 08:16 AM
Note that you can reduce the injector duty cycle by increasing the fuel pressure, if that's still a concern for you. High pressures also help with fuel atomization to some degree. Also note that bikes with in-tank regulators (most Suzukis and Yamahas, recent Hondas and Kawis) don't use a vacuum line to reduce line pressures at idle/high vacuum conditions. As long as you have a way to control mixture at idle (e.g., PC3R or reflashed ECU), a vacuum line should not be required.
FWIW, some F1 FI systems use ~100psi line pressures. Some of the factory AMA Superbike teams were doing research in that area until the as-homologated fuel pump rule was implemented this year.
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KZScott
Needs a life
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posted July 11, 2008 12:56 PM
Hey Karl, you can increase FP by putting pressure to the vac line. KCadby did that to Johns bike for a dry nitrous kit. no PC map changes and the right AFR.....im thinking about trying it
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osti33
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posted July 11, 2008 01:15 PM
 Edited By: osti33 on 11 Jul 2008 14:17
You won't need the vac line Karl. It lowers the fuel pressure at idle. Just leave it open to atmosphere. You can control the fuel with the PC3.
EDIT I should have read all the replies first. Tcchin and Y2K said the same thing I just said.
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