Afr question...
#41
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#42
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St. Jude Donor '15
Needs to be off the intake manifold, similar place to how the bypass valve, brake booster hose, etc. are connected
#43
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St. Jude Donor '15
No, def don’t want it to be connected there. IMO anyways
Last edited by schpenxel; 05-14-2018 at 11:01 PM.
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St. Jude Donor '15
Yes, but you want to be taking that reading for boost/vacuum at the same place as the injectors, so intake manifold basically
#47
Melting Slicks
#48
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So where should i be plumbing the line to then.....off brake booster like hobbs switch? I believe it may have been due to the fact my (in charge tube) fuel regulator is in the drivers rear wheel well...and vacuum pressure would be to delayed....?
#49
Melting Slicks
As everyone has said, it is normal to reference the FPR to the intake manifold.
If you make any changes, it will need tuned to suit.
If you make any changes, it will need tuned to suit.
Last edited by stevieturbo; 05-15-2018 at 03:45 PM.
#50
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Urs this car has had alot of changes and will be tuning it as soon as im done....definitely a maiden voyage for me and im learning as i go. Thanks for your help.
#51
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St. Jude Donor '15
But obviously we're saying the same thing in a different way
#52
Melting Slicks
Yep, it sounded like he was asking or stating that fuel pressure should decrease with boost. It should not.
Even with a fixed rail pressure, whilst fuel pressure does not drop with boost, pressure delta across the injector does which will reduce ability to flow.
Not the end of the world for a low boost setup, but never a great scenario anyway.
Even with a fixed rail pressure, whilst fuel pressure does not drop with boost, pressure delta across the injector does which will reduce ability to flow.
Not the end of the world for a low boost setup, but never a great scenario anyway.
#53
Le Mans Master
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Lol...That's what I was trying say.....lol
#54
Le Mans Master
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Yep, it sounded like he was asking or stating that fuel pressure should decrease with boost. It should not.
Even with a fixed rail pressure, whilst fuel pressure does not drop with boost, pressure delta across the injector does which will reduce ability to flow.
Not the end of the world for a low boost setup, but never a great scenario anyway.
Even with a fixed rail pressure, whilst fuel pressure does not drop with boost, pressure delta across the injector does which will reduce ability to flow.
Not the end of the world for a low boost setup, but never a great scenario anyway.
#55
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#56
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What I said is that without boost referencing, the delta or pressure differential across the injector diminishes 1lb for every 1lb boost applied. If you're making 20psi boost and you're set at 58psi without boost referencing, your resultant pressure across the injector is 38psi.
Last edited by BLOWNBLUEZ06@RKT Performance; 05-16-2018 at 10:01 AM.
#57
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How come? If I set his tables up properly and fully tune the car, like I always do, it's not going to be an issue. Never has been in the past. It's a bit different thought process, I'll agree, but as long as it's set up right in the fuel tables, you get the same desired result.
#58
Melting Slicks
Because 'charge tube' sounds like pre-throttle body tube, i.e. cold pipe, i.e. intake air tube leading to the engine.
There is no vacuum in this tube to drive the regulator into a vacuum reference
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St. Jude Donor '15
I stand corrected.. I've never done it that way (or heard of doing it that way honestly), but as long as the fuel injector data is setup accordingly I don't see any reason why it wouldn't work...