Afr question...
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Le Mans Master
Joined: Jan 2009
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From: ocean springs mississippi
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 5,656
Likes: 112
From: ocean springs mississippi
Melting Slicks
Joined: Jul 2004
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From: Northern Ireland
Thread Starter
Le Mans Master
Joined: Jan 2009
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From: ocean springs mississippi
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....?
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Melting Slicks
Joined: Jul 2004
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From: Northern Ireland
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; May 15, 2018 at 03:45 PM.
Thread Starter
Le Mans Master
Joined: Jan 2009
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From: ocean springs mississippi
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.
Race Director
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From: Raleigh, NC
St. Jude Donor '15
But obviously we're saying the same thing in a different way
Melting Slicks
Joined: Jul 2004
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From: Northern Ireland
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.
Thread Starter
Le Mans Master
Joined: Jan 2009
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From: ocean springs mississippi
Lol...That's what I was trying say.....lol
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 5,656
Likes: 112
From: ocean springs mississippi
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.
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 5,656
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From: ocean springs mississippi
Supporting Vendor
Joined: Apr 2012
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From: Forney TX
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; May 16, 2018 at 10:01 AM.
Supporting Vendor
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From: Forney TX
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.
Safety Car
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From: South Florida
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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Race Director
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From: Raleigh, NC
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...