Afr question...
05-16-2018, 12:04 PM
#61
Melting Slicks
If he has a tune-able ECU it can surely take advantage of the vacuum referencing capability of a regulator. It is only 1 line to hook up and he can drop vacuum for idle/cruise significantly lowering the fuel pressure for those times.
This will:
1. extend fuel pump life
2. keep fuel cooler
3. fuel systems components will last longer in general
4. reduce current draw of fuel pump
To me, this^^^ is all 'needed'.
This will:
1. extend fuel pump life
2. keep fuel cooler
3. fuel systems components will last longer in general
4. reduce current draw of fuel pump
To me, this^^^ is all 'needed'.
05-16-2018, 02:16 PM
#62
Race Director
Member Since: May 2004
Location: Raleigh, NC
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St. Jude Donor '15
You should probably let GM know all these improvements they could get from putting vacuum referenced regulators back on their cars
/sarcasm
/sarcasm
Last edited by schpenxel; 05-16-2018 at 02:18 PM.
05-16-2018, 02:17 PM
#63
Melting Slicks
You could also say a boost signal is not needed either.
Doesn't make it a good way to do things.
There really is no reason to reference anywhere other than the intake manifold. There are no benefits to taking the reference from elsewhere.
Doesn't make it a good way to do things.
There really is no reason to reference anywhere other than the intake manifold. There are no benefits to taking the reference from elsewhere.
05-16-2018, 02:20 PM
#64
Melting Slicks
People, manufacturers etc do different things for different reasons.
05-16-2018, 02:32 PM
#65
Supporting Vendor
You could say it, but it wouldn’t make it true.
How so? How about the vehicle owner is currently tight on money and his IDC is too high or maxed out because of the boost he’s running? Let’s say 28psi boost and not boost referenced for instance. Now, as you well know, he has only 30psi across his injector. Boost referencing gives him the fix he needs for now without having to spend money he doesn’t currently have or want to spend.
How about another one of my customers running 40psi boost? Yes 40. And you’re going to say for the sake of your argument that a boost reference signal isn’t needed? I know you to be a smarter cat than that.
The customer happens to want to tap into his charge pipe for a signal. So what? Get the benefits of boost referencing and everything else remains as GM designed it as far as fueling is concerned.
There certainly is a benefit from getting the boost side of it and absolutely no harm in not getting it on the vacuum
side. Never thought of it? Okay, fine, but think about it. It has all the upside that the car owner desires with none of the downside.
05-16-2018, 02:37 PM
#67
Melting Slicks
I want to believe their decision in this case has something to do with regulator placement near the rear of the vehicle, near the tank. For whatever reason (probably engine bay clutter and unique access) an under-car replaceable, serviceable filter-regulator was established, and the idea of running a vacuum signal from the engine to the rear of the car was laughable. So they argued the system was worth more than the fuel system parts that needed to be replaced sooner, and that someone could just add a real regulator up front (I mean, duh you notice right away when you go to build the car) if they recognized the need for proper reference in the fuel system easily enough. As even if they gave us one we would still probably seek to replace it at a level due to flow orifice diameter, anyways.
It isn't a problem for GM dealership when serviceable parts fail in our cars, and need to be replaced. Especially parts that need a couple hundred dollars to get going again, like timing belts, brake pads, clutches, fuel pumps. I think we've all tried, in one way or another, to get our car manufacturers to implement systems which last longer.
Just because it isn't there, doesn't mean we won't benefit from it. If you bought a car with no A/C would you immediately suggest that I let the manufacturers know "hey guys you forgot / need A/C". Or a sunroof. Or a battery life extender. Or a spare tire. Or a fuel system stress reliever.
Last edited by Kingtal0n; 05-16-2018 at 02:39 PM.
05-18-2018, 08:45 PM
#68
Le Mans Master
Thread Starter
[QUOTE=schpenxel;1597211604]You should probably let GM know all these improvements they could get from putting vacuum referenced regulators back on their
Last edited by C U IN REARVEIW; 05-18-2018 at 09:06 PM.