Blown Hawk

Well I started the thread a while back about installing my 42# injectors and what changes needed to be made in LS1Edit. In dealing with the Injector Flow Rate table the topic of vacuum/boost referenced fuel pressure regulator came up. I'm curious to hear your all's thoughts on this.

I want the safest most reliable FI setup I can achieve within my means. ATI Tuner kit rumming 8psi pully stock engine with bolt-ons. Future plans are for 73cc 6.0L heads and then forged rods and pistons.

So what are the pros and cons of the vacuum/boost referenced FPR over my stock FPR. Will this make tuning easier or harder? Also how much is one of the vacuum/boost referenced FPRs and how difficult is the install?

Thanks guys,
BH

Blackbird

$120 from charged air systems
pro's are it really makes things easier to tune IMO as FP is now constant at the rail at all times.
install is pretty easy. you have to get a little creative though since it's not a direct plug in. a few of us here that have installed them have done it a few different ways.

con's - none except your wallet being $120 lighter <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

I always recommend doing this to anybody that asks me about a FI fuel system.

redaddiction

iTrader: (12)

which one did you use and do you have any pics installed looking to put this on the truck especially if it makes it easier to tune

marc

MIGHTYMOUSE

iTrader: (59)

check my fuel system pics on sig (charged air regulator)

you really want the fuel pressure to rise with boost pressre when having one of these.


if you dont, then as you build boost, your fuel pressure is actually dropping by the same psi reference. example if you have 20psi boost and 60psi fuel, the fuel flows like its only at 40psi (60-20) which is uncomfortably low (unless you tune for it to be that way by opening pulsewidth)

that was explained pretty well in the other post.

Blown Hawk

Hey David,

On your page was picture dsc00795 the charged air regulator? If so did you need anything special to install it?

Thanks,
BH

MIGHTYMOUSE

iTrader: (59)

yes i have the charged air regulator


my whole fuel system layout has changed, the regulator is beside the engine, not in the tank like stock so it sure wasn't a snap in deal.

there are some people that have put it into the stock return line back over the axle like cablebandit i think did, and smokinhawk too i think. maybe they can help you more on what to do to get one on your car.

i just bought the matching -6 fittings from jegs and put them on the braided line and screwed it on.

Lost & Found2

So the regulator can be placed on the stock return line?

MIGHTYMOUSE

iTrader: (59)

yes, and i'm pretty sure the guys that did it like that put it in the over the axle area of the return line.


just remember to take the stock regulator out while you put the new one in or your fuel pressure will never drop below 60 under idle/vaccum situations.

Blown Hawk

Not that it matters, cause I think I'm gonna go ahead and pick one of these up. But how does it work? Is it a completely mechanical unit? Or does it need to be wired up and communicates to the fuel pumps via the computer?

Gracias,
BH

Blown Hawk

Hey Guys had some more questions about this FPR. I was under the impression that we already have a return fuel line which would mean that our FPR is up at the fuel rails. But Dave(MightyMouse) you made it seem like you had to customize your fuel system to put the FPR by the rails.

Also, after looking at Dave's pictures of his Boost referenced FPR I don't see any vacuum lines. So how does the FPR know when your in boost and need more fuel pressure? Perhaps there is a vacuum line and I just couldn't see it in that pic. Any help on these two questions would be appreciated.

BH

slow

iTrader: (7)

no, we only have one line to the rails, the return line goes from the output of the filter, to the tank, where the regulator is stock.

There is a T between the filter, and the regulator, that feeds the rails.

Ryan.

Blackbird

the return line is in the rear of the car at the T block by the fuel filter.

yes the regulator has a vacum port you need to run a vacum line too.

been using this regulator for a while. works very well.

Blown Hawk

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Blackbird:
<strong> the return line is in the rear of the car at the T block by the fuel filter.

yes the regulator has a vacum port you need to run a vacum line too.

been using this regulator for a while. works very well. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">So is there a certain horsepower level when I need to run the FPR at the rails?

BH

Blackbird

as far as I know the only reason to put it up at the rails is for convienence sake. not a hp level dictating that.

mightymouse has his there because he did a complete new fuel system with all new braided lines, etc.... pretty much nothing stock about it now. he could have just as easily mounted the regulator in back but when you could have it under the hood easily accessable why?

Blown Hawk

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Blackbird:
<strong> as far as I know the only reason to put it up at the rails is for convienence sake. not a hp level dictating that.

mightymouse has his there because he did a complete new fuel system with all new braided lines, etc.... pretty much nothing stock about it now. he could have just as easily mounted the regulator in back but when you could have it under the hood easily accessable why? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That's great to know. I guess I just assumed that with the FPR further back and having all that additional fuel line in front of it to pressurize that that would create an issue. Or I'd be at a disadvantage cause I would have more area(fuel line) to regulate pressure for.

Thanks for clearing it up bro.

Mike

JoshuaGrooms83

iTrader: (2)

just for clearification, we hook this up to a vac/boost source like the brake boost line right? (manifold)