how do I set fuel pressure?
Thread Starter
Instructor
Joined: Feb 2007
Posts: 172
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From: Harrisburg Pa
how do I set fuel pressure?
Hey guys, I have decided to run a return line on my 01 TT z06 and I have a question about setting the fuel pressure.
I am using an aeromotive fuel pressure regulator (#13105) off the fuel rail with a return line to the tank and I was wondering how do I set the fuel pressure on it? It has an adjustment screw on the top.
I know that you hook a vacuum line up to it and then with every 1psi of boost it will raise it 1 psi of fuel. But what should I set it for at idle. After the initial setup do I just hook the vacuum line up and let it raise itself under boost. Sorry if this is a dumb question, never messed around with doing fuel pressures before.
Thanks I appreciate!
I am using an aeromotive fuel pressure regulator (#13105) off the fuel rail with a return line to the tank and I was wondering how do I set the fuel pressure on it? It has an adjustment screw on the top.
I know that you hook a vacuum line up to it and then with every 1psi of boost it will raise it 1 psi of fuel. But what should I set it for at idle. After the initial setup do I just hook the vacuum line up and let it raise itself under boost. Sorry if this is a dumb question, never messed around with doing fuel pressures before.
Thanks I appreciate!
Thread Starter
Instructor
Joined: Feb 2007
Posts: 172
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From: Harrisburg Pa
Yes what I did was replace the OE fuel filter with the built in regulator, with a 97/98 fuel filter without the regulator.
So after I set the intial idle fuel pressure to around 60psi I should then hook up the vacuum to the nipple of the aeromotive regulator?
Thanks you guys are really helpful
Tech Contributor
Joined: Jan 2007
Posts: 19,511
Likes: 1,186
From: Dyer, IN
Thread Starter
Instructor
Joined: Feb 2007
Posts: 172
Likes: 0
From: Harrisburg Pa
I am by no means an expert on this, but after talking to some fellow forum members this setup will yield a larger amount of fuel for high horsepower applications. I run a little over 600whp but am running out of fuel. The weak link on the newer C5's was that it didn't have a return line. By using the 97/98 fuel filter without the built in regulator you can then add an aftermarket pressure regulator. Run a line off the shrader on the fuel rail to a regulator and then from the regulator to the fuel tank(return line).
This combination along with a good fuel pump, BAP, and injectors can see over 700whp, some of the guys are making 800whp on this setup.
The advantage? Alot more horsepower capabilities without breaking the bank.
Maybe some of the guys that helped me will chime in...I didn't come up with the idea. But it is a great idea. I think it is an excellent compromise between a big budget fuel system for someone who wants to make some good power but doesn't want to go extreme.
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
I am by no means an expert on this, but after talking to some fellow forum members this setup will yield a larger amount of fuel for high horsepower applications. I run a little over 600whp but am running out of fuel. The weak link on the newer C5's was that it didn't have a return line. By using the 97/98 fuel filter without the built in regulator you can then add an aftermarket pressure regulator. Run a line off the shrader on the fuel rail to a regulator and then from the regulator to the fuel tank(return line).
This combination along with a good fuel pump, BAP, and injectors can see over 700whp, some of the guys are making 800whp on this setup.
The advantage? Alot more horsepower capabilities without breaking the bank.
Maybe some of the guys that helped me will chime in...I didn't come up with the idea. But it is a great idea. I think it is an excellent compromise between a big budget fuel system for someone who wants to make some good power but doesn't want to go extreme.
This combination along with a good fuel pump, BAP, and injectors can see over 700whp, some of the guys are making 800whp on this setup.
The advantage? Alot more horsepower capabilities without breaking the bank.
Maybe some of the guys that helped me will chime in...I didn't come up with the idea. But it is a great idea. I think it is an excellent compromise between a big budget fuel system for someone who wants to make some good power but doesn't want to go extreme.
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Thread Starter
Instructor
Joined: Feb 2007
Posts: 172
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From: Harrisburg Pa
What is the difference with the 97/98 rail over the one I have on my 01? It seems like the same rail I have other than the return line, which I didn' t want, because I wanted to run my own custom line of the shrader for a aeromotive regulator. And all things being the same, wouldn't that be like buying the same rail I have?
Thanks
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
What is the difference with the 97/98 rail over the one I have on my 01? It seems like the same rail I have other than the return line, which I didn' t want, because I wanted to run my own custom line of the shrader for a aeromotive regulator. And all things being the same, wouldn't that be like buying the same rail I have?
Thanks
Thanks
Then you can tap into the shrader valve port for a fuel pressure gage.
Just saw you plan on running an Aeromotive regulator, is it that much better then a stock one? Also there are stock type that are adjustable I forget who sells them but I have one on my car.
Thread Starter
Instructor
Joined: Feb 2007
Posts: 172
Likes: 0
From: Harrisburg Pa
You know to be honest, I have no idea if my new aeromotive regulator is much better then the stock one on a 97/98. I went with the aeromotive because it's boost activated. For every one psi of boost, the regulator will raise fuel 1 psi.
Does the stock 97/98 do that?
Thanks
Alex
Does the stock 97/98 do that?
Thanks
Alex
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
You know to be honest, I have no idea if my new aeromotive regulator is much better then the stock one on a 97/98. I went with the aeromotive because it's boost activated. For every one psi of boost, the regulator will raise fuel 1 psi.
Does the stock 97/98 do that?
Thanks
Alex
Does the stock 97/98 do that?
Thanks
Alex
My tuner turned my adjustable aftermarket reg up to 62 psi and I run with that.
Thread Starter
Instructor
Joined: Feb 2007
Posts: 172
Likes: 0
From: Harrisburg Pa
Tech Contributor
Joined: Jan 2007
Posts: 19,511
Likes: 1,186
From: Dyer, IN
I am by no means an expert on this, but after talking to some fellow forum members this setup will yield a larger amount of fuel for high horsepower applications. I run a little over 600whp but am running out of fuel. The weak link on the newer C5's was that it didn't have a return line. By using the 97/98 fuel filter without the built in regulator you can then add an aftermarket pressure regulator. Run a line off the shrader on the fuel rail to a regulator and then from the regulator to the fuel tank(return line).
This combination along with a good fuel pump, BAP, and injectors can see over 700whp, some of the guys are making 800whp on this setup.
The advantage? Alot more horsepower capabilities without breaking the bank.
Maybe some of the guys that helped me will chime in...I didn't come up with the idea. But it is a great idea. I think it is an excellent compromise between a big budget fuel system for someone who wants to make some good power but doesn't want to go extreme.
This combination along with a good fuel pump, BAP, and injectors can see over 700whp, some of the guys are making 800whp on this setup.
The advantage? Alot more horsepower capabilities without breaking the bank.
Maybe some of the guys that helped me will chime in...I didn't come up with the idea. But it is a great idea. I think it is an excellent compromise between a big budget fuel system for someone who wants to make some good power but doesn't want to go extreme.
Thread Starter
Instructor
Joined: Feb 2007
Posts: 172
Likes: 0
From: Harrisburg Pa
Well I am sure everybody's set up is going to vary slightly, but for mine at 611whp/650wtq and 8psi at 5500 my fuel was nose diving. I didnt have enough to make more power. I had 65lb injectors, 255 fuel pump, and a BAP. So for my setup, my returnless factory fuel system was way to weak for my goal in power. So I did this new setup with the regulator after the rail, a return line, and a meth kit.
Having a pressure regulator the whole way back by the tank, as is when stock, just does not allow enough pressure at the rails.
And maybe yes the whole 97/98 stock setup might have worked fine, but that is not what I had, so I figured why bother with new rails and having to take things apart that arn't broken and decided just to add a $170 regulator, 10 ft of braided line, and $11 fuel filter.
Alex
Instructor
Joined: Jul 2006
Posts: 210
Likes: 2
From: Elkins Park PA
I believe that recirculating systems are pretty common on big diesels: earth moving equipment, generators, etc. I *think* that they usually recirculate to keep the fuel cool.
So... I suspect that heat would be the #1 reason.... #2 might be fuel pump design/head pressure/consistent pressure through the fuel lines.... but don't take my word for it.....
So... I suspect that heat would be the #1 reason.... #2 might be fuel pump design/head pressure/consistent pressure through the fuel lines.... but don't take my word for it.....
