Looking for input on this mod found in the Tech Tip section
Thread Starter
Le Mans Master
Joined: Jan 2002
Posts: 5,320
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From: Kyle TX (Because Mojo Made me fill it in)
Looking for input on this mod found in the Tech Tip section
Melting Slicks
Joined: Aug 2001
Posts: 2,047
Likes: 0
Re: Looking for input on this mod found in the Tech Tip section (VetteNoob)
My take on the fuel pressure mod is... any time the fuel pressure is varied on any car, it should be run on a dyno with A/F data acquisition. With the mods that they listed in that "tech tidbit", there's no real reason to increase fuel pressure. The factory typically sets f.p. to be at maximum economy and minimal emissions. Taking out a little pressure may yield 2 or 3 more hp over stock.. the cost of the dyno?? Make some more mods before doing this one.. It's gonna cost $150.00 minimum to try it out, so why not do some other stuff and tune it all at the same time? Survey says! "No go"... that's my vote.
Drifting
Joined: Jan 2001
Posts: 1,669
Likes: 1
Re: Looking for input on this mod found in the Tech Tip section (EricVonHa)
Actually I would not recommend removing the vaccum line. However you can increase your fp and gain some hp. The reason some say they make more hp by decreasing fp is becuase they turned it up too much the first. When you turn up the fpr you increase the amount of fuel through the injector. This can get complicated but to keep it simple you can go too far, if you keep your adjustment between 2-5# you will notice a difference. As far as your A/F is concerned your ECM will monitor that and keep it corrected, the adjustment a of the AFR comes into effect under WOT when the ECM cuts out the O2 sensor.
[Modified by snaketr, 10:43 PM 4/21/2002]
[Modified by snaketr, 10:43 PM 4/21/2002]
Race Director
Joined: Aug 2000
Posts: 14,130
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Cruise-In II Veteran
Re: Looking for input on this mod found in the Tech Tip section (snaketr)
If you have a stock motor,I wouldnt use a AFPR at all.
The stock one works fine.If someone had problems with their set up,and an AFPR helped,I would imagine their problem lied elsewhere.Also,GM sells their regulators with a little more pressure for some models to improve hot start conditions.You can always get a new one if yours is leaking and has hard hot start problems.
If not,leave it alone.
:)
The stock one works fine.If someone had problems with their set up,and an AFPR helped,I would imagine their problem lied elsewhere.Also,GM sells their regulators with a little more pressure for some models to improve hot start conditions.You can always get a new one if yours is leaking and has hard hot start problems.
If not,leave it alone.
:)
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
Re: Looking for input on this mod found in the Tech Tip section (VetteNoob)
I agree, don't do an AFPR alone. It's real value is realized in tuning fuel flow to added air flow. Although added pressure can provide better atomization from the spary pattern, it can add too much fuel unless you have the air flow to match.
Do some air flow (intake & exhaust), cooling, ignition, etc mods along with the AFPR. Then take it to the track or a dyno to tune it; a scan tool can get you in the ball park.
Do some air flow (intake & exhaust), cooling, ignition, etc mods along with the AFPR. Then take it to the track or a dyno to tune it; a scan tool can get you in the ball park.
Drifting
Joined: Dec 2000
Posts: 1,733
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From: Sarasota FL
Re: Looking for input on this mod found in the Tech Tip section (VetteNoob)
The vacuum connection is to reduce fuel pressure at idle and steady cruise. The WOT pressure should not be affected. Any possible variation should be canceled when the computer "learns" the new pressure. The O2 sensor controls "closed loop" operation and the changes are applied to the WOT fuel maps.
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Advanced
Joined: Aug 2001
Posts: 62
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From: colorado springs co
Re: Looking for input on this mod found in the Tech Tip section (VetteNoob)
I think I may have responded to this mod as well on 24 Apr 02. I did this mod and got a 5 psi increase over the 30 psi stock immediately just by plugging the vacuum line. I have an adjustable fuel pressure regulator (AFPR)that I could not adjust above stock because the car would sputter and run terribly. I equated the AFPR as a waste of money for my stock application. I have noticed in a 24hr time period a jump in fuel mileage from 16.6 mpg (accumulated average) city which has been the norm for the last couple of months to 16.7 mpg. It may be coincidence but I look forward to any more increase.
Le Mans Master
Joined: Dec 1999
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From: And on the fifth day, subpoenas were served to Obama senior staff
Re: Looking for input on this mod found in the Tech Tip section (captainjack)
OK at risk of getting flamed, this is a dumb mod. It lacks insight into the function of the fuel injection system. It should not be on the Tech Tips section as folks will do it.
If you get a gain from this mod, something is broken on your car. More gain will come from fixing what is broken.
Sorry, don't mean to offend anybody. But this is not a good mod. You run the risk of washing out cylinders with gas or burning lean at the worst of times.
FUEL PRESSURE REGULATOR = Regulates fuel pressure.
Remove vacuum hose and no fuel pressure regulation.
ADJUSTABLE FUEL PRESSURE REGULATOR = Tries to regulate fuel pressure at a value different than the stock regulator. Still regulates, and for good reason.
This tech tip should be removed. This string of posts will go away, but the tech tip will stay as an embarrassment to this fine forum. There are others as well, as of late.
Pete
If you get a gain from this mod, something is broken on your car. More gain will come from fixing what is broken.
Sorry, don't mean to offend anybody. But this is not a good mod. You run the risk of washing out cylinders with gas or burning lean at the worst of times.
FUEL PRESSURE REGULATOR = Regulates fuel pressure.
Remove vacuum hose and no fuel pressure regulation.
ADJUSTABLE FUEL PRESSURE REGULATOR = Tries to regulate fuel pressure at a value different than the stock regulator. Still regulates, and for good reason.
This tech tip should be removed. This string of posts will go away, but the tech tip will stay as an embarrassment to this fine forum. There are others as well, as of late.
Pete