1 bar vs. 1.1 bar
Site Moderator
Joined: Sep 2005
Posts: 13,664
RE: 1 bar vs. 1.1 bar
I asked the same question a while back about using a 5 bar fpr with GIAC or any other1.1bar+ chipthat doesnt recomend the use of an upgraded fpr.Im still sort of wondering about it. But from the answers I got and reading up it seems that if you drive your car real harda lot or track it often, a 5bar fpr would help because some chips like GIAC and APR lean out in the higher rpms. So while a 5 bar fpr might help you in the higher rpms, what does it do for you in regular conservative/city driving? Does it make you run rich? IDK!? I have also read that a 5 bar fpr puts extra strain on your fuel pump, and it can become noisy. All a 5 bar fpr is, is a 4 bar fpr with the top "crushed" You could make your 4 bar fpr into a 5 bar by pushing down the top of it with like a drill press type tool (I dont mean drill through it, i just mean something that will give enough steady force to crush it to decrease the volume on the inside) but then i wouldnt know how much to "crush" or pushit down exactly. I think the best thing to do would be to get an adjustable fpr and play with it while logging with vag com to see what fuel pressure is best all around if you care that much.
Joined: Nov 2005
Posts: 12,826
From:
RE: 1 bar vs. 1.1 bar
normally done on a rolling road setup to get the best results then its down to the laptop for racing setups and that's where the adjustable FPR comes in but you better know what your doing because any failor will cost you an engine if you over do it
Site Moderator
Joined: Sep 2005
Posts: 13,664
RE: 1 bar vs. 1.1 bar
All you have to do is make sure you start out at 4 bar with the afpr and go from there. If you start it at 4 bar, you have no chance of running too lean. If you go much past 5 bar, im sure youll be running really rich, running rich for very short periods of time does no long term damage. You might have to replace your plugs if you really **** up. But its better than replacing an engine if you go too lean.
Site Moderator
Joined: Sep 2005
Posts: 13,664
RE: 1 bar vs. 1.1 bar
Here is the neuspeed/5bar fpr product description:
"If you have a 1 bar or higher chip in your 1997-99 A4 1.8T or 1998-99 Passat 1.8T, our 5-bar fuel pressure regulator will give you the extra fuel delivery you need for high RPM/load operation. We modify a new regulator to increase the line pressure.
Notes
Recommended for vehicles that see sustained high speed/high RPM conditions such as open track events. "
So, they make it sound like "if you drive like an *** hole all the time, or go to the track, this is the fpr for YOU!"
"If you have a 1 bar or higher chip in your 1997-99 A4 1.8T or 1998-99 Passat 1.8T, our 5-bar fuel pressure regulator will give you the extra fuel delivery you need for high RPM/load operation. We modify a new regulator to increase the line pressure.
Notes
Recommended for vehicles that see sustained high speed/high RPM conditions such as open track events. "
So, they make it sound like "if you drive like an *** hole all the time, or go to the track, this is the fpr for YOU!"
4th Gear
Joined: Aug 2006
Posts: 5,769
From: Phoenix Arizona
RE: 1 bar vs. 1.1 bar
ORIGINAL: onepoint8tee
Here is the neuspeed/5bar fpr product description:
"If you have a 1 bar or higher chip in your 1997-99 A4 1.8T or 1998-99 Passat 1.8T, our 5-bar fuel pressure regulator will give you the extra fuel delivery you need for high RPM/load operation. We modify a new regulator to increase the line pressure.
Notes
Recommended for vehicles that see sustained high speed/high RPM conditions such as open track events. "
So, they make it sound like "if you drive like an *** hole all the time, or go to the track, this is the fpr for YOU!"
Here is the neuspeed/5bar fpr product description:
"If you have a 1 bar or higher chip in your 1997-99 A4 1.8T or 1998-99 Passat 1.8T, our 5-bar fuel pressure regulator will give you the extra fuel delivery you need for high RPM/load operation. We modify a new regulator to increase the line pressure.
Notes
Recommended for vehicles that see sustained high speed/high RPM conditions such as open track events. "
So, they make it sound like "if you drive like an *** hole all the time, or go to the track, this is the fpr for YOU!"
Josh
1st Gear
Joined: Feb 2007
Posts: 113
From:
RE: 1 bar vs. 1.1 bar
http://www.eclubvw.com/forums/showthread.php?t=3086
found this thread when i googled... maybe this will be helpful.
i think i'll ask my GIAC shop anyways... they make 1250hp porches... so maybe they'll know someting about an fpr... =)
found this thread when i googled... maybe this will be helpful.
i think i'll ask my GIAC shop anyways... they make 1250hp porches... so maybe they'll know someting about an fpr... =)
1st Gear
Joined: Oct 2006
Posts: 460
From:
RE: 1 bar vs. 1.1 bar
Have you ever heard a high output race fuel pump? They humm and whistle constantly VERY annoying. Im sure a larger FPR would have some strain on our stock FPR. Just look at it this way. You upgrade your FPR if you add forced induction to a normally aspirated motor, so in that instance, its obviously important to build more pressure. On a car that is already FI'd I would be less concerned unless if you are going with something that is a lot larger or has a greater demand for fuel, which in turn also requires larger injectors and Fuel rail.
ORIGINAL: onepoint8tee
I asked the same question a while back about using a 5 bar fpr with GIAC or any other1.1bar+ chipthat doesnt recomend the use of an upgraded fpr.Im still sort of wondering about it. But from the answers I got and reading up it seems that if you drive your car real harda lot or track it often, a 5bar fpr would help because some chips like GIAC and APR lean out in the higher rpms. So while a 5 bar fpr might help you in the higher rpms, what does it do for you in regular conservative/city driving? Does it make you run rich? IDK!? I have also read that a 5 bar fpr puts extra strain on your fuel pump, and it can become noisy. All a 5 bar fpr is, is a 4 bar fpr with the top "crushed" You could make your 4 bar fpr into a 5 bar by pushing down the top of it with like a drill press type tool (I dont mean drill through it, i just mean something that will give enough steady force to crush it to decrease the volume on the inside) but then i wouldnt know how much to "crush" or pushit down exactly. I think the best thing to do would be to get an adjustable fpr and play with it while logging with vag com to see what fuel pressure is best all around if you care that much.
I asked the same question a while back about using a 5 bar fpr with GIAC or any other1.1bar+ chipthat doesnt recomend the use of an upgraded fpr.Im still sort of wondering about it. But from the answers I got and reading up it seems that if you drive your car real harda lot or track it often, a 5bar fpr would help because some chips like GIAC and APR lean out in the higher rpms. So while a 5 bar fpr might help you in the higher rpms, what does it do for you in regular conservative/city driving? Does it make you run rich? IDK!? I have also read that a 5 bar fpr puts extra strain on your fuel pump, and it can become noisy. All a 5 bar fpr is, is a 4 bar fpr with the top "crushed" You could make your 4 bar fpr into a 5 bar by pushing down the top of it with like a drill press type tool (I dont mean drill through it, i just mean something that will give enough steady force to crush it to decrease the volume on the inside) but then i wouldnt know how much to "crush" or pushit down exactly. I think the best thing to do would be to get an adjustable fpr and play with it while logging with vag com to see what fuel pressure is best all around if you care that much.
Site Moderator
Joined: Sep 2005
Posts: 13,664
RE: 1 bar vs. 1.1 bar
ORIGINAL: A4nicator
Have you ever heard a high output race fuel pump? They humm and whistle constantly VERY annoying. Im sure a larger FPR would have some strain on our stock FPR. Just look at it this way. You upgrade your FPR if you add forced induction to a normally aspirated motor, so in that instance, its obviously important to build more pressure. On a car that is already FI'd I would be less concerned unless if you are going with something that is a lot larger or has a greater demand for fuel, which in turn also requires larger injectors and Fuel rail.
Have you ever heard a high output race fuel pump? They humm and whistle constantly VERY annoying. Im sure a larger FPR would have some strain on our stock FPR. Just look at it this way. You upgrade your FPR if you add forced induction to a normally aspirated motor, so in that instance, its obviously important to build more pressure. On a car that is already FI'd I would be less concerned unless if you are going with something that is a lot larger or has a greater demand for fuel, which in turn also requires larger injectors and Fuel rail.
1st Gear
Joined: Oct 2006
Posts: 460
From:
RE: 1 bar vs. 1.1 bar
Lol no no no, Im talking aeromotive fully electronic adjustable pumps!! Walbros are loud, but aeros are insane.
ORIGINAL: onepoint8tee
Sure, lots of people use walbro high output fuel pumps with their BT setups because they are built for high pressure/output. Most people use a 5bar fpr with their k04 setups while using the stock fuel pump with no problems, so its probably not a big deal.
ORIGINAL: A4nicator
Have you ever heard a high output race fuel pump? They humm and whistle constantly VERY annoying. Im sure a larger FPR would have some strain on our stock FPR. Just look at it this way. You upgrade your FPR if you add forced induction to a normally aspirated motor, so in that instance, its obviously important to build more pressure. On a car that is already FI'd I would be less concerned unless if you are going with something that is a lot larger or has a greater demand for fuel, which in turn also requires larger injectors and Fuel rail.
Have you ever heard a high output race fuel pump? They humm and whistle constantly VERY annoying. Im sure a larger FPR would have some strain on our stock FPR. Just look at it this way. You upgrade your FPR if you add forced induction to a normally aspirated motor, so in that instance, its obviously important to build more pressure. On a car that is already FI'd I would be less concerned unless if you are going with something that is a lot larger or has a greater demand for fuel, which in turn also requires larger injectors and Fuel rail.