putting an upgraded fuel pump on a N/A car
11-04-2006, 02:00 PM
#1
putting an upgraded fuel pump on a N/A car
would that cause a problem? putting a fuel pump thats meant for F/I cars on an N/A car? like that warlborough (spelling 
) fuel pump? what if i just put one of those in? would it help anything? would i notice gains? would it hurt anything? just wondering if anyone has done it
) fuel pump? what if i just put one of those in? would it help anything? would i notice gains? would it hurt anything? just wondering if anyone has done it
11-04-2006, 02:48 PM
#2
Originally Posted by busterdawg22
would that cause a problem? putting a fuel pump thats meant for F/I cars on an N/A car? like that warlborough (spelling ) fuel pump? what if i just put one of those in? would it help anything? would i notice gains? would it hurt anything? just wondering if anyone has done it
) fuel pump? what if i just put one of those in? would it help anything? would i notice gains? would it hurt anything? just wondering if anyone has done itDepending on which walbro pump you get (there are multiple variants that can go in a Max) you may have higher base fuel pressure than normal. The consequences of this are as follows:
While the engines of fuel-injected cars as a general rule cannot be flooded unless they are somehow out of spec, you may find that you are getting slight flooding. This is worst-case. If you are running higher fuel pressure than normal, fuel injector output may increase, causing you to run rich. Running rich isn't the worst thing on earth, but it can rob your car of power in the short term , flood your spark plugs and render your catalytic converter useless in the long term (if you have too much unspent fuel in the exhaust stream).
I ran with larger injectors and a larger fuel pump for a couple weeks. There is a definite difference, but not a particularly GOOD one in my case.
11-04-2006, 04:16 PM
#3
Originally Posted by RichMax
Well...
Depending on which walbro pump you get (there are multiple variants that can go in a Max) you may have higher base fuel pressure than normal. The consequences of this are as follows:
While the engines of fuel-injected cars as a general rule cannot be flooded unless they are somehow out of spec, you may find that you are getting slight flooding. This is worst-case. If you are running higher fuel pressure than normal, fuel injector output may increase, causing you to run rich. Running rich isn't the worst thing on earth, but it can rob your car of power in the short term , flood your spark plugs and render your catalytic converter useless in the long term (if you have too much unspent fuel in the exhaust stream).
I ran with larger injectors and a larger fuel pump for a couple weeks. There is a definite difference, but not a particularly GOOD one in my case.
Depending on which walbro pump you get (there are multiple variants that can go in a Max) you may have higher base fuel pressure than normal. The consequences of this are as follows:
While the engines of fuel-injected cars as a general rule cannot be flooded unless they are somehow out of spec, you may find that you are getting slight flooding. This is worst-case. If you are running higher fuel pressure than normal, fuel injector output may increase, causing you to run rich. Running rich isn't the worst thing on earth, but it can rob your car of power in the short term , flood your spark plugs and render your catalytic converter useless in the long term (if you have too much unspent fuel in the exhaust stream).
I ran with larger injectors and a larger fuel pump for a couple weeks. There is a definite difference, but not a particularly GOOD one in my case.
11-04-2006, 06:43 PM
#6
gains, no. But if you wanted to run one I recommend getting an AFPR to bring the FP back down to 3 bar. Chances are the new one will raise the pressure slightly so the new regualtor will fix that. (shameless plug: I can get you an AFPR for $40).
11-04-2006, 07:05 PM
#7
Originally Posted by nismology
The stock pump is good for over 250 WHP so you're not even close to maxing it out.
11-04-2006, 08:38 PM
#8
Senior Member
Join Date: Dec 2005
Posts: 301
I just put in a "Master" fuel pump. Made in Japan, $170.
This pump puts out. I feel a big improvement in HP.
My 2c. if you change the fuel pressure then you need a new code on the ECU. The stock ECU assumes a fuel pressure of 35lbs in all it's injector and timing computations. If you up the pressure then you fool the ECU into running rich.
But all you're really doing is working the cr@p out of the pressure regulator. Has anyone measured a pressure increase?
This pump puts out. I feel a big improvement in HP.
My 2c. if you change the fuel pressure then you need a new code on the ECU. The stock ECU assumes a fuel pressure of 35lbs in all it's injector and timing computations. If you up the pressure then you fool the ECU into running rich.
But all you're really doing is working the cr@p out of the pressure regulator. Has anyone measured a pressure increase?
11-04-2006, 08:43 PM
#10
Originally Posted by xlr8r
I just put in a "Master" fuel pump. Made in Japan, $170.
This pump puts out. I feel a big improvement in HP.
My 2c. if you change the fuel pressure then you need a new code on the ECU. The stock ECU assumes a fuel pressure of 35lbs in all it's injector and timing computations. If you up the pressure then you fool the ECU into running rich.
But all you're really doing is working the cr@p out of the pressure regulator. Has anyone measured a pressure increase?
This pump puts out. I feel a big improvement in HP.
My 2c. if you change the fuel pressure then you need a new code on the ECU. The stock ECU assumes a fuel pressure of 35lbs in all it's injector and timing computations. If you up the pressure then you fool the ECU into running rich.
But all you're really doing is working the cr@p out of the pressure regulator. Has anyone measured a pressure increase?
11-04-2006, 09:14 PM
#11
Originally Posted by nismology
None of what you said here makes any sense or is correct. I don't even know where to start...
I am DEFINITELY going to have to go with him on this one
Bosch makes replacements IIRC... Our stock fuel pumps aren't exactly the most unreliable on earth. Are you replacing it because you want to mod the car (e.g., add air a la FI, etc), or what? I agree with what the others have said- unless your application requires MORE fuel than stock, upgrading to a higher-pressure pump in is overly costly at best and foolhardy at worst- for a near-stock N/A application you will need ADDITIONAL hardware to LOWER fuel pressure back down to stock levels.
AutoBlown and PepGirls carry replacement pumps as well.
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