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Subject: "Fuel Pump Rewire Mod Questions"

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TXrepresent	Jan-10-04 11:51 AM
Member since Jun 24th 2003 541 posts,

#66269, "Fuel Pump Rewire Mod Questions"

Would I benifet from this mod even though I'm not using a turbo or nitrous? Or would it do nothing, or even hurt me. By the way I'm a '95 with no fpr, and an automatic. See my mods below. I'm just wondering because I have an extra 20 feet of 8 guage wire lying in my garage.

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Replies to this topic

RE: Fuel Pump Rewire Mod Questions, jsupetran, Jan-10-04 01:54 PM, #1

RE: Fuel Pump Rewire Mod Questions, fly1, Jan-10-04 03:45 PM, #2

RE: Fuel Pump Rewire Mod Questions, TXrepresent, Jan-10-04 03:49 PM, #3

RE: Fuel Pump Rewire Mod Questions, tim97rs, Jan-10-04 04:35 PM, #4

RE: Fuel Pump Rewire Mod Questions, Team

Team

DR1665, Jan-10-04 05:24 PM, #5

RE: Fuel Pump Rewire Mod Questions, Diceman19, Jan-10-04 05:42 PM, #6

RE: Fuel Pump Rewire Mod Questions, ajna_star, Jan-10-04 07:13 PM, #7

RE: Fuel Pump Rewire Mod Questions, TXrepresent, Jan-11-04 04:18 AM, #8

RE: Fuel Pump Rewire Mod Questions, Team

Team

DR1665, Jan-11-04 06:13 AM, #9

Here is the Answer..., Skrilla, Jan-11-04 07:18 AM, #10

RE: Here is the Answer..., TXrepresent, Jan-11-04 08:05 AM, #11

RE: Here is the Answer..., Moderator

Moderator

Corbin, Jan-12-04 05:40 AM, #12

RE: Here is the Answer..., TXrepresent, Jan-12-04 07:24 AM, #13

RE: Here is the Answer..., thedawg, Jan-12-04 08:15 AM, #14

RE: Here is the Answer..., TXrepresent, Jan-12-04 08:40 AM, #15

RE: Here is the Answer..., sd240, Jan-12-04 01:31 PM, #16

RE: Here is the Answer..., Diceman19, Jan-12-04 01:48 PM, #17

Alternator Overdrive Pully, TXrepresent, Jan-12-04 03:34 PM, #18

RE: Alternator Overdrive Pully, djtrickee, Jan-12-04 05:49 PM, #19

RE: Alternator Overdrive Pully, TXrepresent, Jan-13-04 01:29 AM, #20

RE: Alternator Overdrive Pully, djtrickee, Jan-13-04 07:12 AM, #21

RE: Alternator Overdrive Pully, a_miller_76, Jan-13-04 07:55 AM, #22

RE: Alternator Overdrive Pully, TXrepresent, Jan-13-04 08:27 AM, #23

RE: Alternator Overdrive Pully, djtrickee, Jan-13-04 11:08 AM, #24

RE: Here is the Answer..., Moderator

Moderator

Corbin, Jan-14-04 05:42 AM, #25

jsupetran	Jan-10-04 01:54 PM
Member since May 04th 2002 4359 posts,

#66280, "RE: Fuel Pump Rewire Mod Questions"
In response to Reply # 0

i don't think you notice a difference hp wise. You still need to buy a relay, crimps, and other stuff, like a soldering gun.

-------jezreel
hrc stage 1, sfmu, ml, prokits, egt, boost gauge, apexi tt, costum dp, dynotune fp gauge. gst muff, turbo spoiler

nothing like driving with the windows down and the music low: i love hearing the turbo spool, swwwhhhttt!!!!
thanks for www.kaptainmyke.com for the sig hosting

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fly1	Jan-10-04 03:45 PM
Donating 2GNT member 1470 posts,

#66288, "RE: Fuel Pump Rewire Mod Questions"
In response to Reply # 0

Truthfully, I don't think you'll benefit any from the rewiring mod with your current setup. It wouldn't hurt anything, but it should ensure a strong +12V supply.

___________
Kon C

"Sometimes, a man has to do what a man has to do."

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TXrepresent	Jan-10-04 03:49 PM
Member since Jun 24th 2003 541 posts,

#66290, "RE: Fuel Pump Rewire Mod Questions"
In response to Reply # 2
Jan-10-04 03:49 PM by TXrepresent

Well, might as well do it then, huh? Can't hurt anything.

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tim97rs	Jan-10-04 04:35 PM
Donating 2GNT member 4255 posts,

#66293, "RE: Fuel Pump Rewire Mod Questions"
In response to Reply # 3

i have heard about this mod, but whats the benefit and when do you see it?

USED TO HAVE...Everything you wish you had, and then some...

You are somebody special Tim, you matter! - from the admins (but nobody likes you, because your username is just like that other guy's, and you whine a lot)

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DR1665	Jan-10-04 05:24 PM
Donating 2GNT member 14692 posts,

#66294, "RE: Fuel Pump Rewire Mod Questions"
In response to Reply # 4

Of course, you could also do this and hook up a nice little fuel cut switch sir. Make the car harder to "borrow."

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Diceman19	Jan-10-04 05:42 PM
Donating 2GNT member 4629 posts,

#66298, "RE: Fuel Pump Rewire Mod Questions"
In response to Reply # 4

Originally posted by tim97rs
i have heard about this mod, but whats the benefit and when do you see it?

the benefit is when there is load placed on your fuel pump, it will drop the voltage that gets to it and it will not pump as much fuel. when it has a steady voltage, it will run at its peak effiency all the time. it is the same theory as when you have subs and your lights dim. the subs are pulling power from the electrical system and if they pull to much, it pulls from other stuff to get what it wants. you would "see" it all the time. you wouldnt have to worry about running lean under heavy load situations like WOT because the pump cant pump enough. emoji

___________________________________________

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ajna_star	Jan-10-04 07:13 PM
Donating 2GNT member 5730 posts,

#66311, "RE: Fuel Pump Rewire Mod Questions"
In response to Reply # 6

it wouldnt make you ru any richer, would it?

2005 Corolla XRS
2ZZ 6-speed

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TXrepresent	Jan-11-04 04:18 AM
Member since Jun 24th 2003 541 posts,

#66326, "RE: Fuel Pump Rewire Mod Questions"
In response to Reply # 7

^^^ That is the problem I'm worring about. I hope it doesn't make me any richer. I think it wouldn't though, but I need clarification. I was thinking of doing this fuel pump rewire mod, wrapping my header and down pipe in exhaust insulator, and maybe adding a new OBX fuel rail all at once. I was hoping for some cheap horsepower. But then I found out I wouldn't benifet from the fuel rail, or the fuel pump rewire mod. So I guess I'll just do the exhaust wrapping only.

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DR1665	Jan-11-04 06:13 AM
Donating 2GNT member 14692 posts,

#66335, "RE: Fuel Pump Rewire Mod Questions"
In response to Reply # 8

If you'd like to pick up a few extra ponies, you ought to look into getting a Jeep tb or maybe porting your own one out a bit. Definitely makes for some decent zip when you jump on the gas.

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Skrilla	Jan-11-04 07:18 AM
Donating 2GNT member 1868 posts,

#66343, "Here is the Answer..."
In response to Reply # 0

Originally posted by TXrepresent
Would I benifet from this mod even though I'm not using a turbo or nitrous? Or would it do nothing, or even hurt me. By the way I'm a '95 with no fpr, and an automatic. See my mods below. I'm just wondering because I have an extra 20 feet of 8 guage wire lying in my garage.

...unless you need the extra fuel, because at this point you don't, do not do the rewire. Our cars run rich as it is and the rewire will make it even worse and - here it comes - you will lose power from running too much fuel. If you do the rewire then pick up an AFC and voltmeter then drop 15%+ fuel...end of story

*Skrilla
"Honest officer, I thought you were trying to race me"
Talon: 1st 2.4L
'97 Prelude
'04 350Z

Originally posted by YourInMyMirror95GS
dick teaser's should be rounded up and shot in the forehead

Originally posted by etx
Good luck man! Project 'STFU Brian your talon is dead meat' should be on it's feet soon! emoji

Originally posted by Dark0ne
Thanks. Now excuse me while i fuck your sister.

"fuck all motor" -turbo ate you

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TXrepresent	Jan-11-04 08:05 AM
Member since Jun 24th 2003 541 posts,

#66346, "RE: Here is the Answer..."
In response to Reply # 10

It shouldn't make us run any richer because our cars were designed for the full power of the fuel pump. But if someone knows from experience, that would be very helpful.

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Corbin	Jan-12-04 05:40 AM
Donating 2GNT member 2552 posts,

#66385, "RE: Here is the Answer..."
In response to Reply # 11

On a car that is running within the limitations of its fuel system...rewiring the fuel pump won't make you run any richer. It will likely supply more voltage to the pump. If you are supplying more voltage to the pump, it will spin faster. When the pump spins faster, it supplies more fuel. The fuel pressure regulator will respond to this by bypassing more fuel. The fuel pressure regulator will maintain the fuel pressure. The fuel injectors don't care how much extra fuel is shooting past them. All they care about is the air pressure in the intake manifold runner and the fuel pressure in the fuel rail. They will supply the same amount of fuel as long as manifold pressure and fuel pressure are maintained, even if you increase fuel pump flow.

Corbin

'95 ESI-T
HRC+FMIC+ETC...

Gimme fuel...Gimme fire...Gimme that which I desire

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TXrepresent	Jan-12-04 07:24 AM
Member since Jun 24th 2003 541 posts,

#66387, "RE: Here is the Answer..."
In response to Reply # 12

^^^ NOW THAT IS THE ANSWER I'M LOOKING FOR. But one problem, 1995 models don't have a fuel pressure regulator. And I'm a '95! So does this mean it will add more fuel to the mixture?

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thedawg	Jan-12-04 08:15 AM
Donating 2GNT member 6287 posts,

#66394, "RE: Here is the Answer..."
In response to Reply # 13
Jan-12-04 08:18 AM by thedawg

Actually the 1995's DO have a fuel pressure regulator, its just in a different spot.

The problem is that 1996+ don't have a RETURN. I think you could overrun a returnless FPR if you feed it too much pressure? Corbin care to esplain? thanky.

1995 fuel system:

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TXrepresent	Jan-12-04 08:40 AM
Member since Jun 24th 2003 541 posts,

#66396, "RE: Here is the Answer..."
In response to Reply # 14

Well, thats good. Looks like I'm going to do the mod this weekend

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sd240	Jan-12-04 01:31 PM
Member since May 25th 2003 298 posts,

#66411, "RE: Here is the Answer..."
In response to Reply # 15

Off topic here, but I read your mod list and saw the overdrive pully for your alternator. Does that help, and where did you get it? Thanks.

93 Tsi AWD-SAFC I, Apexi N1 turbo back, MBC, K&N w/ hacked can,
Walbro 255, Accel wires, 650cc injectors, stage 3 dsmchip

97 Neon ACR-Stock

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Diceman19	Jan-12-04 01:48 PM
Donating 2GNT member 4629 posts,

#66412, "RE: Here is the Answer..."
In response to Reply # 16

since he has the under drive pulley, his alternator doesnt get as much umph. the overdrive pulley for the alternator makes it work "harder" so that it keeps the batt charged.

___________________________________________

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TXrepresent	Jan-12-04 03:34 PM
Member since Jun 24th 2003 541 posts,

#66420, "Alternator Overdrive Pully"
In response to Reply # 17
Jan-12-04 03:35 PM by TXrepresent

^^^He has the right idea on how it works. But I had a very light weight custom one made for me. It made a pretty good difference, and still doesn't take any horsepower away!

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djtrickee	Jan-12-04 05:49 PM
Donating 2GNT member 5924 posts,

#66429, "RE: Alternator Overdrive Pully"
In response to Reply # 18

Originally posted by TXrepresent
^^^He has the right idea on how it works. But I had a very light weight custom one made for me. It made a pretty good difference, and still doesn't take any horsepower away!

Wait a second... if you have an UNDER (smaller diameter) drive pulley on the crank... and an OVER (larger diameter) drive pulley on the Alternator then you are getting even less power from it then with only the underdrive. Its probably hardly spinning at all.

Consider this...
A bicycle, a 10 speed, the front is where you pedal, this equates to the Crank. The rear wheel where the power is transfered equates to the alternator.
If you are riding along and you shift to the smaller chainring on the front it is easier to pedal ie less power being transfered.
Now if you are riding and you shif to a larger ring in the back it has the same effect... less power being transfered, ie UNDER driven...
So if you shift to a smaller chainring on the front AND a larger ring in the back then you are getting major underdrive...

SEE??

The only way to retrieve lost power at the alternator would be to use a smaller diameter pulley there... defeating the main purpose of an underdrive pulley.
Now a lighter weight stock diameter pulley would be sweet for the alternator.

.........................................................................................................................

Built. That's All...
.........................................................................................................................
www.monkeybuttpirate.com
.........................................................................................................................
2 Fingers of Scotch with a milk back... Stat!

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TXrepresent	Jan-13-04 01:29 AM
Member since Jun 24th 2003 541 posts,

#66437, "RE: Alternator Overdrive Pully"
In response to Reply # 19
Jan-13-04 01:30 AM by TXrepresent

It is the stock size, except as I mensioned earlier, it is very light weight emoji

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djtrickee	Jan-13-04 07:12 AM
Donating 2GNT member 5924 posts,

#66451, "RE: Alternator Overdrive Pully"
In response to Reply # 20

hey whats that smiley for... I wasnt dissin on you, I was trying to clear up how underdrive/overdrive works hehe.

I want one of those pulleys stock size but way lighter. Think you could get another one made? I am serious about it.

Hit me up on chat or email. Lets make it happen.

.........................................................................................................................

Built. That's All...
.........................................................................................................................
www.monkeybuttpirate.com
.........................................................................................................................
2 Fingers of Scotch with a milk back... Stat!

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a_miller_76	Jan-13-04 07:55 AM
Donating 2GNT member 9515 posts,

#66455, "RE: Alternator Overdrive Pully"
In response to Reply # 21

Originally posted by djtrickee
hey whats that smiley for... I wasnt dissin on you, I was trying to clear up how underdrive/overdrive works hehe. I want one of those pulleys stock size but way lighter. Think you could get another one made? I am serious about it. Hit me up on chat or email. Lets make it happen.

fuck it, get a bunch made and do a group buy

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TXrepresent	Jan-13-04 08:27 AM
Member since Jun 24th 2003 541 posts,

#66456, "RE: Alternator Overdrive Pully"
In response to Reply # 22

The guy who made it, Gerald, said it was a pain in the ass. But I'm sure he would do more for the money.

By the way, djtrickee, I was just joking about the smiley face thing. I thought someone would say "owned," like they normally do. HA HA emoji

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djtrickee	Jan-13-04 11:08 AM
Donating 2GNT member 5924 posts,

#66460, "RE: Alternator Overdrive Pully"
In response to Reply # 23

OWNED!! (is that better)

Can you find out how much it was to make that pulley? Hit me up on chat or email if you wouldnt mind.

Thanks bro,

.........................................................................................................................

Built. That's All...
.........................................................................................................................
www.monkeybuttpirate.com
.........................................................................................................................
2 Fingers of Scotch with a milk back... Stat!

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Corbin	Jan-14-04 05:42 AM
Donating 2GNT member 2552 posts,

#66522, "RE: Here is the Answer..."
In response to Reply # 14

All years have fuel pressure regulators and return lines.

1995 cars have vacuum referenced fuel pressure regulators. Which means that they change fuel pressure based on intake manifold pressure. Thus, the injectors can supply the same amount of fuel at idle and wide open throttle. The 1995 cars have a prominent return line that comes from the fuel rail and runs the length of the car back to the gas tank.

1996+ cars have a fixed fuel pressure regulator. That means that the fuel pressure stays fixed whether you are at idle or wide open throttle. That also means that the injectors can supply more fuel at idle than at wide open throttle. The ECU knows this and adjusts accordingly. 1996+ cars technically do have a fuel return line. It is just very short and hidden by the gas tank. If you look at your fuel pump assembly, there is a high pressure feed fitting AND a low pressure return fitting. The return is where the return line hooks in (makes sense).

Corbin

'95 ESI-T
HRC+FMIC+ETC...

Gimme fuel...Gimme fire...Gimme that which I desire

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