[Newtgadget]

Can someone explain the advantage of running 2 fuel pumps.....specifically an upgraded in tank pump an an in line pump?

my understanding is that the fuel pump is variable speed controlled by the computer...in other words, apply more voltage, spins faster, more fuel output.

How does the second in line pump work in conjunction with the in tank pump?

Thanks in advance!
Newt

[White Thunder]

umm i don't know just buy a 255 walbro

[Newtgadget]

Originally Posted by White Thunder umm i don't know just buy a 255 walbro

Already have the 255 installed in the tank. We are looking into a procharger and they recommend an in line pump to work in conjunction with the 255 in tank pump.

[Goblin]

Originally Posted by Newtgadget Can someone explain the advantage of running 2 fuel pumps.....specifically an upgraded in tank pump an an in line pump? my understanding is that the fuel pump is variable speed controlled by the computer...in other words, apply more voltage, spins faster, more fuel output. How does the second in line pump work in conjunction with the in tank pump? Thanks in advance! Newt

Umm, what year car and ECU are you running? EEC-IV controlled engines dont have varible pump voltage to control fuel flow or pressure like the EEC-V returnless systems do. They use a static pump voltage, and fuel pressure is controlled with a rail mounted, or remote regulator. The idea of second pump, is to increase the volume of fuel.. without changing the fuel line size (atleast thats what the idea used to be). The best way to increase fuel volume, is to increase the pumps volume capability (larger pump) and then use a larger diameter line. An extra pump will further increase volume (with the previous varibles in place).. and help to support more power.

[Newtgadget]

Originally Posted by Goblin Umm, what year car and ECU are you running? EEC-IV controlled engines dont have varible pump voltage to control fuel flow or pressure like the EEC-V returnless systems do. They use a static pump voltage, and fuel pressure is controlled with a rail mounted, or remote regulator. The idea of second pump, is to increase the volume of fuel.. without changing the fuel line size (atleast thats what the idea used to be). The best way to increase fuel volume, is to increase the pumps volume capability (larger pump) and then use a larger diameter line. An extra pump will further increase volume (with the previous varibles in place).. and help to support more power.

The car is an 88 gt, 347, converted from SD to mass air, 5 speed. All the bolt ons and we are at the crossroads of installing the Zex kit or procharger.
After i spoke to the procharger rep, I was confused because i have the regulator at the rail. To me, this is a constant pressure pump, and installing a second in line pump will only add more heat to the fuel while possibly increasing the pressure only if the in tank pump supplies an excess volume.
I would think the fuel lines need to be upsized as well.

[Goblin]

Originally Posted by Newtgadget The car is an 88 gt, 347, converted from SD to mass air, 5 speed. All the bolt ons and we are at the crossroads of installing the Zex kit or procharger. After i spoke to the procharger rep, I was confused because i have the regulator at the rail. To me, this is a constant pressure pump, and installing a second in line pump will only add more heat to the fuel while possibly increasing the pressure only if the in tank pump supplies an excess volume. I would think the fuel lines need to be upsized as well.

Correct. In order to get MORE fuel, you absolutely need a bigger fuel feed line. The extra "booster" pump wont do much of anything except increase pressure, and yes, heat the fuel. If you go with the procharger, consider changing to an -8an feed line, and a -6 return. Also, i would spend the money on a decent set of fuel rails, and good fittings... along with an adjustable fuel pressure regulator.

If your trying to decide on a power adder, and the ZEX and Procharger are your candidates.. i would probably go with the ZEX system. Cheaper, and can provide the same gains the supercharger will, and is much easier to install and tune. Is the ZEX system wet, or dry?

[Newtgadget]

Originally Posted by Goblin Correct. In order to get MORE fuel, you absolutely need a bigger fuel feed line. The extra "booster" pump wont do much of anything except increase pressure, and yes, heat the fuel. If you go with the procharger, consider changing to an -8an feed line, and a -6 return. Also, i would spend the money on a decent set of fuel rails, and good fittings... along with an adjustable fuel pressure regulator. If your trying to decide on a power adder, and the ZEX and Procharger are your candidates.. i would probably go with the ZEX system. Cheaper, and can provide the same gains the supercharger will, and is much easier to install and tune. Is the ZEX system wet, or dry?

We purchased the Zex system and all the bolt ons around a month and a half ago in order to work on the car over the winter. The Zex system is a wet system and I have the BBK anodized blue fuel rails with built in adj. regulator.

attached is a pict of all the components we will be installing over the winter.

[Goblin]

Originally Posted by Newtgadget We purchased the Zex system and all the bolt ons around a month and a half ago in order to work on the car over the winter. The Zex system is a wet system and I have the BBK anodized blue fuel rails with built in adj. regulator. attached is a pict of all the components we will be installing over the winter.

I dont see a picture. And what kind of system is it? A spray bar/plate? Single Nozzle? What kind of jetting are you going to use?

[Newtgadget]

Originally Posted by Goblin I dont see a picture. And what kind of system is it? A spray bar/plate? Single Nozzle? What kind of jetting are you going to use?

Nozzle system and i'm unsure of the jetting as of yet. I am taking this build step by step as I had a lot of learning to do since I took the car back from my son. lot's of research and plenty of questions asked and answered here.

let me try the pict again

[Goblin]

Originally Posted by Newtgadget Nozzle system and i'm unsure of the jetting as of yet. I am taking this build step by step as I had a lot of learning to do since I took the car back from my son. lot's of research and plenty of questions asked and answered here. let me try the pict again

Looks like a good set of parts. How much nitrous do you "want" to use? How much additional HP are you shooting for? I just want to give you a heads up... single nozzle wet, and wet spraybar/plate systems that mount behind the throttle body, or spray in front of the throttle body are prone to backfires and nitrous explosions when used with high levels of nitrous.

[Newtgadget]

Originally Posted by Goblin Looks like a good set of parts. How much nitrous do you "want" to use? How much additional HP are you shooting for? I just want to give you a heads up... single nozzle wet, and wet spraybar/plate systems that mount behind the throttle body, or spray in front of the throttle body are prone to backfires and nitrous explosions when used with high levels of nitrous.

We are setting the car up for my wife to run the 12 second class this spring. i want to get it to run mid to low 11's and back it off for her to stay competitive in the 12 second class.

Since this is a stock block, I am shooting for around 500hp. Stroker I've been told is about 350-365 hp, twisted wedge heads with the correct bolt ons baybe another 50, so i'm thinking about 100 shot.

[Goblin]

Originally Posted by Newtgadget We are setting the car up for my wife to run the 12 second class this spring. i want to get it to run mid to low 11's and back it off for her to stay competitive in the 12 second class. Since this is a stock block, I am shooting for around 500hp. Stroker I've been told is about 350-365 hp, twisted wedge heads with the correct bolt ons baybe another 50, so i'm thinking about 100 shot.

If its a stock block.. it wont live forever at 500hp. Depending on how the car is setup with suspension, weight.. and with good driver skills, 500hp is enough for 10s. I would really consider.. and this is just a suggestion.. selling the ZEX wet system, and investing in a good single nozzle dry system. Dry is the safest, and best way to inject Nitrous with EFI on a budget. Ive been running Nitrous on and off for about 5 years.. and ive used different styles of systems, and so far the single nozzle dry setups have given me the best results with EFI. Just some food for thought. Read up a little more on here, and on the net. Lots of great info all over the place.

[Newtgadget]

Originally Posted by Goblin If its a stock block.. it wont live forever at 500hp. Depending on how the car is setup with suspension, weight.. and with good driver skills, 500hp is enough for 10s. I would really consider.. and this is just a suggestion.. selling the ZEX wet system, and investing in a good single nozzle dry system. Dry is the safest, and best way to inject Nitrous with EFI on a budget. Ive been running Nitrous on and off for about 5 years.. and ive used different styles of systems, and so far the single nozzle dry setups have given me the best results with EFI. Just some food for thought. Read up a little more on here, and on the net. Lots of great info all over the place.

I appreciate it. this is a car that my son and his friends were building and i was funding that is until they blew their 2nd 302. I took the car back and had the stroker done and ordered the bolt ons for my wife to race.

The reason i am asking the fuel questions for the procharger is because I am building another motor for my project car which I intend on running supercharged. I was possibly thinking about putting it on my wifes car to work out the problems before I installed it on my high dollar motor to work out any bugs.