I am dropping fuel pressure at WOT above 17lbs of boost. I currently have the RX7.com fuel pump (which Ari said its good to 500hp), Aeromotive FPR, and 1600cc secondaries. I am using stock fuel lines and stock primaries. What should I do? Could I do this.....





I have a brand new fuel pump from the rx-7store.net extreme fuel system that I did not use. Could I use this fuel pump for my primaries, and use the RX7.com pump for my secondaries by using the carbon return line (cleaned out)? Its not being used anyways now. That way I could avoid runing bigger fuel lines and saves a bunch of money. Does anybody see anything wrong with this? I saw a FD at NHRA running 10's that used this set up. I probably would upgrade my primaries to 850's unless it would not offer any help.



My setup on 93 FD3S R1

Atkins 13B 3mm, Cryo frozen, Water jacket mod, Clearance rotors

A-spec GT35/40

Power FC w/ datalogit

Greddy 2 row FMIC

Fluidyne radiator



BDC tuned to 17lbs...but would like to go to 25-28lbs if tuning allows

By the way...don't hold it agaist me that I'm a good friend of Sinful7's!

You must increase the size of your lines. The stock lines cannot flow what you need.

Hahha Mike, anybody that gets along with Steve-O is going to be relentelessy persecuted.

you're steve's friend? damn.... that means everyone wants you out of here as much as everyone wants him out... j/k



alright few things, check the voltage that your fuel pumps are getting, second check for obstructions in the line, like clogged fuel pump, clogged strainers before the fuel pump ( i had this problem), then, check if all the hoses are clamped down, (i didnt clamp down the hoses from the pump to the metal hoses and seemed like , as the fuel got warm and the fuel lines got more flexible, they would kink and spray where there is less pressure, which is within the tank). then, check the fuel pressure regulator itselt, try to get a hold of someone else's which you know works properly. treceb had that problem, and fortunately i had an extra regulator for him to test out.



i'd take care of this fuel issue before you use all that power man.... if your fuel pressure drops more than it is now, you might get lean and blow

[quote name='qwester007' date='Aug 29 2005, 03:02 PM']You must increase the size of your lines. The stock lines cannot flow what you need.


[/quote]



although its always a good thing, i dont think that is his problem..





oh yeah.... check the bottom of your car. sometimes when our cars bottom out on a steep curb, or a big pothole they would get kinked or squished, making them narrower than they already are.



good luck

if you run dual feed lines, you can keep the stockers in place.



I have two pumps, feeding the stock feed and return lines. The stock emissions fume line is used for the return and I have eliminated teh charcole canister and related components

Thats exactly what I was hoping to do....I figured that is a cheap way to double the size of my fuel lines. Just seeing who has tried it and how much HP they acheived.

[quote name='MichaelB145' date='Aug 30 2005, 12:48 AM']Thats exactly what I was hoping to do....I figured that is a cheap way to double the size of my fuel lines. Just seeing who has tried it and how much HP they acheived.


[/quote]





ill tell you after i get my car tuned https://www.nopistons.com/forums/pub...IR#>/smile.png

[quote name='MichaelB145' date='Aug 30 2005, 02:48 PM']Thats exactly what I was hoping to do....I figured that is a cheap way to double the size of my fuel lines. Just seeing who has tried it and how much HP they acheived.


[/quote]

There are quite a few people running that setup with good results.

Have you ever heard to use a second FPR?

2 regulators are not needed if you are using an aeromotive unit... actually 2 regulators will probably bring your fuel pressure lower. remember the regulator restricts the return to increase fuel pressure, kinda like you sqeezing the return line or clamping it.



actually why dont you try that... get a vice grip and clamp your return line (pick a spot where you have rubber lines, not the -an ones) see if your fuel pressure goes up really high. if it goes up, i guess you would have a fuel pressure regulator problem, and if it doesnt, its more the delivery(pump, lines, filter, strainer).



you do have the fpr after the rails right?

I'm pretty sure it's not the FPR itself cuz I swapped it with another one and it did the same thing (drop fuel pressure from 60 down to 40 under full boost). As far as where it's installed...I don't remember but it was at the same location the stock fpr was installed. Does it make huge difference?

Increase the size of your lines with a good one regulator and a good one fuel pump.

If you run at high boost psi (30 + psi) use dual fuel lines, dual regulator and dual pump.



This probably helps you a lot...





http://www.weldonracing.com/

[quote name='MichaelB145' date='Aug 30 2005, 10:45 AM']I'm pretty sure it's not the FPR itself cuz I swapped it with another one and it did the same thing (drop fuel pressure from 60 down to 40 under full boost). As far as where it's installed...I don't remember but it was at the same location the stock fpr was installed. Does it make huge difference?


[/quote]





the stock fpr is setup for a 1 feed line that goes through both rails.... fuel enters the primary fuel rail from the back of the motor, goes through it, exits on the front part of the motor, then enters the secondary rails from the front of the motor, then exits by the fuel pressure regulator towards the back fo the motor.









this wont work for you if you are using 2 feed lines. fuel has to come in one side, and exit on the other end, and meet at the fuel pressure regulator.



would you mind taking a picture of your system?

the dual pump setup will work. i went overkill on my FD sumped tank, ss an lines from the tank to the weldon external filter and external sx pump to sx fpr on the fuel rail.......never had a fuel problem but it cost so much money

i need to sump my tank...



damn cars are so expensive

[quote name='rfreeman27' date='Aug 30 2005, 10:41 PM']i need to sump my tank...



damn cars are so expensive


[/quote]



buy mine! i still have it



already sumped do it now!

[quote name='vosko' date='Aug 30 2005, 09:43 PM']buy mine! i still have it



already sumped do it now!


[/quote]



will it fit an 89t2?



kevin.

My set up is pretty common....RX7.com fuel pump, aeromotive FPR, 1600cc injectors. I figured that set up would be good to 500hp....I quit working for me at about 430 hp.