Can you remove the Fuel Pulsation Dampner for good?
 

There seems to be alot of talk about this piece lately and I haven't read anywhere that you can just get rid of it all together. I've got all the mods done that you can name....so it isn't needed right?

I know in the Supra's you remove it and it adds HP....it would be the same for the 7 right? I'm just asking because I'm still learning about the 7's moody nature. I don't want to do anything to piss her off if i don't have to....plus i just ordered a shit load of Earls fittings for the whole fuel system from front to back. I'm putting two intank pumps,SX FPR,SX fuel filter moved to the engine bay with all new lines. I want to get rid of everything that i possibly can to make it easier and more efficient.

Thank-you to anyone that can help:D

I was wondering the same thing myself. I'm sure the typical two camps will arise..."Mazda wouldn't have put it in if you didn't need it" and "I took mine out with no problems.."

MastaCow at the disco!!!!!!! lol

great pic.

I am curious if anyone has done this as well, I bet the guys in the single turbo section have done it with their fuel system upgrades. I removed it on my Supra when I made all the SS lines and had no adverse effects at all, other than the car running a bit more rich than before. BTW.. does anyone know what size Earl's fittings are needed in the fuel rails on the FD? I plan on doing SS lines and a relocation of the fuel filter when I actually get to dropping the fuel tank and upgrading the pump.

Matt
93 SSM

well it is used to stop the flow irregularity that causes the fuel pump so i suppose removing it will make the injectors have some high and ups in the fuel pressure. I wouldn't do it personnaly. It might not be that bad but...

puma

I'm going ahead with it anyway...I'll let everyone know how it goes. I changed both fuel rails around so that it's all Earl's fittings w/SS lines. It looks beautiful! It's coming together rather nicely I must say:D

Forgive the newbie-like ignorance, but wtf does the FPD actually do, other than leak and cause engine fires? What's it's official purpose, and how does it work?

Inquiring minds want to know!

Patrick

i think that is pretty much all it is good for.

would it be safe to take it out without any fuel upgrades first?

Well, I would say it would be safe to do so.. not too smart though. By the time you are in there enough to take it off you may as well make some nice SS lines and install an AFPR, otherwise it seems like a waste of time to me. I don't know why I haven't heard of more people doing this, with as hot and the engine bay gets.. on that side especially, it makes perfect sense to me to ditch the stock setup and go with SS lines and no pulsation dampener. I plan on doing this, no engine fire worries for me then.

Matt
93 SSM

SanJoRX7, it's not ignorant. You are looking for information by inquiring rather than ignoring.
The Fuel Pulsation Dampener (FPD) smoothes out the pulses that the Fuel pump generates as part of it's normal operation. By pulses, I'm referring the the peaks and valleys of pressure. The fuel pump does not generate a constant amount of pressure, this means that if you didn't have an FPD then some of your engine cycles will have recieved less fuel then others. This shouldn't really be a problem because the rises and drops of pressure generated by the fuel pump are not great enough to have any significant effect on the engine's performance or operation.
My question is: Why can't you just move the FPD closer to the fuel pump and away from the engine so that you can have the best of both worlds?

The FPD smothes the pressure waves caused by the OPERATION OF THE INJECTORS more than any flucations from the FUEL PUMP. Moving or removing the FPD is a BAD idea.

i thought that you can take out the pulsation damper whe you install new fuel rail, larger injectors and fuel pressure regulator.

Why is it such a bad idea? Does anyone have data to back this up? Any experiences? I am open to anything, I just don't see how the fuel system on the FD is that much different than many other cars I have done. I saw no adverse affects other than running at tad more rich than before at times, but that is what PFC or other electronics are for. At this point I am not convinced that it is a BAD idea, it is in fact probably a restriction just like it is in the Supra's fuel system. What could it potentially harm or cause?

Matt
93 SSM

I can't imagine a FPD being any different from car to car. The more I've looked around the more convinced I am of doing it.....I can't find any reason for it to be there on a modified car with aftermarket electronics. I'm designing my fuel system for a high HP car with aftermarket electronics so it should do OK....if not then I'll let you know. I'm getting more and more excited as I work on my fuel system....it's looking really sweet!:mspank:

If anyone is feeling particularly helpful, would you mind posting with the specific parts for upgrading all the lines to ss braided lines and what in-line fuel filter you used. I'm planning on doing this, but don't know where to start for parts.

I really want to know this..

You can use any of the "quality" fuel filters out there....Paxton,Aeromotive,SX,etc.... also the fittings are the same thing.....XRP,Earls,Aeroquip,Russell. I'm using all -6an lines from front to rear.

I've already removed the FPD....it doesn't really do much of anything....so there's no need to have it (this is only my opinion). I will post some of my pics when I'm done and it all works good..

Just so you know.....it's gonna cost you alot of money to do this. I've got $500 just in fittings right now and I'm not even done.....found 10 more things to change to alum. fittings and SS. I don't want anything but these kind of fittings when I'm done:cool:

I have an idea... how about a write-up ;) If you could make up a shopping list and a short how-to, alot of people would be glad to get rid of the FPD and upgrade their lines.

ok well heres a quick way to make a fpd...

all the fpd is is a space of air so the pulses dont shock the system..like plumbing in your house you have standing air tubes so you dont get that pipe knock
i have-8 an lines so everythign will be 4) -8 lines

youll need 1/4 npt tap
a earls fuel press gauge adater pn# ear-100197
basically its a npt to an adapter with a 1/8npt hole in it for a fuel press gauge
in that 1/8 npt hole youll need a pipe-to an adapter
pn#ear-981662 1/8npt to-6
then yull need a tube nut to cap the new fpd
pn# areoquip aer-fcm3675

tap the inlet side of the primary rail
then thread in the gauge adapter
put the pipe-an in the fuel press gauge hole cap that...
it will be like a big t with a small amt of air in the cap

ill post the stiff needed to hook it up to the stock lines in a bit..if not go to the rob rionetti site and go to his fuel filter section part

What Rob Robinette's site didn't cover was how to connect the SS lines to the stock fuel line or how to run the line back to the tank. The rest of it I have already planned out, just don't know that step.

it kinda does
you need 5/16" hose to 1/4" NPT adapter; one female 1/4" NPT to male -8 an

http://www.rx7turboturbo.com/robrobi...uel_filter.gif

see how he connects the fuel filter to the stock lines



if your runnin braided lines all the way bck just follow that procedure right @ the tank

:ret: duh, if i'd have only paid attention...

Your running -8 an lines from front to back? Is that really needed? I'm running -6 but I've thought about -8....is there a specific reason why you chose -8? Also I'm kinda lost on your FPD explanation......are you replacing it with your own version? Why would you need it? I've talked to alot of people who say it's garbage and useless.....i'm deleting it all together....but would like to know what other people think also that are doing there own system.

-8 lines are overkill IMO unless you are going for something beyond 400RWHP.. and well beyond I would think. -6 is plenty big.

Matt
93 SSM