capn

Moderators Note: This is an excellant discussion regarding the conequences of replacing the pulsation damper with a banjo bolt. Anyone thinking of doing this mod should read this thread completely and make their own decisions. This thread contains some mild arguing, so be patient and read it to th end. Lots of good info.


Hey all

i have pretty much everything required to do that bonjo bolt swap. but im a bit skeptical of the procedure. like why am i removing a "shock" where there should be one? i mean when i think about it its like if my car had no suspension it would shake itself to death and eventually fall all to pieces. so can someone give me some rational or PROOF that it actually works and why the PD isnt needed if its put on ALL the fuel injected rotarys.

i just want to be sure im not going to get another fuel leak and loose my 10th AE

Evil Aviator

The banjo bolt mod requires an aftermarket FPR with a built-in pulsation dampener if you want to keep the pulsation dampening properties. Otherwise, yes, I would be worried about killing the fuel injectors and/or improper fuel metering without a pulsation dampener.

capn

ok thats one thing i never really found in the banjo bolt mods. but what is a good fpr to buy i wanna do it soon so something locally available (pepboys or autozone)

RETed

If you're scared, don't do it.


-Ted

capn

im more scared of having my 10th ae catch on fire due to the pd

RotaryResurrection

iTrader: (8)

Ive done it for years with no issues. IF you're a whiner, or a purist type, make your way to the local dealership and place an order for a new $125 PD and be happy while waiting for *it* to fail in a few years' time.

NZConvertible

This is not a personal attack, since you're certainly not the only one who thinks this way, but this ignorance about PD's is incredibly frustrating. PD's fail because the are very old, usually over 15 years old. If you buy a new one (instead of being a cheap bastard and fitting a banjo bolt), you can pretty much guarantee that it too will last for at least 15 years (not "a few years"). If you're really that paranoid about the stock PD, go buy an aftermarket one.

RETed

I've seen PD's on FD's under 5 years old fail.


-Ted

Aaron Cake

iTrader: (1)

NZ pretty much covered what I was going to say. The PD is there for a reason, to absorb the "shockwaves" formed when the injectors snap open/closed. Nearly every EFI system on the planet is equipped with a PD, for good reason.

As for the part leaking, yes, like any part, they will eventually fail. But the vast majority of RX-7s out there are still driving on their original PD without issues. There will always be some initial failure, it can happen with any part.

Maybe I'm just weird, but I don't drive around in fear waiting for my PD to fail.

capn

is it really $125??? if it is im just going to buy an aftermarket one. like the marren one and be done with it thats rediculous.

Evil Aviator

The SX FPR is good.
http://www.rx7store.net/index.asp?Pa...S&Category=262
http://www.essexind.com/sx_frame.htm

ddub

Yes it is, I bought one.

capn

the marren PD is $114 and its rebuildable. i think i will spend more retrofitting that then buying an OEM one

SnowmanSteiner

The PD is a neccessary part of the fuel system. If you are worried about it failing and don't want to spend the 125 on a new one from mazda, get a marren. They are $115 and they don't have the problem of the nut working itself loose. Sounds like a win win situation to me, but then again I'm one of those freak guys who chooses to buy things that work rather than eliminating an essential part of the fuel system.

http://www.injector.com/fueldampers.php

- Steiner

ddub

I actually have a question that kind of goes along with all this. RETed's parallel fuel mod on his site has interested me, and I know it doesn't use a PD. Because of the FPR and the fact it's parallel does that mean it no longer needs it at all? Or is it another one of those "not that big of a deal" things like many people call the banjo bolt mod?

MakoRacing[FC]

That Marren FPD isn't supposed to fit on the side of the fuel rail is it? I think it would be cool to stick that thing in an easy to reach spot, away from hot stuff.

gingenhagen

archive has a marren FPD retrofit for N/As

capn

yeah i checked that out

but i have a turbo so i could do a write up with pics for turbo models

MakoRacing[FC]

Thanks, im reading it now.

1987RX7guy

iTrader: (3)

i had no problems, issues, or failures brought on by the banjo bolt replacing the PD, even without an aftermarket FPR. I ran the car for around 25k miles like that. Nothing failed or blew up. Injectors were fine and are on someone's car now working like a charm.

gingenhagen

Yeah, just needs more -6AN line and somewhere to stick that massive FPD.

capn

yeah on the front near the omp is where i think im going to put it

NZConvertible

Some aftermarket FPR's have a buit-in PD. That fact that the rails are in parallel doesn't mean a PD is no longer required.

ddub

That was my question basically. I realized there was no PD in the diagram specifically listed and just wanted to know why and what you were supposed to do. So you're pretty much saying that an aftermarket FPR with a built-in PD is the best option, correct?

NZConvertible

Yup.