jss

I know I can ditch stock fuel pressure reg but can I delete fuel dampner?

choinga

Why would you want to do that?

Fuel pressure is maintained at a constant value by the FPR, but the pulsing of the injectors causes minor fluctuations in rail pressure. The damper acts as an accumulator to smooth out these pulses ensuring accurate fuel metering.

jss

so everyone that has a aftermarket fuel regulator keeps the dampner?
no many cars have one really dont see it doing much or being needed.

rlm328

Yes, we keep a dampner. The dampner does just what it's name implies, it helps smooth out the pressure fluctuations in the fuel rail when the injectors fire.

jss

thanks for the info

Chris White

The stock management system uses a batch fired set up - all the injectors open and close at the same time. This can cause a fluctuation in fuel pressure as the system goes from all closed to all open. The damper absorbs the sudden changes.

Stand alone systems running in full sequential do not need a damper and they are not required for a semi sequential but it is a good idea to include one to keep the fuel pressure as even as possible.

Mike Lindsey

968 does not use a damper. S2 does. Go figure! They are different injectors.

toddk911

Except for those going full rebuild or fuel system replacement, I don't know of many ever getting a new damper.

Is it something that should be replaced if old/stock?

Mike Lindsey

If it's pissing fuel out the vacuum nipple, yes. If not, no.

running_cold924

speaking of pulsations, i can really her my fuel pump when the car is at idle with 83lb injectors...tump tump tump tump tump tump tump.............

this is a new dampner as well...it killed my fuel pressure gauge too!

Scott H

Is this running the Bosch or Walboro?

running_cold924

Walbro GSL 392

jss

vw uses the same way of firing and does not use a dampner?

choinga

me too - I've killed 2 fuel pressure gauges since I put the 83#'rs in!!

m73m95

Why would the flow rate of the injectors have anything to do with that? All the damper does is smooth the pulses of the injectors firing (as already stated in this thread)

The FPR is what controls the pressure in the system, but shouldn't have to exceed 3bar (44lbs) in the system...especially with 83# injectors (WHICH ARE F'ING HUGE!), so there should be no additional strain on the fuel pump.... can't imagine why it would sound different.... or why you would be going through gauges....

The needs of the engine are the same regardless if injector size anyway. Say you want 14.7:1 AFRs... if your engine is at idle, it will require the same amount of fuel that a car with 23# injectors would need at idle to achieve 14.7:1 AFR.

I am running 80# injectors in my NA right now ..... which are massively over kill (They are for my turbo build. Stock injectors were going south, so I upgraded to what I will need in the future) ... and my fuel pump sounds the same.

#80+ injectors are WAY overkill for a 951 anyway. I'm planning on 400+ RWHP on E-85 with a 2.8.... and I still will have tons of head room. Why are you guys running such big injectors?

Unless I have completely missed something, I don't understand why you're having the trouble you're having.