RS4 Fuel Pump Swap

The project of the day for the Avant was to remove the existing stock fuel pump and install an RS4 fuel pump.  The stock fuel pump has been a hold-over from when I acquired the Avant, the previous owner was driving the car with K03’s and a tune so it was doing fine with the stock pump.

Audi B5 S4 fuel pump well
RS4 and S4 Fuel Pump Swap

I’ve got the car equipped with 60# EV14 fuel injectors and a pair of Turbo Concepts Stage 1 turbo’s operating around 21 psi, so I figured having the larger fuel pump supplying the system would be a good idea.

Audi B5 S4 Stock Fuel Pump

The last time I swapped fuel pumps I told myself that if I was to do it again I would get a hold of the Schwaben fuel pump to make the removal and installation easier.  Here I am swapping fuel pumps again, I think this is now the fourth time I’ve pulled a fuel pump out.

Schwaben Fuel Pump Tool
Schwaben Fuel Pump Tool

While the fuel pump can certainly be removed without a specialized tool, I find that it makes the job easier and was worth the cost.

SRM IC Temperatures

I’ve not had much opportunity to assess how the Silly Rabbit Motorsport side mount intercoolers compare with some other IC’s that I have used, under conditions beyond a FATS pull.

Recently temperatures have been in the mid 90’s so I made some recordings of Intake Air Temperature to gauge how these intercoolers fare.

silly rabbit motorsport side mount intercooler

The first chart is of the IAT’s and boost pressure during a session of assessing how boost onset looked at various engine speeds for the Turbo Concepts Stage 1 turbochargers that my S4 is presently operating with.

Boost is repeatedly requested with a short period of recovery taking place while the engine speed settles back to the next starting value.

Not surprisingly during the period of repeat boost events the intake air temperatures are increasing.  During four mintues of steady state driving at 50 mph the IAT’s return back to a value approximately 20 degF over ambient.

The next log was recorded during an afternoon commute.

Once again when steady state driving takes place the IAT’s settle to approximately 20 degF over the ambient temperature.