Carl Fausett

exactly. cost was a factor in this kits design so we stayed with the simple and tried-and-true solutions. FMU's have been around for more than a decade and are proven performers in low-boost applications.

Mark944na86

So anything greater than about 10psi boost you'd recommend something more sophisticated (i.e., more expensive) than an FMU approach?

Carl Fausett

Of course! Starting with replacing your headgaskets.
They will fail at about 11 psi (the 928 ones do).

I also think the stock fuel pump will prove too small at about 11-12 psi of boost.

These are reasons why our kit is designed for 6 psi .

Fox944

I'm still wondering who copied this unique design. I've seen several different supercharger set-ups for the 968, and all of them are different in many ways.

jlasuncion

Hi Carl,

Thanks for the reply on the fuel pressure question. Just want to clarify that your kit is simply bolt-on and I dont have to 'tune' the FMU on the dyno with wideband o2?

Im a bit worried with quality of our fuel here, at most its the 91 octane in california, do you have the air-fuel graph done during your dyno testing? Is it ok to see the results?

Any experience or comments if the tiptronic tranny can handle the stage 1 and 2 applications? thanks!

edz968s

Is there any one who can point me in the right direction as to why I have 60 PSI at the fuel rail. I`ve exhausted all my ideas. I have a new FPR and have tried another, all to no avail.
I can`t run my SC kit until this is sorted. At the moment it`s just pouring fuel into the bores, fouling the plugs then dies.
Thanks in advance

Jfrahm

With or without the FMU? Can you run the return line to a jerrycan and see if your return is crimped somehow?

-Joel

Rogue_Ant

+1

edz968s

The install so far. Just need to sort the air-filter and get it working

edz968s

I disconnected the return line into a container, FMU out of the loop and still get 60 PSI on the fuel rail
With a tube attatched to the return end, I can blow down it and hear it rumbling in the tank, so no return line blockage

Rogue_Ant

Hmm, possible clog in the rail. Gauge is bad, or yet another bad (or 4bar) FPR.

edz968s

It`s a brand new FPR, new guage and I`ve had the rail off and checked for blockages and it`s all clear, checked the injectors, clear. I`m running out of ideas and patience now

Rogue_Ant

Have you triple-checked that the FPR is the correct unit? How about swapping with a known good FPR?

Carl Fausett

Does this suggest that you 968 guys have seen a bunch of defective-new FPR's?
Or 4-bar FPR's stamped as 3-bar?

Any advise you can give EdZ would be appreciated. He has removed all the fuel lines we sent him and put back the original fuel return line. He still gets 60 psi at the rail, and the engine runs as flooded.

edz968s

Both FPR`s I`ve tried are know good ones, BOSCH 0 280 160 287. Porsche # 944 110 198 06.
I`m going to try next is re-fitting the OEM injectors