will using a xr3i fuel pump on an rst work?
would it let it idle and not be enough fuel on boost or will it make it run like a bag of shit from the start
mates just converted a 3i to rst spec and he's havin trouble gettin it to idle,could the fuel pump be the cause?

 

Pumps are the same mate.

If its struggling to idle then i can almost guarantee theres an air leak.

Brake servo's are prime suspects believe it or not

 

I thought they were the same but been told their different flow rates, or put out different pressure?

 

Ive heard that aswell, but there was a thread a few weeks ago. The RS and XR have the same pump, and then people fit cossie pumps as uprated items which have a higher flow rate, but are identical to look at. I'll try and find the thread.

 

When I looked into this some were the same and some wern't. I was told to look at the part number on the side of the pump.

 

From the factory the pumps were the same, it will have a Bosch part number on it.

 

idlings sorted

nows its misfiring
sounds like a scooby,any ideas?
checked all the usual,plugs,leads etc

 

Again, i would say an air leak.

What did you do to cure the idle?

 

some tit had been tamperin with the idle screw
was fully closed over
we're just trying to get it to run before it goes to be set up

 

A vacuum gauge is an invaluable item on an MFI. Air leaks can make them sound as if they are mis-firing and they hunt and sound like a scooby. Is the mixture screw covered over?

 

mates away all weekend,ill go check it over the weekend while he's away.................if i can be arsed

 

Such a good friend

 

xr3i pump are different to an rs. xr3i only runs 2.5 bar static presurewhen an rst is 5 bar presure

 

Hmmm

I wasn't sure of this, but theres another thread where someone quoted me the Bosch numbers etc and said they were the same. I'll have to dig the thread out

 

[quote="SafeChav"]I am sure my autodata cd shows this too, ill scan in a copy and post it up.

 

what affect will this have on the running of the car?
could this cause a misfire?
cheers for the info

 

When u go to get set up u will not have the right fuel flow rate and the xri3 pump will give up

both have different parts numbers for the fuel pumps

 

Guys,

I had a chack on Auotdata, The XR3i pump delivery pressure as below



is just suplying enough pressure to run the turbo. Turbo below



In theory a 3i pump is ok for a limited time as if the pump was to drop below is maximum you could have reduced fuel then a lean condition then bye bye pistons!