Getting my walbro and FPR fitted soon and was thinking of getting the parallel fuel rail mod done. Have seen a couple of threads detailing how to do it but as I know nothing about engines I don't fancy getting busy under the bonnet and screwing everything.

Does anyone know how much it should cost to get this done and do I need to buy a kit or something?

 

There are full kits available, try www.mrtrally.com.au (I think).
If you do not know engines and are not a 'good' mechanical type, please be careful!
The fuel system on injected cars run at very high pressures, failure in installation can lead to volumous leaks of fuel and WILL result in a serious under bonnet FIRE.

You could do worse than talking to Alyn at www.asperformance.com (or co.uk).

Graham (I've done the mod)

 

Thanks Graham,

Have sent him an e-mail so hopefully I'll get some good info. Like you said, I don't particularly want to be messing around with it myself so I'll leave it to the pros!

 

I don't want to put you off but unless you are going for a lot of power it is probably unnecessary and a lot of effort and expense for no gain.

 

Perhaps hes looking for the added safety-margin? Its always number three.....

 

Can anyone provide any better information on this subject as neither of the websites above tell you anything.

Cheers

 

Just covering another base IIRC Usually combination of a poor pump, High fuel usage and end of line pressure drop.

I have seen them advertised on TSL website aswell

Tony

 

If you peirce in "Series" 4 holes in a hose pipe each hole will have a lower pressure than the first. With the furthest hole from the "Pump" will have the lowest Pressure, "Pressure drop".
If you branch off from "Pump" to each hole in "Parrellel" the drop will be equally shared between the 4 holes.

The mixture injected is relative Fuel pressure and IDC. if the pressure drops the mixture is leaner IIRC

Hope this helps

Tony

 

Just going for the safety aspect really. Haven't had reply yet from Alwyn but will let you know what the cost of the mod would be if you were to have it done professionally. Just saw another recent thread stating that FPRs are bad for the car. Is this so?

 

http://www.tsl-motorsport.co.uk/news...007&detail=186

 

Thanks for the clarification and the link.

 

http://www.airpowersystems.com.au/wr...ems/frp_01.htm

for the bling look.

 

I think Harvey makes a valid point.
I did mine because of aiming for 400 bhp from an Sti v3, so needed to ensure all was well.
Fro a stock engine I doubt there is any gain to be had.
Graham

 

I had big end bearing failure on number 3 and i run about 270bhp on a legacy, i'm seriously looking into this mod purely to rule out the fact that it might have caused it....

 

Why would parallell fuel rails stop number 3 big end going ?

 

So that detonation would occur at the same time.... with equal amounts of fuel I'd imagine? - don't quote me though.....

 

If the failure referred to was caused by det it was most likely to have been caused by a lean condition and/or too much advance in the one cylinder.

With all else being equal (chamber volume, cylinder bore, injector flow rates, runner lengths etc) they'll be less pressure drop across the cylinders so the measured (ie actual) air fuel ratio of each cylinder will be the same and equal spark timing can be run across all four cylinders.
In most cases, without individual cylinder trims, ignition timing becomes a compromise to suit the worst case cylinder rather than the optimal amount we should all be running for maximum power.

 

This is very interesting. Do you consider there is a problem on the O/E set up or at what point does it become a problem?

 

Very much what I was trying to say, but I can understand your explanation Is the pressure pump variable or muliti-speed? and most problems stem from long high speed runs and the Fuel pump unable to cope.

Peeps have reported, just before the failure that the car seemed to get another 50+hp !! Is this the start of it generally leaning out and then the end of line "pressure drop" results in No3 Failure. Or could it just be Oil burning up form an already doomed No3 piston?

Tony