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Guys,

I've got a stock RS4 fuel pump at present and running nearly 500bhp. As I'm going to do some more tuning in the near future, which includes NOS I think I'll need much more fuel. Now I've read a few times that big tuners like mtm use 2 pumps. Now to get the full benefit these pumps needs to run in parallel, right ? I thought of getting a walbro and run it together with the stock pump. Like on this Supra
http://www.supravvti.com/specifications_fuelsystem.php

Anyone got some tips how to do this on an RS4 ?

Also, what would be the next injector step up from the RS4 stock injectors ? I'm sure the RS4 once are maxed out at around 500bhp, right ? I mean if you want to stick to a healthy 80 % duty cycle.

Cheers,
Dave

Dave if you show me a picture of your pump carrier I may be able to help ( that is my Supra site.)

You need to talk to rs4john or Andiroo, both post on a www.trackdayheroes.com regularly...... john had two pump system and Andiroo was heavily into big bhp too