Quote:
Originally Posted by voitureltd
Nope, As I understand it ( in lay mans terms ) the Andial uses the existing CIS injection to electronicly create a rich cold start situation to deliver more fuel. The turbo fuelers ( there are a few brands ) use a additional 7th injecter that you can use different size injectors to supplement your CIS fuel delivery capacity. Albiet not as accurately as in port fuel delivery.
|
Not correct, the way the CIS works with regards to cold start "through the main injectors" is via the bimetallic spring in the WUR, when there is no current going through the spring the WUR is set to create low control pressure (rich mixture), as the spring warms up it moves and raises the control pressure (leans out the mixture). The control pressure is then related to MAP, on cruise the control pressure is high, when on boost the control pressure lowers to richen the mixture.
I'm not entirely sure how the andial works but i was under the impression that it triggers the cold start injector which is essentially the same as having a 7th (single) injector. It is commonly accepted by all the major tuners out there that this type of fuel enrichment is bad news, you do not get controlled distribution between cylinders and run the risk of one or more of the cylinders running lean.
Porsche obviously deemed this safe to aid in a cold start situation, there is no risk there, but used to add more fuel whilst at WOT is not good practice.
Make me an offer for the fueler, it's never going back on my car anyway. BTW, this was fitted to my car by a "professional" tuner, it transpires the man is a clown so I'm not surprised the fueling is all over the place. Only fit one of these things if you don't give a **** about your engine, otherwise reduce the power of your engine until you can afford to get fuel in there properly.