Everyone knows Ecutek is better anyway. Such features as No Tuners anywhere, no map switching and little or no customer support. Woohoo.. :lol:

Also, I would agree that adding a bigger pump doesn't require a retune, but it enables you to go further with a future tune, with increased perameters.etc.

lol

I can get away with it, I described my current situation with ET. :lol:

Doesn't Mike @ Gruppe-S still tune ECUTek?

All true, except for that thing called a "fuel pressure regulator" that ensures there's a linear mapping of MAP to fuel pressure.

You only need a bigger fuel pump when your injectors are able to draw more fuel than the pump can provide, which in turn means a drop off of pressure at the rail below what the FPR is attempting to regulate to.

Pressure != flow. People replace fuel pumps because, at peak boost, fuel flow volume can drop off at high duty cycles and peak fuel pressure. Hence STi owners always being encouraged to replace their fuel pumps feeding their stock ~550cc/min injectors, whereas WRX owners do okay with stock pumps feeding their stock ~420 cc/min injectors.

Fuel flow is entirely determined by injector duty cycle and pressure at the rail. The amount of fuel flowing out of an injector is based on how long the injector is open, and how much pressure there is behind the injector.

I don't see how a larger pump on a stock car can change anything except how much fuel is cycled past the rails and back into the gas tank.

Apparently a stock STi that's tuned for more boost, and running its injectors at much higher rates to compensate, can run out of pressure in the rails. Since the stock mapping never runs the injectors at 100% DC, it's not a problem on a stock car. But if you're getting up there in DC, then you can run into the need for a bigger pump on an otherwise "stock" STi. i.e. the stock STi injectors are too big for the stock fuel pump if you tune it beyond stock power levels.

That's what I was saying. Stock WRX injectors can't outrun the stock fuel pump, but stock STi injectors can. If you had an infinitely capable fuel pump, you could make your injectors "bigger" by cranking up the fuel pressure, which increases the volume of fuel sprayed for each millisecond it is open. That's limited in how true it is in practice though, because you run into issues with the fuel lines, spray patterns, poor atomization, etc. Plus the part where there is no such thing as an infinite fuel pump...

Also, the other factor in how much flow an injector is capable of is the size of the nozzle. The only difference between WRX "blues" and STi "pinks" is the size and number of holes in the injector nozzle. The plastic and the solenoid are the same.

Where's that "the more you know" graphic Matt posted not to long ago? :)

:~: So...fuel pumps...

you obviously dont shampoo...
http://i3.photobucket.com/albums/y62...spaceghost.gif

Danish!

Dean I have had the AP on my cars Im well aware on how it works remember streettuner and thats why I went to a protune 2yrs ago Also I have had many discussions with mike warfield about this and sharing maps isa very bad idea because no two cars are that a like also who is to say that the tuner that built the maps did a good job thats why I said that sharing maps is not a good idea!!

Eric, I was not busting your chops, I know you have had an AP, and street tuner on two cars now, but you appeared to be confused how they could be using other tuner's maps... Sorry if I misunderstood your question...And I agree, using any agressively tuned map for someone else's car on yours is a bad idea.

Yes if you plan on gettting a protune!! Cody its not a power mod its so your #3 doesnt run too lean on boost after protune its a 89.99 safty net!!

woah... :lol:

That's pretty funny. :lol:

The new AP at rallysport!
http://www.rallysportdirect.com/shop...bo-p-2857.html