Yeah, you did waste your money, unless you buy two more HI-6 units and 2 more retard controls.

I would install the Hi-6 on the leadings and return the retard.

The Hi-6 is a great mod for use with nitrous.

Stock timing on the stock ECU for a 75 shot is still plenty retarded from optimum; you will have no problems with it.

 

thanks for all the info guys i will defentily post some dyno sheets when im all done with this

 

My stock regulator ran 45psi with no vacuum reference.
Either my 2 stock regulators(one S4 and one S5) were broken or the walbro pump increases stock pressures but I've always run around that range.

 

Does the stock fpr increase psi when boost is present??

 

Yes. 1 psi of fuel pressure for every 1 psi of boost. All FPR's do this.

 

Yep, at idle it sure does on S4 cars. The fuel pressure would drop at WOT under load, in the higher rpms, as the engine consumes more fuel.

 

Why not? He's not the first n/a to run with an aftermarket fuel system/fpr, all depends on what your goals are for the car.