Some final tuning(need the experts)Greg, Raffey, J

[JRCivic]

You must have a B&M Command Flo, Vortech fuel modifier or AEM FPR.
One of those new Holley FPR's would do the trick too.

[cpa]

I am about to do a similar fuel setup - prelude injectors, vortech sfmu (looks like I'll be the guinea pig on the board for this one) and B&M Commandflo (if the vortech isn't enough). My question concerns the rise rate suggested of 3.75 to 4:1 - I assume this is the total rise needed, so in my case that would be the rise rate on my vortech sfmu since I will have no rise rate on my FPR with the B&M.

With a FMU and the AEM FPR (a 1:1 rise rate), the rise rate on the FMU would only be 2.75 or 3:1, right?

[JRCivic]

CPA...
No, actually you would still need the 3.75 - 4.00 rise rate from the SFMU. The only advantage the AEM offers a FI customer is that it will rise under boost at 1:1... so if you happen to be lean at the transition from vaccuum to boost, it will help add more fuel there without causing a RICH problem at full boost.
The SFMU will actually take over well before the AEM is finished doing what it can to the fuel pressure... and then the SFMU will be operating completely on it's own.