Hi,

I'm considering putting together an incomplete SC kit on my S2000 and just have a couple of questions in mind that I could use clarification on.

First, with the stock fuel system, the FPR will raise/lower fuel pressure at a 1:1 ratio based on an increase/decrease in vacuum. At atmospheric (remove the vacuum line) this value will be about 45psi??

So, hypothetically, if I were to install a supercharger and run 10psi of boost, the fuel pressure would rise to 55psi.

Now if I were to install an FMU (Vortech 10:1 for example) after the FPR, would I see any increase in FP at 5psi of boost over the stock fpr? I understand that the stock fpr would maintain 50psi (45 + 5) in the line and the FMU would hold 50psi (5 X 10psi), so overall, you would get 50psi of fuel pressure. However, if you were to run up to 10psi, the FMU would increase the line pressure to 100 psi. Is that basically how it works? It's not like the FMU raises fuel pressure by 10psi for every lb of boost (from 0-10psi), but there is a point (5psi in this example) where the FMU starts to control the fuel pressure.

Also, the S2000 (AP1 at least) uses a return type fuel system, correct? Are you able to use a digital FMU (Such as an Aeromotive) which is designed for a returnless fuel system?

What rise rate is typically used in the Vortech and CTSC kits for the S2K?

Sorry about the basic questions.... just trying to get a better understanding.

Thanks

 

I have used FMU's and they are not worth it, you would be much better off getting a set of injectors and Piggyback, however a full EMS will be a much better choise. I know this is not the answer you want but I promise you will regret ever getting one if you do.

Yes, your logic is correct on the opperation of an FMU.

Oh, and what ever you do don't forget to get a Walbro 255LPH pump.

 

Hey, thanks for the info.

Another question: I'm looking at a set of RC 750 injectors and was wondering if these are the right ones for an AP1. Here are the specs that I got:

Part Number:
SH4-750

Flow Rate - CC's:
750 CC's / MIN @ 43.5 PSI

Flow Rate - LB's:
71 LBS / HR @ 43.5 PSI

Resistance:
12.5 Ohms @ 68 F

Voltage:
8-15 Volts, nominal 13.5 Volts

Amperage:
1.0 Amps

Pressure:
Min 30 PSIG / Max 70 PSIG