DDozier said:The Comptech FPR is a different type than the AEM unit, it will work, but it is another variable to tune around, the AEM FPR offers a more linear 1:1 progressive rate, while the Comptech unit depending on the spring installed, the size of the calibration washer and an air bleed setting will ramp at a higher rate. More info on how the Comptech FPR works is loacted here: http://www.comptechusa.com/store/media/instructions/FuelPreReg2005.pdf
When adding the AEM the AEM FPR is not required, the stock OEM FPR can be reinstalled into the car and used, I think the stock unit is a 1:1 as well, some issues have been raised as to the OEM FPR being overwelmed by an aftermarket HP fuel pump such as the Walbro 255, some have been using the OEM unit but most put in the AEM FPR or comparable unit. The AEM offers easy adjustability and a choice of return orifices to match the pump volume.
If the fuel pump can supply the fuel the use of the Comptech FPR with the AEM may allow you to get away with a smaller injector, but most would agree that an injector is better to be a little oversized than undersized, and if you are replacing the injectors anyway just get the correct size for the HP you intend to make.
Most are running RC 550cc injectors for highboost CTSC setups
Dave
Dave,
Thanks for the information, it has saved me a lot of research time. The AEM FPR seems like a good addition given its relative cost when compared to that of the overall system.
Bob