FAST™ Top 10 FAQs

[jjamros]

This FAQ contains the most frequently asked questions received by FAST™ technicians. If you have a specific question that you cannot find an answer to, please call FAST™ directly at 877-334-8355, or visit the Tech Help section of the FAST™ web site.


1. Is there a special type of intake manifold I have to use with the EZ-EFI® system?

No. Any manifold you have used with a 4 barrel carburetor will work with this system. It has been tested with dual and single plane intakes. As with carburetors, using adaptor plates to adapt a 4 barrel to 2 barrel is not recommended due to poor air and fuel distribution.


2. Will the EZ-EFI® work with E-85 fuel?

At present, the EZ-EFI® is configured to work with gasoline only. An upgrade to work with alternative fuels may be available in the future.


3. Can I use a turbo or supercharger with the EZ-EFI®?

No. The MAP sensor and tables in the firmware are only rated and scaled to 1 bar for normally aspirated applications.


4. What difference does the Big Mouth 102mm Throttle Body™ make on the performance of the manifold?

Performance testing has shown up to 5 horsepower over 92mm throttle bodies, and throttle response is much higher with the 102mm.




5. I noticed the vacuum port on your manifold is in a different location. Please explain.

The FAST™ LSXR™ series of manifolds is designed to fit model years 1997-current. This requires using one common location for some fittings. Certain applications may require routing hoses or wires accordingly to mate to the FAST™ Intake Manifolds.


6. What is included for installation into GM Gen IV LS3, L99 and LS7 engines? What else is needed?

All hardware and fittings are included. The only intake that comes with intake port seals is the LS7 (part # 146203) because only the FAST™ seals work. All other manifolds do not include intake port seals, but we do offer and sell them separately. In some cases, fuel rails are required – refer to the application chart below.

7. Can you explain the features of the XIM™ and what it actually does for the XFI™ system?

The XIM™ allows the XFI™ to be used as an engine control on any modern engine, including GM Gen III and IV engines, Chrysler 5.7 and 6.1 Hemi engines, and Ford Modular engines (2, 3 and 4V valve train). The main feature of the XIM™ is that it allows the use of the factory sensors and factory coils; FAST™ has a direct plug-in harnesses for these applications. In addition, the XIM™ can be used to retrofit newer coil-on-plug ignition systems to older engines.


8. Can I use the XIM™ to run my ignition coils on carbureted 5.7 & 6.1 Hemi; LS1, LS2, LS6, LS7; 2, 3, & 4 valve Ford Modular engines?

Yes. Our XIM™ system is designed so that you may run a carbureted setup and still maintain coil-on-plug ignition. You will need to contact the FAST™ EFI HELP™ line (1-877-334-8355) for more details.


9. How does the XFI™ work with nitrous?

The XFI™ will give the tuner total control of up to four stages of nitrous. You can supply fuel enrichment for the nitrous system as a "wet" system (fuel through the nitrous plate or nozzles), or as a "dry" system (fuel through the injectors). In the case of a "dry" system, a separate fuel table is activated with the nitrous solenoids. The timing is also automatically retarded to the settings you select for each stage. There are activation parameters that must be met for the nitrous to activate, and the subsequent stages are activated on a time based delay.


10. Do I still need to run a mass air meter with the XFI™ system?

No. The XFI™ is a speed density system, so it doesn't use a mass air meter. Speed density systems use the manifold pressure and air inlet temperature to calculate the volume of air entering the engine. Speed density allows you to do away with the mass air meter, and it also factors boost into the fuel and timing calculations.