Great Asp's Superformance - FE Build

[fkemmerer]

Originally Posted by Great Asp

Scott, Thanks for the kind words. You would have to ask Keith about what he thinks. I am still running out the car, and general operation of the car is great.

Rod,

I know enough to be dangerous.

I "originally" did not want to learn about the fuel injection, but as I get into the tuning of the car I can tell you that it isn't THAT hard.

I am doing homework right now to find out what ECU would do the best job of managing the system, and then switching over. I am sure the harness will need changes, but more where it connects to the ECU, since the inputs (O2, throttle sensor, etc...) are already in place.

If anyone has thoughts on the ECU's, this would be a good place to post them!

E

Check out the FAST XFI system. Its got good software, its relatively easy to tune, not overly expensive and has many useful options. I recently used the fast XFI on an ERA cobra with a TWM system on a 482 FE motor and got good results. Check out our website for more information on the car and the EFI setup on it:

http://www.anitafred.net/Cobra.htm

You can also see our build thread on this system for more information on the FAST XFI:

ERA 753 - Final Assembly in Progress

Let me know if you have any questions about the FAST system or EFI in general. We've build two cars with EFI (the other one is a 1963 Blown and Injected Corvette - see my gallery or the website for some pics) and I am hooked. Don't think I'd do another performance street machine without EFI.


- Fred

[Great Asp]

Fred,

Thanks!

The Cheif Tuner for Dynatek told me "the software must contain a very important offset for bringing in extra fuel against throttle position". I really think I will need to review all options when I get ready to change the ECU out. I am guessing that will be at the end of this years driving weather.

But first the gas tank.

The standard SPF unit needs help. The best I can tell it has no baffles, and no sump. I may fab a surge tank with a seperate pump and return to the main tank, or fab a bigger, new tank with a surge area. The standard unit is fine for a carb based system, but EFI needs pressure and a half full tank of gas in my car has the gas in the back of the gas tank when I take off under throttle, and the fuel pump cavitates, then the Dynatek system is "unhappy", which pisses off my motor

E

[fkemmerer]

Originally Posted by Great Asp

Fred,

Thanks!

The Cheif Tuner for Dynatek told me "the software must contain a very important offset for bringing in extra fuel against throttle position". I really think I will need to review all options when I get ready to change the ECU out. I am guessing that will be at the end of this years driving weather.

But first the gas tank.

The standard SPF unit needs help. The best I can tell it has no baffles, and no sump. I may fab a surge tank with a seperate pump and return to the main tank, or fab a bigger, new tank with a surge area. The standard unit is fine for a carb based system, but EFI needs pressure and a half full tank of gas in my car has the gas in the back of the gas tank when I take off under throttle, and the fuel pump cavitates, then the Dynatek system is "unhappy", which pisses off my motor

E

You are smart to get your fuel system into shape before upgrading the rest of the system. Baffles are a good idea. You do not absolutely need a sump as long as you have decent baffles and you keep you tank at least 3/8 full or more. I don't have a sump on my Cobra as it would show from the back of the car. I do have one on my corvette. The thing to watch is that you don't plumb the return into the tank too close to the pickup line as the agetation caused by the returning fuel will then to send air into the pickup line if they are too close. Its also a good idea to have whomever modifies the tank for a return install a tube that causes the return fuel to come out near the bottom of the tank where it will be covered by fuel. This will also help avoid agetation and air getting into the pickup line. You will probably need to install larger lines to and from the tank to a regulator in the engine bay to ensure that you can hold a constant fuel pressure at all engine loads.

- Fred

[Great Asp]

Originally Posted by fkemmerer

You are smart to get your fuel system into shape before upgrading the rest of the system. Baffles are a good idea. You do not absolutely need a sump as long as you have decent baffles and you keep you tank at least 3/8 full or more. I don't have a sump on my Cobra as it would show from the back of the car. I do have one on my corvette. The thing to watch is that you don't plumb the return into the tank too close to the pickup line as the agetation caused by the returning fuel will then to send air into the pickup line if they are too close. Its also a good idea to have whomever modifies the tank for a return install a tube that causes the return fuel to come out near the bottom of the tank where it will be covered by fuel. This will also help avoid agetation and air getting into the pickup line. You will probably need to install larger lines to and from the tank to a regulator in the engine bay to ensure that you can hold a constant fuel pressure at all engine loads.

- Fred

Great info Fred!

I really think I am going to build a bigger gas tank, and you are spot on with the return line. They installed mine right next to the pick-up

I will check the line size, but it is pretty big right now.

I need a gas tank ex-spert....

Thanks again Fred!

E