Difference between fuel controllers for EFI

[Hunterworks]

Been reading a lot of threads on here about fuel controllers and it appears some people might be confused about what they do so I am going to try and explain them.

FYI Hunterworks is a dealer for Dynatek, DynoJet PC and MSD but we are partial to the MSD.

Basic fuel controller: These normally have three screws or buttons on the face to adjust fuel. Dynatek makes one and Dobeck makes one. You will see a multitude of names on the Dobeck units and the reason why is this. If I wanted to make a engine mod or exhaust and needed a matching fuel controller Dobeck would private label me a controller and it would be set for my engine mod I was selling. If you venture away from the mod I was selling you would need at minimum a air/fuel ratio gauge to get it back in line. These controllers adjust fuel in ranges meaning 0-3000, 3000-6000, 6000-9000 RPM so if you need finer detail and most often you will your out of luck Also this type unit does nothing for spark, timing, rev limiters etc only fuel. Look at this product as electronic jetting and that's it. The Dobeck units will not take fuel away while the Dynatek does.

Power Commander:

This is nothing more than mentioned above but with lots more resolution meaning there is a table in the software that looks like a excel document with RPM down one side and TPS (Throttle Position) down the other. If you want to tune this yourself you will need not only the software and computer but also a air/fuel ratio and really a load control dyno so you can hold the engine in each cell on the table to set it. As far as quality of the fuel map this is very good. Very hard for end user to adjust. Some dealers preset these for you for their specific mods but if you waiver from their mods your own you own. You can add the ignition module to the PC if it is available for you ATV then you can control timing and rev limiters but Dynojet normally will only allow 500 more RPM

They also have available for the PC V a auto-tune function which will map the fuel for you, downside is you need a base map that is within 20% of being right and there is not ignition module available. This auto-tune module is about $350

The price of the PC is about $350 and ignition module about another $350 so it really makes it too expensive of a option.


Dynatek Ignition Module:

This unit as it comes from Dyna is just a ignition module with the power to be a programmable ignition and fuel controller but to access these functions you will be required to purchase the serial programmer. Kind of like selling you a ATV and then charging you another couple thousand for the keys. The ignition module has four programmable timing curves in it and the ability to control fuel just like the Dyna fuel controller only but as I mentioned you need the programmer to access them. By installing just the dyna on a BF not sure if you will gain much if anything so to be able to do anything with it and actually receive a benefit you will need the programmer. Module is $225 and programmer another $225 To my knowledge no one sells this unit preset to any mods so you would need a air/fuel ratio gauge to set it plus the knowledge of EFI.

The VDI:

This one I hate to discuss cause I like the owners of Velocity Device so much. This unit and the BF 750 has issues that don't seem to get resolved. This unit is the only one that replaces the stock ECU so it now controls all functions of the vehicle. I will leave this one here saying it best to let the stock ECU do what it does and just remove the ignition and fuel functions with a piggy back box so you don't have issues.

The MSD:

This one is very new to the BF 750 and my favorite. The MSD is everything wrapped up in one box and might be explained best by reading the tech article on the MSD I wrote which is in this same section of the forum.

In a nutshell the MSD is a fully programmable ignition and fuel controller with really no limits to it. The software has a multitude of engine functions you can monitor in real time, you can set rev limiters, speed limiters, map out timing and fuel anyway you want it. To put it bluntly the MSD makes all other units obsolete, it does it all with no limits.

The downside is like most other units you will need a understanding of EFI, the software and at minimum a air/fuel ratio gauge and laptop to make the settings.

The price is $425 which makes it the least expensive option compared to any unit above when you put both ignition and fuel controller prices together.

We preset the MSD optimized for stock exhaust and Muzzy exhaust we also have a fuel map for a Fundy Std bore kit with trail cams. We have more maps to come.

MSD has been in this market for a while with units first in the Rhino and Teryx with little to no issues. Hunterworks provides some R&D for MSD by testing pre-production models making suggestions on the software for each and by being a beta tester for any issues before release.

General Info:

Remember if you don't have the mods the sellers has it mapped for then your on your own to determine you fuel requirements and this applies to any of these. Also realize most of these units do not come preset and your own your own to determine your requirements.

The reason I am posting this info is cause I hate to see someone spend good money for a product that does not do what they thought just because they were uninformed.

Todd