[eschaider]

It was just off the cuff trying to be responsive to the issues the OP tabled as being important to him plus a couple he did not table that I thought might be helpful for him.

Your MSPro-Ultimate experience is much like others I have persuaded to use or found already using the MSPro system. The user interface on the system that the guys at EFI Analytics / TunerStudio have built for the system is easily the best on the market today. The expansion capabilities for toys like EGT, Digital dashes etc compare very favorably with systems costing 3X the price of the MSPro-Ultimate.

Not to be an advertisement, although that is the way this feels, some other things I liked about the system were the ability to use virtually any sensors you wanted because the system allows you to calibrate for your sensor of choice. Another item, near and dear to me for my implementation, was the ability to support a returnless fuel system model. The B&G guys built the returnless logic right into the system for us.

The big benefit of the returnless fuel system model is that the pumps are manipulated using a pulse width modulated signal, in real time, to supply only the amount of fuel needed by the engine. This turns out to be a big deal if you have a high horsepower implementation and is how Ford implemented their EFI for the supercharged but street driven vehicles they offer.

You need to build the fuel system to be capable of sustaining the engine's max power level with sufficient head room for the good air days. That means you end up driving around with say a 550 HP (or larger) fuel system returning all but 25 HP worth of fuel to the tank around town or even on the highway.

The issue becomes the fuel being heated to engine compartment temps before the surplus fuel is returned to the tank by the fuel pressure regulator. The octane enhancers the refinery and the distributor add to the fuel base stock for our high octane needs, boil off at around 87˚F.

As the unused fuel is being returned to the tank, these important (for us) octane enhancers disassociate with the fuel base stock in the return line on the way back to the tank. Like a stale beer or soda, you just can't get the fizz or the octane enhancers reassociated with the beer or the gasoline base stock. Suddenly you have a tank of 87 octane gasoline.

One of the sure signs of this disassociation is the whooshing sound you get when you remove the cap from the tank to fill up at the gas station. The whoosh you hear is the disassociated octane enhancers in vapor form literally going out the filler neck into the atmosphere.

The returnless fuel system model protects against this unhappy ending but requires a bit more effort tuning the MSPro-Ultimate's fuel system delivery PID driver to control pump overshoot. You also need to use turbine pumps with the system if you intend to manage the fuel system this way. The turbine pumps allow the speed variations the pulse width modified (PWM) fuel pump driver will command of the pumps — which MSPro thoughtfully supports. The pumps are easily obtainable and competitively priced with non turbine designs.

Once you start comparison shopping for EFI systems the feature set that the MSPro-Ultimate system provides is very comparable to Haltech, Motec and other high end systems costing thousands more. An extra added attraction is the MSPro user interface on the tuning software. It is much easier to understand, learn and use.

MSPro is among the oldest aftermarket suppliers of universal EFI systems, the current MSPro-Ultimate generation is factory assembled with a lifetime warranty, field upgradeable firmware and if you want to you can even wirelessly program your engine from your notebook. The tuning software is available for either Mac or PC.

If anyone reading this post has not guessed by now, I am modestly impressed with the MSPro-Ultimate offering...


Ed