I came across an interesting comparison product or a route that you might want to take or consider since it was a major challenge and issue tuning it.Here some info on the HPF E46 M3 EMS that is a fully pnp stand alone that works in conjusnction with the original ECU.ENginer from AEM helped them crack the stock Siemens ECU and mapped it for them anyway here is some info.Now a system like this on
the Speed3 would be wonderfull with 93 Octane fuel.'
Take one look at the engine management pictures and you'll see that this is no ordinary Horsepower System. Designing and creating an engine management system to run the S54 engine was not a simple task and required a joint development effort between HorsepowerFreaks and AEM. In fact two AEM engineers relocated from California and now work for HorsepowerFreaks in Portland, Oregon. They are both primarily responsible for designing most of the components for these amazing Horsepower kits. The electronics included with every kit are completely plug-n-play and even come affixed to mounting brackets to safely secure them to your M3. To ensure each install goes without incident, every wire is labeled, every connector uses heat shrink wrap, every wire is wire-loomed, in several places shielded wire is used, ring terminals are already attached and labeled, and fuses are affixed to the bracket and pre-wired. The fuel pump and
oil pump relays are also attached to the bracket and pre-wired, the high end AEM 3.5 bar map sensors for the boost gauge and EMS are affixed to the bracket and pre-wired and the exact BMW connectors for plug-n-play operation are attached, loomed and pre-wired. Even the race fuel switch is pre-wired with a connector, the intake air temp sensor is pre-wired and labeled and simply screws into their intake manifold which is also labeled, the boost control solenoid is also pre-wired and labeled, and the fuel pump trigger is pre-wired that turns the extra fuel pump on at 3psi. Wow, with nearly everything all pre-wired, this installation is sure to be a breeze
We developed our own plug-n-play M3 engine management system that works in conjunction with the stock DME in a seamless environment. Unlike some other E46 M3 boosted applications where the throttle cable is removed or dash functionality has been compromised, our system allows every original component to still work and function as designed. Our kit completely eliminates the need for the power robbing MAF sensor and allows significantly more air flow into the engine. Our electronics also provide precise advance/retard control of both cams (dual vanos) based on both rpm and boost allowing greater power gains during forced induction. Precise timing and fuel control is calibrated based on any number of factors including the environment, altitude, gear selection, boost, road conditions, etc. Our engine management also provides optimal control of our 750cc high impedance injectors and is able to utilize the stock coil packs and spark plugs without requiring an auxilary ignition system.
Our kit is completely plug n play from the electronics to the entire turbo kit itself. Every kit comes with all of the electronics pre-assembled. The main black bracket simply bolts in with 4 supplied bolts to pre-existing holes in the engine bay on the passenger side near the front windshield. The rest of the connectors and components simply plug right in. Every wire is labelled, every connector has heat shrink wrap, every wire is wire-loomed, in several places shielded wire is used, ring terminals are already attached and labeled, fuses are affixed to the bracket and pre-wired, the fuel pump and oil pump relays are attached to the bracket and pre-wired, the high end AEM 3.5 bar map sensors for the boost gauge and EMS are affixed to the bracket and pre-wired, the exact BMW connector is attached, loomed and pre-wired, the race fuel switch is pre-wired with a connector, the intake air temp sensor is pre-wired and labeled and simply screws into our intake manifold which is also labeled, the boost control solenoid is also pre-wired and labeled, and the fuel pump trigger is pre-wired that turns the extra fuel pump on at 3psi. The EMS comes programmed for the car, and is already calibrated for every sensor used and the rest of the turbo system