HMW M1 supercharged E46 M3

[Greenday694]

Hello, I'm Keith, chief engineer of Hyde Motorworks.
I typically don't do installs on client cars. But after about 9 months from a very persistent client, I had some free time.
so I installed the M1 supercharger kit on his 2003 M3 convertible. This kit uses the Eaton m122h supercharger. To make room for the supercharger, I had to do the mechanical fan delete, using a spa electric fan. Replace the oil filter housing with one from a m50 , and a rally Road oil cooler cap, connected to a 10 row oil cooler. I also had to lock the ITBs wide open, and connect a mechanical cable from the ITB actuator to a 75 mm throttle body on the intake of the supercharger. And relocate the second TPS to the new throttle body.
that was the easy part. Tuning this setup turned out to be more problematic with the factory DME. Even with the HP CSL upgrade. Luckily I was introduced to TTFS, and he pretty quickly figured out how to make everything work. At 9 lb of boost, the car made 498 ft pounds of torque, and 514 horsepower at the rear wheels. This was below 6,000 RPMs. Unfortunately the belt started slipping, so we could not make any more power running it out to 8,000.

[Greenday694]

[9kracing]

Tuning this setup turned out to be more problematic with the factory DME.

This is the issue I've been running into.

Did you end up staying on the factory DME? What injectors are you using?

I bought an AEM standalone but I haven't installed it yet.

The ID1050x injectors I have just will not run on the factory ECU, I'm getting too much fuel. So right now I went back to the Dinan 440s, but they're maxed at around 410whp. Any snap throttle and the car bucks, I need to find a decent tuner myself.

[Greenday694]

Yes I definitely know what you mean. Trying to control really large injectors with the factory DME is problematic. I don't think the drivers in the DME can consistently control the injectors at a really short pulse with at idle and lower engine loads. Some tuners say it can be done. But rather than take their chance, I used 650 CC injectors from the fuel injector Clinic. They are large enough to support over 600 horsepower, but not so large as to be difficult to control at shorter pulse width operation.
in the future I would definitely recommend going standalone. There is a plug and play harness for the E46 M3 , that allows you to plug in the link G4 Fury X ECU. Then you can tune using a map sensor and a real VE table.

[headlock]

very cool, good to see something different.