I installed the E.A.T. Ultrachip in my 93 525ia (M50 w/ VANOS, DME 413) and want to share my evaluation.
First I want reveal what my expectations were: I only expected to “feel” any
power increases in the high end of the rpm range. Even then I thought any
increase would be peaky or short lived. Aside from this, I anticipated a smoother
running engine and perhaps a small improvement in gas mileage.
Now, I can enthusiastically say, WOW, was I wrong!
Right off the bat I noticed the car moved much easier with very little throttle.
Throttle response is much improved as well. ED mode: The car feels like it has
more power everywhere, not just in the upper end. The 525ia is a notorious slug from idle to 2,000 rpms.
The increased torque from E.A.T. Ultrachip greatly improved this.
Select the “sport” mode and the car is transformed. It accelerates much quicker and
smoother from 3,400 to 6,300 rpms. Fuel mileage has improved by more than
1 MPG to date. I truly expect this to increase even further do the fact that I have
been “experimenting” with the performance gains of the E.A.T. Ultrachip all too frequently.
Obviously, I recommend the E.A.T. Ultrachip. Installation was quick and easy.
It took me less than 30 minutes and I performed the chip swap at work,
in the parking lot. This is an upgrade that definitely registers on the seat-of-your-pants
dyno. If I had to broadly summarize in one sentence how my car feels with the Ultrachip,
I would say, “my car feels about 750 pounds lighter”.