In Reply to: Performance chips posted by Rick Ohlund on April 01, 1999 at 00:02:18:
: New owner of a 93 525ia, should have found a 535, oh well. Which aftermarket performance chip(s)is(are) most reliable for the 525??? Are the performance claims believable? Is tweaking an automatic even worth it?
There are 2 articles in The BMW
Enthusiasts Companion about performance chips. Bear in mind that they are from the early 90's,
but the reasoning behind my getting an Autothority instead of a
Dinan chip was the concept of remapping fuel delivery along with timing throughout the rev range,
not just at full throttle. I still have never seen or read an article anywhere that has compared all the current chips on a dyno in the same car under controlled conditions and then taken them on the road back to back . Given the number of people who ask about these things and
buy them, that puzzles me. A lot of people are looking for a lot of
power, and you will get an increase, but I'm convinced it is the improved throttle response
that really makes these things worth the money on a daily basis,
and response and feel are hard things to graph and quantify.
Remember, money and work will certainly give a 525 the power of a 535 but it will not feel or drive
anything like it. I haven't read about anyone else on this board using Autothority, but I love what it did for my 535i, and doubt you will go very wrong with the top name brands. And, if someone has seen a good comparison of these things and I've missed it, please let me know