Performance Coils

[FSETH]

Originally Posted by JCL

So, if we believe their dynos, and you want to get 3% more hp in the upper rev ranges, why not just drive at 3% higher rpm? That is free. To me, none of those very minor hp gains mean anything on the street unless you are at WOT, preferably at redline. My X5 never spent much time in that situation.

I guess the software would be more desireable to those who use WOT more often. I would say I go WOT at least once every time I drive my car. Multiple times in some instances. Personally, I don't think I would pay for any software upgrade if I had a 3.0 X5, but that is just me. A 1-2% gain isn't really worth it, imo.

I have a Conforti chip in my e36. According to Turner, my gains are 22 hp and 20 lb. ft., which seemed worth the $300 to me (even if those figures are slightly high). The increased RPM's seemed like an advantage as well.

[Weasel]

What I would be looking for in "performance software" for my X would be activating the vanos earlier under a bit less load, slightly tweaking the spark timing advance, slightly tweaking the fuel map (and I mean not by too much on that one) and removing the top speed limiter (like I ever need to go over 155mph anyway)

Not all tuners cover all those areas, and most mainly change fuel trim and higher rev limiter... I would rather the timing and vanos changed for some low end results I feel in daily driving.

[wallyx5]

Originally Posted by FSETH

It seems like there was more HP left on the table in the 1980's and early 1990's. Mid 1990's and on the gains started shrinking (with the exception of the new turbos). I think Conforti squeezes about 20 HP out of the new M3 with dyno sheets to prove it.

The dyno sheet on Turner Motorsports website shows a 2 lb. ft of torque and 3.5 HP increase for the X5 3.0 engine. Add the Conforti cold air intake and it bumps it to 7 lb. ft and 7 HP. Also, keep in mind that most of this HP is available in the second half of the RPM range.

I saw that too and figured with the headers and cats removed I may get some additional gains. I am going to contact Conforti and see if they can tweek a chip for me similiar to what they did for the M5. They have a chip for the M5 with headers and cats removed. It's probably just wishful thinking but I am going to ask.