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      04-28-2014, 04:30 PM   #9
Boss330
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Quote:
Originally Posted by Tom C
Quote:
Originally Posted by Boss330 View Post
The AC Schnitzer doesn't connect only to the MAP sensor as far as I know. It connects to the main wiring harness/plug to the ECU's and intercepts at least MAP and fuelling.

See page 5 (scroll down to the English text) in their installation manual:

http://preisliste.ac-schnitzer.de/ac.../121410710.pdf" rel="" target="_blank">http://<a href="http://preisliste.ac...410710.pdf</a>

Here it says that they mainly alter the fuelling and adds a little boost in addition...

Dyno results:

[IMG]http://preisliste.ac-schnitzer.de/ac...stung11548.jpg[/IMG]

http://preisliste.ac-schnitzer.de/ac...10&ID_NR=11548" rel="" target="_blank">http://<a href="http://preisliste.ac...D_NR=11548</a>




After reading the Vividracing install manual, I agree that the VR Box is nothing more than a boost piggyback that adjusts for rpm (and possibly load as a function of rpm and boost).

And as proven by the 11,07s time set at the 1/4 mile by a BMS equipped M5, that product also have a proven record as regards performance (not sure how much of that time was down to slicks or the tune - Trap speed (a good indicator of engine power) at 128MPH isn't that much higher than a stock M5 though?).

BTW. Most of the other ACS tunes are now CANbus and alter fuelling, ignition and boost. Their diesel piggybacks have wiring connectors to each injector, directly controlling injector opening times.
You have to realize that the trap speed at the track is going to be LOWER than a GPS based trap speed that a magazine uses. The 128.68mph trap speed at the track is probably a 130+mph GPS trap speed given that the 128.68mph trap is derrived by averaging the last 66' of the 1/4 mile run using timing lights. So comparing apples to apples, the best stock F10 M5 trap speed at the track was the 124.05mph trap by Patb23 with his '14 CP. Out on the track, 4.6mph is a pretty big difference in power and the CP package seems to be making a good deal more power than advertised 15hp. I am sure a modified CP would be faster than a non-CP with the same exhaust mods and piggyback system.
Thanks. I was obviously thinking about a real drag strip 1/4 mile trap speed.

Didn't recall what exact times the M5 had done, hence the ? in my post
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