: I know this is going to create some controversy, but numbers are numbers. A few things to keep in mind when looking at the spreadsheet: All of the numbers graphed are at the rear wheels of a CSi. While I have added a pair of “drive line adjusted” columns to the right of each table, these numbers are not graphed. All of the calculations on summary sheets and graphs measure from 1800 – 6000 RPM. This guarantees an apples-to-apples comparison of time intervals. If someone double-checks me & finds an error I made, please let me know, as I would like to have the most accurate data available and my last intent is to misrepresent anyone here.

: The Dyno runs were done in sets of four. All runs were done in 4th gear. We threw away the first run, and then took the middle of the remaining three for each set of chips. There was a 3 min delay between all of the runs with the engine idling. This was done to eliminate the effects of cooling between chip programming and swapping. It also provided the same “handicap” to all of the chips to adjust for any inequities in our science.

: Executive Summary: Four sets of chips were tested: Conforti, Dinan, Stock & Custom. Of the four, the worst was Conforti & the best was the custom made chip. BMW was second and Dinan was third. Interesting note is of the performance chips available only one, the custom chip, performed better than stock. It is well understood that the CSi is already performance tuned from BMW, so there is not a whole lot of room to play around. However, given the differences documented here, I would be inclined to believe that my custom shop could out perform chips for sale by either Dinan or Conforti for an 850i, Ci, etc. My cost for the chips: $500.00 + 135 in Dyno time. $635.00 was well worth finding out I was de-tuning my CSi with the so-called performance chips.

: My intent is to return to the shop and recreate all of the runs (except for the Conforti as I have returned the chips) when my Extrude Honed/Jet Hot coated intake and exhaust manifolds are installed.

: Here is a walkthrough of the spreadsheet:

: FOR EACH CHIP SPREADSHEET:

: The first row is the chip type: Custom, Dinan, Conforti, Stock.

: The following rows up to Driveline Adjustment Factor are self-explanatory and are reported by the Dyno.

: The Driveline Adjustment Factor row is where you can pop in a percentage of loss to calculate the readings at the engine. I set it to a 15% loss to begin with.

: -Interval is the time it takes to accelerate 100 RPM
: -Time is the time as measured by the Dyno
: -Power is the horsepower at the rear wheels as reported by the Dyno
: -Torque is the torque at the rear wheels as reported by the Dyno
: -RPM is self-explanatory
: -Adjusted Power & Adjusted Torque is the product of applying the Driveline Adjustment Factor percentage to the numbers reported by the Dyno
: -Peak is a formula that shows the highest value in a range. The peak row has the peak HP, Torque, the RPM at for the peak HP, the RPM for the Torque, the peak for the adjusted power, then the adjusted torque.
: -Minimum is the opposite of Peak.
: -Average is self-explanatory

: FOR THE SUMMARY SHEET:
: The comparisons at the top are fairly self-explanatory. The Peak/Average section says that: The custom chips provide 6.3 more HP than the stock chips at the peak, but only .58 more HP when averaged; 4.5 Ft. Lbs. of Torque peak, but 6.52 more when averaged; and the time interval from 1800 to 6000 RPM was .17 seconds faster than the stock chip.

: The M5 sheet is there for fun. The guys at the shop let me have it. Keep in mind that the M5 run was done in 3rd gear while the CSi runs were conducted in fourth.

: I am sure there are going to be questions. I will answer all as best I can.

: Len Cacioppo