Very interesting, and I am glad that all is OK--especially you. You could do what I do--go about 2:30 or so.

 

Unfortunately this is good feeding time for deer.For some reason they like to feed near roads and jump out in front of you.It is very risky to go very fast at night in this area.The area is highly developed and the deer are not hunted, therefore they are plentiful.

The damage I spoke of earlier sounds drastic but if you looked at it it looks more like a minor accident.It does't take much to have a $4100 repair on a BMW.

I will answer your other posts on the other thread later tonite.

 

I don't know what I was thinking when I said go at night. You had already mentioned not wanting to do tests using your lights. OK, go at night, and leave your lights off.

 

Excellent idea Z ,I won't see what I hit .Then I can't blame all my nite driving problems on the Deer.

 

I am thinking that sometime modifying your car will eventually lead to worse performance. At least, that is what I have experience. I had the following modification on my car, ECU upgrade(+25hp/45Nm), Eisenmann exhaust(+5hp/7Nm), K&N air filter. I tried 0-60mph run with my friend who has a standard 645ci, and to my surprise this is the following 0-60mph/h test result:

My result-modified 645ci:

1st run: 6.45sec
2nd run: 6.37 sec
3rd run: 6.07 sec

My friend's result-standard 645ci:
1st run: 5.83sec
2nd run: 5.75sec
3rd run: 5.76sec

Both of us test during the same time, using similar testing equipement(G-tech Pro) under the same weather condition. I tried 3 drag races with him, and his car start pulling away from me right from the start. We come to a conclusion that these factors might be affecting my car performance:

1. I have bigger wheels and tire combination(20x9/10.5" wheels) that might be hurting accerleration time.
2. My ECU upgrade might not be effective at all.
3. I have the 15.3 version of CIP, while my friend's has the 17.1 version of CIP

Do you guys have any opinions on the outcome of my testing?

 

Very interesting. The 20" wheels should make a small difference since I assume that you where not able to get low enough profile tires to maintain the stock rolling diameter. Also, the 20's and their tires will add a little weight. Is there any other reason your car would weigh significantly more--including driver weight, amount of gasoline, etc? Also, is his car older and, thus, better broken in? Finally, what about off-the line techniques? Were they close enough to the same? In this regard, you could try driving each others cars. If all, or many, of these factors were biased against your car, then the results you mention could be possible. And, of course, the mods could be affecting things. What did you get for your respective HP readouts?

 

If you really want more "solid" answers, try performing an A-B test. This requires a little more work, but it cuts down on the number of variables and yields results that are more indicative of what's going on with your car.

Don't throw out the data you've gathered already; we'll call that sample 'A'. Now, if you still have the stock wheels, put those back on and retest. This way, everything else is the same as test sample 'A' except wheel/tire combo. Your new results are sample 'B'. Compare 'A' against 'B'.

As don mentioned above, try to set your car under the same conditions as your first test (same driver, same fluid levels, same launching technique, hopefully the same weather conditions, etc., etc.).

You can progress however far you want in returning your car to it's stock configuration, although I don't think you're going to want to reprogram the ECU to stock. Just keep that as a mental side-note when drawing your conclusions.

This A-B test method is more valid than comparing your car to someone elses. You can take two brand new cars off the dealer's lot with similar mileage/weight/fluids/tires/yadda, yadda, yadda, and still get different results.

Good luck and thanks for sharing.

 

Ehm both of us weight almost the same. I might try switching car with him and see how much difference in our launching method will contribute to the acceleration time. My car has 4,100km, while his car has 2,200km but I think my friend's car has better breakin, because he drives the car at different rpm range. I'll try to carry out different test and change to stock wheel and tires. I'll keep you guys posted Thanks for your input guys

 

You are very welcome. Good luck.

 

To All:

My car's performance has continued to improve significantly since I demodded my car. I am convinced that, in my case, my mods hurt performance, and perhaps the learning ability of my car, after my 20.01.00 update. My car is flying high again now. If you are interested, then check out the g-meter testing thread or the straight-line performance thread on the main forum.