In Reply to: Re: Is the performance gain noticable w/Jim C. chi posted by Baer on April 02, 2000 at 23:46:01:
: The Jim C. chip is great. I did notice an increase in power and the smoothness of the power is prominent. I also got a boost in gas mileage. The chip is a great upgrade for the 525i, and from what I have heard and read, Jim C. is the best.
one of the guys on the our E34 M5 mailing list posted his dyno graph in which he ran Dinan and Jim C chip on the same day at a dyno session at Turbo Tune US Ltd in Greensboro NC on 03/04/00. The best result came from the Dinan and it consistently had more hp and torque.
You need to sign up then goto the vault section which is where we post pics. There is a detailed scan of the dyno session. I also run a Dinan in my E34 M5 and like it alot. despite alot of peoples claims that the Jim C chip superior, I have never seen a dyno.
1991 E34 M5
Rear wheel hp which is about 15% less than advertised crank HP.
Dinan - 281hp/323hp crank & 242.7 ft lbs torque
Jim. C - 273hp/313.95hp crank & 239.7 ft lbs torque.
If you observe the graph you will see the Jim C chip produces less hp everywhere....
John Robinson from down under who was complaining that after he installed the Jim C chip he only saw a few hp on the dyno was correct. A few people came down on John blaming the fact that his car was down under and was tuned differently which is why the chip did not produce a noticeable increase in hp, it appears there was nothing wrong after all. I should note that my Dinan equipped M5 can pull on my friends 1991 Jim C equipped M5 at the end of the straight at PIR. he is switching to Dinan too...