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Subject: Engine chip test results - Part 1: Stock vs Dinan Author: erwin : member since November, 2007 : 880 posts Posted on: 2007-12-18 15:56:37

My plan was to test stock vs Dinan vs wokke_2000 chips. I was running Dinan, I still had the old stock chips, and my new wokke_2000 chips had arrived. Finally, I had the time and good weather to perform the testing.

The plan was:
1- Put the stock chips back in at home
2- Drive to my selected testing area (not a track - shhhhh)
3- Test the stock chips
4- Install the Dinan chips in the field
5- Drive around a bit to get the computers comfortable
6- Test the Dinan chips
7- Repeat 4-6 with the wokke_2000 chips

The reality was:
I had the wrong wokke_2000 chips, and they didn't work at all. I only found this out after testing the other two sets.

Future Plan:
Once I get the correct set, I'll retest Dinan vs wokke_2000. I doubt I'll go back and re-do the stock set. Since most likely the ambient conditions then will be different, the results will probably not be comparable. I probably won't get the new set for a couple of weeks at least, then I need spare time and good weather to align.

Test results:

Barometer: 30.22 in
Humidity: 87%
Temp: 53 F
Wind: minimal
Gas: 1/2 tank, 89 octane (american scale)

0-60 0-100
Stock
1 7.83 18.03
2 7.60 17.69
3 7.64 17.66
----------------------
avg 7.69 17.79

Dinan
1 7.67 17.88
2 7.62 17.54
3 7.61 17.07
4* 7.55 17.31
----------------------
avg 7.59 17.31 (last 3 runs only)

wokke_2000
1 DNF
2
3

* I only intended to do 3 runs for each test, but with the newly installed Dinan chips and with a significant drop in time with each run, it seemed the computers were still learning, so I did a 4th run.

Test procedure and conditions:
Transmission in sport mode, shifter on D. Using a hand-held stopwatch, start the clock simultaneously with throttle smash from idle. No power braking. When the speedo reaches 60, click the split-timer, when the speedo reaches 100, stop the watch. Also, hit the brakes.

Of necessity, the starting line was at a slight downhill. It straightened out within 200 feet and was level after that. Before the runs, the car was stationary at idle with the brakes on, with the left foot on the brake. The right foot was poised above the throttle. Thus, the elapsed times do not include foot movement, but do include time for the throttle to go down and for the car to gather itself up and get moving. I believe magazine tests use instrumentation that starts timing when the car moves.

Also note I am running larger than stock size rear tires. They are 4% taller, so when my speedo says 60, I'm really going 62.4 mph, and when it reads 100, I'm going 104 (assuming the speedometer is accurate). So, my results will be slower than true 0-60 and true 0-100. This doesn't matter for my purpose: I'm comparing chips, not myself against a magazine car test.

Driving Impressions:
I've been driving the car with the Dinan chips almost since I got the car a year ago. I was expecting the stock chips to seem slower, but they did not. This was possibly due to the fact that this day was colder out than is had been, and the car just ran better.

However, after driving around a bit, I noticed there was a lack of urgency in how it revved at the upper RPMs. The car was still quick, just not frentic over 4500 rpm. Other than that, it was hard to tell the difference in normal acceleration (all my driving was done in sport mode).

Also, with the stock chips, the car went back to making more of the distinctive 750 wail as it revved. Note I have the powerflow open cone air filters, which makes the car emit a nice growl when you open the throttles. With the stock chips, the growl was subdued and the wail more prominent. Weird how changing the chips can change how the intake sounds.

The other thing I noticed with the Dinan chips was the distance required to reach 100 was much shorter. It didn't occur to me to make note of where I reached 100 with the stock chips, but after the first Dinan run, I was surprised with where I was on the course.

Now, with the wokke_2000 chips, there was a huge difference in how the car sounded and in the acceleration (the engine didn't start, remember?).

Stay tuned for Part 2: Dinan vs wokke_2000 (w/ correct chips).

Erwin 89 750iL Lowered (a little)

Engine Dinan chips (Wolf_2000 chips on their way) PowerFlow Intake Air Filters Royal Purple 20W-50 In process: Custom Cold Air Boxes Interior Phone removed, replaced with cut-to-length dash wood trim on hinge E38 Shifter Knob M-Tech 2 M-technic Steering Wheel - air bag deleted E38 Self-Dimming Mirror 2B Installed: E38 shifter surround plate and boot Audio BMW Business CD Player "CD43" Head Unit Refurbished factory amp w/equalizer Bass blockers (300hz/4ohm) on stock front kick panel speakers Rear deck speakers: Alpine SPS-13C2 5.25" 2 way 175 Watt Subwoofers: 2 JBL GTO804 8" 4-ohm subs Subwoofer install: custom sealed enclosure mounted behind ski bag opening Subwoofer amp: Alpine MRP-M450 400w MONO CD changer relocated to driver's door bottom pocket actuated by bio- mechanical arm controlled by semi-intelligent nut behind the wheel Suspension H&R Lowering Springs (1/2 coil removed from fronts) Koni adjustable front shocks Stock rear shocks (self leveling) Racing Dynamics Stress Bar Stock front sway bar Dinan rear sway bar - 21mm M5 aluminum lower control arms Front tires: 245-40-18 Goodyear Eagle F1 GS-D3 on 8.5" EuroTech rims Rear tires: 275-40-18 Michelin Pilot Sport PS1 on 9.5" EuroTech rims Exterior 25% Side tint 5% Rear tint BMW Mud flaps - rears trimmed to tire width Rear fender lips rolled Zymol wax Way too many paint chips touched up Brakes Front Rotors: 850CSi, 324 X 30 mm, cross-drilled and slotted Rear Rotors: stock size, cross-drilled and slotted Pads: Hawk Performance Ceramic (may switch to HPS) Stainless steel lines Racing Blue brake fluid

• Engine chip test results - Part 1: Stock vs Dinan - erwin 2007-12-18 15:56:37 (831 views)
  • How were they the wrong chips? When you install them..... - beach911 2007-12-18 18:55:54 (135 views)
    • I got the 352, needed the 156 chips (pre '92) - erwin 2007-12-18 20:12:48 (85 views)
      • tell me all about it when you do captain! (nt) - beach911 2007-12-18 20:59:38 (107 views)
    • I got the 352, needed the 156 chips (pre '92) - erwin 2007-12-18 20:09:06 (110 views)
  • Nice, looking forward to next writ-up (nt) - daryl12 91 735iL 2007-12-18 16:27:04 (75 views)
    • Bhamfal will make dyno test with my chips - shogun 2007-12-18 21:21:26 (139 views)