HOT CHIPS

BMW M3

Standard:

This machine as an already potent performer, with 210kW (282bhp) driving the rear wheels to a (tested) 6.1 0-100km/h time - excellent for a normally-aspirated 3-litre inline six-cylinder. The M3 only needed 4.94 seconds to dispatch the 40-60km/h range - using FIFTH! Other hot times recorded include a 14.71 second quarter-mile time (157km/h), and a 2.84 second blast for 60-100km/h in second gear.

With chip:

Evolution 2 Motorsport supplies the special-tune chip to Powerchip for this car. The problem lies in the M3 having TWO chips that control a variety of functions - it's not possible, therefore, to simply exchange chips. They must be completely re-programmed. The up-side of this unique conversion is that the car still keeps the standard program in it's memory. The M3 therefore offers the option of using either program (simply flick the switch Powerchip installs on the dash).

The hotter chip extends the revs to 7500rpm (up from 7280rpm) and removes the speed governor. Peak power develops slightly higher at 7150rpm (as opposed to 7000rpm). Interestingly, the variable power-steering assist unit is an electronically controlled item - Powerchip decided the increase in performance necessitated an upgrade in steering response as well. The weighting remains the same at parking speeds, but firms up at every other point. This upgrade requires the power-steering pump to be re-valved.

The upgrade chip information also eliminates pinging, smoothes gearchanges and gives more mid-range torque. The M3 is just smoother overall to drive (no hesitation anywhere). For those wondering, the Evolution 2 chip is very similar to the chips used in 'Group N' BMW race cars.

BMW M3


Stand Chip
0-100km/h 6.14 5.84
S 1/4 14.71 14.31
60-100km/h, 2nd 2.84 2.80
80-120km/h, 2nd/3rd 4.40 4.05

BMW 535i (E34 - stage II)

Standard:

The BMW 535i (3.5-litre six-cylinder model) is a good package - it wouldn't be a BMW if it wasn't. it'll do everything you ask it to do, with a little 'spice' mixed in. Go a little harder, and you'll encounter two large flat spots where the power just falls flat, then picks up again (around 3000 and 5500rpm). There's also a slight lag between gearchanges and an idle that isn't as smooth as it should be.

With chip:

Immediately noticeable was the improvement idle - now a steady 800rpm (not as rough or with the fluctuations of before). Hard stabs on the accelerator also indicated the slight pinging was gone, while full-blooded runs provided an extra 500rpm to play with (fully useable too).

A seamless power delivery to the old redline and beyond means the flat spots around 3000 and 5000rpm are gone. The engine note has improved, mirroring the good gains in acceleration. Fuel economy is about the same, though emissions run a little richer (still safely within EPA limits).

Powerchip says the performance gain is attributable to the 16kW it extracted with the chip, which raises power to 171kW/229bhp - an excellent figure for an engine of this size.

On the track, the 5-series cut a full second off most of the times recorded using the standard chip, with some runs up to two seconds quicker. Particularly noticeable was the drop in the 0-100 figure (2.5 seconds).

BMW 535i (E34 - auto)


Stand Chip
0-100km/h 11.1 8.60
S 1/4 17.18 16.39
60-100km/h, 2nd 5.87 4.76
80-120km/h, 3rd 9.03 8.19
AR&T SUMMER 1995 - 7

Pages: 1 2 3 4 5 6 7 8 9 Home