the M42 318iS Author:
This is a compilation of things that are necessary to get real performance
out of the M42 engine that you use in a street/auto-x/mild track use car.
These are items that will improve the cars performance and not sacrifice
any low-end torque, which you want for street driving. These are all pretty
much "bolt-on" mods, using the engines factory internals. If
you want your 318iS to really fly on the street, these are the things
you need to do:
Computer chip - This is a very basic and inexpensive modification
for your car. Chips usually run about $200-$300 and are very easy to install.
A chip on a stock M42 will bump the horsepower to about 145 (from 135)
at the peak. The low-end torque is increased as well to improve everyday
drivability. Though the real improvement comes at the top end; the chip
widely increases the power band on the M42, from 4600-6000 to 4500-6700.
I recommend Jim Conforti chips, as they are unarguably the best on the
market for this motor, at a good price as well. On a side note, you will
find the M42 makes a very distinctive "howl" from 6700-7200
rpm that reminds you that youíre driving an honest-to-God BMW.
Flywheel - A major problem with the M42 was that it had
BMWís 'dual-massí flywheel; yes, it weighs almost twice as much as a 325i
flywheel (as the name would suggest), at 28.5 pounds. This is a big problem
and absolutely kills 1st and 2nd gear acceleration. Ever wondered why
your 318iSís 0-60 was so slow? Well, the flywheel is one of the reasons.
There are 3 options to fix this: 1) use a 325i flywheel/clutch or 2) buy
an aluminum flywheel for your M42's clutch, and 3) an aluminum flywheel
for using the 325i clutch. Buying an aluminum flywheel for the M42 runs
about $500-700 but is very light, and requires no modification to be fitted.
M42 aluminum flywheels are about 12 pounds, and 325i aluminum fly's are
about 8 pounds. The 325i flywheel requires a few other modifications to
be fitted in the 318iS. Hereís what you need: 325i flywheel, 325i clutch,
325i pressure plate, 325i drive-pinion for the starter motor, and a Ď78-í83
323 throw-out bearing. Replace all these with the 318iS parts and it bolts
right together. After all is said and done, your 318iS will have a LOT
better acceleration in the first few gears, and deceleration will take
place much quicker, which helps on the street and in the auto-x.
Rear end gear - The 318iS is equipped with a 4.10 limited
slip from the factory, but you can do better. The desired gears out there
are the 4.27 and the 4.45. You will find the 4.27 in E30 318i convertible
5 speedís and the 4.45 is in E36 318i automatics. The 4.45 is a wicked,
wicked street gear but will stick your RPM way up there on the highway.
The 4.27 is a good compromise of performance and everyday use. It should
be known that to make a 4.45 work, you have to swap the gearset into your
E30ís differential, or find an automatic 318ti, which has a 4.45 and also
has trailing arm rear suspension! So the E36 318ti 4.45 bolts right onto
an E30, though finding an automatic 318ti with LSD may be difficult.
Adjust the cam timing - You know how on the E30 M3 you have
to buy a $300 kit with adjustable cam sprockets to tune your cam timing?
Not on the 318iS! The M42 is equipped with tunable cam sprockets from
the factory. So pull your Cosmoline covered valve cover off and with the
proper tools you can tweak your intake and exhaust cams up to 6 degrees
+/- to provide more top end horsepower or more low end torque. See, you
donít have to blow a grand on a set of Schrick cams to make your M42ís
cams a little hotter. The best setup is to adjust the intake cam to 5
degrees (advanced) and leave the exhaust cam alone. I would recommend
having a shop do this work.
Muffler - The 318iS is equipped with a very free flowing
exhaust manifold and center section with 2.25" stainless piping.
The bottleneck in the system is the muffler. Thee are a few options for
this. The first is a cat-back system, which replaces the piping and boxes
behind the catalytic converter. Supersprint makes an excellent cat-back
system that runs about $400. You can also simply replace the muffler.
There are a variety of mufflers on the market but there is one that is
very inexpensive, sounds great (not too loud, but throaty), and fits an
E30 very well - it is made by Walker-Dynamax and is called the "Super-Turbo"
muffler. It is available from Summit Racing at the price of about $40.
We have had great success with these mufflers, and even use them in 3"
size on our E30/S50 cars.
Intake system - The 318iS stock airbox works well, but a
cone filter setup works better, but only if you have a well-built heatshield!
Get a large K&N setup with the AFM adapter and all. Go to Home Depot,
buy some Reflectex and build a "cool-air" system by cutting
and fitting a heatshield. It is worth it in the end. While you are working
on the intake, get the secondary plate of your throttle-body bored out
3mm to 57mm. This will make a difference.
Summary: You will find that with a little time, a little cash, and a little
elbow grease, you can tune your 318iS to really perform. William Zubrick's
318is with a properly built intake, Supersprint cat-back, and Jim Conforti
chip puts 131hp to the wheels on a chassis dynomometer. Enjoy!