THE BANG-FOR-YOUR-BUCK LIST

There has been an ongoing debate for decades regarding the top bang-for-buck mods for your E30. Even then, there is a level of subjectivity as to what is "cheap" mod and what is a worthwhile mod. Here is your one-stop shop for the Top 10 mods for your E30, including risks, benefits, and even a little persuasion to get you onto the track to give these products a try.

1. BACK-TO-STOCK MODS

Don't underestimate the value and importance of getting your E30s stock functions working! There is a wide variety of products available to get your car that modern look, yet maintain that stock feel, including parts for looks such as an 'is lip, and simply replacement parts such as replacing the frequently burnt replacement with an LED OBC lightbars,, or getting your odometer back to working with some Odometer gears. Gotta get that E30 working and looking good before doing any modifications!

There are many other items that are necessary, including proper alignment, suspension refresh, and of course, no oil/coolant/fluid leaks!

2. PERFORMANCE CHIPS

A performance chip is probably one of the most impactful upgrades to your E30. Some models benefit from chips more than others, but they always free up at least some more horsepower. 

Here's a short list of the gains you typically see with a chip: Of course, these are general ranges, not specific numbers, so make sure to check with the chip manufacturer for specifics on a certain chip!

 

	87-92 325i	90-91 318i	85-87 325e	88-91 M3
Engine Type	M20B25	M42B18	M20B27	S14B23 / S14B25
Horsepower	+15 @ 5,000 RPM	+13 @ 5,500 RPM	+23 @ 4,500 RPM	+25 @ 7,600 RPM
Torque	+15 @ 5,000 RPM	+15 @ 2,500 RPM	+28 @ 4,500 RPM	+18 @ 6,000 RPM
Rev Limit	6,900 RPM	6,900 RPM	5,300 RPM	7,800 RPM

 

Chips typically range from $225-$300. Do Not Buy eBay Chips. Not only is it possible that you will see no gains if you install one of these chips, but you can also damage your engine if the chip isn't programmed correctly. A small list of vendors that supply high-quality chips includes MarkD, TurnerMotorsport (Jim Conforti), Bavauto, Dinan, etc.

Installation is a snap with a simple removal of the ECU, dislodging of the OEM chip, and inserting the new chip. Easy Peasy!

Note that chips require additional modifications to get the most out of the gains, such as bigger injectors and/or a bigger AFM. While not providing as dramatic of an impact as a chip, the two other mods that can provide some impact to your E30 are a proper Air Intake and Exhaust, both of which we will cover here!

3. AIR INTAKE

The most popular, easiest to install, and cheapest mod is probably a free-flowing intake filter or a Cold-Air Intake. It's common for people to throw on a free-flow air filter, such as a K&N filter, but neglect to realize that it's sucking in hot air from the engine bay! So if you're going to do this mod, you want to ensure that you create an intake that sucks from outside of the engine bay, to prevent the intake from sucking in the hot engine air.

K&N is the most ubiquitous household name when it comes to free-flow intake filters, and lucky for the E30 enthusiast, they even offer a cold-air version as well!

This mod alone does not increase horsepower. But combined with a chip, and you now have an engine that wants to breathe, and actually, now can breathe!

4. EXHAUST

The options here are endless, including free-flow headers, catalytic converters, removal of resonators, or replacement of the heavy stock muffler with a light aftermarket. No matter what, you're saving weight, which increases performance.

So let's keep it simple for now: Replace that heavy rusty muffler with a free flow supersprint, ansa, tri-flo, or MagnaFlow, Remus, Scorpion...etc. You can get a cat-back exhaust system, which includes the pre-bent tubing with fittings, clamps, and hangers. Here is an example of MagnaFlow's Cat-Back system.

These systems range in the price of $1200 (complete cat-back system) to as little as $140 (just a muffler). The cheaper you go, the more aftermarket modifications and welding you'll have to do, so if you're creative and resourceful, you can get better sound and more power for a fraction of the cost of a complete bolt-on system!

Do not get FlowMaster. They do not mate well to the exhaust note of these high-revving engines. The glass-packed (fiberglass) are the way to go for an E30 Mod.

If you decide to go with aftermarket headers, steer clear of the eBay OBX headers. Even though they are cheap, they have had confirmed fitment issues, they use inferior thin walled steel, and have been known to corrode. But most of all, they are not equal-length headers and have no testing to back up the claims of increased power. In fact, you will likely decrease your power!

When it comes to headers, stick to the brand names... headers are one part of a tuned system and they do show more power with a chip, because they provide a tuned back-pressure to extract exhaust gasses, creating negative pressure on the exhaust stroke.

5. POLYURETHANE BUSHING

Next, those old, tired rubber bushings have got to go! For the avid auto enthusiast, poly bushings are the new norm and dramatically improve handling and responsiveness. The best part? You can easily install this yourself without any special pullers or presses! Choose from 80A (soft), 95A (harder, race), or for the extreme Delrin. More information will be in a future blog, but see below for a sneak preview to choose what's right for you. Best of all, there's a lifetime warranty on the bushings!

80A – Perfect for the OEM Feel with a bit of responsiveness. Rest assured that there is no compromise for comfort here, yet your E30 will turn, brake, and accelerate much more precisely and predictively.

95A – Recommended for motor swaps, very aggressive drivers, or otherwise track use. These further increase the responsiveness of all aspects of driving and provide the ability to have a more spirited driving experience.

Delrin – Harder than 95A and one step below solid mounts. These will allow virtually no play between your engine, transmission, and subframes. The feel will be a very sporty feel recommended for race applications.

Garagistic offers Polyurethane Bushings in a wide variety of applications, including drivetrain, differential, trailing arm, control arm, and rear subframe bushings.

6. WHEELS/TIRES

This is an incredibly broad topic, and will be discussed in further dedicated blog posts.  But to keep things simple, here are the things you need to know about the E30.

• 57.1 – This is the centerbore of the E30. If you get aftermarket wheels with a different centerbore, you will need hubcentric spacers
• 4x100mm – This is the lug pattern for the E30 and is a must-have when fitting new wheels, unless you have a 5 lug.
• Low Offset – Anything above +20mm is likely too high and you'll have rubbing issues and/or need spacers.
• Diameter/Width – 15" diameter is appropriate for an E30. Many go with 16" and if you want more extreme, you can go 17". 18" and up is not recommended.

Tires is just as broad a topic and there are certainly tradeoffs no matter what you decide to go with. Some questions you must ask yourself before buying tires is:

Will I be racing? I might want a softer rubber compound.

Am I looking for max gas mileage? Then an all-season with a 400AA treadwear is most appropriate.

...etc.
Remember that no matter what wheel/tire combo you go with, you will be sacrificing one aspect for another. Larger wheel/tire combos rob the car of more energy as they are heavier and have more mass to spin further away from the center of rotation whereas smaller wheel/tire combos have less rotational inertia and can effectively increase the acceleration of the car. 17's just look cool though!

At the end of the day, it all comes down to your personal agenda for use and your preference.

7. REINFORCEMENT/BRACING

With more power and stiffened suspension comes an increased need to provide additional bracing. Suspension reinforcements are not only popular, but they're an indication that you not only care about going fast, but also about doing so reliably and safely. Garagistic offers a wide array of subframe reinforcement kits for both the front subframe, the rear subframe, and both front and rear strut bars.  You can either weld the kit to your own subframe or send your subframe to get completely welded for you!

For those looking for some insane support underneath, check out the X-Brace, race-proven, reliable, and performance-oriented.

A new product that just came out to further reinforce the flimsy stock E30 front subframe is the clever front control arm ball joint reinforcements. These are critical for race applications and ensure that your E30 is always on the straight and narrow. Installation is easy and accessible, so give it a try!

8. COOLING UPGRADES

There are a couple of upgrades that can help your engine run cooler, especially in those hot summer months waiting in traffic! Stock thermostats close at 99C (or 210F). But you can adapt a plug and play thermostat that opens at a lower temperature to allow the hot coolant to get to the radiator earlier. Here is an example of an 92C, 80C, or even as low as 71C thermostat. These can be found many places in the $20-$30 range.

If that's not enough, you can always turn those cooling fans on earlier with a lower temp fan switch, mounted conveniently in the radiator itself. It monitors the temperature of the coolant and activates both the low and/or the high speed radiator fans to activate the cooling earlier as well. Again, stock switches open at 99C, so having a switch that opens at 80C/88C (3 prong below), or 82 degree (2 prong for older models) can help immensely in keeping your M10, M20, or M42 cool

Be aware that there is a shortcoming to earlier opening thermostats and switches: The lower degree thermostats open at lower temperatures for better cooling but can reduce heater output when outside temperature is colder.

9. SHIFTER UPGRADES

One of the best ways to improve the feel is to upgrade one of the most widely used components on your car: the shifter! Changing the length of the rod below the cup actually allows a shorter shift throw and a notchier feel. As a result is one heck of an improved driving experience with every-single-shift. Driving becomes sportier and more connected with the road than you ever have before. 

The most popular mod here is either the OEM Z3 Shifter, or the adjustable throw Garagistic Supreme Shifter, which positions the shifter perfectly in the E30 and provides the ability to adjust the shifter's throw length to match exactly how you want the shifter to feel. While you're at it, you might as well replace the bushings for your shifter assembly, upgrade to a DSSR, and swap out the old selector joint for one of our billet "Standard" Selector Joints for an even tighter feeling shift. More detailed technical information about the dynamics of a short shift kit is in an upcoming blog, so stay tuned!

10. MOTOR SWAPS

This will not only be covered in many more detailed blog posts, it will be covered in so much detail that you'll be considered an expert in the subject yourself! Garagistic specializes in many engine swaps, including E30 M30, M60, M62/S62, and LS1. There are many parts supplied by Garagistic to get you started on the right foot!

The list goes ON!

Want to be the ultimate specialist in your community? Purchase the E30 M30, M60, and M62/S62 write-ups with hundreds of annotated pages, tables, diagrams, and wiring schematics showing you how to get your swap done, from start to finish. These can be found at our partner, www.macalent.com for your convenience. All swap parts are supported and supplied by Garagistic to get your swap started, moving, and completed so you can move on to the next big project!

Visit the Garagistic Store for all of your favorite BMW E30, E36, E46 Parts and much much more!