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Free Horsepower. MINI Cowl Mod DIY

Remember that an internal combustion engine is really just an air pump. In the Spring 2006 issue of MC2 Magazine Matt Richter explains the Ideal Gas Law in simple terms. Now you’re thinking Zzzzzzzzz, but it’s really very interesting.

The stock Cooper S is able to get a 50 hp boost over the Cooper by virtue of the supercharger. By increasing the pressure of the air entering the combustion chamber, the engine is able to produce more power with the same volume of engine displacement. The increase in pressure is accompanied by an increase in temperature — hence the intercooler. The intercooler drops most of the temperature gain while retaining the benefit of the boost. Make the intake path more free flowing and increase the pressure gain some more.

The first step is to replace the stock filter element with a cold air intake (CAI). Make the pulley smaller, the supercharger spins faster (produces a bit more heat) and the pressure increases some more. The next step is to increase the amount of air available to the filter. That’s where today’s mod comes in. This works if your CAI leaves the stock cowl in place. And it’s free.

The idea is quite simple: Modify the cowl behind the air filter to draw air from the cowl vent below the windshield. The panel behind the intake is not structural, but it still makes sense to remove it first before making the modification so you don’t mess up your brake lines which are directly behind the panel. In my case, I first bought a panel to modify from MINI (part number ) so I’ll still have my original piece should I ever need to swap back. (OK, so not really free, but still cheap.)

I drilled six holes with a hand drill above the center line in the panel. Randy Webb has posted very clear instructions here. The procedure takes about 30 minutes. You remove the cover to the intercooler; your CAI; disconnect the ECU; pull out the lower air box; and pull out the panel. Replace the panel with your “holey” one and reverse the order above. At low RPMs you will not notice a change in the intake noise, but above 5,000 RPMs there is a slight increase in the supercharger scream. I actually enjoy that sound. Here’s what it looks like when it’s all back together.

finished mod

Update: Jan 2015. Randy has long shut down his MINI site so I pulled the instructions from the internet archive. No photos, but simple enough to follow along.

What Lurks Within

I recently made a couple of mods that have really changed the character of the MINI. The latest mod you can barely see lurking behind the rotor in the picture below. I took out the stock sway bar and replaced it with an Alta adjustable 22mm. Even on the softest of the three settings I can feel the change in handling. The MINI always had minimal body roll in corners, but now it’s really flat. It also had a tendency plow, but now it’s neutral.

The installation process is fairly straight forward. Here’s a couple of helpful hints though: Attach the bar to the subframe before you re-attach the subframe to the chassis to save your knuckles and remove both struts makes it much easier to fish out. Total time for two people who have never done this before on a MINI was about 3 hours.

pulley

The other change is even harder to see, but easy to feel. I went into Behe Performance to get a brake flush and found out they were having a Pulley Special: A 15% Reduction Pulley installed for $235. I couldn’t pass that up and what a difference it makes. If you are still sitting on the fence about a pulley upgrade you should jump in. I cannot imagine any other single mod you could make that transforms your car as much as this.

So you may be asking yourself why doesn’t the car come this way from the factory in the first place? So far, I’ve ditched the “S-Lites” with runflat tires for R-90s with Goodyear F1 GS-D3’s. I got $600 for the S-Lites which is what the R-90’s cost so the net cost was the price of the new tires, which after rebates was about $500. I bought a Cold Air Intake which I installed myself. ($125). MTH Car tune ECU remap (I got it when it was only $60). Madness Pulley installed ($235). EBC Greenstuff brake pads ($170). And finally the Alta Rear Sway Bar ($169.) Grand Total: $1369.

I’ve reduced un-sprung weight by 48 lbs; improved the ride quality, handling, braking, and acceleration; my gas mileage has improved by 3-4 MPG; power comes sooner and the engine revs more freely and I’ve increased horsepower from 163 to about 185. For another $700 I can get a free flowing exhaust and push horsepower up to 190. Compare that to the JCW kit that was made for my car: It didn’t include the air intake, suspension, or brake upgrade and increased horsepower by 37. The improved JCW head probably still wins on improved torque, but look at the cost: It’s almost $5K without the 10 hours of labor required to install it compared to everything above for about $2,000.

Imagine the problem from MINI’s Perspective. You could have added better brake pads that weren’t made of chalk for a minimal cost, say $50. $75 would get you a cold air intake, and I’m sure you could have requested a smaller diameter pulley at no cost. Software changes would cost nothing, and larger pipes in the exhaust would be minimal, but let’s say $200 for the sake of argument. A beefier sway bar might also cost $20 and it wouldn’t kill them to add adjustable camber plates in the front for another $200. What would you have? A nearly 200 hp Cooper S that costs only an additional $600. The problem would be that this car would have about 200 hp and there wouldn’t be enough of a gain in the JCW package to justify the additional $5,000 price tag. So ultimately it isn’t a matter of cost or performance, but positioning. If you want to sell 3 cars, one at 115 hp and the other at 210, you need to position the third in the middle, which is right where the stock Cooper S turns out to be. Not because it isn’t capable of more, but because you can’t justify the middle car being $5,000 less than the JCW and $5,000 more than the Cooper if you choose otherwise.

Thanking About Getting White Wheels?

Winter is slowly losing its grip on the Mid-Atlantic region.  That means it is time to start thinking of getting out the summer tires, firing up the MINI and heading to the track.  Track days and hot laps are still weeks away, but I couldn’t resist testing out the new track day wheels.  In a complex set of transactions involving some 30 year-old Alfa parts, a bunch of spare MINI parts, and some pieces of something I still can’t identify but someone wanted anyway (eBay is great), I got a spare set of wheels and tires that I can trash on the track at virtually no cost to me.  So of course when I headed off to the local MINI shop for my tech inspection, I had to put them on to try them out.  They look pretty cool — perhaps increasing the slot-car look — I’m not sure yet what I think.  Anyway the photo above shows what they looked like the first day, and here’s after the 3rd day….  That’s sort of the dirty little secret about white wheels I suppose.

koseis

Weather Control Experiment

Original Post: January 21, 2006. Given the unseasonably warm temperatures of the last few days, I thought I would try a little weather control experiment. I got out the hose and Mr. Clean Auto Dry kit and decided to wash the MINI. Imagine that: the 21st of January in Maryland and I’m outside in a T-shirt washing my car. If my calculations are correct, this should have a direct impact on the jet-stream and divert an unplanned Nor’easter our way within days. Stay posted for unusual weather patterns…

Update: January 26, 2006. Success. For the first time in several years, we had a brief period of snow-thunder this evening. Sort of an odd experience to see lightning and hear the thunder while it is snowing. I think that’s about proof positive of the effectiveness of my weather control experiment so I decided to cancel future cold weather tests. I put the wheels with the all-season tires back on the MINI and will attempt to reach temperatures into the ’60’s again in February.

snowmini2

thermoFebUpdate: February 15, 2006. Any wonder why we keep getting sick? On Sunday, we got almost 16 inches of snow. Three days later, it’s almost 60 degrees outside. Maybe if this were April, I’d understand, but the second week of February? That’s nuts.

FebSnowMini

Parts Number Lookup

Looking for a way to find BMW and MINI parts numbers? Check out RealOEM.com online. Search by body R Code and build date (R50 for Cooper, R53 for Cooper S, etc.) Build date is on the sticker on the Driver’s side door jam.