I searched for a while, but could not find whether the JCW upgrade was meant for a MCS that did not have the full JCW kit installed. I am looking for some easy mods that will not void my warranty, but will boost my base performance. I definitly want a new intake so i can hear the supercharger and the motor at high RPM's, and i figure the intake and the injectors will compliment each other nicely. Then next year I will add some sort of cat back exhuast. Also, is the ECU reflash intended for a car that already has the JCW flash, or intended for a car that has the JCW kit installed?


SO, is the upgrade kit meant/ good for a non JCW MCS?


Thanks for the info...


Ryan

 

The JCW Upgrade Kit (intake, injectors and ECU remap) is intended for a MCS with the 200 PS JCW Kit. The JCW intake is sold separately for a non JCW MCS, with no ECU remap required. Unless you have future plans to go with a 19% pulley, you should sell the injectors to recoup about half the cost of the kit.

 

Ok, so the ECU flash is useless on a stock MCS motor, what about the injectors in conjuction with the intake? Or will the injectors not fit to the stock motor?


Thanks again

 

The injectors are just overkill unless you are sucking in enough air that the stock injectors are unable to keep up. Most people upgrade injectors with 17-19% total reduction on the SC Pulley to keep the car from running lean.

 

Okay, I will stick to a CAI instead. Now the question is do i get the JCW, with its electronic air valve, large price, and warranty preservation. Or do i get the Alta (or something) and just switch it when i go to see the service center.... but that is something that can surely be answered with a search..



Thanks again


Ryan

 

Wow, your header and some ecu re-tooling yields 207bhp?



cool, a header is behind everything i care about on my waranty....

 

Go with the Alta. Great sound, noticable "seat of the pants" dyno improvement and way cheaper than the JCW intake.

Joel

 

I really like my Alta CAI but there are reasons to go with the JCW.

The Alta is noticably louder. There's a very high pitched element to the noise just off idle that has taken me about a month to get used to. The Alta seems to make more power than the JCW. The filter is cleanable / reusable.

The JCW has the factory look going for it, is quieter and in general more subtle. The small amount of additional noise doesn't kick in until above 4500 RPM when the valve opens. The filter is expensive on the JCW.

It's a personal thing between the two - you just have to decide which one you prefer. And of course there are plenty of others to select from as well.

/gary

 

So far, the ALTA has the highest gains that I've seen (10 BHP).

 

the info you have received is generally correct. to state what has been stated before. with the stock MCS, the larger injectors and ecu flash dont make sense. the JCW intake without the flash and injectors is much too expensive. Dinan has a similar CAI that is cheaper and very similar to the JCW CAI.

Personally i would not be concerned about the warrantee and go with a 19% reduction pulley and the JCW upgrade (CAI, injectors and ecu flash). you will be very happy and have most of what the full JCW upgrade gives you for considerably less money. I did this and have had no problems for the past 11,000 miles. This combination actually gives you more torque at low RPMs than the JCW.

 

For starters.....A CAI will not void your warranty.

You can get the JCW Air Filter Kit Part# 13-72-0-395-132 which sells for $375. And the replacment filter is only $99.

 

I have a brand new 05 MCS and just installed the Alta intake after doing some research. I too like the looks of the factory JCW intake but just does not have as much gain as the Alta from what I have seen. I do not think the Alta voids the warranty though, does someone else know of this happening. You may also want to read Webbmotorsports site for performance gains. I have the 15% reduction pulley that is going on next with colder plugs. My car is a daily driver for my wife and I get to use it weekends. Reliability is very important and just can't justify going with the 17/19%.

 

CAI will only void the warranty of the intake, unless of course you're running with no filter element and sucking in debris, in which case you're a fool.

 

Hi: I have run both the jcw air cleaner and a turner motor sports air cleaner (which is manufactured by Rouge) on my 2005 copper s jcw tuned (which I love so please no JCW hate comments). First off, you can put on a CAI (whether alta or the Turner/rouge/whatever) and put back on the stock air cleaner when you get service. That issue aside...

the CAI is not a warrenty breaker.

I found, after using the jcw air filter for 5,000 miles, and then changing to a Turner Motorsports Intake (I had one from my previous cooper s).. that I like the Turner cai better. It is a bit louder, but I like that sound. There is an opening (from the JCW install) that allows air to get directly to the filter. I haven't dyno'ed it to compare, but dyno'ing is riddled with inconsistancies, in my opinion. My opinion is the JCW air cleaner is an improvement over stock, probably insulates better against heat that aftermarket, and may help with low end torque, but I like the sound of the Turner motorsport CAI better (which I bought from MINI of Peabody) I put my JCW air cleaner in a box to install again some day. Subjectively I think the Turner flows a bit more air, and may add a horsepower or two.

I say buy a turner motorsports CAI and do a airbox modification as described in the Webb Motorsports How to section or go with a alta if you want maximum horspower gain and intake sound...

 

 

ICU812 what is this reliability issue with the 19% reduction pulley? All the reduction pulley does is move the boost down the RPM curve. That means that the boost comes on at lower RPMs. The present redline is approximately 6700 RPM (this is from memory) if you shift at 6200 RPM the boost is the same, but at lower RPM. If you still shift at 6700 RPM you will over boost the engine.

Call me crazy but I can learn to shift at 6200 RPM and enjoy the added torque and have the same reliability as the stock pulley.

The issue with the 19% reduction pulley is when racing the car. On a tight course there is a tendency to shift at the redline in all gears, this is not good for the 19% pulley belt and it means that you are constantly over boosting the engine. In normal every day driving the increased torque at lower RPMs is great.

 

See what Randy has to say here http://store.webbmotorsports.com/ind...854f0e39971186

 

OOK.....Your shifting lower with added boost but everyone else ive seen ( including myself ) is shifting over 7k, so why would you want to shift sooner......Unless you seen your power fall off on the dyno, your on your own there.

 

Chows4us it is easy to read Randys explanation and come to the same conclusion. i agree with everything that he says with one exception, the belt issue. i have not had any problems with the belt i installed. if you read what he says carefully he constantly refers to high RPMs. i dont know how you drive, but most of my driving is below 5400 RPM. i occassionally do shift at 6000 RPM, but very rarely. i like the added torque at low RPMs.


Many people on this forum run the 19% pulley and i have only heard of ONE failure in normal driving (unfortunately i don't know the details). i have heard of many failures with the 19% on the track.

i think that you have to decide what chances you want to take, sort of a cost benefit analysis. Will i damage the engine long term? i really dont know. Do i like the added power and torque? yes.

i agree that the 15% pulley reduction is a safer alternative. The JCW package has this and it is warranteed by BMW. Every time you modify an automobile you change the variables that the engineers spent many years considering.

Good luck and happy motoring.

 

I was not aware of this fact, i had thought it was just a larger supercharger. That makes me feel a little more comfortable about the posibility of putting a 15% on mine. Of course, if it is a bigger supercharger, it is possible that it was built to handle the stress of a smaller pulley, where the stock supercharger is not...



Ryan

 

All they do is change the pulley like we are all doing already. On earlier models which didnt have a coating on the SC blades its a plus to add the JCW charger being the pulley is "15%" and has the coating the newer cars have now. There is no "larger" charger out there for these cars that ive seen besides people porting them out.

 

OH MAN! This really blows my mind, I was under the impression that there was a new SC involved. This should really make the case clear for adding a 15% reduction to my SC, due to the fact that BMW already does this on the JCW. It should make it dificult for any warranty voiding Shadyness to occur...

 

They do change the whole SC with the updated one thats in the 05 models now....Only difference is they change the pulley like everyone does now for added boost.

 

Any thoughts on performance by replacing ther JCW pulley with a 17 or 19% .Skip the warranty stuff , but I'd like to know if this is sure to cook my engine.

 

I cant tell you with my car being its only been 3-4months since ive got it but my friend had over 10k of haaaaard driving and not one issue....Havent heard anyone doing damage to there engine as of yet with a 19%. To find out more, id find someone with more than 20k on there car who has a 19% and see how the car is....Doubt you will hear anything bad. Other than a warranty thing i wouldnt worry.