Hi,

I just addaed a Milltek header to my 2006 JCW with 9000mi.

Sound: Excellent exhuast note!

performance: Lost performance. Throttle note crisp any more. depress accelerator and wait 2 seconds or so for pull to start.

With standard factory exhaust header when depressed accelerator no lag nice pull.

ANY IDEAS?

Does the ECU need time to aclimate?

Thanks in advance for any ideas /suggestions.

 

sorry...note enopugh coffee...

Performance: Throttle not crisp anymore. Definite lag.

 

did you reconnect your o2 sensor? mess up a wire? it might not be going into open loop correctly... or its just the design of the header...

 

o2 should be okay. No lights. Any other ideas???

 

I think Mike and the gang at JCW know what their doing.

Suggestions ... put the JCW header back.

Minibull

 

Hi Minibull,

There is not a special JCW header with the factory JCW kit. It is the standard factory MCS exhaust manifold.

 

any other ideas???

 

what cat are you running?

 

Totally agree.....

 

I agree too.

Dump the Miltek ... if you really want a header, get the one that matches, the JCW headers from the 225HP kit. They will ship those to you. Why mismatch a matched set?

I think maybe the JCW sw saw the aftermarket header and said "no way dude"

 

Exactly.... getting all these parts to "play nice together" is very hard...... JCW has done the work for you my advice is don't "f " it up.... speaking as someone who has lived it.....

 

WHAT JCW cars can only run JCW products ! please. Come on guys - its only a header. If you have noted a power loss something is amiss. You got only a couple of things to look at - 1) how it algins to the head 2) O2 sensor 3) cat - too restrictive?

Go over your install.

 

I say give it time to acclimate. Some poeple have reset their ECU's when installing bigger mods, so that the car will relearn it's peak operating margins.

A good example is a someone in DCMM has a unichip, and has put it in on two seperate occasions, and on both occasions noted it took 2-3 days for the unichip to kick in. Although I'd bet it's not the chip, it's the car learning new tricks.

 

So you guys think the same about BMW M-Power cars? Don't chip the M5 for more power? Don't add that supercharger to the M3? Don't get that straight exhaust for the M6? Shyt, you could say the same about the regular S. MINI designed it for you, so don't "f" it up... SpiderX, MINI put the M45 on your S for a reason, why go and add an M62? It's all relative, and frankly... your responses are of NO help to the poster

That's just silly, I'm with Bahamabart, go over your install... Or maybe you got a faulty header.. Or maybe, the JCW exhaust sucks anyways and it's time to upgrade to a Borla Race or Magnaflow...

 

Sacrilege. Put NON-CRAP parts on a CRAPPY car?

Thats like being a heathen. Wait a second, hmm, I did do that. OK, I'm a heathen too.

Dude ... I was joking about the sw I guess you couldnt see the

 

Hi all,

that so comments so far...

I put on the Milltek as I had seen comments on Mini2 and I thought here also that JCW people had added the Milltek and we happy with the performance and more "performance" oriented exhaust note.

I have the nice exhaust note however after almost 3 days of driving i'm still note as responsive as before the install.

O2 sensor properly plugged in....mmmmm

 

sorry for the bad spelling..my fat fingers hitting too may keys!

 

Did you install a Milltek cat-back too, or are you running the JCW bottleneck?

 

Notwithstanding the other suggestsions of rechecking your install, you could look at some aftermarket software/piggyback ecu to account for the addition of a header....mth, unichip, etc etc...

Hopefully there's no leaks?? Have you reset the ECU?

 

I could not disagree more..... I think my opinion is a data point from someone who has had 5 different headers on his car...... the amount of power gained from header changes is fairly low and in my opinion not worth sacrificing over all performance and driveability.... how much power on a good day do you think the Milltek will net over the JCW..... I will bet at most it is less than the +/- factor of the dyno ....... sacrificing smooth power with no problems for these kinds of gains in my book is not worth it.......

The net gains from the mods that you cite are far more than the header dif in this example..... I am not saying that you should not mod a car far from it but in tuning if you advance or retard the spark and the torque dies by 15 or more lbs....it might be a good idea to go back to where you were and look elsewhere for your gains

 

I think instead of the header you should swap out the resonator for a straight pipe.

 

I didn't mean for it to be taken so literal. More of just proving a point that he obviously isn't looking for "go back to stock" responses. I know you've had a bunch of headers on your car so you are pretty much THE GUY to speak to about this stuff.

hyper, I think you should consider some software and maybe an exhaust other than the JCW. There are better ones out there... I do agree with SpiderX in that the gains are minimal and if you want true gains you're going to need more than just the header..

 

no harm, no foul..... I hope both ways

 

Hi MDSBrain,

I already replaced the resonator with a striaght pipe when I got the car.

 

Hi tsukiji,

I only installed the Milltek header. I am running it with the JCW exhaust with resonator removed.