Hi all,

I have MC JCW 06'. And I want to modify it. It has headers and madness filter.
I want also to change the stock camshaft to RMW camshaft is it a good idea if i change it without change the stock pulley ?
-If i change the pulley to M7 16% or ALTA 15% do i will feel that difference ?

 

15% Pulley & Camshaft.

Plus tune if you'd like.

 

Personaly i would stick with the 15 percent
the extra one percent dosent seem to warrant anything.
Unless the M7 guy wants to convince me otherwise.
Im open to it.
Your likely gonna need a tune after the cam to make it all work.
talk to a Jan from Rmw he will have you thinking about spending all kinds of money.

 

I have read in other site man said that ( I have an 05 JCW and I changed it to a 16% S/C pulley and got ~5-6hp ) thats means the pulley will not gain that much.

 

I have an '06 JCW and the 15% pulley was a significant difference for me. The boost now comes in at a lower rpm and I no longer have to rev before i take off from a dead stop. My boost went from 13.5 to 15.0 lbs. Definitely do the pulley, it will make you smile.

 

What about the temperature ? Is there any more heat ? are you using stock IC ?
Thanks.

 

Yes, I am still using the stock IC. Regardless of intercooler used, the more the intake charge is compressed the higher the temps will be. So, I am sure a 15% pulley has higher temp than the OEM JCW at ~11.5%, which is higher than the stock S at, uh..... 0%.

As far as performance goes, the higher compression given by the 15% outweighs the negative of the higher temp, even with the OEM IC.

Getting a better IC is always good, and will yield some HP/Tq. However a better bang for the buck would be to just replace the pulley.

 

Do you know how many HP did you gain ? did you put the car on DYNO ?

 

I have seen estimates of 4-6hp with just the pulley swap from various posts, I believe some of those did have dyno data. For me I did not dyno before and after, but would readily believe 5 or 6hp. You will get slightly on the higher side given your other engine breathing upgrades. Actually, we have a very similar setup.
Again, the max hp increase was not as important as the boost now kicking-in at a lower rpm. Throttle response is not instantaneous, but it is much improved.
This was a very rewarding DIY project, there are plenty of posts and instructions available from the various vendors. I have the Madness 2 piece pulley, very happy with it.

 

Dude I've been wondering the same thing, in regards to 16% pulley. I think oem JCW is close to 13% not sure??? Maybe someone else knows.

 

What I have read and measured on the JCW pulley I removed was ~11.5%.

 

I talked to ALTA and M7 all of them told me you don't need to change the pulley because you have already small pulley and you will just gain 5-6 HP and Jan said only install the camshaft and tune the ECU

 

You definitely do not 'need' to change the pulley, but this is all about 'want'.

It sounds like you have a plan, and that's great. I am sure an RMW cam coupled with a good tune will have significant value.

 

How much will the cam add to performance versus a tune alone?

 

As Jan told me it will give about ~10 HP without tuning.

 

This sounds like something I would like. How do I find an appropriate mechanic to do the swap?

 

Since this thread is not GP-related, I'm moving it to the 1st Gen MINIs:Modifications:Drivetrain (Cooper S) forum.

 

-11.5%? That is probably why most stock JCW are pulling only 175-180 whp in the dyno.

 

Thanks Edge

 

I have an '05 JCW with the stock (JCW) pulley and the RMW cam. The cam, with a tune by Jan at RMW, made a significant difference. You can see the results on the thread titled: More Kudos For Jan At RMW....
I would like to add the 15% pulley but I need to work out some issues I am having with pinging. Once that is resolved, and Jan OKs it, I will have the 15% pulley installed and another tune. This should get me close to my goal of 200+ ft/lbs of torque!

 

have you installed the RMW cam 1st without the tuning?

 

I am currently running a rmw cam without a tune for it. Really its close to stock while at idle, and runs just fine. I am however getting a tune in a couple weeks. once that is done im sure it will be even better.

 

I had the cam installed in Van Nuys California at MiniCorsa and then drove about 45 minutes to get the tune by Jan of RMW at Church Automotive. The car ran a little "sloppy" due to bad plug wires and/or a bad catalytic converter causing the engine to miss at WOT. After the tune, the car ran very strong. The most noticeable difference in power of any mod I have made.
So, to answer your question, the base line dyno on the post I mentioned (More Kudos for Jan....) is with the cam but no tune. The final dyno run is with both the cam and tune.

 

What is your car WHP?

 

OK, LUYS, since you seem to be unwilling to go to the thread I posted with the numbers, here they are again.
213.2 WHP, 190.3 lbft torque.