I just posted up my dyno results of my stock 2006 MCS before and after installation of the JCW Exhaust with the MyMini Resonator Eliminator and the JCW intake. I have graphs of each step of the process and also graphed a comparison of the JCE intake flap open and closed. VERY interesting to see the torque difference when the flap is kept open:

http://www.motoringfun.com/2007/01/2...no-day-part-1/

 

cool info. you must be enjoying ur new mods!

 

bravo

 

Nice job.Your numbers would be higher without all those back to back runs. Do another baseline when the car is cold. Replace that JCW filter.

 

Very nice write up and great detail on the post.
I will be doing the JCW intake and exhaust on my first service in about 5 or 6 weeks. This is great info to have in advance.

 

I'm inclined to say the same (replace it with a foam fliter) but Dr Obnxs detirmined that the stock paper filter might actually flow better than e.g. the MiniMadness? version...

 

I totally eliminated the JCW airbox flap and got rid of that JCW paper filter. I replaced the filter with a universal K&N #RU3130. It fit my box perfectly - without any modifications.

 

great write-up btw!

 

Nice write up!

 

A bit confusing.

Driveline loss is usually 15%, I believe, not 11%. You have the 15% pulley so that accounts for the 163 whp to begin with.

You LOST HP adding the catback? Strange
You gained 5whp from the CAI, also strange and not consistent with the UM CAI intake tests where most, I think, got about 3 - 4HP. Maybe JCW IS better

Best of luck!

 

he doesn't yet have the 15% pulley, driveline loss is usually posted as being around 12%?

 

Your read. I read "planned" upgrades

Then he got a strong engine to start with But, it doesnt explain losing HP with a JCW exhaust. Strange.

 

It may have something to do with the strange crushed section added in 2005 to make it compatible with the convertible's extra frame brace. The JCW starts at the same 2.25" as the standard exhaust, smoothly splits into two 2" pipes, is 2" perforated straight pipe inside the muffler cans (I've cut a hole in the top and looked inside mine) and smoothly drops to two 1.75" tail pipes after the mufflers. So I can think of no other reason why a 2005 JCW exhaust would have more backpressure than a standard 2003 two-ball with its crazy 180° and 90° turns and 2.25 to 2.5 to two 1.75" pipes.

 

BFG9000
I really can't tell from the pictures but the crushed area would only apply to factory fit JCW exhaust. The JCW exhaust that is fit at the dealers when doing a JCW upgrade does not have that crush zone and the front pipe with resonator is a seperate piece.
Steve

 

One thing that was not posted was engine Temp and Air intake temps during the runs. This could have allot to do with the numbers. i installed JCW exhuast on Both my mini's and I can say the car has always felt faster and had more pull up top than with a stock exhuast.

 

Thanks for the comments gang.

No I do not have the 15% pulley yet (getting it installed later this week).

And yes - I do have the crushed section in the JCW exhaust. I may get that cut out by a local muffler shop to remove that, but I don't think that is the reason for the numbers...

Keep in mind - the change between stock and JCW exhaust was VERY small. Temps could definately have played a factor, of course. Temps are listed at the bottom of each dyno graph and there was about a 6 degree difference (6 degrees warmer when the run with the JCW exhaust was run).

The point is that just doing an exhaust will not make much difference without also complimenting it with an intake (JCW or other).

vdubdoug - even though the dyno numbers did not show much difference between stock and JCW exhaust, I DEFINATELY felt a difference - was quicker and did pull more, but I attribute that to the massive weight difference between the 2 exhausts.

Also as a side note - the runs took place about 1-1.5 hours apart (not back to back).

As for the drivetrain loss, I have always heard 12% as well. However, after chatting with Will from M7 Tuning in the MotoringFun.com chat room, he says he has found the number to be much closer to 10% (and he has done a lot more testing than me). I decided to figure on a number right in between - 11%. But hey - if you like 12% - I'll take it Just means more hp and torque LOL.

The whole reasoning behind these 2 mods was to prep the car for the pulley install. I wanted to free up the restrictions in air flow before making the supercharger spin faster. I just can't imagine the difference the pulley will make because I am blown away in the difference these 2 items have already made.

Can't wait!

 

I took the same route as yours.
I have the JCW intake installed first, then the JCW exhaust, then the 15% pulley plus new plugs, then JCW software, and coming is the JCW injectors. With every upgraded, I can feel the improvement.
I wish I could have an easy access to the dyno facility multiple time without breaking my bank.
So much fun now, throttle response is awesome. Very smooth at all rpm. Only downside now is the gas mileage, average 24mpg from 28mpg stock. I think it will improve a little bit after the injectors been installed.

 

The crush zone thing must be new. The exhausts were changed in January, 2004 with different hangars. On my June, 2004 build JCW exhaust, there was no crush zone. Strange indeed

The JCW intake results are also interesting because they are higher than the MU CAI testings on VGS or Alta (or very close) Maybe JCW knows what its doing.

 

just looking at the JCW exhaust it's obvious why it doesn't make much power over stock...the piping is small dia. and the mufflers are huge, there are a lot of bends in the system and the dual exhaust style doesn't help performance as compared to single sided exhausts.

on a turbo/SC car, exhaust performance is only gained when the exhaust diameter is increased, the exhaust has the least amount of bends and the straightest, smoothest bends, of course, smaller high flowing mufflers add power vs large baffled ones.

Myself i would never waste the money on a JCW exhaust because it doesn't deliver any of those things.

Throw a cheapy OBX header in there with your stock cat and see that torque number go way up.

 

I agree. While we did use a blower on the IC, I would tend to agree that heatsoak robbed a few ponies. What important wa sto see the Hp/TQ progression that bolts contribute. While perhaps the numbers are a bit off, those that where there saw/heard a car that just pulled stronger w/ each bolt on.

It was a fun and educational day.

 

Which Dealer installed your JCW flash and how much did they charge?

 

PM sent.

 

I see someone is protecting the dealer that did a software upgrade. At least tell us how much.

 

If they are decided to do perform it for you, it will be from 1/2 hr - 1 1/2 hrs of labor cost. That is all depending on your SA.

 

Been driving with the JCW resonator eliminator for a month now - here is my take on it:

http://www.motoringfun.com/2007/02/2...or-eliminator/