That should not be a problem either. There are plenty of cars running around with 15% and no 380's. Yes a tune would help, but your not in any danger. Plus your running JCW software from your sig.
If you have a dyno in the area get someone's remote tune.

 

Thanks for the info. Now , I was thinking about a JCW rear wing , but maybe I should increase the sc drive and boost instead
Glueing or wrenching ,,, ummm?

 

Get yourself a good header and exhaust to let that baby breathe.

 

Certainly a header will help with breathing and provide some performance. However, the JCW exhaust is really not that restrictive.

While there are plenty cat back systems that will arguably sound better than a JCW system, I am not so sure they will provide a significant improvement in breathing or therefore performance.

 

Getting a 15% but now I'll need the JCW pulley remover

 

Thats a good idea but..... a couple of hundred $$$ versus a couple thou?(only guessing on the cost of the new improved s. charger)

 

There is no such item (that I know of)

 

well the one that can be used on the 11% JCW (MiniMadness?)

 

I bought my 15% redux pulley from Madness and they hooked me up with a puller for the JCW pulley.

 

Well that is interesting news then!

 

I am thinking of putting a 15% pulley on my wife's '04 with about 60k miles on it, does this increase the wear on the motor and do i need to worry about something breaking faster than normal. She just uses it as a daily driver and will never see the track or autoX course. We also have a ALTA CAI, and are getting a cat back exhaust in the next few weeks. Thanks for the input in advance.

 

I pm'd Jan at RMW and asked him if he thought it was worth going from the JCW pulley to a 15% pulley and this was his advise:

"I wouldn't swap the pulley unless you want to run methanol on the track".

So I gather for street driving, it's really not worth the difference. Get a cam instead!

 

Well for my JCW car, I have the 15% pulley and the RMW cam. For the street, the 15% was more important as it moved the power down the rpm range. For the track, the cam really helps as it has great value above ~4.5k rpm, and that's where you play on the track.

 

I never have had a problem with low end torque on the JCW. Definitely feel it on the stock MCS, but it's never been a problem for me. I guess for me, it's simply not worth the expense and trouble of installing the 15% pulley for a small gain...

 

BTW I did order the 17% Jonspeed Stamped Steel Pulley (OEM like) $102 shipped.

 

Got the 15% pulley install. In a nutshell; the car runs through the lower gears more easily, you can short shift it and the flat spot in power is gone . The high RPM stuff is definitely more fun. I think the difference in the heat soak/timing pull etc is more pronounced though, even with the mighty GP IC.

 

Had my car in to check how its doing and get a base dyno run to see if its healthy and to check to see if I needed a new charger (if I needed a new charger i was going to get a 15% pulley at the same time ). Well its boosting well and with just a GP IC it was making 221.6bhp so Im dont think its going to be worth getting the pulley but will instead increase the power through other parts - starting with a new manifold :D

Basically I dont think the small gain over the JCW pulley will be worth the expense...

 

Maybe I should have been more clear, I changed the JCW pulley to a 15%er and I believe it was a good mod for the money. . I can't do anything more than big money hot rod stuff or a custom tune somewhere way out of the area so I'm really at the point of diminishing returns . Installed the M7 Extreme scoop a couple of days ago to help with heat.

 

Upgrading to a 15% over my OEM 11.45% JCW pulley was well worth it to me/my car. The improvement was significant.

As far as a new manifold is concerned, if you are talking:
1. Intake, then don't bother as on a forced inducion engine porting/polishing the intake manifold, or improving it's flow will have an insignificant effect on performance. You certainly will not be able to feel anything.

2. Exhaust header, well you will definitely pick up a few HP on the top end with a lower back pressure exhaust header.

 

Yesterday I have installed the 15% over my JCW pulley. I feel better acceleration in the low-mid. The boost was 13.5 PSI and now 15 PSI. It is good upgrade for daily use car. About HP gain 5-7 I will see on the dyno. I have already RMW cam and meth with JCW pkg.

 

If you dyno the car again, ley us know your new numbers please.

Thanks

 

[quote=Luys;2898662]Yesterday I have installed the 15% over my JCW pulley. I feel better acceleration in the low-mid. The boost was 13.5 PSI and now 15 PSI. It is good upgrade for daily use car. About HP gain 5-7 I will see on the dyno. I have already RMW cam and meth with JCW pkg.[/quote
Yes, dyno please
OK where is this?

 

Sorry was talking about the exhaust manifold (header) and have now done this mod - was very disappointed with the gains though: 1bhp and 5lbft....

However since then Ive made a few more changes... Ive now got a a newman camshaft and custom tune done and am running 238bhp (not sure on the whp think it was just over the 200whp mark).

I was assuming that I would have got around 5-9bhp from the header ( ) so was hoping to be over the 240bhp mark... so have decided to change the pulley to get me up closer to where I want to be

Have now bought a new 'charger - so I can keep my jcw charger with jcw pulley in tact - and intend to go for a 16% pulley. I have the GP intercooler so temps shouldnt be too much of a problem so when the new charger and pulley gets done I will report back

Any guesses on gains?? Im hoping for in the region of 5-12bhp and 5-12lbft - my JCW charger is boosting to 1bar currently so isnt doing bad for 67k miles !!

 

Going from the JCW pulley to a 16% will get you in the 5-7hp range, not a huge increase, but it is significant. It is especially important that the performance boost is lower in the rpm range, so you can really feel it.

You will like it, I promise.

 

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