Hi everyone, I'm new here and new in Cali. Two month ago I bought a 2009 JCW with 30K miles. LOVE IT!! I had a 2005 Sti with 338whp back in PR and I don't miss it at all (well... just the awd).

I installed the IHC FMIC, Alta AP, Alta Hot Tube, Riss Racing DP (*STOCK JCW CATBACK*), drop in Box K&N Filter, NM insert . Im using AP stage 3 on 91oct. I went las to the Dyno (Dynojet ) expecting 215-225whp but I got 197whp .

1.Based on your experiences, can I get 15-25 whp on 91oct with a catback (alta, NM or Borla)? Which catback its the best for a JCW?

2. What should be the Vaccum PSI value on the alta? the Accesport read 12PSI on vacc and 23psi of boost peak, hold in 19.7psi.

3.What do you think about the Graph after 5,250 rpm? Its Normal? The catback should help?

4.What do you think about the A/F ratio? Its fine or to rich at the top end?

Top Speed Dyno Video:









Thanks for watching and thanks for any help thats you people can bring me.

Pd. Soon all chrome must gone!! working to fit the grill back on.

 

What was your baseline? That will reveal a lot. It will give a good indication if the dyno is a little askew in its calibration or if your engine is to blame. What kind of compression do you have in each cylinder? Are the spark plugs abnormally worn?

Don't blame the catback. You get the most gains in the exhaust system from a catless downpipe. The catback is just a cherry on top of the performance. It offers minimal benefit compared to the downpipe. I'm talking like ~5whp or so. Not a lot.

I can only comment on 93 octane.

Power/torque curve look normal. After 5500+rpm the turbo starts to get restrictive and run out of breath.

Can't commend on AFR plot. Haven't looked at too many of these.

 

I was not aware that it was good to go with stage 3 without a catback.

 

I would consider the JCW catback as a good catback.

 

I rocked 200hp/220tq with a stage 3 map when I had my AP. Not really surprised by your results.

 

Thanks for all the tips.
I never went to the dyno when the JCW was stock.
I'll verify the sparks plugs
I need to verify the compression too. How much compression should I get?

 

Thanks

 

But your r56 is a MSC or a JCW???

 

Why not go Dp-back?

 

My guess is carbon build-up

 

What is the difference between catback and Dp-back?

 

I don't think is carbon build-up because the car feels strong, no vibration, good mpg, not check eng light. But after check the sparks and compression I'll keep in mind inspect the valves, thanks.

 

I have an MCS and I was running what you were suppose to run on a stage 3( intake, fmic, and 2.5" catless exhaust for good measure I threw in a catless dp).

 

OP, you should be running the stage 1 FMIC tune with the mods you listed. The JCW catback does not flow enough to run the stage 3 map correctly.

Also it's important to make sure there is plenty of air from a fan to the intercooler and intake. If there isn't much airflow to these, it can cause low power.

Stock readings are very important to use to compare like mentioned before, to gauge how the dyno reads. But it does seem pretty low.

The AFR looks good.

 

Catback is from the catalytic converter back and the dp back is from the down pipe which is in front of the catalytic converter.

 

That make a lot of sence to me. They guys of the dyno put a weak fan in front and after the last pull the car got hot. I'll try the catback and a Nice big fan in front of the car for the next run.
Thanks!

 

What about the vaccum that the AP read? Its -12psi the the actual vacc value? should not be close to -20psi

 

You're new to LA? I say you venture out to MD Automotive in Westminster.

http://markdibella.com/

Most of the top automotive magazines go to him for their dyno readings.

 

Ditch the AP and get a tune from JAN@RMW.. they did a bolt on JCW and it made 250WHP/310WTQ..

Beats that weak soon to be unsupported alta tune you are running that for sure.

Heck I am bolt on MCS with an RMW tune making 225WHP/250WTQ on a smaller turbo and different engine.

Catbacks provide little no real power gains, especially if you have a an aftermarket DP.. I have a catless riss racing DP w/ stock cb when i was tuned.. went to an aftermarket catback, made no more power than stock.

I have argued this idea up and down with Mike@SocalCobb and we came to the same conclusion that catbacks and power gains are minimal at best.

 

^He has a DP. I made 221whp on stg3 Cobb AP. I'm also only a MCS. That's from a flash tune, not even dyno tuned. As far as I can see, RMW doesn't make much more power via a custom dyno tune anyways. ~fail

 

I am adding a k03/04 turbo and water/meth to mine soon and going to have him retune mine. Sounds like I will be getting some good power when I do.

 

You must be joking... ROFL.

If you really think someone is making better or more reliable power than jan, you sir are high.

IIRC, you w/m and a lot more mods than i did haha. Keep your useless AP, canned tunes are garbage.. one tune doesnt fit all cars.

90% of all AP tuned cars have made super low numbers including the JCWs.

Jan has consistently pulled 210-235WHP out of an MCS, and 240-280WTQ out of them. Mods make the difference.

Cheers.

I like the sound of this, I have a k03/k04 hybrid sitting in my closet... just havent installed it. Waiting to do w/m with it like yourself.

 

Wath meth never tuned for the vehicle and when I dyno'd it was with water meth off. From what I've heard about RMW tunes, it's really not worth it. That's from a close friend who swears that RMW is not the way to go.

I'm not going to get into a debate on whose tune is better, OP needs advise and all I'm chiming in on is to say that AP can make just as same power as RMW tune on stage 3.

I have no doubt that 4whp difference between are S will add up to much of a difference. I would gladly take it to the track and prove it to you.

 

What you have heard seems to differ from the reality of it. The highest HP in the US are all tuned by RMW. Whether its a stroker or not. I am sorry the AP cant do what jan can do, its a great tool but canned tunes are garbage.

The debate is the OP will no longer be able to get any support for his AP, and once mini does a firmware update bye-bye AP.

4WHP can come from a lot of things like dyno, mods, weather, etc so lets not make that the deciding factor.

You can stand by your cool piece of plastic and I will stand by someone who has tuned cars and that has had a porsche he tuned on the podium at each race all season long. And has a 420WHP R53 with a track record at Streets of Willow.

Oh well ill leave you to enjoy your second rate tune. Doesnt hurt me none, the more cars with an AP, the less real competitors.

 

Haha, okay. Keep rambling. I'm more than happy with the AP and I don't take away anything that Jan has done, I'm merely saying again, if you didn't get it the last time, that the stg3 is just as good or better than a dyno tuned RMW tune.