TB993tt

Well my Cargraphic/RS Tuning 200 cell cats are on together with the dodgy headers....
No nice pictures I'm afraid but I ran some data with my Driftbox.

Pre tuning 100kph-200kph was taking 7.95s (at 500 miles)

After tuning with maybe 25kg extra weight but similar atmospheric conditions the 100-200kph is taking around 7.4s (at 1600 miles)

The car feels much nicer all through the rev band and rips nicely from 5000rpm - it really needs a 7200rpm limiter......

The sound of the cats/headers is the same as stock at idle and cruising but when the turbos are boosting it sounds awesome, quite exotic not like any other Porsche turbo I have heard - I love it

Some of the improvement of over half a second is doubtlessly due to break in but it is definately pokier than stock....

Alcyon

Congrats, cant wait to test my CGs

GT2Driver

Congrats! Sounds interesting. Any idea what the OEM items weigh?

Carrera GT

Sounds impressive. Any chance of posting some YouTube?

MishaDesigns

Congrats

eclou

must post some sound clips Toby!

TB993tt

I weighed the stock stuff this morning, stock headers 3.1kg, cats 3.25kg..... Cg units are 2.5kg and 3.5kg so a net saving of 0.7kg

I will do a sound thingy at some point..... it is really impressive, sounds awesome on boost. I was trying to work out why it sounds how it does since the VTGs do not have wastegates so all the sound is from the turbos...

GT2Driver

TB,
Thanks for OEM weights. Maybe the sound from the turbos are dampened more thru the OEM cats which I assume have far more cells ( any one know how many? ).

GT2Driver

03-turbo911

You changed the headers, cats and got an RS tune? Must sound wicked because the stock one sounded great when revved up.

TB993tt

Khalid, this is just headers and cats, Standard ECU - developed and tested on the RS dyno at 560PS/700NM....
This power is definately here, the clutch is feeling the torque with a little slippage at 4000rpm if I bring the torque in abruptly !!

Ran off a 60 -130 today.... first graph was at 500 miles bog standard ZERO mods 0degC - 8.3s



Graph below is in 560PS guise 10 DegC 1600 miles - 7.8s

Same test track.....

03-turbo911

Surprised that the clutch is suffering a little bit at this stage but excellent info!

TB993tt

So above is the trace for the power run on Manthey Racing's Maha dyno. I don't like or believe most rolling road chassis dynos but Manthey's is one of the better ones with proper cooling to replicate road use, see pic below.


The thing that first srtikes me is how the Maha loads the engine properly giving peak torque right where Porsche say it is 2990rpm, contrast this with the AWE dyno which seems to think that peak torque comes at around 4500+rpm - this is nonsense and a big reason why I can't take tuning measured on this type of machine seriously, if the torque curve is wrong on the AWE -which it is - how can the power curve be right ?



So my exhaust mods give an extra 12PS and a whopping 56NM which is an excellent result IMO but it does look like Cargraphic have joined in the exaggeration game. I did ask them for the RS Tuning dyno diagram showing 560PS and they couldn't/wouldn't produce it - I can see why now !

eclou

Well, since Porsche claims the Gt2 torque is a flat peak from 2200-4500rpms, I would say that the MAHA plot does not resemble the Porsche published curve either.

Mike/A.W.E.

Toby,

You need to research some of our old dyno posts and read how we view and use that tool.

The curve delta is all that matters to us.

It would not matter if we saw only 5 whp or if we saw 1000whp stock. As long as the same settings were used for the baseline and the test, the difference (delta) between the curves is all that matters.

The difference people see from dyno to dyno depends on the load characteristics of the dyno and its measuring method. The data produced by an individual dyno can be compared to another by only speaking in terms of percentage gain vs stock.

If you are trying to overlay curves from dyno to dyno, you are no different then people who brag about dyno curves with no baseline to compare them to.

Please read this excerpt from our web site (note the last paragraph):
http://awe-tuning.com/pages/faq/awefaq_main.cfm?FAQ=22

TB993tt

Gene
Unfortunately they did not have a stock GT2 Maha curve, I believe the exhaust mods I have make the engine overboost as the torque ramps up, hence the high number at 2990rpm, then it drops to nearer stock levels.... If you remember those RS engine dyno curves they do in fact mimic Porsche's diagrams which you highlighted...

I am not a big advocate of the Maha or any chassis dyno (as you know ) I am merely pointing out this loading issue compared to the AWE dyno which we had discussed before...