mdrums

Wow...awesome thread! Thanks for post this Tony. I do not have aTurbo....just a 2009 C2S but flashes interest me in if they improve over what the factory has done.

Matyoka

So these "flashes" help non forced induction Porsche engines too? Just like many other first time Porsche owners, looking into a couple Tuning companies as we speak.

cayenne_ksa

I have tuner cable and access to 4 cars with different ECU's. I have never used the cable. if you can give me some tips in how to pull such info I'll be glad to send it to you for compression

ZeroH

Good post Toby.... not sure I've ever seen a succint analysis of a cars tune like this before.... everyone always gets hooked on what the performance numbers are without much/any thought given as to what the tune is actually doing to produce the performance.

It should be said that on the 996turbo's the IAT's with stock GT2 i/c's and even stock 420ps i/c's were much better controlled than these flashed 997tt's at 5-10degC lower, indicating how much tougher a job tuners have to produce a good 997 tune, as those VTG's run HOT !!

911/Q45

All the tuners can play with on NA engines is timing and mixture, both of which are pretty well optomized already from the factory. Save your money and don't risk detonation from too much timing advance.

Matyoka

Thanks 911/Q45. I was trying to find out if mdrums could benefit from ECU upgrades but I guess you answered it.

GT

my god those ignition timing logged are completely catastrophic.. Those cars have less power than stock for sure with ignition at 3 and 4 degrees..
However tobby the GT2 intake is completely different than the tt and one can have much more aggressive ignition angle.. mine has around 26-27 at high rpms, however with less boost than your car. Mine goes to 1.6 bar at 4k and stays around 1.45 after..

Kevin

Toby do you have logs for Engine load and injector duty cycle?

The log showing AFR's in the 10's I would suspect knock activity.

Alex (UK)

So I am a guinea pig for the day then! Charming

My car is definitely not as fast as when I first had the CG powerkit fitted at 2500 miles on the clock. Although that could just be me getting use to the power.

I am now on over 18k miles, and the car hasn't been driven much over the last year. It needs to blow out a lot of the cob-webs, and I am sure the stock clutch is nearly gone given the slips when the weather gets cold. I also have to consider my custom suspension that is more set up for going around corners than accelerating in a straight line. For such air-strip runs I could do with less camber, more positive toe (as the wheels toe-out under acceleration) and more caster for high speed stability.

So we shall see how we get on

TB993tt

I didn't tick those actual value options, I'm not sure how much it slows the data capture down by ticking too many boxes and the ones I ticked give a pretty good picture.
RS said they wanted to see the PWM reading foy my car which apparently tells them something about what the VTGs are doing ? Any ideas where to find this as I couldn't see it on the Durametric ?

Kevin

Toby, email me and I'll send you some info. For my customers I usually tick 12 log values. Usually you will have to run a 12v adapter to supply more juice for your laptop.

TB993tt

Thanks for the offer Kev. TBH the data I ticked is enough for a good snapshot IMO, boost would be interesting also.... I have one of those 12V-24V convertors but can't be bothered with it !

This PWM is what RS have asked to see to fully confirm that my engine is running maximum power - I am recording 0-300kphs in ~30s at Bruntingthorpe whereas I was repeatedly doing 27s or less at RAF Woodbrige so I thought something was amiss but now am pretty sure it is just the surface of Brunters. I am hopefully taking a trip to Germany later in the summer so will get RS to stick the PIWI on the car and check it properly....

ZeroH

Alex the back section of the airfield has a track section to get back to the start so don't worry, plenty of corners for you to push your chassis on !!

ZeroH

Kevin, quick question if I may, Toby didn't post my logs from the event, but would you think that 13.1/13.2/13.3 max is too high afr figures ?... this is what my X50+flash+milltek+headers is doing above 6500rpm to the redline in 4th and 5th... below that its 11.5- mid 12s typically.

I'm thinking it may be time to add a 5bar fpr?

TT Surgeon

Toby, it would be very interesting to see a graph on a stock 997tt with just an exhaust.