My car is 40000km, (25000miles) and spent >20000km with the upgraded VTGs, that can explain too...
I ran 1.35Bar with pumpgas with the Alphas and 1.4/45 with the VTGs until 5000, and 1.25/30 to redline.
I never did over revs truly but often went to 7500 between gears, I mean I let the pedal at 7000 but the logs show about 7200 to 7500 while shifting when run hard.
(never over rev when downshifting)

The real engine stress begins in 5th and overall in 6th of course...
I don't race often but the VBox and the Durametric are always in the car and I love logging...

 

Thxs Nikkos, I will tell you, we are checking what is needed now...

 

To clarify what some could think:

I'm still totally confident with Protomotive wich is NOT guilty of anything, I was playing with the fire and knew it!
Here in Europe and especially in Germany tuners NEVER tune a 993/996/997TT above 800Nm/650crank Hp without swaping the rods for stronger ones, the stock rods are the "fusible" of the Metzger it is well known...
While I didn't work with them because already in business with TK, serious guys like Emre or others would certainly confirm.
We commonly run far faster than in the US here.
I spoke about that many times with my friend Pierre Ofzky, Andy at Sportec, and friends of mine with RStuning and Ruf, etc...
I'm NOT surprised at all.

And while pretty expensive it is a good experience for all of us!

 

Very nice post and very loyal. You deserve a rep point for all this!

Shows a good character.

 

i have been using esmotor 850hp kit for a long time now(more than 20,000km). my car is 997.1 (2007model year) and i use it as DD car, with 3 different boost modes my DD mode is 1.45 bar(650hp on crank). the car has gtx3071 garrets. i had no problems with my car before thanks to emre and esmotor crew. the car is on the list, i think it is one of the fastest tip stock internal car on the list. i don't usually contribute to forum other than reading it, but i is a very nice topic and could be useful to many people on the forum.

 

an almost 4 sec 60-130 on stock internals is impressive!

 

That sounds pretty good! Making power at 3500 AND improving above 5k rpm is definitely an accomplishment.

 

Adding in some of what we've seen over here...the stock internals are very stout up to those power levels. Without any knock, the cylinder pressure rise will be more gradual (but obviously very fast). Once you introduce knock activity, it will essentially act as a jack hammer on the internals. Once this happens, you can imagine how a car that was fine with xxx horsepower will suddenly bend a rod at the same power level.

On power numbers alone, we have seen a 997.1 bend a rod at 30 psi on VTG's, which dyno'd around 750-800 wheel horsepower with a broad torque curve.

 

Thanks for your input.

So what would you say from your experience would be the sweet spot for the 997.1 engine in stock form, in regards to boost levels and power vs torque?

 

We have much more experience with VTG's on that motor, but we will typically limit to around 25 psi on stock internals. 28-30 psi is where you start getting into waiver territory

On our Mustang MD-500 dyno, 700 wheel would be about the comfortable limit assuming that the fuel octane is up to the task.

 

If i am not wrong Pascal is running a boost controller that use injector duty cycle to control WGs,when his injector went 100% duty cycle(over 300km/h)that boost controller went crazy and over boosted it.

 

Not exactly but there is something like that as well in the reasons my rods were stressed:
Yes my HkS uses the injector signal as a rpm sensor, yes my injectors were about 100% DC past 6500 in 6th, I noticed it and mapped a boost warning and a 0.2Bar drop on the HKS once the boost touch 1.4bar in waiting for biggers injectors.
So end 6th boost sometimes get to about 1.4 but without knock activity and relowed after peak.
I believe it is not THE reason but sure it produced stress on the internals...

My engine failure occured under logs end 5th by about 90% IDC, before the risky range of 6500 in 6th.

But you touch here a truth Ali: if you use the EVC6 and use the injector signal as a rpm sensor be SURE your IDC is correct.

 

Hi Ihlan, thxs for input.

Do you run often high speeds? (I mean >280kph)
I'm surprised your engine produces "only" 650 crank HP @1.45Bar with the GTX3071? I thought at least 750?
If I'm right the 850 range is achieved about 1.8; 200hp with 0.35Bar seems to me a lot...
Nothing bad from me here! I'm just asking

P.

 

Pascal,

Thank you for your brave heart.

 

Just honest Mert...