USB/BT Dongle, what software?

 

Potentially, but i havent used them personally. HP tuners is one that I use.

 

HP tuners works on Porsches? I used to use it in my Z06.

 

works well on the 991.1

 

@xBoost @JCviggen x boost I see you’re running a 991.1. JC, did you do Dyno testing on a 991.1 or 991.2 gt3?

I really appreciate how you guys posted your dyno process and your results. It’s a bit concerning as I have Dundon street headers with OEM center box going on my 991.2 GT3, tomorrow!

I also ordered the Dundon Cobb pro tune. I did a baseline dyno last week and plan to dyno my GT3 with just the headers installed next week, and then dyno the GT3 with both headers and their protune a week later.

Jcviggen, did I understand correctly that your low and high end torque improved with Dundon headers only? But was your mid range torque less even after applying and modifying a tune after the headers were installed?

I can accept it if Dundon headers +/- tune doesn’t provide quite as much of a power increase as expected, but I can’t accept no power increase or next to no power increase after spending all that money!

 

Mine's a 991.2 MT

It depends a bit on use case - if you do plenty of road driving the torque bump at lower revs can be nice with the Dundons. Mine being mostly a track car I was looking for outright performance benefits in that setting, and there weren't any.
And because mine's a manual, I probably spend a bit more time in the "bad" RPM range on track than a PDK would.
They're also heavy, and weight is the enemy. Well, they're still lighter than a fully stock system of course but quite a bit heavier than a stock system with side deletes.
Sound wise, nice improvement outside the car but not really a difference inside the car where intake sound dominates (windows up) and they added quite a bit more drone than just side deletes.

I tested my car without a tune and with a tune, and the difference from the headers remained the same between the 2 only the tuned power graph was higher everywhere than the stock power graph. I ran them real world flat out on the long straight at the Nurburgring, 2 days apart, 30 seconds of full throttle up to 180 MPH indicated and I reached exactly the same Vmax stock header vs Dundon.

But there are scenarios where they give a benefit on the street, and the car does sound a lot more aggressive exhaust note wise.

 

Looking forward to see your results! Super interesting to have more data points...

 

I had an idea while reading the german forum... There was a replacement action of Porsche for this part of the (touring) airbox:



Because some charges of that thing did contract on underpressure and/or didn't have the aerodynamic it should have. Maybe your airbox sample has the faulty one?
Is it rippled or smooth on the inside?

 

What also makes me think... the torque dip with the touring airbox comes at the point where the intake flap opens, or not? Its relatively pronounced at 6500rpm but the gap to the original box doesn't grow with higher rpm. Suspicious... could also be a sensor/calibration thing or some resonance that doesn't work how it should with the touring box.