Is it necessary to install diverter valves when you have the stage 1 APR ECU flash on a 17 911 Carrera PDK with Sport Chrono The 911 has 38,700 miles and the flash was completed 1000 miles ago. The reason I ask is I’m considering purchasing this car. Also will this be an issue with the Porsche CPO, it has the CPO good until Feb 23, 2024
thanks
Rennman
NJ

 

Not necessary, no. The worst that will happen is the diverter valve fails and you lose boost. Then you can have them replaced.

On the CPO - yes, it will affect any manufacturer warranty as well as most aftermarket warranties. Theoretically the Magnusson-Moss act applies insofar as they are supposed to prove that the modification(s) caused the failure, but practically speaking it is very easy for dealers to claim this and deny warranty, the onus then falls upon you to refute that claim. It really isn't as easy as others claim, and will undoubtedly require a lawyer in 99% of those cases. In other words - if you have an engine-related failure, be prepared to pay out-of-pocket.

 

thanks I’m not going to track this car it’s a pleasure car and partial daily driver for me. I sold my 89 3.2 back in 20 and wanted to upgrade. Would you put the car back to stock or just leave it the way it’s set up I could also go to ARR for $1500 and purchase their power train warranty
what are your thoughts
thanks again

 

these cars are already comically faster than they have any actual need to be making the APR tune objectively unnecessary. I'm not sure about APR's transferability, but getting it flashed back to stock would be a simple peace of mind. that said, there's a reason APR offers a cheap warranty for their stage 1 tune -- it's a winning bet for them. they make money on it because the failures are just that rare.

 

I just got the APR Stage 1 back in April of this year on my 2017 C2 PDK with 40,000 miles and one year of CPO left. I did use the CPO for a bad water pump last year but doubt they would have covered it after the tune.

If you don’t care about power then don’t bother with it since you still have two years of warranty left and you don’t know what can come up.

I’m assuming you test drove it already? For me personally going to back to stock would be a let down. We are talking about going from 475 Hp/460 TQ back down to 370 Hp/330 TQ.

 

yes I drove the car even in sport it’s amazing.
I’m probably making more of this than I should
if I need warranty work I have a great shop locally that the owner is a young man I’m friends with that said he can bring it back to stock prior to bringing to any dealer, he will do all my service. I’m excited about going back to a Porsche again this will be number 13 for me and I loved them all.

 

Thats a solid plan. The tune really wakes up the car. Also, I am planning on doing the diverter valve soon. Added Akra 200 cel cats and now waiting for the SOUL headers, Tial inlet tubes and BMC filter to get here so I can schedule some shop time. Nice part about the APR tune is that you can add bolt on mods and don’t have to add files or retune unless you upgrade turbos. It’s true what they say about the rabbit hole lol. Enjoy in good health Sir and welcome back!

 

The increased drivability alone is worth a it. FVD tune here on '17 C2 PDK.

 

can you elaborate on what you mean by drivability? if anything my transient throttle response went down with the higher boost targets.

 

Throttle response improved, boost comes on stronger and more linear.

 

Depends on your dealer but some are more "tune friendly" and dont walk away on you if you have a warranty claim unrelated to the tune. Wouldn't hurt to visit your dealer and have a chat with the service manager to see what his temperature is on this.

 

Interesting. Again, I've experienced very much the opposite. Higher boost targets take longer to reach, increasing felt turbo lag, decreasing transient throttle response, all of which serves to decrease "drivability" in my eyes..

 

My FVD 93 octane calibration is FAR improved over stock. No way I could go back to OE calibration.

 

My experience is the opposite of yours and consistent with @XLR82XS .

More linear power, less lag, better throttle response.

 

Sounds like my car is super broken