Hi All,

Has anyone asked M-Engineering to update the programming to include the Porsche Sports Exhaust (PSE) valve control? To fully open the oem valves?
If so have you seen any sound or power difference(decrease in power) - perception or otherwise? I’m asking because I am getting mixed reviews on that specific function and have some past experience that leads me to believe this may not be the best thing to do.

**please note that this comment has absolutely nothing to do with the core function of the M-Engineering tune!!! I’ve never seen such positive feedback about a vendor on this forum as M-Engineering, so much so, that I’ve purchased it and installing tomorrow.

My question is specific to opening the valves and if that is really something that effects the sound and/or power. I can’t say anything about the sound because I haven’t tested a 992 car with or without the option yet. I can talk about the power (regarding a different car) because my previous car was an AMG E63s with the RENNtech exhaust mod (forcing the valved exhaust to 100% open all the time). It was a keyfob process. I did feel a substantial increase in power when I removed this mod when I took my last drive to trade in for the 992. Hrs to tell on a car over 700hp . So I’m wondering if keeping the valves open throughout the entire RPM range in terms of back pressure on a turbo car to some extent hurts power. Does the sound profile really change much?

Any feedback from those who have used a tune to open the oem PSE valves? Thanks so much!!

 

I was wondering the same thing too...

Sport+ is presumably programmed for optimal performance and does not keep the valves open.

 

Sport + removes the pops from the exhaust which do have an effect on performance per Porsche. I have seen nothing from Porsche that says the valve operation is suspended in sport +.

 

I have recieved several files from M , the latest just over the weekend. So far as I can tell none of the files have been able to open the valves fully on demand. I have a SOUL valved exhaust and can see the valves by looking into the pipe with a flashlight. I have yet to hear anything different from stock in the sound and looking into the pipe at idle the valves do not open any further than stock.

 

In the TT/S, Sport is louder and has pops, which is worse for performance and heat management. However, valve modulation still occurs in Sport +, which suggests that 100% open valves though all the RPMs may not be best for performance.

 

As far as I know it's all speculation. I think it's just as likely that the variable valve operation is done to meet noise requirements, particularly at idle.

 

This idea that this variable valve system exists "for performance" is wishful thinking at best.

Sorry, but these valves aren't making your car faster.

 

Im no fan of the PSE, been waiting for my JCR valved centre (now almost year). And only going with valved for the neighbors, my spouse and conference calls.

As per the great tuner Gintani, large bore straight-piped systems do not give you the best performance. There is an optimal pressure for any exhaust system to flow at its best.

It just may be that PSE in Sport+ considers dB requirements for track and performance too.

 

I recently did the valve mod on my M-eng tune, C2S. I have PSE and catless downpipes. I didn't notice any increase in sound at all. I asked M-eng about this but they said I could switch back to oem valves and compare, but I haven't had the time to do it yet. But its definitely not any louder for me.

If it really is working for me or not, power-wise I did not feel any difference (valves don't make it faster but I wanted to make sure it wasn't slower). M-eng did assure me that there wouldn't be any power loss from the valve mod.

 

It maybe that the 992 valve control is part of a BCM that receives a signal from the DME but isn't controlled from the DME(ECU) directly. I would defer to M-Engineering.
Getting rid of the valves, as is the case with our Performance Exhaust System doesn't hurt power.
Noticeable gains would come from Sport Cats and a Tune.

All of that being said, we are in development of a stand alone solution. I don't have pricing or eta, and I can't tell ya that much about it yet as we are still evaluating everything.

(working on a better video, thanks for the heads up it wasn't working for everyone).

Dave @ SOUL

 

Do you just have the exhaust or exhaust and sport cats?

 

start a wait list for the stand-alone solution I'm interested !

 

What do you mean by "Stand alone solution"?

 

Key fob / home link actuated valve controller. I have a teaser video, I'm working on posting it up.

Dave

 

i dont understand how there can be NO difference in sound with valves fully open?