PSE rattle and valve delete, valve mapping - Porsche 718 Forum
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post #1 of 34 Old 07-20-2018, 01:35 AM Thread Starter
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PSE rattle and valve delete, valve mapping

As we know the exhaust valve have a tendency to rattle when it opens at 2000rpm.
On some other Porsche models the valve have its own mapping, open/closing depending on gear and rpm.
On the 718 it looks like there only is the 2000 - 50km/h limit.


My valve starts to rattle from time to time and its not the up and down motion that causes it, there is a play sideways.
On older Porsche you simply disconnect the power to the vacuum solenoid (where it is located on a 718 I have no idea) or disconnect the vacuum line, I might just do that........


Any thoughts or ideas?

For the fun of it.....
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post #2 of 34 Old 07-20-2018, 10:01 AM Thread Starter
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a quick test with some wire to keep the PSE open worked good.
One would also be able to put something to prevent the play to get rid of the rattle.

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post #3 of 34 Old 07-20-2018, 11:03 AM
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Ah...so the infamous R32 Flapper Mod is back in a new car!
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post #4 of 34 Old 07-20-2018, 11:49 AM Thread Starter
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LoL

The thing is that if you compare the valve on the 718 against other Porsche models you will see that the valve aint in a good quality valve
There is nearly 1cm of play sideways but some DIY would prevent it from rattling .
It would not suprise me if that valve is gonna be a big issue later on for us.........

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post #5 of 34 Old 07-20-2018, 02:53 PM
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Id be curious if there is a fix for the rattle. I can make it rattle on demand at 2000 RPMs with sport exhaust active.
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post #6 of 34 Old 07-21-2018, 12:13 AM Thread Starter
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Quote:
Originally Posted by Guaji View Post
Id be curious if there is a fix for the rattle. I can make it rattle on demand at 2000 RPMs with sport exhaust active.
I am gonna try to take some pics on what causes the problem
Then mayby we can try to solve it.

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post #7 of 34 Old 07-21-2018, 04:27 AM Thread Starter
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Its not only the play thats making the noise its also the movement it sealf.
Some heat resistant grease might be the solution!

Fully in



And out


In another thread i mentioned that i did the 981 exhaust mod, here is a pic of the smal gap i have now, makes the sound even better
Guaji likes this.

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post #8 of 34 Old 07-21-2018, 05:09 AM Thread Starter
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Grease helped a little bit but not enough, a couple of weeks and it would be as normal i guess
If the axle is fully in/out and the valve engages you get the noise because it moves sideways.
So prevent it from moving in/out or prevent it to reach the end by 1-2mm would solve it
Or keep it fully open at all times.

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post #9 of 34 Old 07-22-2018, 11:10 AM
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I came across this video since I was investigating aftermarket exhausts, which seem to delete the valve. Though the exhaust pictured in this demo is the base. The purist in me wants to keep it stock, however the aftermarket exhaust sounds appeals to my childish side.




Last edited by Guaji; 07-22-2018 at 11:14 AM.
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post #10 of 34 Old 07-23-2018, 02:05 PM
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Quote:
Originally Posted by JakiChan View Post
Ah...so the infamous R32 Flapper Mod is back in a new car!
Hah. It's not just an R32 thang, or a VW AG thang. BMWs with the 2.0 N20/26 four and the N55 inline-six also have a 'flapper' that can be permanently opened by disconnecting a wire while the valve is open. On BMW's, the flapper completely closes off one side of the exhaust after the muffler, so it's a primarily a quieting mod.

Good to know that the wire-pull trick works on our cars, @johan . Good work! One question: Did you have to pull it while the valve was open (i.e., car running & mode on)?

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