LZRD GRN

I am due to run at a Porsche Sports Cup (Porsche Corporate) event in Tremblant on Sept 9.
Just reviewing the documents and see the track will impose a 92 db limit!
Have not run Tremblant before, so:
- would a 21 GT 4, with Soul over axle pipes (non resonated) likely pass this??
Thanks for any help or advice!

Cheers!

Muskoka

From some googling, it appears a stock gt4 runs in the mid-high 90's. So yeah, with a Soul pipe, you're in trouble. There's always the option to just short shift a whole bunch.

Dwane

Bone stock GT4’s bust sound all day long(even in the lower run groups)

LZRD GRN

Thanks Dwane!
I assume they short shift in order to run, given how much louder I am than stock (it's a lot louder at full tilt), probably not worth going...
Cheers!

gt3rs.

With sport exhaust button off ?

Turbodan

go to racing and drivers ed section and they are discussing this and how to run there below 92.

Dwane

yup

Dwane

This is our solution(2022)for a 944 Spec2.

Note-I’ve only busted sound twice in the last few years(without 2022 muffler add on)….both times on highly overcast days.

olegd

Under load, Porsche ECU opens up exhaust valves at around 3400rpm no matter what mode the car/exhaust is in.

Inrev

2016 GT4s do bust sound a lot, 2020s in the vast majority don't, at least the manual ones. I run my 718 GT4 with a bunch of other ones and never have had any issue. I heard of someone busting sound coming out of turn 7 in 3rd but that hasn't happened to me yet in 3rd or 4th. I never need to short shift and never got flagged for sound. 6 track days there so far this year, many last year and a few in 2020.

Dwane

Rennsport PCA? Run group?

PierreTT

What Inrev said
I ran my manual 718 Spyder a few times last year without issue.
I was bone stock though, no over axle pipes.

LZRD GRN

Thx Turbodan, will check that out!
CHEERS!

Inrev

PCA in black run group. Other clubs too. Stock exhaust that is.

Dwane

Are you attending the September event…I’ll come over and say HELLO