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I have a 991 GT3 with a GMG center bypass. I bought the car with it and the previous owner did not have the OEM center anymore.
I lap at tremblant at the end of may and there's a 92db sound limit.
I was wondering if the car could pass the sound as is, or if I needed to fab some turn downs, or if turn downs would even be enough?
Thanks!
Depends on a wide variety of factors, of course.
I did a track day at a sound limited track last year with a GMG bypass; I used a crimped piece of coathanger to force the valves closed even at high RPM.
You could look into this solution by our very own Mech33.
A bit complicated, but it is a solution.
Don't think I could do this as tremblant takes 2 measurements, one is fixed the other is moving around the track.
FWIW, last year I ran my .2RS with fabspeed headers, side bypass, stock center and I was flagged at 96 or 97 db on a cloudy day.
I guess I'll bring turn downs, and if it doesn't do the trick I'll maybe force the valves to the closed position, for the event, then I would look for stock center exhaust.
I'll buy a sound meter to make sure and report before the event
Pierre or any tremblant guys, do you know at what distance they take the measurements?
Don't think I could do this as tremblant takes 2 measurements, one is fixed the other is moving around the track.
FWIW, last year I ran my .2RS with fabspeed headers, side bypass, stock center and I was flagged at 96 or 97 db on a cloudy day.
I guess I'll bring turn downs, and if it doesn't do the trick I'll maybe force the valves to the closed position, for the event, then I would look for stock center exhaust.
I'll buy a sound meter to make sure and report before the event
Pierre or any tremblant guys, do you know at what distance they take the measurements?
I dont know... I usually try to be smooth and slow (not hard for me ) for the first session in the morning and get harder/louder after. I believe they pay more attention the first session of the first day (human nature) but it is pure speculation... Worst when it is cloudy for sure.
These Fabspeed Turndown would fit a 991RS as well John??
I dont know... I usually try to be smooth and slow (not hard for me ) for the first session in the morning and get harder/louder after. I believe they pay more attention the first session of the first day (human nature) but it is pure speculation... Worst when it is cloudy for sure.
These Fabspeed Turndown would fit a 991RS as well John??
From what we have seen yes they will. However, these turn down require either Fabspeed exhaust system or a new tip backing plate like the one included in the picture below (as you can see the factory tips are a bit unremovable haha).
The Turndowns themselves are $295, and with the backing plate would be $495.
I have a 991 GT3 with a GMG center bypass. I bought the car with it and the previous owner did not have the OEM center anymore.
I lap at tremblant at the end of may and there's a 92db sound limit.
I was wondering if the car could pass the sound as is, or if I needed to fab some turn downs, or if turn downs would even be enough?
Thanks!
I was at Tremblant in my ZR1 with Long tubes and no cats there last year.
My car is very, very loud (in a good way), but has the butterfly valves above 3000 rpm, which I removed the vacuum lines and just slightly lifted on the front straight where I heard the sound check was---no problem all weekend!!
There was a race prepped 430 Scud , but had those curved tail pipes pointing to the LEFT of the car and he was fine...not nearly as loud as my Vette so he had no issues.
You will LOVE this track...one of my new favorites...lots of off camber, blind up/downhill turns and beautiful views of the surrounding mountains and ski area.
lots of great places to eat in the pedestrian village. Hiking, mountain biking, sailing, motor boating, fishing etc... all at the ski area
Hopefully, the owner or his son will be there that weekend so you can see his ridiculous collection of Ferrari's
I was at Tremblant in my ZR1 with Long tubes and no cats there last year.
My car is very, very loud (in a good way), but has the butterfly valves above 3000 rpm, which I removed the vacuum lines and just slightly lifted on the front straight where I heard the sound check was---no problem all weekend!!
There was a race prepped 430 Scud , but had those curved tail pipes pointing to the LEFT of the car and he was fine...not nearly as loud as my Vette so he had no issues.
You will LOVE this track...one of my new favorites...lots of off camber, blind up/downhill turns and beautiful views of the surrounding mountains and ski area.
lots of great places to eat in the pedestrian village. Hiking, mountain biking, sailing, motor boating, fishing etc... all at the ski area
Hopefully, the owner or his son will be there that weekend so you can see his ridiculous collection of Ferrari's