4.2 liter for new GT3RS?
#46
Addict
Rennlist Member
Rennlist Member
#47
Originally Posted by GrantG
I think the side exhausts on the racing version of the Ferrari 365GTB/4 Daytona sounded great (but I guess a straight six sounds pretty good...)
#48
#49
Rennlist Member
Any issues with rear tire or brake temps with side exhaust? I assume no given how many cars have run side exhausts but came to mind looking at the closeup pics (and how close the exhaust outlet is to the leading edge of the rear tire.)
#50
Yes, though remember that with Balance Of Performance any improvement in absolute pace is simply taken away again to keep the racing as close as possible, so that added downforce by itself is of limited use and not worth the trouble. What both the mid engine and downforce do as a consequence, however, is reduce wear on the rear tires. That in turn improves average pace on long runs, and that’s how you win under BOP regulations. It’s a bit of a shame that it works out this way; while the mid-engine layout in undoubtedly more effective it sounds like crap. And I do feel it’s somewhat disingenuous in a “911”.
Also I wonder where they are going with active aero - controllable rear wings and control flaps have been around for a long time e.g. to go from high down force to lower downforce and lower drag.
#51
Rennlist Member
A lot of comments about exhaust note: you can be pretty sure the package will evolve and the sound change significantly as the unveil car adopts race trim.
Outboard exhausts: there are many successful contemporary examples with similar designs... the AMG and Aston GT3 products have had that for years. The exhaust flows into their tire outwash and pretty much gets dispersed immediately to the side. Think of air as a fluid: the forward-facing part of the tires has to push through this fluid at the speed of the car. That fluid must go somewhere; in this case it's "squirted" to either side of the tire contact patch. That's outwash, and carries with it the exhaust gases and their temps...
In any case if tire temps are your concern, it's normally the inboard side of the tire that you care about.
Lastly: the left-to-right merge may help with a certain kind of sound quality but FWIW our Cups on the least restrictive (i.e. Supercup) setup don't merge them either. And they sound darn epic
Outboard exhausts: there are many successful contemporary examples with similar designs... the AMG and Aston GT3 products have had that for years. The exhaust flows into their tire outwash and pretty much gets dispersed immediately to the side. Think of air as a fluid: the forward-facing part of the tires has to push through this fluid at the speed of the car. That fluid must go somewhere; in this case it's "squirted" to either side of the tire contact patch. That's outwash, and carries with it the exhaust gases and their temps...
In any case if tire temps are your concern, it's normally the inboard side of the tire that you care about.
Lastly: the left-to-right merge may help with a certain kind of sound quality but FWIW our Cups on the least restrictive (i.e. Supercup) setup don't merge them either. And they sound darn epic
Last edited by CRex; 07-08-2019 at 09:18 AM.
#52
Drifting
The last thing on a race team's mind is how the exhaust sounds to fanboys. They are in the business of building a race car and winning races, not crafting the exhaust note to appease Rennlist members. I'm talking about the RSR here.
RE: tire temps due to exhaust placement. Who cares. It's a race car. And as said above, you don't really have to worry about it due to the way the gasses flow. They want the tires to be hot anyway. And they use new tires every race and during the race. So it's not like they care if they don't last 5,000 miles. Again... this is for the RSR. The production GT cars will not have side-exit exhausts. I'm willing to bet.
RE: tire temps due to exhaust placement. Who cares. It's a race car. And as said above, you don't really have to worry about it due to the way the gasses flow. They want the tires to be hot anyway. And they use new tires every race and during the race. So it's not like they care if they don't last 5,000 miles. Again... this is for the RSR. The production GT cars will not have side-exit exhausts. I'm willing to bet.
#53
I'll bet you 48 someone in the aftermarket will do it "because race car"
#54
Drifting
#55
Three Wheelin'
[QUOTE=FourT6and2;15958740]The last thing on a race team's mind is how the exhaust sounds to fanboys. They are in the business of building a race car and winning races, not crafting the exhaust note to appease Rennlist members. I'm talking about the RSR here.
Of course if this were entirely true the rear engine 911 would have been scrapped decades ago and to hell with the "fan boys" many of which are also known as customers.
Of course if this were entirely true the rear engine 911 would have been scrapped decades ago and to hell with the "fan boys" many of which are also known as customers.
#56
Racer
Do you think 95% of the 911 buyers actually know what rear vs mid engine means or would be able to extract any more performance out of one platform vs the other. I don't think so.
#57
Drifting
My point is that the sound of the car is purely a result of function. They don't care about wasting time/energy/money to force the car to sound a certain way. They build the car to perform and how it sounds is just how it sounds.
#59
Rennlist Member
^ Be careful what you wish for...I'd rather have slightly less appealing natural sound than internal/external speakers playing a soundtrack...
#60
Three Wheelin'
Do you think 95% of the 911 buyers actually know what rear vs mid engine means or would be able to extract any more performance out of one platform vs the other. I don't think so.[/QUOTE]
‘Maybe not now if your response is typical of current buyers, but that was definitely not the case in past generations of 911 owners.
‘Maybe not now if your response is typical of current buyers, but that was definitely not the case in past generations of 911 owners.