Exhaust sound when shifting

Hi folks,

When you hear a Carrera GT row through the gears the sound immediately after clutch release at WOT (1:24), or not (1:36), is reminiscent of inline four sports bikes when you use the clutch to upshift and some relatively older race cars with clutched up shifts.

In the Carrera GT, you usually don't hear the upshift sound characteristic out of the exhaust that I'm referring to when shifting higher gears like 4th to 5th for example.

Can anyone, who knows exactly why that is, explain please? No half-knowledge takes please. I already know the V10 was meant for a race car and the clutch was 2/3 the size of a 911 turbo to achieve lower engine mounting and is made from silicone carbide, has four friction discs and doesn't have a two-mass flywheel.

 So please explain exactly why the CGT's up shifts sound the way they do (1:24 in the video link above), and exactly why clutched up shifts of sports bikes today sound the same. Thanks!

Who gets to "usually" hear Carrera GT shifts?

SeqtV12 said:

In reply to AngryCorvair (Forum Supporter) :

How do you effectively request in the original post to not chime in with useless replies? Hey think of all the readers later on having to sift through junk to get to the real answer.

You don't.

2 time poster giving AC crap. Haha.

Well, this is quite the stealth canoe.

It's the dingle hopper. It's getting stuck in the flarmister and the shift is so impressive that the dingle hopper pops out. 

It doesn't do it on the 4-5 shift because everyone knows the CGT doesn't use the dingle hopper then, it uses the pringle flanger and those are virtually silent. 

Obviously they were granny shifting, not double clutching like you should.

SeqtV12 said:

In reply to AngryCorvair (Forum Supporter) :

How do you effectively request in the original post to not chime in with useless replies? Hey think of all the readers later on having to sift through junk to get to the real answer.

LostInTransit, is that you??

No one knows exactly why anything is.  You'll have to settle for half-formed guesses.

Sorry.

I just listened to a Soul Performance Products equipped Cayman rip through the gears. Does that count?

I mean, it's no v10, but a flat 6 sounds amazing. Please don't comment, you know, unless you want to make fun of me or pretty much anything else.

I mean it man!!!

Russian Warship, Go Berkeley Yourself said:

SeqtV12 said:

In reply to AngryCorvair (Forum Supporter) :

How do you effectively request in the original post to not chime in with useless replies? Hey think of all the readers later on having to sift through junk to get to the real answer.

LostInTransit, is that you??

You could be right. My first thought was _. 

In reply to Stampie :

Oh, he's Definitely Gone Now  

Toyman! said:

It's the dingle hopper. It's getting stuck in the flarmister and the shift is so impressive that the dingle hopper pops out. 

It doesn't do it on the 4-5 shift because everyone knows the CGT doesn't use the dingle hopper then, it uses the pringle flanger and those are virtually silent. 

 

 

Seems that you forgot the crucial addition of the thingy-majingy.  That really adds depth to what the dingle hopper is capable of doing, even with the pringle flanger.  

I always get a kick out of someone posting a question, confused, vague, or otherwise, doesn't get an immediate free and accurate answer to his liking, and then posts demand that he be paid attention to and taken seriously. Okay.

kb58 said:

I always get a kick out of someone posting a question, confused, vague, or otherwise, doesn't get an immediate free and accurate answer to his liking, and then posts demand that he be paid attention to and taken seriously. Okay.

The dingle arm is well known for preventing sinusoidal depleneration. Normally you can't hear this but the CGT's small single-mass flywheel allows for aligning the tremie pipe with the marzelvanes and voila.

The noise is clearly a timing issue.........by the driver.

You guys are all wrong.  It's obviously the bespoke muffler bearings.

paddygarcia said:

The dingle arm is well known for preventing sinusoidal depleneration. Normally you can't hear this but the CGT's small single-mass flywheel allows for aligning the tremie pipe with the marzelvanes and voila.

Coupe GTs had massively heavy flywheels, though.  That and the super low compression engines made them take forever to decelerate off throttle.

I heart this thread.

"Respect my authoritah"

parker said:

You guys are all wrong.  It's obviously the bespoke muffler bearings.

I'm so ashamed of myself right now..........it's so obvious.

I do have a question though; which muffler bearing specifically?

The perpetual inner bearing or the outer double cyclical bearing?

Tom1200 said:

parker said:

You guys are all wrong.  It's obviously the bespoke muffler bearings.

I'm so ashamed of myself right now..........it's so obvious.

I do have a question though; which muffler bearing specifically?

The perpetual inner bearing or the outer double cyclical bearing?

It's the interaction between the inner and outer.

Tom1200 said:

parker said:

You guys are all wrong.  It's obviously the bespoke muffler bearings.

I'm so ashamed of myself right now..........it's so obvious.

I do have a question though; which muffler bearing specifically?

The perpetual inner bearing or the outer double cyclical bearing?

Only two bank engines like motorcycle V4s have the double cyclical bearing, for to handle the variable exhaust pulses coming from two different sets of cylinders happening at the same time.  (This is why Subarus sound the way they do, too, because of the exhaust crossover geometry preventing the use of such a device)

Rotaries have the perpetual inner bearing, for the lack of reciprocating motion.