ZR1 Third week at Nürburgring
10-28-2023, 05:35 PM
#1
Drifting
Thread Starter
ZR1 Third week at Nürburgring
The following 5 users liked this post by imxz28:
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10-29-2023, 08:50 AM
#2
Race Director
That does not sound like my car. Unless the turbos and exhaust pointing at the ground change the tone at 2.5k to 3k rpm that is not the 5.5 fpc. It sounds deeper. Not muffled to me.
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LE MANSZ (10-29-2023)
10-29-2023, 09:37 AM
#3
Sounding a little more like America!
10-29-2023, 10:21 AM
#5
That thing must sound wild unrestricted. I wonder if it will be louder than the C7 ZR1?
10-29-2023, 10:52 AM
#7
Melting Slicks
That exhaust configuration looks remarkedly similar to the one in this thread:
A Twin Turbo C8Z is born
A Twin Turbo C8Z is born
10-29-2023, 11:26 AM
#8
Drifting
It could well be new CPC? Why not?
The question may be that the LT6 may have reached its reliability limit at 670hp?? After all, the LT6 has reached a mild stone that other manufacturers could? How much more stress can it actually support in FI form? No one knows except for GM Engineers. Perhaps one day when folks has more time and $$$$ to tinker with the LT6s.
At the end of the day the ZR1 should run a 1/4 in the low 10's or high 9's and quicker then the Z06 on track. Who cares if it doesn't have a FPC?
The question may be that the LT6 may have reached its reliability limit at 670hp?? After all, the LT6 has reached a mild stone that other manufacturers could? How much more stress can it actually support in FI form? No one knows except for GM Engineers. Perhaps one day when folks has more time and $$$$ to tinker with the LT6s.
At the end of the day the ZR1 should run a 1/4 in the low 10's or high 9's and quicker then the Z06 on track. Who cares if it doesn't have a FPC?
Last edited by CDNZR; 10-29-2023 at 06:40 PM.
10-29-2023, 11:39 AM
#9
The 'reliability limit' on the LT6 is primarily down to the revs. I wouldn't worry too much about a version with beefed up internals built for boost and most likely capable of 1200-1500 less rpm.
10-29-2023, 04:27 PM
#10
LT3 with boost?
10-29-2023, 10:03 PM
#12
10-30-2023, 06:20 PM
#13
Le Mans Master
The flat plane crankshaft is significantly stronger (nd lighter) than any CPC can hope to be.
The strength of a FPC engine is block vibration limited not piston/rod/crankshaft/power limited. {{That is the engine breaks when the vibrations disassemble the block--not when the combustion pressures bend something.}}
The strength of a FPC engine is block vibration limited not piston/rod/crankshaft/power limited. {{That is the engine breaks when the vibrations disassemble the block--not when the combustion pressures bend something.}}
10-30-2023, 08:08 PM
#14
Le Mans Master
Yes!
And yes!
In Tour mode it is very quiet, in Racing mode it is very loud. Love that burble sound coming off the throttle.
In Tour mode it is very quiet, in Racing mode it is very loud. Love that burble sound coming off the throttle.
10-30-2023, 09:33 PM
#15
Drifting
yup.An rpm drop from 8600 down to 7000 drops the 2nd order vibration by almost 35%. The increased bearing/rod stress from the required LT7 boost is less than the reduction in the 2nd order vibration, and in a different direction. Developing the LT6 was likely more challenging from an rpm/stress standpoint, while the LT7 is going to have some different transmission and heat rejection challenges.
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10-31-2023, 10:07 AM
#16
That sounds really different... almost like the two cars are indeed testing different engine configs like the crazy guy on Facebook has been saying.
10-31-2023, 11:04 PM
#17
Le Mans Master
I hear some hiss in the exhaust when under full throttle. I hope this is just a requirement for the Nurburgring noise limits, and is not present on the production car.
