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#11 | |
![]() Join Date: May 2017
Location: Grapevine
Posts: 56
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#12 |
Join Date: Jul 2016
Location: Boone County, Indiana
Posts: 14
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There is a video on You Tube(I'll try to re-find) of a ZR1 at Nurburgring and the car definitely has some kind of waste-gate or popoff valve pop when shifted...gotta be some power-adder there.
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#13 |
![]() Join Date: Jun 2005
Location: CenCoast California
Posts: 899
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I spent a lot of time watching/listening to that footage. Couple things I noted...
1) There is littlie doubt in my mind the engine is supercharged because you can hear the blower whine and those two big air intakes at each side of the front fascia are likely bigger charge air coolers. 2) I heard no "pop-off" valve or wast gate but I did here the typical "drop-throttle cackle" one often hears from C6/C7s with bypass exhausts when you lift at high rpm. 3) The car is loud. in fact, it sounds just like my '12 Z06. I uses a stock exhaust system, but with a backdated, 2-cat mid-section off an '11 to replace the stock, 4-cat mid-section which came on a '12. That coupled with the lower-restriction '12/'13 mufflers makes the car louder when the bypasses are open and makes the cackle louder, too. 4) Sounds like the engine in that car has a somewhat higher rev-limit which doesn't surprise me because they may need to turn the engine faster to gain some power. I'm going to bet that "LT4+" has stuff like an upgraded rotating assembly, Cadillac racing valve lifters, upgraded valve train and etc. Let me know what you think.
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Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 Last edited by Hib Halverson; 06-03-2017 at 10:42 AM. |
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#14 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Hib,
There's been photographic evidence of the C7 ZR prototypes wearing ZR1 Supercharged badges on the fender, I believe the center cap also says the same on the new "zr1 star wheels". The wheels themselves have zr1 as part of the casting.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX Last edited by XfireZ51; 06-05-2017 at 11:18 AM. |
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#15 | |
![]() Join Date: Jul 2010
Location: Woodstock, Ontario, Canada
Posts: 1,275
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The R1740 TVS 1.7L supercharger of the LT4 spins at up to 20,150 rpm – 5,000 rpm more than the supercharger on the previous 2.3 liter LS9 engine. With 9.4 vs. 9.7psi of boost pressure LT4 vs. LS9. LS9 was redlined at 6600rpm, GEN 5 LT4 is the same at 6600rpm for fuel shutoff. We'll probably see forged aluminum pistons, like the GEN IV Ls9 and GEN V LT4, the only other modern GM V8 engines to use such pistons. Itll be interesting to see whats inside the new GEN V SBC engine.
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peace Paul ZR-1 Net Registry Member #1494 |
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#16 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Paul,
If in fact the C7 ZR is using an LT4 w a larger blower, it will be interesting to see what differentiates this car from a Z06 sufficiently to warrant the premium No doubt Chevy will be asking. Chevy never published the Ring times of the Z06. Disappointing? Now maybe a balls out track version?
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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