08-28-2017 | #11 |
Join Date: Jul 2005
Location: Jupiter, Fl.
Posts: 815
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Re: More LT5 Rumors
I can't get past the name of the author of these "rumors"....Andrew Hitler?
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"It's about the car, not the people." 1991 ZR-1 White/Black #1236 (Owner since 1994). Stock engine with bolt-ons: Hurst shifter,"Forced Air" intake, Coplon duct, Bee Cool Radiator, Demon coils, Jeal prom, Watson headers, X pipe, 3" B&B's, Rippie flywheel, 4:10 gears, A molds, Toyo Proxes-R888's 12.06@117mph. 1.76 60ft. |
08-28-2017 | #12 |
Join Date: Jul 2005
Location: Jupiter, Fl.
Posts: 815
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Re: More LT5 Rumors
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"It's about the car, not the people." 1991 ZR-1 White/Black #1236 (Owner since 1994). Stock engine with bolt-ons: Hurst shifter,"Forced Air" intake, Coplon duct, Bee Cool Radiator, Demon coils, Jeal prom, Watson headers, X pipe, 3" B&B's, Rippie flywheel, 4:10 gears, A molds, Toyo Proxes-R888's 12.06@117mph. 1.76 60ft. |
08-28-2017 | #13 | |
Join Date: Jul 2010
Location: Woodstock, Ontario, Canada
Posts: 1,275
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Re: More LT5 Rumors
Quote:
The waterpump was specifically ratioed for this high rpm usage. Cam chain durability would come into play shortly after redline IIRC.
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peace Paul ZR-1 Net Registry Member #1494 |
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08-28-2017 | #14 |
Join Date: Jul 2005
Location: Jupiter, Fl.
Posts: 815
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Re: More LT5 Rumors
So, it doesn't have a clutch that releases it at high rpm ?
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"It's about the car, not the people." 1991 ZR-1 White/Black #1236 (Owner since 1994). Stock engine with bolt-ons: Hurst shifter,"Forced Air" intake, Coplon duct, Bee Cool Radiator, Demon coils, Jeal prom, Watson headers, X pipe, 3" B&B's, Rippie flywheel, 4:10 gears, A molds, Toyo Proxes-R888's 12.06@117mph. 1.76 60ft. |
08-29-2017 | #15 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,161
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Re: More LT5 Rumors
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
08-29-2017 | #16 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,700
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Re: More LT5 Rumors
Quote:
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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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08-29-2017 | #17 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,161
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Re: More LT5 Rumors
figures
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
09-02-2017 | #18 | |
Join Date: Jul 2010
Location: Woodstock, Ontario, Canada
Posts: 1,275
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Re: More LT5 Rumors
Quote:
I was hoping one of the ECM calibrators would chime in. I don't have a calibration disassembly in front of me. edit OK I just checked and ys the 1990 calibration at least has the A/C clutch disengaging at a certain TPS %. 1990 A/C Disable TPS Threshold A/C Disable Coolant Temp. Threshold A/C Disable Oil Temp. Threshold A/C Enable Oil Temp Threshold Hysteresis A/C Disable Speed Threshold A/C Disable RPM Threshold 1991 A/C Disable TPS Threshold A/C Disable Coolant Temp. Threshold A/C Disable Oil Temp. Threshold A/C Enable Oil Temp Threshold Hysteresis A/C Disable Speed Threshold A/C Disable RPM Threshold 1992 A/C Disable TPS Threshold A/C Disable Coolant Temp. Threshold A/C Disable Oil Temp. Threshold A/C Enable Oil Temp Threshold Hysteresis A/C Disable Speed Threshold A/C Disable RPM Threshold and the 93-95 calibrations A/C Disable TPS Threshold A/C Disable Coolant Temp. Threshold A/C Disable Oil Temp. Threshold A/C Enable Oil Temp Threshold Hysteresis A/C Disable Speed Threshold A/C Disable RPM Threshold So the a/c is controlled by many constraints, more than just the TPS to which I alluded to earlier. More importantly the actual rpm comes into play, as you could be at WOT while only revving 1500rpm if you wished.
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peace Paul ZR-1 Net Registry Member #1494 |
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09-02-2017 | #19 |
Join Date: Jun 2005
Location: CenCoast California
Posts: 899
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Re: More LT5 Rumors
The 2018 ZR1 will not use a "6.3L LT5" engine.
The '18 ZR1 will be the "swan song" for the higher-performance versions of the C7. The engine will be a supercharged, 2-valve, pushrod 6.2L. As for 36.5-psi boost–I won't discount that, becasue it is possible, but if that's the boost number the engine will either have a pretty low static compression ratio or it will have a pretty damn large charge air cooling system. As for 909-hp at 8000 and 600-lb/ft torque at 7950, if those are really the numbers, they'd tend to confirm that the engine is centrifugally supercharged as engines with hair-blowers typically make max. boost near max engine speed. I'll guess that the centrifugally supercharged engine in the C7 ZR1 will be a lot easier to drive than the Roots blown LT4 in the C7 Z06. This is because the vast differences in the boost curves of Roots blown vs centrifugally blown engines. As for the "new" LT5, it will be in the mid-engine car. I'm sticking to my long-time WAG on this. The car will be AWD. The new LT5 will be a DOHC version of the Gen V V8 of 550-600-hp and will drive the rear wheels. The front wheels will be driven by electricity–perhaps wheel motors of maybe 150-200-hp each for a total of 900-1000-hp to the ground. On SIDI and VVT...both have been on Corvette since 2014.
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Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 |
09-02-2017 | #20 | |
Join Date: Jun 2005
Location: CenCoast California
Posts: 899
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Re: More LT5 Rumors
Quote:
What I do know is the engine itself had a valve train limiting speed of 8000 rpm with the production cams. Keep in mind that valve train limiting speed might have been 8000 rpm but I suspect that the cam chains would have significantly reduced reliability/durability if run on an engine which was frequently over 7000-rpm. The engine went to production with a 7072-rpm rev limiter 1) because of concern about accessories, mainly the alternator and power steering pump and 2) because by 7000 rpm was way past peak power.
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Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 |
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