Chevy to prevail the Muscle Car War with the Z28?
03-08-2012, 10:33 PM
#121
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Hm, thanks for the correction. Most of the stuff Ive read about turbocharging/supercharging a LS7(which aint much I must admit) said the block`s cylinder walls were quite thin and that they had problems going much over 1000hp, but I havent seen anything detailing a FI LS7 for quite a few years now.
Also, why not just go with a 6.6L Duramax in the new Z28? That would be perfect.
Also, why not just go with a 6.6L Duramax in the new Z28? That would be perfect.
03-10-2012, 11:26 AM
#122
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Personally,I think GM should wait for a smaller, lighter Camaro platform before bringing back the Z28. They aren't going to be able to take much weight out of the current chassis without it getting unnecessarily expensive. And using the LS7 wouldn't be practical either unless you want the Z to be very low production...and very expensive.
But if they are going to insist on making a 5th gen based Z28, they should just take the SS, fit it with the ZL-1's suspension, lightweight rims, and carbon brakes...then tune the hell out of it. IMO, right now that's the best formula for creating a Camaro that can compete with the Boss.
But if they are going to insist on making a 5th gen based Z28, they should just take the SS, fit it with the ZL-1's suspension, lightweight rims, and carbon brakes...then tune the hell out of it. IMO, right now that's the best formula for creating a Camaro that can compete with the Boss.
03-10-2012, 12:12 PM
#123
Personally,I think GM should wait for a smaller, lighter Camaro platform before bringing back the Z28. They aren't going to be able to take much weight out of the current chassis without it getting unnecessarily expensive. And using the LS7 wouldn't be practical either unless you want the Z to be very low production...and very expensive.
But if they are going to insist on making a 5th gen based Z28, they should just take the SS, fit it with the ZL-1's suspension, lightweight rims, and carbon brakes...then tune the hell out of it. IMO, right now that's the best formula for creating a Camaro that can compete with the Boss.
But if they are going to insist on making a 5th gen based Z28, they should just take the SS, fit it with the ZL-1's suspension, lightweight rims, and carbon brakes...then tune the hell out of it. IMO, right now that's the best formula for creating a Camaro that can compete with the Boss.
They could even squeeze a few horsepower out of it as well (much like the Boss 302 motor does over the base GT motor) through the use of Direct Injection, VVT etc. The upcoming 2014 Corvette C7 might hint at what's to come for the future of the (Gen V) V8 line.
03-12-2012, 06:48 PM
#125
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I couldn't agree with you more.
They could even squeeze a few horsepower out of it as well (much like the Boss 302 motor does over the base GT motor) through the use of Direct Injection, VVT etc. The upcoming 2014 Corvette C7 might hint at what's to come for the future of the (Gen V) V8 line.
They could even squeeze a few horsepower out of it as well (much like the Boss 302 motor does over the base GT motor) through the use of Direct Injection, VVT etc. The upcoming 2014 Corvette C7 might hint at what's to come for the future of the (Gen V) V8 line.
03-12-2012, 07:07 PM
#126
No one (outside of those designing/manufacturing/building the car) knows exactly just yet, other than it will likely have Direct Injection and be at least 5.5L (I'm hoping that it remains at 6.2L or goes even larger (6.4L?) but that's highly unlikely).
I only mentioned that above because once we know more/see the actual C7 in the flesh (less than 11 months from right now) we'll get a better idea of what kind of motors/transmissions that future Camaros and trucks might get as well.
I only mentioned that above because once we know more/see the actual C7 in the flesh (less than 11 months from right now) we'll get a better idea of what kind of motors/transmissions that future Camaros and trucks might get as well.
03-12-2012, 07:52 PM
#127
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According to Motor Trend, GM executives have been planning the next-generation (C7) Corvette since 2007. The car was originally planned for the 2011 model year (to coincide with the 100th anniversary of Chevrolet), but was delayed, and currently expected to arrive in fall 2013 as a 2014 model year. Mid-engine and rear-engine layouts had been considered, but the front-engine, rear-wheel drive (RWD) platform will continue to keep costs lower and the engine compact. The seventh generation Corvette is still in development, but is widely believed to be publicly unveiled by 2012, but may be delayed further depending on the scope of upcoming Corporate Average Fuel Economy (CAFE) regulations. The Corvette C7 will come equipped with Chevrolet's upcoming 5.5 L small block V8 that features a number of technical advancements including an aluminum block and heads and a revised combustion system. The engine will retain the pushrod, overhead valve design configuration. The new 5.5 L V8 made its world debut in the C6.R racecar. Power will likely total 440 hp (328 kW), an improvement over the 436 horsepower available currently in the Corvette C6, but with improved fuel economy due to the new engine's smaller size and advanced features. The engine is part of a new $890 million program committed for vehicles across the GM lineup. A twin-turbo V6 engine may or may not be available as an option.
Car and Driver said in April 2011, "We anticipate change in the C7 will be apparent at a glance, even to casual observers." "It seems certain the coupe will feature a split rear window – a la the one-year Sting Ray coupe of 1963. In this case it will be an optional feature. An Interior makeover is expected with upgraded materials with seats comparing favorably with the buckets found in Porsches and BMWs. The front-engine Y platform will be essentially unchanged from the C6 with an improvement expected in steering linearity and feel. The Z06 and ZR1 will continue, while the Grand Sport may become the base model. The C7 should hit dealerships in fall of 2013
Car and Driver said in April 2011, "We anticipate change in the C7 will be apparent at a glance, even to casual observers." "It seems certain the coupe will feature a split rear window – a la the one-year Sting Ray coupe of 1963. In this case it will be an optional feature. An Interior makeover is expected with upgraded materials with seats comparing favorably with the buckets found in Porsches and BMWs. The front-engine Y platform will be essentially unchanged from the C6 with an improvement expected in steering linearity and feel. The Z06 and ZR1 will continue, while the Grand Sport may become the base model. The C7 should hit dealerships in fall of 2013
03-13-2012, 11:45 AM
#129
Everything I hear says the 5.5 is race only. Street motors will be 5.3 DI and 6.2 DI.
The current 5.5 Race motor has somewhere between a 4.155 and 4.180 bore. The LS7 had a 4.125 bore which would be about the max for a street motor. With current GM bores you would have to run the LS3 bore with a 4.8 crank to get to around 5.5. A large bore has a negative impact on mileage. To make a significant improvement in mileage over a 6.2 you would have to cut down the bore to get there. I doubt any of us want a sub 3.8 bore with 3.63 stroke motor. So if you are married to a LS3 bore there is little value to destroking to 5.5.
The current 5.5 Race motor has somewhere between a 4.155 and 4.180 bore. The LS7 had a 4.125 bore which would be about the max for a street motor. With current GM bores you would have to run the LS3 bore with a 4.8 crank to get to around 5.5. A large bore has a negative impact on mileage. To make a significant improvement in mileage over a 6.2 you would have to cut down the bore to get there. I doubt any of us want a sub 3.8 bore with 3.63 stroke motor. So if you are married to a LS3 bore there is little value to destroking to 5.5.
Last edited by SSCamaro99_3; 03-13-2012 at 11:53 AM.
03-13-2012, 12:19 PM
#131
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03-13-2012, 04:41 PM
#132
Everything I hear says the 5.5 is race only. Street motors will be 5.3 DI and 6.2 DI.
The current 5.5 Race motor has somewhere between a 4.155 and 4.180 bore. The LS7 had a 4.125 bore which would be about the max for a street motor. With current GM bores you would have to run the LS3 bore with a 4.8 crank to get to around 5.5. A large bore has a negative impact on mileage. To make a significant improvement in mileage over a 6.2 you would have to cut down the bore to get there. I doubt any of us want a sub 3.8 bore with 3.63 stroke motor. So if you are married to a LS3 bore there is little value to destroking to 5.5.
The current 5.5 Race motor has somewhere between a 4.155 and 4.180 bore. The LS7 had a 4.125 bore which would be about the max for a street motor. With current GM bores you would have to run the LS3 bore with a 4.8 crank to get to around 5.5. A large bore has a negative impact on mileage. To make a significant improvement in mileage over a 6.2 you would have to cut down the bore to get there. I doubt any of us want a sub 3.8 bore with 3.63 stroke motor. So if you are married to a LS3 bore there is little value to destroking to 5.5.
And I highly doubt that they will revive the 'LT1' moniker for the C7's engine, it's just too soon and too close to the 1996 C4 (and 1997 F-body V8) era for them to do that. Although, back in 1992 when they did it it was only 20 years or so since it was used previously so anything's possible I suppose LOL.
I'm thinking something like 'LS5' or 'LS8' maybe?
03-14-2012, 02:08 PM
#135
I agree. I've even read that the current (6.2L) bore size will absolutely be retained, just not sure on the stroke. But again it's still all just hearsay.
And I highly doubt that they will revive the 'LT1' moniker for the C7's engine, it's just too soon and too close to the 1996 C4 (and 1997 F-body V8) era for them to do that. Although, back in 1992 when they did it it was only 20 years or so since it was used previously so anything's possible I suppose LOL.
I'm thinking something like 'LS5' or 'LS8' maybe?
And I highly doubt that they will revive the 'LT1' moniker for the C7's engine, it's just too soon and too close to the 1996 C4 (and 1997 F-body V8) era for them to do that. Although, back in 1992 when they did it it was only 20 years or so since it was used previously so anything's possible I suppose LOL.
I'm thinking something like 'LS5' or 'LS8' maybe?
http://api.viglink.com/api/click?for...13317520510182
03-14-2012, 10:23 PM
#136
Found out yesterday the 5.5 race motor is 4.090x3.185.
http://api.viglink.com/api/click?for...13317520510182
http://api.viglink.com/api/click?for...13317520510182
The Corvette C6.R race cars' 5.5-liter Chevrolet small-block V8s are developed, built and maintained by GM. The Corvette C6.Rs' LS5.5R is a naturally aspirated race engine, based on the Corvette Z06's 7.0-liter LS7 engine (which in turn was developed with the 7.0L race engine used in the C6.R GT1 cars), built on production cast-aluminum cylinder blocks.
And that's why I don't believe that the base C7 will have a 5.5L motor in it (as so many are already talking as if it's fact)...because 1) the 5.5L only exists to meet those particular class rules and 2) the base Corvette would not use a variation on the more costly LS7 motor (or any 'racing based' motor for that matter).
But I dunno.
03-15-2012, 12:01 PM
#137
Yes, good info, I think it's essentially a de-stroked LS7 (427)?
The Corvette C6.R race cars' 5.5-liter Chevrolet small-block V8s are developed, built and maintained by GM. The Corvette C6.Rs' LS5.5R is a naturally aspirated race engine, based on the Corvette Z06's 7.0-liter LS7 engine (which in turn was developed with the 7.0L race engine used in the C6.R GT1 cars), built on production cast-aluminum cylinder blocks.
And that's why I don't believe that the base C7 will have a 5.5L motor in it (as so many are already talking as if it's fact)...because 1) the 5.5L only exists to meet those particular class rules and 2) the base Corvette would not use a variation on the more costly LS7 motor (or any 'racing based' motor for that matter).
But I dunno.
The Corvette C6.R race cars' 5.5-liter Chevrolet small-block V8s are developed, built and maintained by GM. The Corvette C6.Rs' LS5.5R is a naturally aspirated race engine, based on the Corvette Z06's 7.0-liter LS7 engine (which in turn was developed with the 7.0L race engine used in the C6.R GT1 cars), built on production cast-aluminum cylinder blocks.
And that's why I don't believe that the base C7 will have a 5.5L motor in it (as so many are already talking as if it's fact)...because 1) the 5.5L only exists to meet those particular class rules and 2) the base Corvette would not use a variation on the more costly LS7 motor (or any 'racing based' motor for that matter).
But I dunno.
I agree with a street 5.5 being fanatasy. If the 4.06 bore is to be retained, there is almost no value in destroking to 3.25 from 3.62. MPG increase gain would be negligible, and streetable torque would suffer. Would also be more cost effective to retain all the equipment for the 6.2's 4.06x3.62 configuration, and add the DI head and fuel system.
03-15-2012, 01:36 PM
#138
I remember years ago before the LS3 even came out that there was even talk of a 6.3L or 6.4L so I've been hoping for an increase like that as well. But in these more stringent economic times and ever increasing fuel prices I don't see that happening at all.
03-16-2012, 02:49 PM
#140
Might even come in under 3600 pounds (both the ATS-V and the new Camaro version of that platform) which would be VERY nice. 