bad mpg in the s2k?
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From: Longmont, CO
GM's "Displacement on Demand" technology is not included on the Corvette engines, far as I know.
MY 2006 Implementations of Cylinder Deactivation
Company - Models - Engine - Technology -
GM - Envoy Denali, Envoy Denali XL, Trailblazer, Trailblazer EXT, Rainier, Saab 9-7x - 5.3L V8 (LH6) - Displacement on Demand -
GM - Impala, Monte Carlo, Grand Prix - 5.3L V8 (LS4) - Displacement on Demand -
Chrysler - 300C, Magnum, Charger, Durango, Ram 1500, Grand Cherokee, Commander - 5.7L HEMI V8 - Multi-Displacement System -
Honda - Odyssey, Pilot - 3.5L V6 - i-VTEC, VCM -
Honda - Accord Hybrid - 3.0L V6 - i-VTEC, VCM -
MY 2006 Implementations of Cylinder Deactivation
Company - Models - Engine - Technology -
GM - Envoy Denali, Envoy Denali XL, Trailblazer, Trailblazer EXT, Rainier, Saab 9-7x - 5.3L V8 (LH6) - Displacement on Demand -
GM - Impala, Monte Carlo, Grand Prix - 5.3L V8 (LS4) - Displacement on Demand -
Chrysler - 300C, Magnum, Charger, Durango, Ram 1500, Grand Cherokee, Commander - 5.7L HEMI V8 - Multi-Displacement System -
Honda - Odyssey, Pilot - 3.5L V6 - i-VTEC, VCM -
Honda - Accord Hybrid - 3.0L V6 - i-VTEC, VCM -
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From: Vancouver
[QUOTE=Elistan,May 4 2006, 09:22 AM] Despite the fact that the Corvette would be making less hp, there's still more torque being produced by the wheels, therefore faster accerlation than the S2000.
Here's a more familiar example - AP1 S2000 in 1st gear at 7300rpm makes 150 lb-ft and 208 hp.
Here's a more familiar example - AP1 S2000 in 1st gear at 7300rpm makes 150 lb-ft and 208 hp.
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From: Vancouver
Originally Posted by koala,May 3 2006, 08:55 PM
My brother has the top-end Mazda3 GT and he always gets well over 26 MPG in the city.
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From: Longmont, CO
Originally Posted by Race Miata,May 4 2006, 02:01 PM
You fall exactly into the category I mentioned "common misconception about torque and hp".
You can't relate hp to acceleration at different speed with different gearing. Your 1st/2nd gear example is invalid because of that. OTOH, when we compare acceleration at the same speed (as in our S-vs-Z-roll case), it's the hp at that engine speed that matters where gearing and torque do NOT come into play because they cancel out each other. If you have double the torque but half the rpm (making the same hp which is the product of both torque and rpm), you need to double the gearing to get the same speed and therefore cutting the drive torque in half in the process. IOW, for a given speed, it's hp NOT torque that drives the car. This is where the common misconception about torque and hp comes in. This is exactly why 1/4-mile trap speed is related to hp-to-weight ratio NOT torque-to-weight ratio.
You can't relate hp to acceleration at different speed with different gearing. Your 1st/2nd gear example is invalid because of that. OTOH, when we compare acceleration at the same speed (as in our S-vs-Z-roll case), it's the hp at that engine speed that matters where gearing and torque do NOT come into play because they cancel out each other. If you have double the torque but half the rpm (making the same hp which is the product of both torque and rpm), you need to double the gearing to get the same speed and therefore cutting the drive torque in half in the process. IOW, for a given speed, it's hp NOT torque that drives the car. This is where the common misconception about torque and hp comes in. This is exactly why 1/4-mile trap speed is related to hp-to-weight ratio NOT torque-to-weight ratio.
We simply started with different assumptions.At 80mph in 6th gear:
2006 Z06 - 1750 rpm
2003 S2000 - 4200 rpm
2006 S2000 - 4100 rpm
Z06 at 1750 rpm = about 320 lb-ft and 106 hp
AP1 S2000 at 4200 rpm = about 115 lb-ft and 92 hp
AP2 S2000 at 4100 rpm = about 125 lb-ft and 98 hp
Here's the stock Z06 dyno:
http://lgmotorsports.com/gallery/albums/us...0Z06%20dyno.jpg
So yall see? Even with it's rediculously tall 6th gear, the Z06 will still out accelerate an S2000.
ps - an AP1 S2000 with 4.77 gears would be at 4886 rpm and about 106 hp, nearly the same as the Z06.
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Originally Posted by Elistan,May 4 2006, 12:59 PM
ps - an AP1 S2000 with 4.77 gears would be at 4886 rpm and about 106 hp, nearly the same as the Z06.
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From: Vancouver
Originally Posted by Elistan,May 4 2006, 12:59 PM
Ah, I see what's going on - I got confused by your hp calculation results showing the Corvette being slower...
P.S. I know a top-gear 60mph roll doesn't do justice to both cars. This is just an illustration.
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From: Longmont, CO
Originally Posted by RACER,May 4 2006, 03:46 PM
All the Z06 would have to do is down shift a gear or two
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From: Longmont, CO
Originally Posted by Race Miata,May 4 2006, 03:51 PM
From the trend in your Z06 graph, it's more like <300lb-ft at 1750rpm for the Z06 which gives <100hp. And I thought we were talking about 60mph-roll, which the Z06 would be bogging at 1300rpm and making <250lb-ft (notice the torque drop that low down the rpm) and <60hp. Stock AP1 torque curve stays flat down to 2500rpm and even at 3150rpm at 60mph, the engine is still making 125lb-ft and 74hp, which is >60hp the Z06 is struggling with. And don't forget the extra weight the Z06 has to be hauling.
P.S. I know a top-gear 60mph roll doesn't do justice to both cars. This is just an illustration.
P.S. I know a top-gear 60mph roll doesn't do justice to both cars. This is just an illustration.
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From: Pleasant Grove, UT
i have been getting mid to upper 20mpg depending on if i am driving conservativly or not. I try to drive it pretty easy though since in alaska we dont have high enough octane for the car, so i have to get a 10 dollar octane booster everytime i fill up. Oh well though, it is worth it since it is a sweet car.