Fgts Posted June 2, 2019 Share Posted June 2, 2019 It's a diesel and there similar engine outputs from GM and Ram, still don't take from the fact Germans underrated their engine outputs in their luxury cars these days. Quote Link to comment Share on other sites More sharing options...
akirby Posted June 3, 2019 Share Posted June 3, 2019 4 hours ago, Fgts said: It's a diesel and there similar engine outputs from GM and Ram, still don't take from the fact Germans underrated their engine outputs in their luxury cars these days. What happens to hp if you take an engine that makes 375 hp and 400 lb/ft and you move the peak torque (same 400 lb/ft) to a lower rpm for better off the line performance? Quote Link to comment Share on other sites More sharing options...
J-150 Posted June 3, 2019 Share Posted June 3, 2019 On 5/31/2019 at 1:18 PM, Trailhiker said: I agree...calling this The 'V' instead of 'V-Sport' is like calling the ecoboost Mustang a GT, and saying wait for the GT+ to come out next year! You mean like GT350 and GT500? Oh wait, they already do that. Quote Link to comment Share on other sites More sharing options...
rperez817 Posted June 3, 2019 Share Posted June 3, 2019 10 hours ago, akirby said: What happens to hp if you take an engine that makes 375 hp and 400 lb/ft and you move the peak torque (same 400 lb/ft) to a lower rpm for better off the line performance? It could increase, decrease, or stay the same. All depends on the specific tuning applied to achieve the revised torque curve. Quote Link to comment Share on other sites More sharing options...
akirby Posted June 3, 2019 Share Posted June 3, 2019 14 minutes ago, rperez817 said: It could increase, decrease, or stay the same. All depends on the specific tuning applied to achieve the revised torque curve. Wrong. It HAS to decrease if the torque curve moves lower in the rpm band because it’s a simple mathematic formula. Diesels produce their power at very low rpm which is why their hp ratings are so much lower than their torque ratings. hp = torque * rpm / 5252 The point is that it’s not necessarily underrating HP just because it’s lower than before. It could just be the way they tuned it. And lower hp doesn’t necessarily mean lower performance especially if the torque remains the same. The Germans have been known to understate power. But not GM and especially not when they’re competing with Lincoln. Quote Link to comment Share on other sites More sharing options...
rperez817 Posted June 3, 2019 Share Posted June 3, 2019 46 minutes ago, akirby said: Wrong. It HAS to decrease if the torque curve moves lower in the rpm band because it’s a simple mathematic formula. Diesels produce their power at very low rpm which is why their hp ratings are so much lower than their torque ratings. hp = torque * rpm / 5252 The point is that it’s not necessarily underrating HP just because it’s lower than before. It could just be the way they tuned it. And lower hp doesn’t necessarily mean lower performance especially if the torque remains the same. The Germans have been known to understate power. But not GM and especially not when they’re competing with Lincoln. My misinterpretation about what you meant by "power". The formula says power at peak torque rpm will decrease if the torque curve is modified as you described. But peak power (which is usually at a different rpm than peak torque) can increase, decrease, or stay the same. All depends on the specific tuning of the engine as I mentioned previously. We'll have to wait until the CT4-V and CT5-V come out and multiple third party firms do some dyno tests to find out if their power ratings are understated. But GM has done it before. One of the most dramatic example of understated power ratings in automotive history was the legendary L88 427 big block Chevy engine. More recently, a dyno test done on the Cadillac ATS-V LF4 twin turbo suggests it is understated. But at least one additional dyno test by a different firm would be needed to confirm. https://jalopnik.com/here-s-how-much-horsepower-the-cadillac-ats-v-really-ma-1786968718 What makes you think CT4-V is competing with Lincoln? Quote Link to comment Share on other sites More sharing options...
92merc Posted June 3, 2019 Share Posted June 3, 2019 3 minutes ago, rperez817 said: What makes you think CT4-V is competing with Lincoln? What makes Cadillac think competes with BMW? 1 Quote Link to comment Share on other sites More sharing options...
twintornados Posted June 3, 2019 Share Posted June 3, 2019 17 minutes ago, 92merc said: What makes Cadillac think competes with BMW? Because Cadillac will tell you it builds "BMW beaters" 1 Quote Link to comment Share on other sites More sharing options...
akirby Posted June 3, 2019 Share Posted June 3, 2019 There were incentives to underrate engines back in the 60s and 70s. Not so much today. I'm not saying they did or they didn't I'm just saying the 335 hp figure by itself doesn't mean they're underrating it. Quote Link to comment Share on other sites More sharing options...
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