Dyno results
10-21-2019, 01:30 PM
#81
Racer
10-21-2019, 01:33 PM
#82
How much does the SAE process really lower the numbers? Anyone know if Ferrari follows this process? They say the 4.5l 458 engine makes 562hp..... But it doesn't appear to be certified by any process... Just the word of the Italians... And we know what Jeremy Clarkson would say about that.
Looking at various 458 stock dyno articles... on a mustang Dyno it put down only 403hp. Dynojet put down 450.
Is it completely unbelievable that GM can take 6.2L engine and get similar power that Ferrari can get from a 4.5L? Not to mention it's almost a decade later...
Just that GM isn't taking their ABSOLUTE best one off Dyno reading from a special tester engine like Ferrari probably did for that 652hp figure.(something Ferrari has been Known to do in press cars).
GM followed the SAE mandate.... Had they not, they would probably be throwing around a 600hp figure?
Not an expert .. just my 2 cents
Looking at various 458 stock dyno articles... on a mustang Dyno it put down only 403hp. Dynojet put down 450.
Is it completely unbelievable that GM can take 6.2L engine and get similar power that Ferrari can get from a 4.5L? Not to mention it's almost a decade later...
Just that GM isn't taking their ABSOLUTE best one off Dyno reading from a special tester engine like Ferrari probably did for that 652hp figure.(something Ferrari has been Known to do in press cars).
GM followed the SAE mandate.... Had they not, they would probably be throwing around a 600hp figure?
Not an expert .. just my 2 cents
10-21-2019, 01:35 PM
#83
Le Mans Master
Motor Trend = Fake news
People at Motor Trend doing the dyno test are complete morons. The only question in my mind is did they deliberately put out this crap or they are just complete idiots? You decide.
I feel insulted by Motor Trend assuming we are stupid enough to believe their junk journalism. I'm outraged. The C8 is a car the Corvette Team can be very proud to have produced. This 'TEST' really hurts the Corvette image and Motor Trend should be ashamed for publishing this nonsense.
I feel insulted by Motor Trend assuming we are stupid enough to believe their junk journalism. I'm outraged. The C8 is a car the Corvette Team can be very proud to have produced. This 'TEST' really hurts the Corvette image and Motor Trend should be ashamed for publishing this nonsense.
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10-21-2019, 01:39 PM
#84
Instructor
If you look at just the last two MT dyno pulls, both show 478 rwhp. If you then figure 9-10% drivetrain loss, that puts the theoretical crank hp at around 525, which seems within the realm of possibility given the cars performance numbers (1/4 mile at 11.1 sec at 123 mph) and the conservative SAE hp rating.
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10-21-2019, 01:41 PM
#85
Le Mans Master
People at Motor Trend doing the dyno test are complete morons. The only question in my mind is did they deliberately put out this crap or they are just complete idiots? You decide.
I feel insulted by Motor Trend assuming we are stupid enough to believe their junk journalism. I'm outraged. The C8 is a car the Corvette Team can be very proud to have produced. This 'TEST' really hurts the Corvette image and Motor Trend should be ashamed for publishing this nonsense.
I feel insulted by Motor Trend assuming we are stupid enough to believe their junk journalism. I'm outraged. The C8 is a car the Corvette Team can be very proud to have produced. This 'TEST' really hurts the Corvette image and Motor Trend should be ashamed for publishing this nonsense.
10-21-2019, 01:45 PM
#86
Race Director
Simple explanation for this, mt running out of porsche and bmw advertising dollars, they need more from gm, this is the best approach they could come up with,,, of course mt did not cross-reference 0 - 60 and 1/4 mile times with new-found hp, nor did they discuss launch / traction issues if their numbers were accurate.
Upside on this is that mt should have the C8Z at 1,200+ HP when they test it in a few years.
Upside on this is that mt should have the C8Z at 1,200+ HP when they test it in a few years.
10-21-2019, 01:46 PM
#87
Le Mans Master
By discrediting GM's advertised SAE numbers. Or, perhaps insinuating GM provided a ringer to them. I stand by my post. I'm outraged and deeply disappointed by MT's publication.
10-21-2019, 01:47 PM
#88
The Consigliere
Member Since: May 2006
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Good grief, people.
The engine is SAE certified, and as such must be within +/- 2% of its rating.
Secondly, look at the 1/4 mile trap speeds - 121-122 mph.
Both state it's a 495 hp engine.
But, if you want to go ahead and play in fantasy land, knock yourselves out.
The engine is SAE certified, and as such must be within +/- 2% of its rating.
Secondly, look at the 1/4 mile trap speeds - 121-122 mph.
Both state it's a 495 hp engine.
But, if you want to go ahead and play in fantasy land, knock yourselves out.
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10-21-2019, 01:48 PM
#89
Le Mans Master
Simple explanation for this, mt running out of porsche and bmw advertising dollars, they need more from gm, this is the best approach they could come up with,,, of course mt did not cross-reference 0 - 60 and 1/4 mile times with new-found hp, nor did they discuss launch / traction issues if their numbers were accurate.
Upside on this is that mt should have the C8Z at 1,200+ HP when they test it in a few years.
Upside on this is that mt should have the C8Z at 1,200+ HP when they test it in a few years.
10-21-2019, 01:51 PM
#90
I believe the SAE numbers as they have a standard testing methodology. This means that:
1. The dyno being used is wrong.
2. The car is a ringer or altered by GM to get better performance numbers.
I would lean to the dyno being wrong as I don't think GM would be stupid enough to send a ringer to reviewers. If the car actually had these numbers marketing would have had a field day with it.
1. The dyno being used is wrong.
2. The car is a ringer or altered by GM to get better performance numbers.
I would lean to the dyno being wrong as I don't think GM would be stupid enough to send a ringer to reviewers. If the car actually had these numbers marketing would have had a field day with it.
10-21-2019, 01:54 PM
#91
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10-21-2019, 02:10 PM
#94
Melting Slicks
I'm not saying right or wrong on MPH, but according to calculators, and trap speed, that doesn't work with, my engine configuration when it comes to MPH.
Yes my engine would make a little more HP/TQ if I corrected a "Looks" over "Performance" of it intake system, that is 1/2" below 4.0" dia recommended by GM.
It's HP to Weight is 9.96/1, with driver and 4 gallons of fuel.
Below is the 1st time I got car into the 11s. Notice the MPH. 120.0 MPH LOL. Means nothing when you compare it to ET/MPH of my competitor in 1st slip. Next slip MPH dropped as ET came up a little.
117-120 MPH only 360HP Stang or 409HP Jet.
Slow ETs but High MPH on 1/4 mi Black dyno.
Trans gearing, rear gearing, an millisecond shift speed is what contributed to MPH speed VS High ET, after 60 ft.
My goal on below car was to try and get it in 10's with 0nly 400-415 HP Mustang Dyno, but weight with driver of around 2800 Lbs. Peak HP on it's engine is 6600, vs 5850 RPM on other one, so it can better make use of it's same gearing.
Things don't always fit the norn, is all I'm trying to convey
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10-21-2019, 02:19 PM
#95
I laughed so hard reading this complete bullshit article. I like MT up until this point. Do they honestly think we will believe the LT2 makes as much power as the LT4? We arent ******* idiots.
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2021 C8 (10-21-2019)
10-21-2019, 02:34 PM
#98
Instructor
Sounds like the GM engine program in the tested prototype is cutting the max HP in the higher gears ! ( to limit top speed, insurance $$, keep the gov happy, etc ) ...
Cheers
Cheers
10-21-2019, 02:39 PM
#99
Heel & Toe
I do believe the SAE certified horsepower figure of 495 is lower than what you will see these cars making on the dyno because it is intended to be a worst case scenario. Due to truth in advertising laws they have to make sure they cover their own *** and don't have cars testing out at lower than the advertised horsepower figure. Based on the measure curb weight of 3641 plus a 200 lb driver and the 121 MPH recorded trap speed in the 1/4 mile calculations would indicate that the car likely has somewhere in the 530-540 horsepower range. Certainly more than advertised but nowhere near the outrageous 600+ horsepower figures Motor Trend claims (they do say they think something is up but then why even post this article?)
It should also be noted that a ME car with a DCT will have significantly less than 15% drivetrain loss. A more appropriate figure would be somewhere in the 8-10% range.
It should also be noted that a ME car with a DCT will have significantly less than 15% drivetrain loss. A more appropriate figure would be somewhere in the 8-10% range.
10-21-2019, 02:39 PM
#100
