LT1 Underrated?

M12LRV · 07-24-2015, 02:20 AM

Is the general consensus that the LT1 is underrated? The stingray with performance exhaust seems to be dynoing at about 405-410 whp. Assuming a 15% drivetrain loss, should mean the LT1 makes about 480 at the crank.

ULTRAZLS1 · 07-24-2015, 03:51 AM

You can guess all you want.

or just read the facts

http://www.sae.org/certifiedpower/details.htm

No motor since the mid 2000's that is sae certified is underrated. They all make within 1% of advertised rating.

The end.

Tractionless · 07-24-2015, 05:13 AM

^^^ This.

Davy_Baby9 · 07-24-2015, 05:35 AM

Except for the new M4.

SpeedIsLife · 07-24-2015, 07:04 AM

Which does not SAE certify

xgnxs · 07-24-2015, 07:33 AM

Drivetrains are getting more efficient. If you assume a loss of 12%, the math works out just fine. No one is underrating engines.

Jeffro19 · 07-24-2015, 07:36 AM

Hellcat is underrated as well not 100% sure if it's SAE certified but I'm pretty sure it is. Correction it is SAE certified.

GretchenGotGrowl · 07-24-2015, 07:58 AM

Maybe what you are seeing is optimistic chassis dynos and more efficient drivetrains instead of underrated SAE numbers.

IOMike · 07-24-2015, 07:58 AM

Why do people think that drivetrain loss is a static number?

It boggles my mind. You guys are way over simplifying it.

Z_Rocks · 07-24-2015, 08:03 AM

Quote:

Originally Posted by Jeffro19

Hellcat is underrated as well not 100% sure if it's SAE certified but I'm pretty sure it is. Correction it is SAE certified.

I agree. I met a guy last week who just picked up his new Challenger M6 and after 38 miles, had it dynoed in the hot humid weather in Florida and got 640 RWHP. Even at 12% loss, that 727 to crank.

Jeffro19 · 07-24-2015, 08:07 AM

Quote:

Originally Posted by Z_Rocks

I agree. I met a guy last week who just picked up his new Challenger M6 and after 38 miles, had it dynoed in the hot humid weather in Florida and got 640 RWHP. Even at 12% loss, that 727 to crank.

Wow not even broke in. Either they are overrated or they have the most efficient powertrain ever, I highly doubt that though.

SpeedIsLife · 07-24-2015, 08:11 AM

Dyno numbers vary greatly, are insanely easy to manipulate and are not directly comparable.

That being said it appears that the new 8 speed automatic in both the General Motors and Mopar cars are very efficient and have a fairly low loss amount.

SuperSound · 07-24-2015, 09:15 AM

Quote:

Originally Posted by Z_Rocks

I agree. I met a guy last week who just picked up his new Challenger M6 and after 38 miles, had it dynoed in the hot humid weather in Florida and got 640 RWHP. Even at 12% loss, that 727 to crank.

No underrating with SAE. Just a chassis dyno being inaccurate as usual. Could have probably put a C7 on it that day and came up with a similar underrate.

Quote:

Originally Posted by SpeedIsLife

Dyno numbers vary greatly, are insanely easy to manipulate and are not directly comparable.

That being said it appears that the new 8 speed automatic in both the General Motors and Mopar cars are very efficient and have a fairly low loss amount.

Exactly. 12% is probably on the high side for these new autos. BMW is one of the few manufactures not SAE rating their engines. My N20 (2.0T) in mine is supposed to make 240BHP. That's what it usually puts down on the dyno at the rear wheels. Which is why the ATS 2.0T performs so close to it but is SAE rated at 275BHP.

IOMike · 07-24-2015, 10:46 AM

Again.... You can't just apply a percentage to a crank number to get whp. It's not a static percentage of drivetrain loss.

07-24-2015, 02:20 AM	#1
M12LRV Drives: . Join Date: Jul 2015 Location: . Posts: 121	LT1 Underrated? Is the general consensus that the LT1 is underrated? The stingray with performance exhaust seems to be dynoing at about 405-410 whp. Assuming a 15% drivetrain loss, should mean the LT1 makes about 480 at the crank.

07-24-2015, 07:36 AM	#7
Jeffro19 Drives: 2018 ZL1 6M, Silverado High Country Join Date: Oct 2008 Location: San Antonio, Tx Posts: 2,101	Hellcat is underrated as well not 100% sure if it's SAE certified but I'm pretty sure it is. Correction it is SAE certified. __________________ Previous Camaro's - 2002 Z28 6 spd manual, T tops, Sebring Silver - 2010 2SS 6 spd manual, Cyber Gray Metallic Current Vehicles - 2018 ZL1 Red Hot 6 spd manual, Carbon Hood, Sunroof 2019 Silverado High Country, Daily Driver

07-24-2015, 07:58 AM	#8
GretchenGotGrowl Drives: 11 F150 EB/13 Sonic RS/15 Z06 Join Date: Sep 2010 Location: Little Rock, AR Posts: 7,129 View My Garage	Maybe what you are seeing is optimistic chassis dynos and more efficient drivetrains instead of underrated SAE numbers. __________________ New Ride -- 2015 Z06 2LZ (stock) -- Journal Old Ride -- 2012 Camaro 2LT/RS (647 RWHP & 726 RWTQ) -- Build Thread

07-24-2015, 03:51 AM	#2
ULTRAZLS1 Drives: 14 Silverado LTZ Z71, 16 Camaro SS Join Date: Nov 2009 Location: Jackson, Michigan Posts: 4,407	You can guess all you want. or just read the facts http://www.sae.org/certifiedpower/details.htm No motor since the mid 2000's that is sae certified is underrated. They all make within 1% of advertised rating. The end.

07-24-2015, 05:13 AM	#3
Tractionless Drives: '03 Silverado Join Date: Jun 2015 Location: Edinburg, Texas Posts: 52	^^^ This.

07-24-2015, 05:35 AM	#4
Davy_Baby9 Drives: Duramax Join Date: Jun 2015 Location: Michigan Posts: 174	Except for the new M4.

07-24-2015, 07:04 AM	#5
SpeedIsLife Drives: Current Camaro-less Join Date: Jul 2014 Location: Oregon Posts: 3,242	Which does not SAE certify

07-24-2015, 07:33 AM	#6
xgnxs Drives: 2005 Cobalt Base - 5 speed Join Date: Apr 2015 Location: Ohio Posts: 444	Drivetrains are getting more efficient. If you assume a loss of 12%, the math works out just fine. No one is underrating engines.

07-24-2015, 07:58 AM	#9
IOMike Drives: 2022 F150, 87 Monte Carlo Join Date: Mar 2015 Location: MN Posts: 1,267	Why do people think that drivetrain loss is a static number? It boggles my mind. You guys are way over simplifying it.

07-24-2015, 08:11 AM	#12
SpeedIsLife Drives: Current Camaro-less Join Date: Jul 2014 Location: Oregon Posts: 3,242	Dyno numbers vary greatly, are insanely easy to manipulate and are not directly comparable. That being said it appears that the new 8 speed automatic in both the General Motors and Mopar cars are very efficient and have a fairly low loss amount.

07-24-2015, 10:46 AM	#14
IOMike Drives: 2022 F150, 87 Monte Carlo Join Date: Mar 2015 Location: MN Posts: 1,267	Again.... You can't just apply a percentage to a crank number to get whp. It's not a static percentage of drivetrain loss.

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