Dyno comparison of LT1 VS LS7 vs LS3

DemonZL1 · 09-04-2015, 06:04 PM

Thought it was a pretty neat comparison, I had seen it before but came across it again today and thought someone else may find it useful.

Taken from http://www.corvetteforum.com/forums/...hennessey.html

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Name: Screen Shot 2015-09-07 at 8.17.10 AM.jpg
Views: 37770
Size: 123.7 KB

Bhobbs · 09-04-2015, 06:29 PM

The LT1 falls on its ass at 4800 rpm. I wonder what causes that.

Waiting46 · 09-04-2015, 07:16 PM

they all make max power at almost exactly the same point

mcsoul · 09-04-2015, 07:50 PM

LT-1 is right with the LS7 in the lower parts of the torque curve. That's a really good sign for how it will get around a track in 3rd gear on the manual gear box.

Z_Rocks · 09-04-2015, 08:02 PM

I also wonder why LT1's TQ drops quickly after 4800?

Here is a dyno chart of a 2015 Mustang GT and the TQ stays pretty flat between 4000 and 5000.

Blackdevil77 · 09-04-2015, 08:52 PM

Even though the torque drops off more abruptly than the others, it still remains above the LS3 throughout the whole rev range. There must be some kind of restriction that causes it to drop like that. Probably has something to do with the cam, the LT1 has displacement on demand, right?

NASTY99Z28 · 09-05-2015, 02:04 AM

Quote:

Originally Posted by Z_Rocks

I also wonder why LT1's TQ drops quickly after 4800?

Here is a dyno chart of a 2015 Mustang GT and the TQ stays pretty flat between 4000 and 5000.

The beauty of having DOHC with the ability to retard and advance the timing on the go.

Z_Rocks · 09-05-2015, 02:37 AM

Quote:

Originally Posted by NASTY99Z28

I like my woman like my milk shakes, THICK!!!!

You still drink milk shakes...?

LesserO2Evils · 09-05-2015, 05:42 AM

When I see the HP and TQ meeting like that, at such a low rpm, my thoughts INSTANTLY go to air flow. But idk much about the LT1 engine. Thats kinda why I wanted the mods to start a "Performance" section. The engine and tranny are new to most of us. Would be nice to have a section where we could all learn about them together.

rayhawk · 09-05-2015, 06:54 AM

Quote:

Originally Posted by LesserO2Evils

When I see the HP and TQ meeting like that, at such a low rpm, my thoughts INSTANTLY go to air flow. But idk much about the LT1 engine. Thats kinda why I wanted the mods to start a "Performance" section. The engine and tranny are new to most of us. Would be nice to have a section where we could all learn about them together.

HP and torque always meet at 5252 rpm, that is how the formula works. Given the RPM and the torque, you can calculate hp at any point.

HP=Torque*RPM/5252
Torque=HP*5252/RPM

LesserO2Evils · 09-05-2015, 12:08 PM

Quote:

Originally Posted by rayhawk

HP and torque always meet at 5252 rpm, that is how the formula works. Given the RPM and the torque, you can calculate hp at any point.

HP=Torque*RPM/5252
Torque=HP*5252/RPM

Ive got a rule. Never drink and post. I broke that rule last night...lol
What I MEANT to say was, it appears that the LT1 drops off in TQ earlier than the LSx engines. Which makes me wonder if its running out of breath too soon? Which, after re-reading, I see everyone has asked the same ???

NASTY99Z28 · 09-05-2015, 12:56 PM

Quote:

Originally Posted by Z_Rocks

You still drink milk shakes...?

Hell yeah!!! You don't?

Quote:

Originally Posted by LesserO2Evils

Ive got a rule. Never drink and post. I broke that rule last night...lol
What I MEANT to say was, it appears that the LT1 drops off in TQ earlier than the LSx engines. Which makes me wonder if its running out of breath too soon? Which, after re-reading, I see everyone has asked the same ???

Lol...I was wondering why you said that.

NASTY99Z28 · 09-05-2015, 12:58 PM

Quote:

Originally Posted by LesserO2Evils

Ive got a rule. Never drink and post. I broke that rule last night...lol
What I MEANT to say was, it appears that the LT1 drops off in TQ earlier than the LSx engines. Which makes me wonder if its running out of breath too soon? Which, after re-reading, I see everyone has asked the same ???

I think they went with a smaller cam profile than the ls3 had yet still made more power. Compression and direct injection help.

Noob · 09-05-2015, 01:01 PM

Quote:

Originally Posted by NASTY99Z28

The beauty of having DOHC with the ability to retard and advance the timing on the go.

THIS !

i always found the coyote more agile, better flexibility compared to the 2012 SS and the C7 engine.
i mean, chevy has modern 4cyil Turbo´s, V6´s and V6 with turbo all with DOHC and VVT but their 8cyl. have only 1cam and 2valve/cyl. that´s completely outdated.
sure they compensate it with more capacity but our magazine wrote " It´s a funny mix what chevy offers us in their C7 engine."

09-04-2015, 06:04 PM	#1
DemonZL1 199 Drives: like a granny Join Date: Apr 2013 Location: Utah, USA Posts: 1,916	Dyno comparison of LT1 VS LS7 vs LS3 Thought it was a pretty neat comparison, I had seen it before but came across it again today and thought someone else may find it useful. Taken from http://www.corvetteforum.com/forums/...hennessey.html __________________ 2023 Silverado LZ0 Duramax 2021 Shock SS 1LE A10 www.youtube.com/@DemonWorksPerformance Anderson composites coupon code : Demon

09-04-2015, 06:29 PM	#2
Bhobbs Drives: 2015 SS 1LE Red Hot, 1970 Chevelle Join Date: Apr 2012 Location: Chino, CA Posts: 6,989	The LT1 falls on its ass at 4800 rpm. I wonder what causes that. __________________

09-04-2015, 08:02 PM	#5
Z_Rocks Drives: everyone crazy... Join Date: May 2009 Location: SW Florida Posts: 2,109	I also wonder why LT1's TQ drops quickly after 4800? Here is a dyno chart of a 2015 Mustang GT and the TQ stays pretty flat between 4000 and 5000. Last edited by Z_Rocks; 09-04-2015 at 08:13 PM.

09-05-2015, 05:42 AM	#9
LesserO2Evils GM repeat offender... Drives: 16 2SS Join Date: Dec 2014 Location: Grandview, Texas Posts: 1,474	When I see the HP and TQ meeting like that, at such a low rpm, my thoughts INSTANTLY go to air flow. But idk much about the LT1 engine. Thats kinda why I wanted the mods to start a "Performance" section. The engine and tranny are new to most of us. Would be nice to have a section where we could all learn about them together. __________________ '16 2SS, Summit White. A8. MRC. NPP. Ordered:09/03/15. Received 12/22/15 INCOMING: ‘22 ZL1, Satin Steel. A10. PDR. Ordered: 03/02/22.

09-04-2015, 07:16 PM	#3
Waiting46 Drives: 1981 silver corvette,Hyper Blue 2SS Join Date: May 2015 Location: Ohio Posts: 625	they all make max power at almost exactly the same point

09-04-2015, 07:50 PM	#4
mcsoul Drives: Want a gen 6 Join Date: Jan 2013 Location: 75089 Posts: 1,032	LT-1 is right with the LS7 in the lower parts of the torque curve. That's a really good sign for how it will get around a track in 3rd gear on the manual gear box.

09-04-2015, 08:52 PM	#6
Blackdevil77 Drives: 2008 Pontiac G8 GT, Shelby GT500 Join Date: Mar 2011 Location: Long Island, New York Posts: 1,376	Even though the torque drops off more abruptly than the others, it still remains above the LS3 throughout the whole rev range. There must be some kind of restriction that causes it to drop like that. Probably has something to do with the cam, the LT1 has displacement on demand, right?

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