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


Attachment 742544

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

they all make max power at almost exactly the same point

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.

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.

http://files.americanmuscle.com/wp-c...mance-tune.jpg

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?

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

You still drink milk shakes...? :smiling1:

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

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 ???

Hell yeah!!! You don't?
Lol...I was wondering why you said that.

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

THIS !:hail: 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 that´s completely outdated.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."