From the SAE, in a new paper on the development of the Gen V engines, presented Tuesday.
""Development of the Combustion System for the General Motors Fifth Generation "Small Block" Engine Family"
You can purcahse it here: http://papers.sae.org/2013-01-1732/ for $24
It contains a dyno plot comparing the LT1 to the LS3. Highlights include:
-peak horsepower occurs at 6400 rpm and is 28kw higher than the LS3 (which peaked at 5900 in the graph). That is 37.5 horsepower improvement.
-peak torque occurs at about 4500 rpm and is 28 n-m higher than the ls3, which shows its peak at 4600 rpm. That is roughly a 20 lb-foot improvement.
-at 2000rpm torque is up roughly 28 lb-feet
-at 3000 rpm torque is up roughly 30 lb-feet
-The LT1s graph goes all the way to 7100rpm, the LS3s stops at roughly 6400 rpm.
-Power at 7100 rpm is down roughly 13 hp from peak in the LT1
That would put the motor at around 470-475hp, 450lb-ft of torque, with a very similar shape to the LS3, just more torque (and, hence, power) across the board.
Of particular note is that this suggests that the motor could rev a bit more, like the LS7. That should have positive implications for performance and sound.
Fuel type was not specified, no mention of E85 was made in the article.
""Development of the Combustion System for the General Motors Fifth Generation "Small Block" Engine Family"
You can purcahse it here: http://papers.sae.org/2013-01-1732/ for $24
It contains a dyno plot comparing the LT1 to the LS3. Highlights include:
-peak horsepower occurs at 6400 rpm and is 28kw higher than the LS3 (which peaked at 5900 in the graph). That is 37.5 horsepower improvement.
-peak torque occurs at about 4500 rpm and is 28 n-m higher than the ls3, which shows its peak at 4600 rpm. That is roughly a 20 lb-foot improvement.
-at 2000rpm torque is up roughly 28 lb-feet
-at 3000 rpm torque is up roughly 30 lb-feet
-The LT1s graph goes all the way to 7100rpm, the LS3s stops at roughly 6400 rpm.
-Power at 7100 rpm is down roughly 13 hp from peak in the LT1
That would put the motor at around 470-475hp, 450lb-ft of torque, with a very similar shape to the LS3, just more torque (and, hence, power) across the board.
Of particular note is that this suggests that the motor could rev a bit more, like the LS7. That should have positive implications for performance and sound.
Fuel type was not specified, no mention of E85 was made in the article.