brentil

I scaled and overlayed my 2009 C6 LS3 dyno graph that was done at Superchips over the C7 one shown today by Lingenfelter. My car was stock with the NPP at the time of the dyno run using 93 octane.

Dyno comparisons across vehicles are never scientific but it's a rough idea for comparison.

MitchAlsup

The torque graph shows the C7 above the C6 all the way,
BUT
the HP graph shows the C7 under the C6 until 65 MPH,

Thus somebody screwed up one of the axes; it can't work that way.
HP[rpm] = TQ[rpm]*rpm/5252

335i

Agreed. If the torque graph is right though, that's a pretty nice improvement.

brentil

Like I said it's an overlay, they're not graphed in the same software. I used Paint.net to scale and layer. Also dyno runs are not 100% anyways.

EvanZR1

Here's one from my stock 2013 GS that is scaled to match:

Shurshot

Better to show broken lines versus subtle color differences when doing an overlay ......... just saying

EvanZR1

Yeah I realized after I did it. That one's easy though, the C6 is the lower of the two. I also did one vs my C6 with just Z06 exhaust manifolds & H-pipe (stock tune & filter):

I did the C6 in red, but it's still not the easiest to make out. The upper end is very similar, but the C7 has a big TQ/HP bump down low.

Wallacefl

very nice comparison ...now I would like to see the Lingenfelter LS3 525 package dyno sheet on their site versus the C7...and the 525 package does not use an upgraded exhaust manifold such as the LS7/ZR1 or new C7.

Z51 6spd

The C7 power increase over the C6 is minimal. Although the weight increase in the C7 is substantial when compared to a base C6. I am a corvette lover and I really like the C7, but the power could have been better.

racerns

You are comparing STD correction to SAE correction. This is not a valid comaprison. STD correction is always going to give you much higher numbers than SAE. You peak stock 401 hp STD = 382 hp SAE and your modded 414 hp STD = 395 hp SAE. You would see a much bigger difference in the graphs if you were comaparing apples to apples.

I would recommend taking your charts down since they will just confuse people.

robvuk

Especially since the graph is displayed in MPH instead of RPM.

Snorman

Good catch.
I 'thought' the difference when corrected to STD was about 2.6%, but either way, the LS3 is not making close to the same power as the LT1 stock vs. stock. Lingenfelter posted overlays of an LT1, LS3 and LS7 here...
http://forums.corvetteforum.com/1584989050-post54.html
Scaled the same, same smoothing, all SAE.
S.

gthal

Wow... that makes the LT1 look even stronger relative to the LS3 and effectively the same as the LS7 to 5,000 RPM

EvanZR1

Stupid Dynojet software (I had it at SAE, not sure why it changed) I'll reset it to SAE and repost later.

Snorman

And those were cars dyno'd by LPE on the same dyno.

S.

TTRotary

The LT1 makes 29 horses more than the LS3, or 6% more power at these HP levels. That's not much. The torque here is the big story, and that is up by a lot.

Leveling to SAE won't make a ton of difference here. The numbers on the first graph are right where they should be for the respective engines. Peak power of 388 for the LS3 and 416 for the LT1.

Snorman

IMO 29 rwhp is substantial base car vs. base car and should translate to 3-4 mph trap speed differences. Agree...huge torque increase.
Correct...the first posted graph was SAE vs. SAE, the 2nd and 3rd were SAE vs. STD.
S.

gthal

LS7 > LT1 by 36.6HP at peak
LT1 > LS3 by 31.1HP at peak

But you are right... if you look at the torque increase of the LT1 across the RPM range and the extra area under the HP curve vs. the LS3, the differences are meaningful... very meaningful. What impresses me most is the LS7 and LT1 graphs to 5,000RPM... effectively identical. After 5,000RPM, the LS7 walks away (and it weighs less) but until then, the LT1 is impressive!!

Snorman

Is there any doubt that C7's run in decent air at a well prepped track will be trapping well over 120 mph? I am guessing 121-122 for a 7-speed car and 119-120 for an automatic in great air.
S.

EvanZR1

Fixed the graphs, the original links are now the updated with BOTH showing SAE.