2 dynos and where is....
Thread Starter
Race Director
Joined: Jan 2001
Posts: 11,183
Likes: 85
From: Castle Rock CO
St. Jude Donor '15
2 dynos and where is....
Well, I have seen two C6 rear wheel dyno graphs on this forum now from vendors I would trust with numbers. The horsepower number appears to be right on from GM for the LS2....However, the torque isn't there!!! I was one of the ones who was absolutely positive GM is underrating this motor and I have to say I am disappointed. Anyone want to take a stab at why the torque doesn't make the numbers, given the cam numbers, known head design and larger displacement? Anyone think GM has a much more intrusive torque managment program in the PCM doing the dirty work?
It will be interesting to watch the developments over the next several months from our forum vendors, of whom, LGM should have headers on one right now and graphs up soon.....
Todd
It will be interesting to watch the developments over the next several months from our forum vendors, of whom, LGM should have headers on one right now and graphs up soon.....
Todd
Intermediate
Joined: Jun 2004
Posts: 46
Likes: 0
From: LaPorte IN
I agree. The numbers I've seen so far are a fair bitl off the 02-04 Z06 numbers, in spite of the HP graphs GM released. The numbers seem to be in the same range as what the 385/385 01 Z06's make. However, these cars are still very low mileage and I'm sure they'll free up once broken in. Still though, I did expect to see more after seeing the now famous LS2 vs. LS6 dyno graph.
Instructor
Joined: Aug 2004
Posts: 128
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From: California
Originally Posted by WhiteDiamond
Well, I have seen two C6 rear wheel dyno graphs on this forum now from vendors I would trust with numbers. The horsepower number appears to be right on from GM for the LS2....However, the torque isn't there!!!
Todd
Todd
TIA
Thread Starter
Race Director
Joined: Jan 2001
Posts: 11,183
Likes: 85
From: Castle Rock CO
St. Jude Donor '15
Originally Posted by Johnny S
I agree. The numbers I've seen so far are a fair bitl off the 02-04 Z06 numbers, in spite of the HP graphs GM released. The numbers seem to be in the same range as what the 385/385 01 Z06's make. However, these cars are still very low mileage and I'm sure they'll free up once broken in. Still though, I did expect to see more after seeing the now famous LS2 vs. LS6 dyno graph.
DTE posted a dyno graph for a C6 a while back. It was low on torque as well.(using 15 to 17% loss, the torque is close, but less than 400 flywheel).
Oh, I want to add to that speculation that GM purposely is holding tuning back on the LS2 is very welcome. I believe that the new C6 should easily run with the last Z06, so maybe GM did this on purpose. Either way, our C6 is now at least 1 year down the road.
Todd
Le Mans Master
Joined: Jul 2004
Posts: 6,661
Likes: 1
I think that the engine is stopped up with a restrictive exhaust and has an overly conservative tune. They don't want to outclass the C5 Z06 after all.
I think that you'll see some great gains from headers, exhaust and a tune once someone can tune the LS2.
X
I think that you'll see some great gains from headers, exhaust and a tune once someone can tune the LS2.
X
Thread Starter
Race Director
Joined: Jan 2001
Posts: 11,183
Likes: 85
From: Castle Rock CO
St. Jude Donor '15
Originally Posted by xsiveone
I think that the engine is stopped up with a restrictive exhaust and has an overly conservative tune. They don't want to outclass the C5 Z06 after all.
I think that you'll see some great gains from headers, exhaust and a tune once someone can tune the LS2.
X
I think that you'll see some great gains from headers, exhaust and a tune once someone can tune the LS2.
X
It is nice to see a mod that was effective on the C5 as effective on the C6. We should see some nice power levels off of these first C6s by the end of the year.
Torque? Where is it??
Todd
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Brett Foote
Team Owner
Joined: Feb 1999
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From: Hades, eighth circle
Originally Posted by Popeye
Could you explain this for me. Not being a mechanic or engineer, I'm a bit ignorant on this. I thought horsepower was a calculated value (torque x rpm/5252). If the horsepower on the dyno is good, why isn't the torque?
TIA
TIA
If the C6 has a better horsepower curve than the C5 then it also has a better torque curve. You can't have one without the other.