Low torque numbers
Thread Starter
Racer
Joined: May 2006
Posts: 431
Likes: 0
From: Houston TX
Low torque numbers
My buddies C5 w/ prc ported LS6 heads, MS3 237/242 114 lsa, FAST 90, LS2 90mm TB, LG Street headers and tune did 440rwhp 382lbs-ft tq through the stock clutch setup. Why is the torque so low and how could he get the TQ higher???
Racer
Joined: Jul 2008
Posts: 264
Likes: 0
From: Spring Tx
I have:
g5x3 (rumored to be 236 / 242 or close to that)
cold air intake
lg street headers, ghl bullets
stock heads, intake, throttle body, etc.
435.7 & 405.7 (thanks to england green tune)
I don't want to start a war, but the first thing i would look at if that were my car is the cylinder heads and who ported them. That stuff is an art/science and there are only a couple of heads i would consider and only a couple people I would let change the port work.
Also the tune. My old tuner had it at around 426/386, EG managed to up those numbers a bit.
Also, if he has 410 gears or something like that, he will show different dyno numbers.
g5x3 (rumored to be 236 / 242 or close to that)
cold air intake
lg street headers, ghl bullets
stock heads, intake, throttle body, etc.
435.7 & 405.7 (thanks to england green tune)
I don't want to start a war, but the first thing i would look at if that were my car is the cylinder heads and who ported them. That stuff is an art/science and there are only a couple of heads i would consider and only a couple people I would let change the port work.
Also the tune. My old tuner had it at around 426/386, EG managed to up those numbers a bit.
Also, if he has 410 gears or something like that, he will show different dyno numbers.
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
I have 224/224 581/581 112+4
407 rwhp and 405 rwtq
400 lb feet at 3000 rpms
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
Comp Cam XE-R lobe
normally come with a 114+2 had them do the 112+4
If I do it again, which most likely will I will do a 224/230 581/588 112+4
for more high end HP
http://www.compcams.com/Cam_Specs/Ca...csid=1092&sb=2
Possibly this one, but not sure on the low end torque
http://www.compcams.com/Cam_Specs/Ca...csid=1093&sb=2
other goodies
LS6 intake polished not ported
TPIS 78mm TB pp
my own CAI
TPIS LTs, high flow cats then straight pipes.
3qt accu-sum and oil cooler
normally come with a 114+2 had them do the 112+4
If I do it again, which most likely will I will do a 224/230 581/588 112+4
for more high end HP
http://www.compcams.com/Cam_Specs/Ca...csid=1092&sb=2
Possibly this one, but not sure on the low end torque
http://www.compcams.com/Cam_Specs/Ca...csid=1093&sb=2
other goodies
LS6 intake polished not ported
TPIS 78mm TB pp
my own CAI
TPIS LTs, high flow cats then straight pipes.
3qt accu-sum and oil cooler
Last edited by AU N EGL; Oct 27, 2009 at 01:15 PM.
Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
Can you post a dyno graph up?
There are a couple possibilities.
1. If the car spun the tires on the dyno you would see a spike in HP and a dip in torque this could be part of that.
2. Head to cam match up
3. Cam might be off as well. If it is either advanced or retarded a couple degrees that can throw this off as well.
There are a couple possibilities.
1. If the car spun the tires on the dyno you would see a spike in HP and a dip in torque this could be part of that.
2. Head to cam match up
3. Cam might be off as well. If it is either advanced or retarded a couple degrees that can throw this off as well.
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Thread Starter
Racer
Joined: May 2006
Posts: 431
Likes: 0
From: Houston TX
Can you post a dyno graph up?
There are a couple possibilities.
1. If the car spun the tires on the dyno you would see a spike in HP and a dip in torque this could be part of that.
2. Head to cam match up
3. Cam might be off as well. If it is either advanced or retarded a couple degrees that can throw this off as well.
There are a couple possibilities.
1. If the car spun the tires on the dyno you would see a spike in HP and a dip in torque this could be part of that.
2. Head to cam match up
3. Cam might be off as well. If it is either advanced or retarded a couple degrees that can throw this off as well.
Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
Tech Contributor
Joined: Oct 1999
Posts: 40,995
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From: Charlotte, NC (formerly Endicott, NY)
http://forums.corvetteforum.com/help...al-inside.html
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Bill
Safety Car
Joined: Oct 2007
Posts: 3,903
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From: You know your drunk when you swerve to miss the tree then you realize its your air freshener! Covington Ga
I have the same cam in mine but stock heads (241) and stock LS6 intake manifold and protted TB 412RWHP and I think 366RWTQ. I think you need a re-tune.
Thread Starter
Racer
Joined: May 2006
Posts: 431
Likes: 0
From: Houston TX
Thread Starter
Racer
Joined: May 2006
Posts: 431
Likes: 0
From: Houston TX
When I just had LTs (LG streets), CAI (V-ram) and tune on my '02 C5 w/stock 241heads, stock LS6 intake and stock LS1 cam, I made 351rwhp and 365rwtq. Your torque numbers are low too w/ the MS3. I spoke with Patrick G from Thunder Racing and he said that the MS3 loves high compression. 10:5 comp ratio is too low for this cam and it has a horrible DCR. He said it's an RPM cam and not suited for torque and that it was extremely weak in the low/mid range.
Last edited by 11sec_C5Z51; Oct 28, 2009 at 09:48 AM.
Drifting
Joined: Jun 2007
Posts: 1,437
Likes: 5
Can you post a dyno graph up?
There are a couple possibilities.
1. If the car spun the tires on the dyno you would see a spike in HP and a dip in torque this could be part of that.
2. Head to cam match up
3. Cam might be off as well. If it is either advanced or retarded a couple degrees that can throw this off as well.
There are a couple possibilities.
1. If the car spun the tires on the dyno you would see a spike in HP and a dip in torque this could be part of that.
2. Head to cam match up
3. Cam might be off as well. If it is either advanced or retarded a couple degrees that can throw this off as well.
Thanks
Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
Of course this is all going to play with how the cam is setup and your over all combo.
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
Advancing or retarding the camshaft can move the power band around. If you retard the cam it should move the power band up in the RPM range, conversely retarding it would move it back down.
Of course this is all going to play with how the cam is setup and your over all combo.
Of course this is all going to play with how the cam is setup and your over all combo.
Team Owner
Joined: May 2003
Posts: 23,480
Likes: 9
From: East Meadow NY
St. Jude Donor '12
Its an MN6 so there isn't a torque converter issue. A stingy dyno would report everything low. The HP is computed based on the TQ, so everything would be low. Now, if the HP was low too, the dyno could be considered stingy, but that is a pretty big spread between HP and TQ.
Drifting
Joined: Jun 2007
Posts: 1,437
Likes: 5
Its an MN6 so there isn't a torque converter issue. A stingy dyno would report everything low. The HP is computed based on the TQ, so everything would be low. Now, if the HP was low too, the dyno could be considered stingy, but that is a pretty big spread between HP and TQ.