LS6 F-Body Engine Swaps: Post Mods & Dyno #'s
09-14-2011, 11:46 PM
#61
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A ls6 should run fine on the stock pump. Is your ls6 a 01(385hp) or 02(405hp)?
Just as a point of reference. Mine made 399rwhp first pull on the dyno still with ls1 tune but with rev limit bumped up. That with mac headers and ory, udp, ported tb, airlid, granetelli mass air, stock slp catback.
Just as a point of reference. Mine made 399rwhp first pull on the dyno still with ls1 tune but with rev limit bumped up. That with mac headers and ory, udp, ported tb, airlid, granetelli mass air, stock slp catback.
Plan as of now is to fix the fuel and get a better catback. Then get it retuned when it comes out of storage next year and see if I got all the bugs worked out. The previous owner was not nice to this car and I am slowly getting it back to its proper glory.
09-15-2011, 08:16 AM
#62
Heavy 18" wheels can MURDER dyno numbers.
I had a CTS-V yesterday (05) with a small cam (226_232ish on 113 LSA), long tubes, OR pipes, and CAI on the dyno. After many sessions fighting heavy false knock, the car finally made 402rwhp and 376tq. That's absolutely all there was to get out of this setup, at least on our dynojet.
I had a CTS-V yesterday (05) with a small cam (226_232ish on 113 LSA), long tubes, OR pipes, and CAI on the dyno. After many sessions fighting heavy false knock, the car finally made 402rwhp and 376tq. That's absolutely all there was to get out of this setup, at least on our dynojet.
12-30-2011, 08:37 PM
#64
I got mine tuned
LS1 shortblock, stock crank, rods with ARP rod bolts, Mahle forged pistons.
Top end off a 2003 Z06
Pacesetter headers and Y pipe, stock catback
Lid
Free mods
375/370 with 180 miles on it,M6 with a 3.42 gear, 17x9 Zr1 wheels.
Ran 114.9 MPH in 65* 100% humid air in a 3800lb car.
LS1 shortblock, stock crank, rods with ARP rod bolts, Mahle forged pistons.
Top end off a 2003 Z06
Pacesetter headers and Y pipe, stock catback
Lid
Free mods
375/370 with 180 miles on it,M6 with a 3.42 gear, 17x9 Zr1 wheels.
Ran 114.9 MPH in 65* 100% humid air in a 3800lb car.
01-05-2013, 05:28 PM
#65
Bringing this thread back from the dead...I'm the OP anyway, so I can do that, right 
I did eventually get back to the dyno after I added the pulley/thermostat/CAI as I mentioned in the original post and I actually was dead on with my guess. I now put down 385 RWHP. That last 15 RWHP to get me over the 400 RWHP has been bugging me a lot lately, so I've decided to see if I can get there without going through the trouble of a cam swap. Now that the FAST 92mm has been re-released, I just picked one up as well as a Nick Williams 92MM throttle body. I'm not sure that's going to be enough to get me to 400... I started thinking about maybe roller rockers. I know the stock 1.7's won't help much, but has anyone tried the 1.8's on an otherwise stock internal LS6? What kind of results did that net?
I did eventually get back to the dyno after I added the pulley/thermostat/CAI as I mentioned in the original post and I actually was dead on with my guess. I now put down 385 RWHP. That last 15 RWHP to get me over the 400 RWHP has been bugging me a lot lately, so I've decided to see if I can get there without going through the trouble of a cam swap. Now that the FAST 92mm has been re-released, I just picked one up as well as a Nick Williams 92MM throttle body. I'm not sure that's going to be enough to get me to 400... I started thinking about maybe roller rockers. I know the stock 1.7's won't help much, but has anyone tried the 1.8's on an otherwise stock internal LS6? What kind of results did that net?
01-05-2013, 06:30 PM
#66
Bringing this thread back from the dead...I'm the OP anyway, so I can do that, right
I did eventually get back to the dyno after I added the pulley/thermostat/CAI as I mentioned in the original post and I actually was dead on with my guess. I now put down 385 RWHP. That last 15 RWHP to get me over the 400 RWHP has been bugging me a lot lately, so I've decided to see if I can get there without going through the trouble of a cam swap. Now that the FAST 92mm has been re-released, I just picked one up as well as a Nick Williams 92MM throttle body. I'm not sure that's going to be enough to get me to 400... I started thinking about maybe roller rockers. I know the stock 1.7's won't help much, but has anyone tried the 1.8's on an otherwise stock internal LS6? What kind of results did that net?
I did eventually get back to the dyno after I added the pulley/thermostat/CAI as I mentioned in the original post and I actually was dead on with my guess. I now put down 385 RWHP. That last 15 RWHP to get me over the 400 RWHP has been bugging me a lot lately, so I've decided to see if I can get there without going through the trouble of a cam swap. Now that the FAST 92mm has been re-released, I just picked one up as well as a Nick Williams 92MM throttle body. I'm not sure that's going to be enough to get me to 400... I started thinking about maybe roller rockers. I know the stock 1.7's won't help much, but has anyone tried the 1.8's on an otherwise stock internal LS6? What kind of results did that net?
Mine is now at 385rwhp with a SLP 2OTL and shimming the lower airbox.
Stock thermostat, no pulley, through full exhaust.
I think a FAST is worth around 10-12 rwhp over a LS6, that should get you close.
01-05-2013, 07:41 PM
#67
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Bringing this thread back from the dead...I'm the OP anyway, so I can do that, right
I did eventually get back to the dyno after I added the pulley/thermostat/CAI as I mentioned in the original post and I actually was dead on with my guess. I now put down 385 RWHP. That last 15 RWHP to get me over the 400 RWHP has been bugging me a lot lately, so I've decided to see if I can get there without going through the trouble of a cam swap. Now that the FAST 92mm has been re-released, I just picked one up as well as a Nick Williams 92MM throttle body. I'm not sure that's going to be enough to get me to 400... I started thinking about maybe roller rockers. I know the stock 1.7's won't help much, but has anyone tried the 1.8's on an otherwise stock internal LS6? What kind of results did that net?
I did eventually get back to the dyno after I added the pulley/thermostat/CAI as I mentioned in the original post and I actually was dead on with my guess. I now put down 385 RWHP. That last 15 RWHP to get me over the 400 RWHP has been bugging me a lot lately, so I've decided to see if I can get there without going through the trouble of a cam swap. Now that the FAST 92mm has been re-released, I just picked one up as well as a Nick Williams 92MM throttle body. I'm not sure that's going to be enough to get me to 400... I started thinking about maybe roller rockers. I know the stock 1.7's won't help much, but has anyone tried the 1.8's on an otherwise stock internal LS6? What kind of results did that net?
What exhaust are you running? What mass air? Where is your timing at? What injectors? What wheels/tires?
My #'s would be about 431 whp / 408 wtq on a dynojet for a bolt-on ls6.
Last edited by HioSSilver; 01-05-2013 at 07:47 PM.
01-05-2013, 07:48 PM
#68
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Heavy 18" wheels can MURDER dyno numbers.
I had a CTS-V yesterday (05) with a small cam (226_232ish on 113 LSA), long tubes, OR pipes, and CAI on the dyno. After many sessions fighting heavy false knock, the car finally made 402rwhp and 376tq. That's absolutely all there was to get out of this setup, at least on our dynojet.
I had a CTS-V yesterday (05) with a small cam (226_232ish on 113 LSA), long tubes, OR pipes, and CAI on the dyno. After many sessions fighting heavy false knock, the car finally made 402rwhp and 376tq. That's absolutely all there was to get out of this setup, at least on our dynojet.
01-06-2013, 04:35 PM
#69
-Stock MAF w/aftermarked ported ends
-Timing - No idea...Vengeance Racing did my dynotune several years ago...
-Stock '98 LS1 injectors which are actually the same size as the stock '02-'04 LS6 injectors if memory serves...28 Lb?
-18x9.5 C5 Z06 replica rims w/275/35/18 tires. Yes, a heavy 50 Lbs. per wheel/tire. My originaly dyontune were on 17x9.5 C5 Z06 replicas, but when I went to re-dyno to get the 385 RWHP, I was on the 18's by then...
01-11-2013, 09:33 PM
#71
Anyway, I'm running Hooker shorty headers through the stock Y-pipe (w/stock cats) and then on to the SLP 2OTL. I had a BAD experience with a set of LT headers and wanted to stay conservative on the new (at the time) motor.
Original LS1 put down 304.2 RWHP and my best time with it was a 13.4 @ 106. LS6 currently puts down 385 RWHP and my best time with it so far is a 12.6 @ 112...however, that's with a badly slipping clutch. I thought a new LS6 clutch would be the perfect match for my LS6, but I was wrong...it overheats frequently at the track and won't let me shift at times. A new Monster stage II clutch is already ordered!
01-15-2013, 12:23 PM
#72
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Those shorty's and y are killing you. You need some 1 7/8's Kooks, even if you get the catted y you will notice a huge difference. Be sure to cut the neck down off the y and make a straight peice to connect you cat back. That neck down kills them too. You have alot of room to move on that thing. You should be running high 11's or better with some changes. Get rid of those heavy wheels too. Get a udp and a aluminum flywheel. A fast intake will put 10-15 whp in it. I don't know where your limiter is but it should be @ 6800-7000. Mines at 7000. Don't be scared to turn it.
01-29-2013, 02:18 PM
#76
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Those shorty's and y are killing you. You need some 1 7/8's Kooks, even if you get the catted y you will notice a huge difference. Be sure to cut the neck down off the y and make a straight peice to connect you cat back. That neck down kills them too. You have alot of room to move on that thing. You should be running high 11's or better with some changes. Get rid of those heavy wheels too. Get a udp and a aluminum flywheel. A fast intake will put 10-15 whp in it. I don't know where your limiter is but it should be @ 6800-7000. Mines at 7000. Don't be scared to turn it.
Tell us a little more about cutting the neck off the y-pipe?
01-30-2013, 09:43 PM
#77
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I have cut my y pipes where they come together and put a bigger piece of pipe on it to match the cat-back. That gets rid of that little neck down where the y slides into the cat back. Those little things count.
01-31-2013, 10:18 AM
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Someone did it, he had good results but I forget what they were.
I have cut my y pipes where they come together and put a bigger piece of pipe on it to match the cat-back. That gets rid of that little neck down where the y slides into the cat back. Those little things count.
I have cut my y pipes where they come together and put a bigger piece of pipe on it to match the cat-back. That gets rid of that little neck down where the y slides into the cat back. Those little things count.
01-31-2013, 10:53 AM
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Now in my case i have kooks and their 3" y. It feed into a 3" pipe but i made my own catback to be 3.5". I cut the 3" part off my y and morphed a 3.5" onto it.
01-31-2013, 11:16 AM
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I have the Kooks 3" Y with a 3" Magnaflow cat back. And wanted to a nice merge collector like Pat-G did a few years back. That is REALLY susposed to help?