Here's the plan//what am I missing?
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
Here's the plan//what am I missing?
Car is an '08 mn6 speed coupe (LS3). I have LG motorsports pro long tubes with their plumbing to connect to stock mufflers (no cats) on the way. I can't stand the noise and don't want to pay to have a louder car. A few HP wasted is OK in lieu of a loud car. Planning to add comp cams 236/242 .600 115LSA cam and kit. Callaway Honker, 4.10 gears, and a tune. I won't beat on it too much and am hoping stock clutch can stand the strain. Will it? Don't want to touch the heads and hope to eventually add a blower (cam is blower friendly). What am I missing?
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
Kind of skeered to hook it up too tight. It will see a little strip time, but I hate to hook it too well and end up buying a bunch of driveline parts. Hope I can get away with keeping it stock from the flywheel back. Is that possible with my setup?
Pro
Joined: Mar 2006
Posts: 579
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I would definitely try it since your car has the same clutch as the ZO6. However, with your new power level and 4.10s that stock clutch may be on borrowed time. If you ever add the blower you will almost certainly need to upgrade the clutch right then.
Drifting
Joined: Feb 2007
Posts: 1,844
Likes: 12
From: Alpharetta Georgia
I have a cam'ed LS3 w/ all bolt ons at 477whp/437wtq. I have no d/t issues at all. That clutch is good for 445whp/420wtq Z's and many of them do bolt on's/tunes/cams that put them @ 500whp+ still on the stock clutch. You will be fine.
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
You say noise is an issue. Don't you think, even with the stock mufflers, no cats will be loud? Try it out I'd say, but leave room in your budget for some cats, maybe.
How about the rear shafts when you go to supercharging?
How about the rear shafts when you go to supercharging?
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
Wouldn't the 4.10's be easier on the drivetrain vs the 3.42's? Maybe I'm looking at things backwards.........been accused of that before. Wasn't aware that the LS3 clutch was the same as the Z06. Takes very little leg effort to engage/disengage. Feels just like the clutch in one of my V6 powered farm trucks. That whole dang car is too smooth/easy/quiet/docile/mildmannered to run as good as it does.
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
It won't cost anything to try the stock mufflers. The LG pipes will bolt directly to the stock mufflers. I'm thinking they'll be a little loud when my foot's in it, but will quiet down nicely when I set the cruise. That's the way I think all exhausts ought to be. To me, there's nothing more aggrivating than an exhaust that never shuts up.
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Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
Is there a smell from not running cats? I've heard the smell comes from a tune that isn't quite right. If the tune is right, there should be little if any smell. Wrong/Right maybe?
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
Cam kit comes with new springs and pushrods. Tell me about the need for oil pump porting, new timing chain, and pinning the crank. I wouldn't think the extra "load" on the crank pulley would be that great. An occasional trip slightly north of 6500rpm, but the car won't spend a lot of time spinning that fast. The crank is pinned on my Radix blown truck, but the power needed to turn the supercharger necessitates that. It's not that tough of a job to do....I'll do it if necessary. Just never heard of pinning the crank on an N/A motor.
Safety Car
Joined: Nov 2007
Posts: 4,537
Likes: 1,403
From: Bethesda MD
A good tune does get most of it, but not all. Since keeping noise down was a criteria, cats do it and are benefical from a smell/environmental basis. They also only cost a couple HP in the process.
Pro
Joined: May 2000
Posts: 610
Likes: 1
From: Midland Texas
St. Jude Donor '09-'11
You can add the cats later, but I installed our LG longtubes with the cats to start with and with the stock mufflers. It was too quiet. I then put a Magnaflow exhaust on after the LG pipes and then added some short bullets just ahead of the axles to knock out a little drone at 1500. With a cam, this setup would be perfect. Noise level is perfect for me and we take a lot of trips in this car--to the track.
Without cats, it won't smell as much as a stock 1967 big block car but it will be more smell than with the cats. If you put the car up in the garage then walk out in to the garage 30 minutes later, the garage will smell enough that you will know the car doesn't have cats.
I leave the cats on anything that is street driven, especially convertibles.
Joe
Without cats, it won't smell as much as a stock 1967 big block car but it will be more smell than with the cats. If you put the car up in the garage then walk out in to the garage 30 minutes later, the garage will smell enough that you will know the car doesn't have cats.
I leave the cats on anything that is street driven, especially convertibles.
Joe
Last edited by Joe Lynch; Jul 12, 2008 at 07:33 AM.
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
I had a set of magnaflows with stock cats on my '95 vette that were the absolute worst. Didn't sound real strong at WOT and droned when you set the cruise. Hated them. Had a single corsa muffler on my supercharged truck. It had long tubes, nice cam, and no cats. Loved it. Sounded strong when accelerating and shut the freak up when cruising. I'd go the Corsa route on the new vette, but I think the money can be better spent elsewhere. Gold isn't as expensive per pound as a Corsa exhaust system. I can always add different muffs later. The LG pipes are supposed to bolt up to the stock mufflers. It won't cost anything to try the stockers.
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 6,999
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From: Southeast TX
[QUOTE=carlrx7;1566283925]thats alot of overlap for a blower friendly cam!!
I'm not completely sold on the cam. It bigger than what I thought I needed . My 6.0L truck has low 220's and .580 lift on a 115LSA. It's pretty tame. When I questioned the guy that made the recommendation, he said the extra cubes of the LS3, the manual tranny, the 4.10 gears, and the lightweight car would all tame down his recommended cam somewhat. I'd like to have plenty of camshaft, but don't want to have too many drivability issues. I'm open to suggestion/discussion on the camshaft. It's not chiseled in stone.
I'm not completely sold on the cam. It bigger than what I thought I needed . My 6.0L truck has low 220's and .580 lift on a 115LSA. It's pretty tame. When I questioned the guy that made the recommendation, he said the extra cubes of the LS3, the manual tranny, the 4.10 gears, and the lightweight car would all tame down his recommended cam somewhat. I'd like to have plenty of camshaft, but don't want to have too many drivability issues. I'm open to suggestion/discussion on the camshaft. It's not chiseled in stone.
Last edited by old motorhead; Jul 13, 2008 at 12:22 PM.
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
Cam?
I'm thinking that choosing a cam based on possible future mods may be a mistake. May or may not add the blower. What would your cam reccomendations be for an N/A LS3 with 6sp mn, 4.10 gears, cold air intake, long tube headers, and a turne? Don't want to kill the fuel eco and drivability, but want a strong running car. Car runs strong now, but I can't help but believe there's another 100+ hp to be had. Help greatly appreciated!