cam chops harder cold
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Launching!
Joined: Dec 2014
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From: Florida
cam chops harder cold when i first start the car the car chops hard and sounds good. when it heats up it starts to have an idle that i almost couldent tell if it was cammed. no cam specs
but id like to see if anyone knows whats going on. ive been blaming it on my muffler but i dont really think thats it. its a 418 ls3
but id like to see if anyone knows whats going on. ive been blaming it on my muffler but i dont really think thats it. its a 418 ls3 Lots of variables, and yes mufflers is one of them. A cold exhaust is going to sound much louder then when it's warmed up. Fueling, engine temp all play a factor in how hard an engine will "chop".
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Launching!
Joined: Dec 2014
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From: Florida
this is in an fbody btw. i have a magnaflow cat back and from what i understand this catback has very quiet at idle. i was just thinking that maybe it was why. my car idles around 700 or so, maybe since it a kinda low idle and the rather quiet cat back muffles the sound out. any one else have a cam and this catback?
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Exactly mostly comes down to the fueling when cold. When cold you're in open loop so the fuel is different than when it enters closed loop warm. the other part is just parts heating up and the engine smoothing out warm. if you want it to lobe more warm then lower the idle speed and or timing. but you can only go so far
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Launching!
Joined: Dec 2014
Posts: 214
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From: Florida
Exactly mostly comes down to the fueling when cold. When cold you're in open loop so the fuel is different than when it enters closed loop warm. the other part is just parts heating up and the engine smoothing out warm. if you want it to lobe more warm then lower the idle speed and or timing. but you can only go so far
Do you have cats on the car? That would help a ton if you have them and want it louder and more pronounced. That is if you have them. Check this out. Here's my car with and without cats.
Thread Starter
Launching!
Joined: Dec 2014
Posts: 214
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From: Florida
Do you have cats on the car? That would help a ton if you have them and want it louder and more pronounced. That is if you have them. Check this out. Here's my car with and without cats.
244/248 Hellion cam w pacesetter and ory - YouTube
First start up after NGK TR6 plugs - YouTube
244/248 Hellion cam w pacesetter and ory - YouTube
First start up after NGK TR6 plugs - YouTube
I would address the exhaust too. Here is mine. Heads/Cam/Full-Bolt-On WS6 with the Texas Speed true duals with their bullets. My idle is right around 700. Have your tuner drop the idle. 1000 is too high if you want more chop out of your cam. As far as cold and hot goes, the car is always going to have more of a lope to it when it's colder. No tuning is going to cause it to chop the same once it's been warmed up. Many people have addressed why above.
Even my truck hits harder cold. Every cammed ls car I've ever been around chopped harded at idle than once it's warmed up. Couldn't tell you why but there is certainly nothing wrong with your car.
No one is getting a cammed m6 to idle at 700 the dash tach as stated is not accurate. Stock m6 idle is 800 and no one really goes lower because it will become erratic. Op there is no cut and dry answer you may be able to drop down to 800 or only 900 or maybe not at all its a trial and error thing. You can also run more timing and drop the rpm or less timing and more rpm etc, leaning the idle out will cause a smoother idle whereas a rich idle will make it pop more... theres just too many variables to give an accurate answer
Thread Starter
Launching!
Joined: Dec 2014
Posts: 214
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From: Florida
I would address the exhaust too. Here is mine. Heads/Cam/Full-Bolt-On WS6 with the Texas Speed true duals with their bullets. My idle is right around 700. Have your tuner drop the idle. 1000 is too high if you want more chop out of your cam. As far as cold and hot goes, the car is always going to have more of a lope to it when it's colder. No tuning is going to cause it to chop the same once it's been warmed up. Many people have addressed why above.
"The Mongoose" 2002 Trans Am WS6 - YouTube
"The Mongoose" 2002 Trans Am WS6 - YouTube
On your set up, combine no cats and a free flowing exhaust like True Duals and you'd gain more than you think. .
Having cats and Magnaflow aren't helping. If you can ditch the cats and go with bullet type mufflers/resonators, that will help a ton. Magnaflows are really quiet. They sound good at WOT, but way too quiet for my liking.
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Launching!
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From: Florida
Yeah. I feel the the magnaflow , the 3 inch y pipe and the magnaflow are holding me back. The last time it was dynoed with this exhaust set up it made numbers i wasent pleased with but it was also a stingy mustang dyno. Im pretty sure with having 400+ cubes the motor needs everything to flow as great as possible to get max power. The magnaflow is to quiet for my taste so i will be ditching this entire y pipe setup for some sort of catless true duals i also think my tunes a little fat so im going to have a retune when i have the chance