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J-Man
Dodge Dakota
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3/02/2004
17:53:44
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 Subject: Exhaust effects on torque
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Message:
I hoping someone could explain to me how and why a very low back pressure echaust system has a negative effect on low end torque...
Also, I have heard quite a few people saying that their CAI sounds great. How exactly does the intake make any sound?
Thanks,
J-Man
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beeno
Dodge Dakota
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3/02/2004
20:34:58
| RE: Exhaust effects on torque
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Message:
I think Larry had a post on that once...
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GB2000
GenIII
3/02/2004
21:54:20
| RE: Exhaust effects on torque
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Message:
The stock intakes have a ribbed tube going into the throttle body. Some cold air intakes don't use that tube (which is designed to quiet the incoming air) and so when the engine is cold, it'll hiss while the IAC is open to help the engine warm up. It may also do that if you use a much better flowing filter. You also will notice your engine sounds different if you punch it when driving down the road and it hits the higher RPMs cuz you can hear the air being sucked in much better. My intake growls at WOT (wide open throttle) and also has a very noticeable hiss when my engine is cold...but I don't have a CAI. I got a 10" round air cleaner that sits right on top the tb. Prolly no performance gains since I don't have a ram air hood, but it looks cool:)
Josh
Red 98 RC V6 2wd Single in/dual out exhaust (soon to be switched to a flowmaster 40 single in/dual out), s-bolt "mod", Edelbrock 10" round air cleaner w/ K&N air filter, removed rubber flap...and more to come
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GB2000
GenIII
3/02/2004
21:57:22
| RE: Exhaust effects on torque
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Message:
Oh yeah...and my best info on the back pressure. Our trucks need so much back pressure in order to have the low end torque that they were designed to have. If you put a low back pressure system on it, it doesn't have the needed amount of back pressure and therefore loses torque. Sorry I can't describe it better.
Josh
Red 98 RC V6 2wd Single in/dual out exhaust (soon to be switched to a flowmaster 40 single in/dual out), s-bolt "mod", Edelbrock 10" round air cleaner w/ K&N air filter, removed rubber flap...and more to come
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J-Man
Dodge Dakota
JOIN HERE
3/03/2004
00:40:53
| RE: Exhaust effects on torque
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Message:
Thanks, that helps. I noticed that whistling sound you were talking about after I ported my TB and cleaned up my IAC. It was very loud at first, but after the comp adjusted it just sounds like rushing air now, but much quieter.
J-Man
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daffydak
GenIII
3/03/2004
00:46:17
| RE: Exhaust effects on torque
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Message:
i like the hissing sound. It sounds really cool if i turn the radio down and tap the pedal, makes a really loud hiss like a pop bottle being opened.
ditto on the exhaust i have herd that single outlet exhaust is best for our v6 (or single in dual out muffler) 2.5 inch pipes
Dan
mopar=mopower
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