Dual Exhaust?
#18
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Originally Posted by Maximus330
LOL, I didn't know we had an exhaust note ![Big Grin](https://www.clublexus.com/forums/images/smilies/biggrin.gif)
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(I actually like the IS350's note, muted as it is - I think with a little work it will be really nice)
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Anyone notice that on at least the IS350 that the exhaust shakes? I was driving a IS350 and I noticed that the exhausts shakes as if its not bolted on tight enough.
#21
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Look at that Transmission drain plug. That's good to see.
Timbois, do you know where the oil filter is?
I wonder if it is a cartridge or spin on? You all know?
We need to start a motor thread. Its listed aluminum motor, It must have iron or
some magnesium sleeves for the cylinders for longevity. You all know?
Timbois, do you know where the oil filter is?
I wonder if it is a cartridge or spin on? You all know?
We need to start a motor thread. Its listed aluminum motor, It must have iron or
some magnesium sleeves for the cylinders for longevity. You all know?
#22
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Originally Posted by Indecisive
Anyone notice that on at least the IS350 that the exhaust shakes? I was driving a IS350 and I noticed that the exhausts shakes as if its not bolted on tight enough.
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Originally Posted by IS350S
How the hell you look at your exhaust while your driving?
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Can anybody reference their manual and find out if those two bulges right in the middle of the exhaust are resonators or are they catalytic convertors? If they're cats, that's a whole lot of extra restriction along with where the exhaust pipes mingle after them...
I think there is some good HP to be freed up in this exhaust while still keeping emissions clean: Aftermarket equal length headers, high flow cats for the first set of cats, eliminate the 2nd set of cats at the middle (if they really ARE cats), have an "H" pipe to synch up the exhaust pulses before the current 2nd cat location, then keep the exhaust true dual all the way out without merging the pipes. It would definitely sound more aggressive but shouldn't be obnoxiously loud, and all of the above ought to be good for 10-20 WHP...maybe more...who knows?
I think there is some good HP to be freed up in this exhaust while still keeping emissions clean: Aftermarket equal length headers, high flow cats for the first set of cats, eliminate the 2nd set of cats at the middle (if they really ARE cats), have an "H" pipe to synch up the exhaust pulses before the current 2nd cat location, then keep the exhaust true dual all the way out without merging the pipes. It would definitely sound more aggressive but shouldn't be obnoxiously loud, and all of the above ought to be good for 10-20 WHP...maybe more...who knows?
Originally Posted by TimboIS
Here's a picture.
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Originally Posted by TheKos
Can anybody reference their manual and find out if those two bulges right in the middle of the exhaust are resonators or are they catalytic convertors? If they're cats, that's a whole lot of extra restriction along with where the exhaust pipes mingle after them...
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Yea, I think they are resonators the more I compare them to the end of the cats that are visible up top.
I'd love to see the kind of exhaust I posted above, but my plan for when I buy an IS next year is to leave it pretty much stock and mod another car that won't be a daily driver. Now I just have to make myself stick to my plan.
I'd love to see the kind of exhaust I posted above, but my plan for when I buy an IS next year is to leave it pretty much stock and mod another car that won't be a daily driver. Now I just have to make myself stick to my plan.
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#28
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Originally Posted by Maximus350
Thanks again MR LEX. I wonder what kind of hp gain we can expect?
before the "butt dyno" gains happen, do a baseline dyno with the car, and a post-exhaust dyno.
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Thanks for those pics, wolverine.
It looks like that first "Y" section is the most restrictive part of the exhaust. It also looks like there's enough room to go true dual all the way back, though. Just cut after the dual resonators, add some custom bent tubes back to a pair of high flow mufflers, then put an "H" pipe before the resonators and the exhaust side is set until the aftermarket comes out with high flow cats and equal length headers.
It looks like that first "Y" section is the most restrictive part of the exhaust. It also looks like there's enough room to go true dual all the way back, though. Just cut after the dual resonators, add some custom bent tubes back to a pair of high flow mufflers, then put an "H" pipe before the resonators and the exhaust side is set until the aftermarket comes out with high flow cats and equal length headers.
#30
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Originally Posted by TheKos
Thanks for those pics, wolverine.
It looks like that first "Y" section is the most restrictive part of the exhaust. It also looks like there's enough room to go true dual all the way back, though. Just cut after the dual resonators, add some custom bent tubes back to a pair of high flow mufflers, then put an "H" pipe before the resonators and the exhaust side is set until the aftermarket comes out with high flow cats and equal length headers.
It looks like that first "Y" section is the most restrictive part of the exhaust. It also looks like there's enough room to go true dual all the way back, though. Just cut after the dual resonators, add some custom bent tubes back to a pair of high flow mufflers, then put an "H" pipe before the resonators and the exhaust side is set until the aftermarket comes out with high flow cats and equal length headers.
and it'll be important to look not just at peak hp gain, but overall gain or loss underneath the power curve in its entirety.