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  #41  
Old 03-25-2015, 12:51 PM
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My f1 made the rattle once in a while on shutdown. It apparently got a new clutch right before I got it from a dealer so I didn't worry about it. The 95 doesn't make the rattle. Apparently it also had the flywheel serviced so maybe re greased. In any case remove the two 10 mm bolts on the bottom pumpkin and have a look in there.

The 2.7 idle for me smoothed out completely when I ddisconnect both 02 sensors and started her up... Dave helms says it's a characteristic of the two separate bank setup. Mine has the same hop ...burble at idle on occasion. It runs perfect so I just accept it as normal.
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  #42  
Old 04-01-2015, 02:15 AM
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Dual mass flywheels tend to rattle.
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  #43  
Old 08-12-2017, 07:35 PM
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Figured I would just add this here.

Made some cat delete pipes today. Nothing really exciting but I was interested to try them to see the difference in sound and engine compartment heat.
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  #44  
Old 08-12-2017, 07:50 PM
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  #45  
Old 08-13-2017, 10:09 AM
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Lmao, thanks Dave
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  #46  
Old 08-13-2017, 12:48 PM
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Love the custom look! Very curious to know your thoughts on the differences in sound.
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  #47  
Old 08-14-2017, 08:38 AM
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Thanks Ken.

The difference in sound is......not much at all. Thought it would be a big difference and maybe it would be compared to stock cats.

Compared to the metallic cats I had on there, maybe 5% louder?

I was in a rush when I got home so didn't even open the engine lid to see if temps seemed any different. (though I suspect that won't be a huge difference either)
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  #48  
Old 08-14-2017, 05:56 PM
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Quote:
Originally Posted by INTMD8 View Post
... didn't even open the engine lid to see if temps seemed any different. (though I suspect that won't be a huge difference either)
I would think you would have a decent reduction in temperature but if you don't do a "proper" measurement before and after it will be hard to tell. Then again the catastrophic converters probably have some some heat shielding and the test pipes don't. In any event, you'll definitely be on the winning side (lower temps) with test pipes if your car starts running rich for some reason.
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  #49  
Old 08-14-2017, 08:12 PM
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Originally Posted by eulk328 View Post
I would think you would have a decent reduction in temperature but if you don't do a "proper" measurement before and after it will be hard to tell. Then again the catastrophic converters probably have some some heat shielding and the test pipes don't. In any event, you'll definitely be on the winning side (lower temps) with test pipes if your car starts running rich for some reason.
Agreed! Just curious to see if it will -seem- like less of an inferno but no, I didn't take any measurements.

No heat shielding on the converters.
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  #50  
Old 08-15-2017, 07:18 AM
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Quote:
Originally Posted by INTMD8 View Post
Thanks Ken.

The difference in sound is......not much at all. Thought it would be a big difference and maybe it would be compared to stock cats.

Compared to the metallic cats I had on there, maybe 5% louder?

I was in a rush when I got home so didn't even open the engine lid to see if temps seemed any different. (though I suspect that won't be a huge difference either)
were you running your custom ypipe before putting in the test pipes..?

if I recall you had the ypipe in with the high flow cats..

so that's why maybe you feel not much difference in sound..
meaning on bypass.. most of the volume/pitch was produced from the y-pipe and you were already getting improved lower rpm/idle sound with the hyflow cats..

now with the test pipes.. there is not much change..
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  #51  
Old 08-15-2017, 08:42 AM
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Originally Posted by Drock28 View Post
were you running your custom ypipe before putting in the test pipes..?

if I recall you had the ypipe in with the high flow cats..

so that's why maybe you feel not much difference in sound..
meaning on bypass.. most of the volume/pitch was produced from the y-pipe and you were already getting improved lower rpm/idle sound with the hyflow cats..

now with the test pipes.. there is not much change..
^Yes, all correct. I was thinking it would be a bit louder with the bypass closed but not much difference vs the high flow cats.
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  #52  
Old 08-15-2017, 10:47 AM
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I recall someone here briefly and oddly mentioning hollowed out stock cats have a different tone vs a simple strait pipe. It got me wondering for a bit. My car came with hollowed out stock cats. I still have the oem y-pipe. With the bypass wired open and capristo 3, I felt the car sounded insane. High pitch in all range all the time. Not sure if there's any validity to the hollowed cats claim.
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  #53  
Old 08-15-2017, 12:04 PM
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Originally Posted by ShineKen View Post
I recall someone here briefly and oddly mentioning hollowed out stock cats have a different tone vs a simple strait pipe. It got me wondering for a bit. My car came with hollowed out stock cats. I still have the oem y-pipe. With the bypass wired open and capristo 3, I felt the car sounded insane. High pitch in all range all the time. Not sure if there's any validity to the hollowed cats claim.

indeed there is a difference in sound between a hollowed cat and a straight pipe.. ive ran both setups..

hollowed cat sounds nice.. better then functioning cat.. but because of the oval shape, it acts like a resonator, disrupting the flow of exhaust from header outlet to exhaust inlet ( smaller diameter, to bigger, to small again).

in my case.. at idle, little to no difference between empty cat and straight pipe. but at full throttle, sound difference was is very noticeable. crisp, more clean pitched sound..
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  #54  
Old 08-15-2017, 12:32 PM
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What size tube 2.5?
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  #55  
Old 08-15-2017, 01:21 PM
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What size tube 2.5?
It's 2.25 at the inlet (to slip over 2.125 header outlet).

Steps down to 2.125 at the outlet to accept v-band flanges for the muffler.
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  #56  
Old 08-15-2017, 02:48 PM
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Originally Posted by Drock28 View Post
indeed there is a difference in sound between a hollowed cat and a straight pipe.. ive ran both setups..

hollowed cat sounds nice.. better then functioning cat.. but because of the oval shape, it acts like a resonator, disrupting the flow of exhaust from header outlet to exhaust inlet ( smaller diameter, to bigger, to small again).

in my case.. at idle, little to no difference between empty cat and straight pipe. but at full throttle, sound difference was is very noticeable. crisp, more clean pitched sound..
Interesting! Thanks for the feedback. Just to be clear, are you saying you prefer the sound of a hollowed out cat vs. a straight pipe?
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  #57  
Old 08-15-2017, 04:00 PM
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I swapped my Tubi straight pipes for the OEM catalyst - they soon broke down and I punched them out. There is indeed a difference in sound between a test pipe and a hollowed out cat. The straight pipe is more crisp and raspy sounding. The hollowed out cats have a different sound and I think I would prefer the sound of cats on the car TBH. I didn't like having a decatted Y pipe for the same reason. It's more crisp but loses something.
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  #58  
Old 08-15-2017, 04:21 PM
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Originally Posted by ShineKen View Post
Interesting! Thanks for the feedback. Just to be clear, are you saying you prefer the sound of a hollowed out cat vs. a straight pipe?
sorry..

ive ran stock cats, hollowed hyperflow cats and test pipes..


I prefer the test pipe setup for sure..

only thing I haven't tested is a ypipe
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  #59  
Old 08-15-2017, 05:10 PM
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sorry..

ive ran stock cats, hollowed hyperflow cats and test pipes..


I prefer the test pipe setup for sure..

only thing I haven't tested is a ypipe
Ok. So I guess we're in agreement hollow cats = not good. Test Pipes = better.

I've got hollowed cats on the car and a pair of straight pipes in storage. Just wondering which one I should be using when the time comes.
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  #60  
Old 08-15-2017, 06:31 PM
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well if you have a set of test pipes handy already, I'd throw those on for sure.
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