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Old 06-17-2007, 01:36 PM   #1
cucamelsmd15
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Default Downpipe hitting trans. crossmember

Ok, Ive tried everything, including pushing the thing as far to the passenger side as I could get it, but it still knocks. Only happens under deceleration, as soon as I hit the gas, it goes away.

At this point, Im considering wrapping the pipe anyway, and the wrap should cushion it against banging the crossmember, right? Or would I be better off trying to do something else?
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Old 06-17-2007, 06:03 PM   #2
teiva-boy
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Sounds like you only need a 1/4"-1/2" of clearance to make it work... I would take a BFH to the crossmember if it's simply the edge of the cross member that is in the way... If it's more towards a solid piece of the crossmember, I would advise against that...

Now you may want to invest in Group-n engine mounts.. They are highly recommended for other things, but it may also help solve this issue as well.

This day in age, the pipes are pretty much massed produced, and I would think that manufacturing tolerances between units would be minimal at best.
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Old 06-17-2007, 06:16 PM   #3
cucamelsmd15
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Yeah, its the edge of the crossmember. Im thinking BFH to both, actually. That will give me all the clearance I need, I think.
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Old 06-17-2007, 10:48 PM   #4
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...e-bay downpipe? Had the same problems with an Alphawerks. After the fourth time under the car removing the da#% thing I finally got the BFH after it...no more noise. If the heat wrap rubs it will wear away rather quickly and the noise will be right back...trust me.
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Old 06-17-2007, 10:52 PM   #5
STIBungy
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What downpipe?
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Old 06-18-2007, 06:32 AM   #6
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Its a Megan.

Whats funny is a friend of mine has the same pipe, and it fit perfectly, it wasnt even close to touching the crossmember. Maybe I just got a Friday pipe or something...
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Old 06-18-2007, 06:28 PM   #7
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Quote:
Originally Posted by cucamelsmd15 View Post
Its a Megan.

Whats funny is a friend of mine has the same pipe, and it fit perfectly, it wasnt even close to touching the crossmember. Maybe I just got a Friday pipe or something...

Personally, I feel it's hit or miss with the cheap stuff. YMMV.
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Old 06-19-2007, 01:57 AM   #8
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My Perrin rotated downpipe hits but my friend's doesnt.
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Old 06-19-2007, 10:56 AM   #9
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My Helix DP hits a little too. I was thinking of wedging a small peice of radiator hosing between the pipe and tranny crossmember then securing it with bailing wire but I haven't had a chance to try it out.
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Old 06-19-2007, 12:58 PM   #10
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Thumbs up

I have the helix catted DP and had this same problem. I made a small notch on the crossmember (on the last 1/4" or so) and bent it up and then when I remounted the DP, I kept the turbo bolts/nuts loose, tightened the DP mounting bolt with it as far awat from the crossmember (using a prybar or extra set of hands helps) and then tighten the turbo to DP bolts/nuts! No more hitting even under hard downshifting!
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Old 06-19-2007, 06:04 PM   #11
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Quote:
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Personally, I feel it's hit or miss with the cheap stuff. YMMV.

Well, I guess I stand corrected, you guys with the good stuff seem to be having some problems too.
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Old 06-19-2007, 06:22 PM   #12
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Well I found out after I bought my DP that Helix is now the cheap stuff, or rather the super mass produced low QA stuff and that Titek is the new Helix. It is a quality looking DP and I am happy with it. The way I seeit, it is an aftermarket mod and sometimes you need to "customize" your ride to make it fit! My buddy has the Titek catted on his 06 TR and he had zero fitment issues!
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Old 06-19-2007, 11:12 PM   #13
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What really erks me is I have over 200 y pipe due tomorrow for a major domestic auto maker and I have 3.5mm tolerance overall. For someone to screw up a downpipe it would have to be inches off. Talk about poor quality control!
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Old 06-19-2007, 11:16 PM   #14
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My Invidia dp used to rattle when downshifting also. I bought new exhaust mounts and now it never happens.
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Old 01-03-2008, 10:49 PM   #15
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Quote:
Originally Posted by Woodward View Post
My Invidia dp used to rattle when downshifting also. I bought new exhaust mounts and now it never happens.
Good idea. I will put those on the want list.
How are they working out. Any side effects?
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Old 01-04-2008, 02:03 AM   #16
Dave D.
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My Helix catted hit too. I loosened the bolt by the tranny hanger, pried the pipe over with a 2X4, and absolutely tightened the s**t out of the bolt. Has held for months now, including hard driving. You only need about 3-4 mm of clearance.
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Old 04-06-2015, 03:31 PM   #17
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Reviving an old thread here for a new build.

I've got an 05 Legacy GT that I just put a fresh shortblock in with: BNR 18G, Megan Racing up pipe, Megan Racing motor mounts, V7 6sp and some other supporting mods.

I got a CNT catted down pipe and it was hitting the rear trans crossmember so badly that the mating surfaces on the bell mouth and the hot side of the turbo wouldn't meet flush. There was about 1/2" of gap. It was hitting on the straight part of the S bend in the DP on the driver side outer edge of the rear crossmember.

I'm wondering what is causing this to be SO FAR off. Here are my thoughts..
1. The aftermarket up pipe is positioning the turbo slightly off and the effect is magnified by the time it gets to the end of the DP
2. I am running 02 WRX motor mounts which I thought hold the motor at the same height as the 05 Legacy ones but maybe not
3. The BNR 18G hot side casting is at a slightly different angle than a VF series turbo. Same magnifying effect as #1
4. I got a bad DP

I am going to return the CNT DP and try an Invidia one. Hopefully that clears. :-/
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