Miatapower List Archive

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Mail From: "Mikael Kallerman" <(email redacted)>

Easy peasy. If it's not the turbo hitting the shelf, it's the exhaust downpipe after the turbo hitting the subframe. Engine rocks to the left while engine braking and turning to the right exacerbates this leaning over. I have also managed to get a similar sound, but not so "hard" by having valve cover contacting a strut tower bar.

Possible fixes are repositioning the downpipe, having it welded/modified, trying harder motor mounts or getting fresh ones (if you had it apart, why didn't you change it anyway? Not all defects are visible by eyeballing them.) or just repositioning the motor mounts (IIRC one of them has a slotted hole for adjustment).

HTH

Mike

----- Original Message -----
From: <(email redacted)>
To: <(email redacted)>
Sent: Tuesday, September 16, 2003 3:01 PM
Subject: NPC: Noise under HARD cornering


> Maybe someone else has experienced this and has the answer. I've done a few
> track days this summer and there is a loud and annoying noise I am hearing
> under a certain set of conditions:
>
> Hard right corner
> Throttle closed, engine braking
>
> Under these conditions engine vibration is fed into the body/chassis
> somewhere and a loud growling sound ensues. Really disconcerting on the
> track. If I feed in a little throlttle it goes away. The engine must be
> torquing over enough for contact under this condition. I haven't been able
> to track down where it hits though. I have ruled out the turbo contacing
> the "shelf". A possible contact point would be the FMII intake pipe against
> the aluminum heat shield . There isn't much clearance there but I hven't
> found evidence of contact. I thought I might have a bad motor mount but
> removed the passenger side one for inspection at it was OK. I had a spare
> but didn't install it because it looked no better. I haven't been able to
> reproduce this on the street but turn 3 at Brainerd will bring it on every
> time.
>
> Any thoughts ?
>
> Thanks,
>
> Steve
> _____________
> This e-mail transmission and any attachments to it are intended solely for
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> confidential and privileged information. If you are not the intended
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>
>
>

This read-only message was archived from a public mail list.
Mail From: "Sonny" <(email redacted)>

DP or forward part of the exhaust contacting the front cross brace or lower
firewall? If it's the lower part of the firewall, you can miss it if
looking at the exhaust from underneath the car as it'll be the top portion
of the pipe rubbing.

Later...
Sonny

If everything is coming your way,
You're in the wrong lane!

sonny2.com/

This read-only message was archived from a public mail list.
Mail From: "Larry Alster" <(email redacted)>

Worn engine mounts allowing too much engine movement??

Larry Alster

1991 "White Knight" CSP #99
1992 "Silver Bullet" EM #17 BEGI System 4.2+
1992 "Honey Bee"
----- Original Message -----
From: <(email redacted)>
To: <(email redacted)>
Sent: Tuesday, September 16, 2003 9:01 AM
Subject: NPC: Noise under HARD cornering


> Maybe someone else has experienced this and has the answer. I've done a
few
> track days this summer and there is a loud and annoying noise I am hearing
> under a certain set of conditions:
>
> Hard right corner
> Throttle closed, engine braking
>
> Under these conditions engine vibration is fed into the body/chassis
> somewhere and a loud growling sound ensues. Really disconcerting on the
> track. If I feed in a little throlttle it goes away. The engine must be
> torquing over enough for contact under this condition. I haven't been able
> to track down where it hits though. I have ruled out the turbo contacing
> the "shelf". A possible contact point would be the FMII intake pipe
against
> the aluminum heat shield . There isn't much clearance there but I hven't
> found evidence of contact. I thought I might have a bad motor mount but
> removed the passenger side one for inspection at it was OK. I had a spare
> but didn't install it because it looked no better. I haven't been able to
> reproduce this on the street but turn 3 at Brainerd will bring it on every
> time.
>
> Any thoughts ?
>
> Thanks,
>
> Steve
> _____________
> This e-mail transmission and any attachments to it are intended solely for
> the use of the individual or entity to whom it is addressed and may
contain
> confidential and privileged information. If you are not the intended
> recipient, your use, forwarding, printing, storing, disseminating,
> distribution, or copying of this communication is prohibited. If you
> received this communication in error, please notify the sender immediately
> by replying to this message and delete it from your computer.
>
>