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Can't figure out this...about to take to the shop... help please

TroyI

Ready to race!
Location
Austin, Texas
I can not find the answer to this anywhere on the friggin' internet.

I'm having a strange noise from my exhaust (or rear end). This only happens when the oil temp hits 130degree and only when the car is going 0-5 mph and 5-0 mph while barely touching the gas peddle. No problems at wide open throttle. Occasionally it sounds like a rattle in the rear, possibly the exhaust pipes, but other times I can swear it's coming from the exhaust itself.

BTW, I am stage 2 with APR downpipe and stock exhaust. And this started the day after a trip to the dragstrip.

I appreciate any help in this, as it worries me that something is going wrong inside (upstream from) the exhaust.

Troy
 

swcrow

Autocross Champion
Location
Virginia
Is it a rattle, resonance sound or a metal on metal 'ting' sound?
 

JerseyDrew77

Autocross Champion
Location
Virginia & NC
Did you jack the car up to inspect the entire exhaust for any loose parts?
 

swcrow

Autocross Champion
Location
Virginia
That's low rpm, high torque.... Check hangers on DP to see if they're contacting the body, through the bushings.

Did this happen all of a sudden when the temp dropped?
 

TroyI

Ready to race!
Location
Austin, Texas
Sometimes it rattles and sometimes it's a gurgle sound. I have jacked it up and inspected the rear, but not up closer to the DP.

It is a Zero torque time. only when the car is coming to a stop .... 5-0mph. Or when I BARELY touch the throttle from 0-5mph.

Could it be something came loose inside the DP or exhaust and only happens after it heat up a bit?
 

swcrow

Autocross Champion
Location
Virginia
Catted?
 

JerseyDrew77

Autocross Champion
Location
Virginia & NC
Which DP do you have and does it have a cat or no?
 

swcrow

Autocross Champion
Location
Virginia
If it's temp dependant, and cold outside, maybe thermal expansion connected
 

mike-y

Passed Driver's Ed
Location
Los Angeles
is your DP catted? I once burned up part of my cat at the track, and pieces of it broke off and ended up inside the muffler, where they'd occasionally rattle.
 
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