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Tips to prevent exhaust leakage on hard driven street cars [Archive] - Toyota MR2 Message Board

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Tips to prevent exhaust leakage on hard driven street cars [Archive] - Toyota MR2 Message Board Toyota MR2 Message Board > Welcome To The Toyota MR2 Board! > MR2Board Sponsors > ATS Racing > Tips to prevent exhaust leakage on hard driven street cars PDA

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Xceler810-26-2012, 10:34 AMHey, I have a MR2 that you guys built a little while back and have battled with exhaust leaks for a while now (nothing to do with what you guys did :D).

Car has your basic street setup in a CT27 with fuel system and ROM tune, and I upgraded to the full 3" turbo back exhaust from Berk. About 2 years ago I had the turbo rebuilt and went thought the entire exhaust system from the head back with new fasteners and had all gasket surfaces decked to ensure proper sealing. I also reinstalled a turbo stay and put on the brace for the downpipe to b-pipe. The car has full polyurethane front and rear motor mounts and TRD side motor mounts.

Even so the car developed a leaks within 2 weeks and it got worse from there. Any advice welcome, I'm probably going to drill and safety wire the studs if I can't find a solution or double nut everything. CJMR2T10-26-2012, 10:40 AMWhere are you getting exhaust leaks? Is it the same spot each time? What gaskets are you using? and so on....

Anyone whom is going to be able to help you is going to need to know that stuff. The other info like that is has a ROM tune and such is irrelavent to the exhaust leaks and is not needed to be known. Xceler810-26-2012, 10:49 AMMy apologies sir, all brand new Toyota fasteners and gaskets, and I'm getting leaks at the downpipe to b-pipe, and manifold to turbo?

And although the rom tune isn't directly relevant to the leaks, it gives an idea of power level which will effect the amount of strain on the fasteners and gasket surfaces, and amount of heat that the exhaust components are seeing CJMR2T10-26-2012, 11:04 AMMy apologies sir, all brand new Toyota fasteners and gaskets, and I'm getting leaks at the downpipe to b-pipe, and manifold to turbo?

If your getting leaks consistantly with new fasteners (unless the nuts are not lock nuts), then the surfaces are not flat or is just poor quality fasteners (or poor quality gaskets).



And although the rom tune isn't directly relevant to the leaks, it gives an idea of power level which will effect the amount of strain on the fasteners and gasket surfaces, and amount of heat that the exhaust components are seeing

Not true really, the heat input wount change any any significant amount with power increase. Whether the engine makes 200hp or 400hp, the EGT (and thus heat input to the parts) will still be within a narrow temerature range (we are talking 50°F at best in most every case). ATSAaron10-26-2012, 11:15 AMI wonder if the upgraded motor mounts are allowing the engine to vibrate more? That's a shot in the dark. 99% of the time the issue has to do with heat.

Are you tracking the car?
Do you have a turbo bag, or heat wrap around the turbo?

On Christin's car I had to go to safety wire to keep things attached. I know Evo Dynamics has gone to safety wire on all their track cars as well.

Is that Doug Carlson's previous MR2?

Aaron Xander10-26-2012, 11:23 AMI wonder if the upgraded motor mounts are allowing the engine to vibrate more? That's a shot in the dark. 99% of the time the issue has to do with heat.

Are you tracking the car?
Do you have a turbo bag, or heat wrap around the turbo?

On Christin's car I had to go to safety wire to keep things attached. I know Evo Dynamics has gone to safety wire on all their track cars as well.

Is that Doug Carlson's previous MR2?

Aaron

If the motor mounts are indeed upgraded, I would assume that the polyurethane is more rigid than the stock mounts. That being said, I do not think that this would affect the amount of vibrations coming from the engine itself, but rather it would change how much of the engine vibrations are transmitted to the frame and how much the engine rotates before the axles start turning.

Sent from my iPhone 6 CJMR2T10-26-2012, 11:49 AMIf the motor mounts are indeed upgraded, I would assume that the polyurethane is more rigid than the stock mounts. That being said, I do not think that this would affect the amount of vibrations coming from the engine itself, but rather it would change how much of the engine vibrations are transmitted to the frame and how much the engine rotates before the axles start turning.

Sent from my iPhone 6
What Aaron I'm sure is getting at is not really that it's producing more vibration but rather the amount that is being transmitted to every other components. Even though the exhaust is solidly bolted to the engine in certain area, it still experiences less harmonic vibrations with the stock mounts then it does with poly mounts.

The mounts also act as vibration dampeners (i.e., they absorb the vibrations so nothing really experiences the vibrations). They basically act just like the harmonic dampener does on the crank.

There are tons of different frequencies that things vibrate at and some of those frequencies are more likely to cause vibration loosening of fasteners then other.

If your problem does seem to be that the fasteners are loosening and they are quality locking fasteners, then best bet is to safety wire them. There is a reason why it's a requirement in the aviation industries and why many tracks require bikes to have many of the fasteners wire locked but you probably are already aware of all that. Xander10-26-2012, 08:29 PMWhat Aaron I'm sure is getting at is not really that it's producing more vibration but rather the amount that is being transmitted to every other components. Even though the exhaust is solidly bolted to the engine in certain area, it still experiences less harmonic vibrations with the stock mounts then it does with poly mounts.

The mounts also act as vibration dampeners (i.e., they absorb the vibrations so nothing really experiences the vibrations). They basically act just like the harmonic dampener does on the crank.

There are tons of different frequencies that things vibrate at and some of those frequencies are more likely to cause vibration loosening of fasteners then other.

If your problem does seem to be that the fasteners are loosening and they are quality locking fasteners, then best bet is to safety wire them. There is a reason why it's a requirement in the aviation industries and why many tracks require bikes to have many of the fasteners wire locked but you probably are already aware of all that.

I agree with this wholeheartedly.

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