hot side leaks and fumes in cabin issues - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 11 Old 02-08-2016, 08:48 AM Thread Starter
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hot side leaks and fumes in cabin issues

I have your typical foxbody,306 fcam 1.7s,perf.rpm heads,cobra int.42lb inj. on3 70mm turbo kit.there y pipe to a mac cat back system with tail pipes.I had a lot of leak issues at the downpipe to turbo connection and all the vbands.Took it apart put copper hi temp rtv on all flanges,reclamped everything.let it sit overnight.It is 3 times better now but still stinks in the car enough that after driving with the windows half way down you still need to change clothes and shower...I don't see any cracks in the headers or any leaks at header to head.Iam also using copper rtv instead of header gaskets.Anybody else have these issues?how did you cure them?I built this set up for my wife and she loves the car but not the smell...


big cox racing
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post #2 of 11 Old 02-08-2016, 05:29 PM
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Based on my dyno tuners recommendations I took every v-band connection to the belt sander to ensure that each piece had a perfectly flat face/surface. This included the header flanges. I have had zero sealing issues, so I would recommend this to anyone out there having sealing issues at the v-band connections. i am running stock On3 vband clamps and no rtv. I have one season = over 4K miles so far on mine.


1989 5.0 GT / Trickflow HCI / 70MM On3 kit

414 HP / 409 Ft Lbs on 6 PSI @ 5,500 on APS tune!
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post #3 of 11 Old 02-08-2016, 08:44 PM
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For my v-band rings I offset the rings 3/16" to one side so one pipe would slide into the opposite ring, ie a male and female side. This helps locate the rings perfectly and hopefully seals it up good. Are yours done this way?

ks


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post #4 of 11 Old 02-09-2016, 09:39 AM Thread Starter
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I have no rings.

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post #5 of 11 Old 02-10-2016, 08:32 AM
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You can use a shop vac to blow air in the tail pipe and track down the leaks. A quality v band clamp will help a lot.

89 coupe, 347 R block, t400 tubro build in progress
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post #6 of 11 Old 02-10-2016, 10:44 AM Thread Starter
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guess just clog one tail pipe and pressureize the other.

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post #7 of 11 Old 02-10-2016, 11:04 AM
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Yes a heavy zip lock bag with tape works well. Also tape around the hose to get a good seal.

89 coupe, 347 R block, t400 tubro build in progress
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post #8 of 11 Old 02-10-2016, 04:41 PM Thread Starter
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cool will give it a try.

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post #9 of 11 Old 02-12-2016, 10:09 AM Thread Starter
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how many of you guys have sealed up the shifter hole and what did you use besides the factory boot and bracket?

big cox racing
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post #10 of 11 Old 02-17-2016, 01:28 PM Thread Starter
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did the shop vacc test last night used soapy water...only place not leaking was were I used rtv....everything else bubbled up worst was turbo to manifold and ball and socket at flex.


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post #11 of 11 Old 02-18-2016, 12:05 PM Thread Starter
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What about the turbo mounting gasket yes or no or just rtv no gasket.mine with gasket no rtv leaking like a mofo.
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