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Engine - General, Exhaust & Induction Topics about the general engine items, exhaust system discussed here & Improving the intake tract - air filter to intake valve.

 
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post #1 of 9 Old 06-09-2016, 07:15 PM Thread Starter
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Turbo exhaust on TBI manifold

Does anyone know if the turbo exhaust will bolt on to tbi exhaust flange? I'd like to buy the fwdperformance 2.5" exhaust.
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post #2 of 9 Old 06-10-2016, 05:41 PM
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Re: Turbo exhaust on TBI manifold

nope the downpipes are different in length and angles.
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post #3 of 9 Old 06-11-2016, 07:58 AM Thread Starter
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Re: Turbo exhaust on TBI manifold

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Originally Posted by GLHNSLHT2 View Post
nope the downpipes are different in length and angles.
Okay. That's disappointing. I was hoping to get it on before the turbo.

Thanks.
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post #4 of 9 Old 06-11-2016, 09:24 AM
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Re: Turbo exhaust on TBI manifold

honestly if you're going turbo just go 3". The turbo will like it much better. If you wanted you could get the cat back system installed now, with an adapter from the downpipe to the cat back systemp, then do the downpipe and cat area later.
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post #5 of 9 Old 06-11-2016, 11:10 PM Thread Starter
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Re: Turbo exhaust on TBI manifold

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Originally Posted by GLHNSLHT2 View Post
honestly if you're going turbo just go 3". The turbo will like it much better. If you wanted you could get the cat back system installed now, with an adapter from the downpipe to the cat back systemp, then do the downpipe and cat area later.
yeah that's something I could get behind. Not sure how the adapter would work though. You'd need multiple adapters to get from 1 7/8" to 3".
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post #6 of 9 Old 06-11-2016, 11:51 PM
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Re: Turbo exhaust on TBI manifold

yea could go from that to 2.5" then up to 3" so really only 2. Not to bad.
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post #7 of 9 Old 06-12-2016, 01:57 AM
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Re: Turbo exhaust on TBI manifold

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Originally Posted by mr.crocodile View Post
yeah that's something I could get behind. Not sure how the adapter would work though. You'd need multiple adapters to get from 1 7/8" to 3".
NOTE Ok the max size that fits over rear trailing arm to muffler is (2.25" OD) so the rest of the pipe should be the same size OD . muffler pipe to the tip flares to 3." oval . Pipe from end of CAT running a 2.5"OD pipe threw both 90* turns,,,it reduced to 2.25 for axil pipe to muffler ....The Turbo muffler has two baffled tube chambers the muffler offset top of center in 2.25"OD offset bottom out 2.5"OD.


Ok smaller pipe causing more back pressure the only reason for the change in sizes is to increase flow as it drops off when the pipe turns 90* by 35% for each 90* turn . Their is a balance of flow and pressure needed to operate within systems for cars 4-Wire O-2 sensor ,, so a nominal amount of back pressure is required,,,, The change in flow is a mess up for CPU readings..


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post #8 of 9 Old 06-12-2016, 04:20 AM
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Re: Turbo exhaust on TBI manifold

i did it with the 2.5 exhaust real problem converting a tbi downpipe is its basically all cat so there isnt much left after that's removed. tbi is also really loud too compare to turbo with the same exact exhaust system . -btw a true 3" mandrel bent pipe will fit over the axle assembly fine if you use the right series of bends with no oval sections or reductions in size
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post #9 of 9 Old 06-14-2016, 09:01 AM
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Re: Turbo exhaust on TBI manifold

as mentioned 2 1/2" goes in without issue, you have to place the *over the axle* pipe in the center between the spring, the panhard bar support and the fuel tank so you don't get any contact with those items. 3" is even tighter.

This an old pic of my 2 1/2" exhaust, I did the exhaust in two sections, the front section was a complete single section from the exhaust flange all the way back to the axle & a short section in front of & into the muffler/downpipe. I used a stainless exhaust band clamp to join the main piping to the inlet of the muffler I was using.




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