73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Performance => Exhaust => Topic started by: plik on December 22, 2016, 12:09:52 am
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I have a 5.7 350 w/ TBI (1987-1995). It was a crate engine purchased about 10 years ago (it lives inside a 1984 suburban k20 4x4).
9.25:1 Compression ratio
(http://paceperformance.com/images/M27944197.gif)
With these exhaust headers (Hedman 69090) --
(http://www.jegs.com/images/photos/500/500/500-69090.jpg)
Okay, the questions .....
1. How large (diameter) should my exhaust pipes be? (2.5", 3", etc.)
2. Should I use an "H" pipe to connect the two banks, or just have each side of the engine be completely independent?
3. Where is the best place for an oxygen sensor?
4. Would Flowmaster Super 10 Series Mufflers be a good idea? If not, what would be better?
5. Should I have 1-in-1-out or 1-in-2-out mufflers?
6. What's the best catalytic converter for this vehicle?
FAQs:
- I want a good sounding, loud exhaust -- not loud stupid, but loud deep
- I care more about sound than off-the-line acceleration
- I never tow anything, but often do freeway driving
- I do want to pass emissions (Arizona)
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Before I answer all of your questions in one fail swoop, I need you to answer 2 questions for me.
1. How many O2 sensors does the truck truck need/use. You said TBI so based on my experience, that should be only one. Correct?
2. How many catalytic converters is the truck required to have? Some states require the same amount as it had factory, some require the same amount for the number of exhaust pipes used, see what I mean? So what's your requirements?
Answer those 2 for me and I should be able to answer all of yours easily. (Note: I'm very experienced with these TBI systems on small blocks.)
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Before I answer all of your questions in one fail swoop, I need you to answer 2 questions for me.
1. How many O2 sensors does the truck truck need/use. You said TBI so based on my experience, that should be only one. Correct?
2. How many catalytic converters is the truck required to have? Some states require the same amount as it had factory, some require the same amount for the number of exhaust pipes used, see what I mean? So what's your requirements?
Answer those 2 for me and I should be able to answer all of yours easily. (Note: I'm very experienced with these TBI systems on small blocks.)
1. Correct -- one O2 sensor
2. Two -- like you said, one for each exhaust pipe
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before you ask us i would ask your inspection station what he wants to see and go from there
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before you ask us i would ask your inspection station what he wants to see and go from there
Definitely good advice. They're fine with my current setup, which is dual exhaust -- one on each side, completely independent, coming out the sides, in front of the back tires.
I should explain my current setup:
Right now I hate how my exhaust sounds. I think it's terrible. It looks cool, though.
It also goes from a 3" header (after the collector) to a 2.5" pipe. So, I'd like to switch that to be 3" all the way out, but I'm not sure if that's a good idea.
And for the muffler, I like what this guy has done --
[youtube]https://www.youtube.com/watch?v=X8I0DZpzp9U[/youtube]
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I would recommend 3" single exhaust with a flowmaster. The O2 bung should be in the collector.
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Whats the highest quality quietest muffler one can purchase? I mean whisper quiet, like a sewing machine.
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a prius
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Whats the highest quality quietest muffler one can purchase? I mean whisper quiet, like a sewing machine.
Stock, or something with a lot of baffles and fiberglass.
As to the OP, if you like the duals, 2.25 with an "x" or "H", your choice of muffler(magnaflow seems to be the better choice for a good deep "rumble"). Or run the single 3". Both will be good selections.
Sent from my iPhone using Tapatalk
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1. How large (diameter) should my exhaust pipes be? (2.5", 3", etc.) dual 2.5 will be louder but not deep, single 3" will be louder and deeper, dual 3" deep and quiet at idle( straight pipe opinion for experience on these sizes)
2. Should I use an "H" pipe to connect the two banks, or just have each side of the engine be completely independent?
A:This is a good idea even though you say you're not worried about acceleration.
3. Where is the best place for an oxygen sensor?
A:Driver Side collector is where the factory TBI is located and that's based on #1 cylinder and firing order. 10* above center from a lateral perspective. this will prevent moisture form collecting on the sensor and ensure a long life. depending on your transmission shift linkage you may have to move it to the frame side and raise the angle closer to the top.
4. Would Flowmaster Super 10 Series Mufflers be a good idea?If not, what would be better? A:
LOUD!! Muffler basics= shorter mean louder! The only thing they offer louder than this muffler is the 'Outlaw' race muffler. bot of these will be loud. most importantly is in-cab noise. You will definitely have to commit to loving the sound of your exhaust or loud music if you choose either of these.
5. Should I have 1-in-1-out or 1-in-2-out mufflers? Duals= dual mufflers...all I got on this one
6. What's the best catalytic converter for this vehicle? Doesn't matter, all newer style CAT's flow great and restrict very little sound. Meet your inspection criteria and check the box.
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https://www.youtube.com/watch?v=QEBdiW4LbI0
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a prius
Lol!!!
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I saw the vid. All way to loud! Lol
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phil, I know you're not 100 years old.... too loud? ha!
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a prius
A+
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If it were a camaro or impala or a chevelle or road runner, charger, goat, torino, mach 1, nova or a 442, i'd go open headers. I just dont see a truck as a "hot rod."
This is what i see as a truck:
(http://uploads.tapatalk-cdn.com/20161224/692386c76d81b8890d15829450937d0b.jpg)
(http://uploads.tapatalk-cdn.com/20161224/555b7416f6b0ac417f019c8d8453e720.jpg)
This i dont get:
(http://uploads.tapatalk-cdn.com/20161224/13aa1fc3c80fab2ad5afd18735bb8054.jpg)
I love the factory look. Everyone knows that by now.
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I have a 5.7 350 w/ TBI (1987-1995). It was a crate engine purchased about 10 years ago (it lives inside a 1984 suburban k20 4x4).
9.25:1 Compression ratio
(http://paceperformance.com/images/M27944197.gif)
With these exhaust headers (Hedman 69090) --
(http://www.jegs.com/images/photos/500/500/500-69090.jpg)
Okay, the questions .....
1. How large (diameter) should my exhaust pipes be? (2.5", 3", etc.)
2. Should I use an "H" pipe to connect the two banks, or just have each side of the engine be completely independent?
3. Where is the best place for an oxygen sensor?
4. Would Flowmaster Super 10 Series Mufflers be a good idea? If not, what would be better?
5. Should I have 1-in-1-out or 1-in-2-out mufflers?
6. What's the best catalytic converter for this vehicle?
FAQs:
- I want a good sounding, loud exhaust -- not loud stupid, but loud deep
- I care more about sound than off-the-line acceleration
- I never tow anything, but often do freeway driving
- I do want to pass emissions (Arizona)
1. For your setup, 2.5 inch pipe will be plenty and adequate.
2. You don't have too, you can if you want. It does make servicing your transmission a tad more difficult. I opted to not use one and it never caused me any grief.
3. Driver side collector or just after the collector. Had no issues with mine being there, just found the best place for it with linkage and had no issues. If it's not a heated 02, I would recommend installing a heated O2, it helps with moisture, reading accurately and is better for engines with headers, especially full length like yours.
4. I used flow master super 44s, they were healthy sounding during normal driving, pretty much faded off at freeway speeds and were pretty quiet, sounded awesome when I goosed it. Only problem I ever had was idling for a while like when in a drive thru but I had mine dumped over the rear axle and pointed at the ground so going all the way will eliminate that issue. I've also heard MagnaFlow's and Borla's mufflers with nice sound. If I was gonna build another system, I would possibly look into one of those. Then again, Flowmaster is always a classic.
5. That's dependent on which setup you choose. If you do independent sides, then 2 mufflers, both 1-in-1-out. If you do a different setup then it depends on the arrangement. Mine was independent true duals, 1-in-1-out.
6. There are alot of cats out there that are efficient. I've heard good things about MagnaFlow's cat converters. Not sure what else is out there.
I had a TBI 350 that was bored, cammed, with aluminum heads, the whole engine was built top to bottom, my exhaust was simple, affective and clean. So your current setup and goals are similar to what I was using.
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From a performance standpoint, on a engine that is running up to about 350 HP there is no reason to use any larger than full duals and 2.5" pipes. And the smaller pipes are easier to bend and route.
One combination that maintains performance flow, but still remains quiet is to use 2.50" DynoMax Super Turbo mufflers, full duals with H pipe, and run the pipes all the way to the back bumper. This setup will flow well, but have a very low muscle car rumble tone.
Bruce