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Me again with more questions. Golly you guys must get tired of my ignorance lol.
So I've been looking at exhausts as a follow up on my CFI improvement thread from earlier. I figure the exhaust is the easiest mod I can do - both in installment and not needing to affect anything else so they work.
Now. I was planning to go Flowmaster all the way through from the engine to the back of the car, turns out that's not possible because they don't do headers, nor piping for most aftermarket headers (their manifold downpipe/y-pipe seems to only be for stock manifold designs)
So If I were to get any aftermarket headers, how would I go about attaching them to the cat? rego laws in AU dictate I must have one, so I can't straight pipe it all the way back like I want to. I noticed some companies do header exhaust Y-pipes (ref: http://www.parts123.com/corvettecent...50f&ukey=20947), so I was thinking of those. Are they universal for any header?
For reference, the cat-back system I'm not wavering on is the Force II for 84/85.
I've found DIY work on exhaust systems to be pretty unforgiving. The parts aren't easily reworkable unless you're a competent welder. Of course, the headers you choose must be compatible with the front "Y" pipe. The "Y" pipe you've referenced is for an '86, so I wouldn't expect it to fit! Have you found your headers, or are you planning to keep your '84 tubular exhaust manifolds?
With your line of questions, I'd say it's time to look for a competent muffler shop.
California smog laws don't let me change any pre-cat parts, and my '84 tubular manifold wasn't a very good match to my exhaust ports, but I was able to blend the entry angle of the manifold flanges pretty close to the port shape. The tubes of the manifold can't be enlarged since the tubular material is pretty thin. Fortunately, the flanges are pretty thick! (Just don't cut the welds!)
For your application, a 1984 Cross-Fire, Hooker makes headers and a front Y pipe to connect to the stock cat. You then use the stock exhaust to connect from the cat to the rear Y pipe and the Flowmaster mufflers. Walker makes a rear Y with a crossover pipe which I believe works well. I had this set-up on my 84 and it sounded good (subjective of course) to me.
Have you found your headers, or are you planning to keep your '84 tubular exhaust manifolds?
California smog laws don't let me change any pre-cat parts
I have found some headers. Not exactly what i wanted, but my 84 is also a neutered Cali model, so it has EGR, and its easier to narrow my search in mind of that, than it is for me to remove the EGR system. Simply put, i cant be arsed and the payoff isnt really worth the work to delete it.
They have the horizontal exit like the front Y-pipe i linked before, hence why i was keen on that piece and was wondering if it would match up to the headers and my cat. Since these parts will be costing me well over 1500 bucks each here including shipping and would like to nail it on the first go.
Last edited by Aussie84; Apr 25, 2016 at 08:57 AM.
Reason: Fixing link
I have found some headers. Not exactly what i wanted, but my 84 is also a neutered Cali model, so it has EGR, and its easier to narrow my search in mind of that, than it is for me to remove the EGR system. Simply put, i cant be arsed and the payoff isnt really worth the work to delete it.
There is no "cali model '84"; they're all the same, and they all have EGR. The EGR system is integral to the intake manifold, so it has nothing to do w/the headers. You can cut/block or plug and EGR provisions on any headers that you get. Also, realize that EGR doesn't hurt power; it's inactive at WOT.
There is no "cali model '84"; they're all the same, and they all have EGR. The EGR system is integral to the intake manifold, so it has nothing to do w/the headers. You can cut/block or plug and EGR provisions on any headers that you get. Also, realize that EGR doesn't hurt power; it's inactive at WOT.
Tony not to rain on your Parade but the fact your car has been converted to a right side drive would that Effect your access to a set of Headers, without doing Modifications
Last edited by s carter; Apr 25, 2016 at 01:20 PM.
Tony not to rain on your Parade but the fact your car has been converted to a right side drive would that Effect your access to a set of Headers, without doing Modifications
Not sure whom you are talking to, but I assume it's me, as I'm the one who lives in the country with right hand drive cars.
To which, I respond that mine is left hand drive. Factory standard as it came from the factory.
Not sure whom you are talking to, but I assume it's me, as I'm the one who lives in the country with right hand drive cars.
To which, I respond that mine is left hand drive. Factory standard as it came from the factory.
My bad I converse with Tony AussiecorvetteNut on another Forum and he to has a 84 Right drive and he is totally changing up his car to the point of putting a possible ZF in it and is always looking for more power
Not sure if this is any food for thought, but my LT1 car has stock manifolds, cats, to X-pipe, straight pipe all the way out the back. Love the way it sounds and I built it myself for about a hundred bucks. I would think a shop would want $4-500 American
There is no "cali model '84"; they're all the same, and they all have EGR. The EGR system is integral to the intake manifold, so it has nothing to do w/the headers. You can cut/block or plug and EGR provisions on any headers that you get. Also, realize that EGR doesn't hurt power; it's inactive at WOT.
I'm back on this after some more research and general pondering.
Your link seems to be the only long header I can find with the EGR, which I've learned I have to keep for legal reasons. The advertisement says it needs the 88-91 EGR pipe, and through comparing the stock EGR fittings and the headers I've been looking at, they are in fact quite different. What is the next step? Seems easier to just lop off all the EGR fittings, get headers without them, and hope it doesn't get me in trouble.
Edit: According to Hooker's website, they don't do 84 headers, or 85, 86, 87, 88... but I really want long tubes.
Last edited by Aussie84; Jun 14, 2016 at 01:09 AM.
Your link seems to be the only long header I can find with the EGR, which I've learned I have to keep for legal reasons. The advertisement says it needs the 88-91 EGR pipe
Your comment on the external EGR pipe for the '88-'91 confuses me. If you are still using the '84 CFI intake manifold, no external EGR pipe is required. The CFI takes its exhaust flow for the EGR from the center "heat riser port" in the center of the head thru the intake manifold. Do the heads you are using have this center "heat riser port"? If so, you don't need any provisions for an EGR in the exhaust headers.
Your comment on the external EGR pipe for the '88-'91 confuses me. If you are still using the '84 CFI intake manifold, no external EGR pipe is required. The CFI takes its exhaust flow for the EGR from the center "heat riser port" in the center of the head thru the intake manifold. Do the heads you are using have this center "heat riser port"? If so, you don't need any provisions for an EGR in the exhaust headers.
Well now I'm confused all over again.
Left side
Right side
You tell me? Is the piping coming out of my exhaust manifold /not/ the EGR piping? Meaning I would need headers with that piping?
For reference, here is the header linked earlier in the thread, the fittings look similar, but not identical. Please help a moron out lol.
Well now I'm confused all over again.
Left side
Right side
You tell me? Is the piping coming out of my exhaust manifold /not/ the EGR piping? Meaning I would need headers with that piping?
For reference, here is the header linked earlier in the thread, the fittings look similar, but not identical. Please help a moron out lol.
No extra header piping needed if your heads are EGR compatible. The supplemental plumbing you're looking at belongs to the air injection system for the cat. Many just cap the ends or delete it entirely, either for a cheaper exhaust upgrade, or to clear up room in the engine bay w/ pump removal & shorter belt...or both!
No extra header piping needed if your heads are EGR compatible. The supplemental plumbing you're looking at belongs to the air injection system for the cat. Many just cap the ends or delete it entirely, either for a cheaper exhaust upgrade, or to clear up room in the engine bay w/ pump removal & shorter belt...or both!
So, to sum up, I'd have no issues swapping out the factory manifold with the new ones, since they're EGR compatible?
So, to sum up, I'd have no issues swapping out the factory manifold with the new ones, since they're EGR compatible?
Other than figuring out how the long tubes will mate with your exhaust, and adding an O2 sensor bung in a good location, should be no problems. Mine is installed in cyl #7, as that's where lean imbalance tends to happen due to #5 and #7 cyls firing one right after the other.
Other than figuring out how the long tubes will mate with your exhaust, and adding an O2 sensor bung in a good location, should be no problems. Mine is installed in cyl #7, as that's where lean imbalance tends to happen due to #5 and #7 cyls firing one right after the other.
The plan was to get a new front Y pipe to mate with these headers and the cat/catback would stay the same.
Now what's this about an O2 sensor? I know they're important enough to be needed, but why would a new set of headers make a difference? Where is the current O2 sensor, if I have one?
The plan was to get a new front Y pipe to mate with these headers and the cat/catback would stay the same.
Now what's this about an O2 sensor? I know they're important enough to be needed, but why would a new set of headers make a difference? Where is the current O2 sensor, if I have one?
Tumbling down the mechanical rabbit hole
You're alright
I'm not certain of the exact stock O2 location, but it's a 1-wire probe into the driver's side exhaust. I want to say it was in the upper area of the stock y-pipe which would overlap with long tube headers, fairly close to the end of the stock manifold. Anyway, jack up the driver's side and look for the wire; you'll find it.
When converting to headers, it's important to install the O2 close to the head, so it will absorb enough heat to produce an accurate signal. Newer cars have multi-wire O2s with a built-in heater circuit, so location isn't as much of an issue.
Exhaust questions.
