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  1. #1

    Default Ripped the band-aid and a little bit of science with exhaust...

    Well, I had a rear main seal go and while the guys were fixing that I said "Hey, while you have it all torn up, why not toss these brand new Hooker 6128hkr super comp shorty equal length headers I have had sitting in the garage for 2 years on there?". They said, "Sure! Why not?".

    So, I finally modified my untouched g.t. 350. But here is where the contribution to understanding the engine comes in... I had them touch nothing else. Exact same engine, exact same exhaust (all smog gear intact), exact same header pipe (they modified the attachment to the headers to make it work).

    So what happens when you just get rid of the old exhaust manifolds on an 84.5 convertible 5.0 anni with CFI and an automatic? Well, the headers fit (they swore a lot, or so they tell me) but they fit. At least these fit. Down low off of a start not much changed. Sounds a bit more more 'throaty' but with a big old muffler on a single exhaust I didn't expect too much.

    When you get up into the 2k+ range I start to feel the difference. The car at high RPM now surges rather than feels 'held back'. It's not crazy but it no longer feels hobbled. Climbing slope at forty and flooring it used to result in lots of noise but not a whole lot of acceleration. Now it is a throatier noise and some real acceleration. At highway speeds (50 and up) the car is responsive and accelerates without the kind of effort it had before.

    I am sure it would do all of this even more so with dual exhaust or perhaps minus the 33 year old cat but that is not the point. yet,

    So, there you go. What happens when you just swap out the headers. Like I said though, the guys that did it (seasoned mechanics) said it sucked bad. However...


    Next project will be the intake manifold. I don't expect much there but since I have ripped that band-aid, why not...Name:  1ho.jpg
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    Last edited by emerygt350; 08-28-2017 at 07:54 PM.

  2. #2

    Default

    Good, Good, let the modifications flow through you. Feel the force of the added power.

    Jess
    Currently own;
    1979 Mustang, v6 swapped to EFI 393, custom installed m122 blower, 4r70w trans, Megasquirt II, T-top swaped in.
    Previously owned;
    1990 Mustang, 545 BBF, C-4 with brake, ladder bars.
    1983 Mustang, 1984 SVO Mustang
    1984 Mustang convertible, v6 swapped to 351
    1986 Mustang GT, 1989 Mustang GT convertible
    1992 Mustang coupe, 4 swapped to 302

  3. #3
    FEP Member brianj's Avatar
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    Feb 2012
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    Raymond, New Hampshire
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    Default

    Lol. Once you start, good luck. You're screwed.
    1983 Mustang G.T. No-option stripper- I like strippers.
    5.0, GT40P heads, Comp Cams XE270HR-12 on 1.6 rockers, TFI spring kit, Weiand 174 blower, Holley 750 mechanical secondarys, Mishimoto radiator, Edelbrock street performer mechanical pump, BBK shortys, T-5 conversion, 8.8 rear, 3.73 gears, carbon fiber clutches, SS Machine lowers, Maximum Motorsport XL subframes, "B" springs.

  4. #4

    Default

    Quote Originally Posted by brianj View Post
    Lol. Once you start, good luck. You're screwed.

    Yeah, I know. All of the online ads are now showing an edelbrock 3723 and fan clutch kits.

    Gonna have the duals done next though. Some time this winter...

  5. #5
    FEP Senior Member Matt J's Avatar
    Join Date
    Jul 2012
    Location
    Georgia
    Posts
    516

    Default

    Hey, it's all bolt-on stuff. If you really want to keep the original stuff in the event that someday someone will really want it, go ahead. The car will be better to drive with the upgrades, and that's really why you own it, right?

  6. #6

    Default

    Yeah, that is my plan. I should get the car back tomorrow with the full duals (bbk h catted h-pipe and walker dual setup). Just got the electric fan setup in the mail today.


    Will put a 3723 edelbrock on it this winter. That is probably all I can do with the CFI setup. If I can get up to 190 or 200 hp I think I will be happy. for now...

  7. #7

    Default

    Just got the car back from the mechanics... put the full duals on it...

    Now we have the hooker shorty equal lengths mated up to catted 1521 BBK H pipe going into a couple of Flowmasters heading out into full dual pipes to the rear.

    Here are some pics and a clip of the sound. Needless to say it is running really nice now.

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    here is the sound

    https://youtu.be/r5_UZ8ponYY

    Replaced the 33 year old o2 sensor in the process and I think it was time...

    the Flowmasters are loud but for a summer weekend cruiser I don't mind. On the highway it does not drone and that is all I care about. It does at 20mph but whatever...

    I did just figure out the clutch on the fan is shot (spun real nice and easy at 215 degrees) so this weekend I am going to put my electric fan in.

  8. #8

    Default

    Oh, and this is still with the stock intake and CFI. I love the sound of the CFI so it is going to be hard to part with. Almost sounds like it has a supercharger when you open it up at low speeds...

  9. #9

    Default

    Oh, and they fit it around the brakes and gas lines without modifying the stock setup... Gonna have to keep my eye on that. Looks like good separation though and it is rock solid in there.

  10. #10

    Default

    Sounds really nice.

    Toss in some higher ratio rockers and turn the idle down just a touch and it will sound way more muscular - FYI.

    Im running BBK equal shortly headers with a catted X from UPR and flowmasters (for now) with full tailpipes on my 86. I wish I would have stayed with H - it's a little more like a ricer sound than I wanted.

    I went to a Typhoon intake and it made no difference in engine sound really except for opening up new RPM. The sound from 5000-6250 is addictive.

    Your car with an intake and a little a little more cam should wake up substantially now that the exhaust is opened up.
    Last edited by erratic50; 10-09-2017 at 01:03 PM.

  11. #11

    Default

    Yeah, idle is a tough thing for CFI people. So are cams for that matter. My idle has actually been too low till the new O2 sensor so I am going to let the car think about its behavior for a little while before I try to do anything.

    My winter to do list is new intake and a very mild cam at the same time might be pretty nice.

  12. #12

    Default

    Reset the computer and the idle has fixed itself. Car is running sooo good now. Stopped and Watkins Glen while out cruising around on the 80 degree day and picked up some heat tape (the stuff Advance Auto in Watkins Glen stocks are very very different from your average store) for that break line that is uncomfortable close to the exhaust. Guy at the counter asks if I am racing up at the track. Hah.

  13. #13

    Default

    Round Flowmasters? Are they the Hushpower ones?

    Jess
    Currently own;
    1979 Mustang, v6 swapped to EFI 393, custom installed m122 blower, 4r70w trans, Megasquirt II, T-top swaped in.
    Previously owned;
    1990 Mustang, 545 BBF, C-4 with brake, ladder bars.
    1983 Mustang, 1984 SVO Mustang
    1984 Mustang convertible, v6 swapped to 351
    1986 Mustang GT, 1989 Mustang GT convertible
    1992 Mustang coupe, 4 swapped to 302

  14. #14

    Default

    Quote Originally Posted by Mustang-junky View Post
    Round Flowmasters? Are they the Hushpower ones?

    Jess
    The mechanic said they were 100 a piece so I assume they are outlaws or something. Although they are called a muffler, I think that is only because they are steel, slightly larger than exhaust pipe, and expensive. I can see why he chose them though, it really did allow him to sneak the duals in without moving anything. I heat taped the gas and brake lines that were near the system and I didn't find anything closer than a few inches (but I taped it all anyway, might as well be safe).

  15. #15

    Default

    Flowmaster doesn't have any mufflers that look like that in their catalog now. Just didn't want you to get ripped off. The look more like DynoMax bullet mufflers which are much cheaper than Flowmasters.

    Jess
    Currently own;
    1979 Mustang, v6 swapped to EFI 393, custom installed m122 blower, 4r70w trans, Megasquirt II, T-top swaped in.
    Previously owned;
    1990 Mustang, 545 BBF, C-4 with brake, ladder bars.
    1983 Mustang, 1984 SVO Mustang
    1984 Mustang convertible, v6 swapped to 351
    1986 Mustang GT, 1989 Mustang GT convertible
    1992 Mustang coupe, 4 swapped to 302

  16. #16

    Default

    Quote Originally Posted by Mustang-junky View Post
    Flowmaster doesn't have any mufflers that look like that in their catalog now. Just didn't want you to get ripped off. The look more like DynoMax bullet mufflers which are much cheaper than Flowmasters.

    Jess
    Yeah, googling it the welds don't look right. I don't mind, they did a great job and I think they were a little embarrassed at the time they spent working on it. They charged me a very reasonable amount for a full dual setup (600$ parts included)

  17. #17

    Default

    hmmm... they are not bullets. Welds really don't look right comparing those two. Now I am curious. They may have been sitting on his shelf for quite a while too.
    Last edited by emerygt350; 10-09-2017 at 07:53 PM.

  18. #18

    Default

    The 3721 edelbrock intake manifold is going on next week. Right now she will do 0-60 in 8 seconds. We will see how much of a difference the intake makes. After that I believe I am going to put 3.73s in the rear. All with the CFI on it.

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