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Thread: What effects can I expect from swapping a Mustang HO intake with the stock T-Bird.

  1. #11
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    Quote Originally Posted by 87tbird_org_owner View Post
    I've been considering swapping out the 87 T-Bird 5.0L stock upper intake, throttle body and EGR with that from a 87 Mustang 5.0L HO. That will be going from 50mm opening to 65mm. Has any one ever tried this or have just upgraded to an aftermarket 65mm setup? If you have done this what effects/results were achieved?
    Actually that will be going to 60mm, no 5.0 Stang had a 65mm TB stock... The opening in a SO upper is approx 60mm, the 200Hp '86 HO used this intake with a 58mm throttle body...

    As others have stated you'll get more performance with headers and true duals than the intake swap... All that's beneficial on top end would be the 60mm TB & EGR spacer... At that point either go big(full HO) or leave it alone...






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  2. #12
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    My car did well with Mustang upper and tb. The power increase wasn't huge, but it was noticeable. I was conditioned to the stock car and no experience with any other vehicle at that time (it was my first car). I believe it simply leaned out a rich factory WOT mixture a tiny bit, which shoots for around 11.6:1 AFR for 100% gasoline. I didn't do any other work until the entire motor was swapped out years later - stock exhaust, heads, etc.

    When working with only ~150hp and the limited acceleration you get, small increases are noticeable. Going from 150hp to 160hp (not saying this is what to expect) could feel like a much bigger increase than going from 400hp to 450hp.

    I don't think I'd notice a small power increase today. Upper intake and silencer is a cheap update to make though - you can get them for $20. Electric fan is another easier swap that can help free up power and increase fuel economy, but I had a (Mark VIII) fan failure within the first year, leaving me without active cooling.

  3. #13
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    Actually that will be going to 60mm, no 5.0 Stang had a 65mm TB stock... The opening in a SO upper is approx 60mm, the 200Hp '86 HO used this intake with a 58mm throttle body...
    Now that you mention that you're right, 65mm was an aftermarket upgrade.

    Magazine articles always talk about the Mustang and those changes but nothing for a T-Bird. I was just not sure that the stock ECM in the T-Bird could handle changes.

    Other changes I've made in the past are as follows:
    >Removed air silencer in early 90's and have a KN filter.
    >Replace stock exhaust in 95 when it rotted out with the Borla Turbo Coupe 2.5" stainless steel of that time ( No longer sold ). Wanted stainless steel and if I recall there were no Mustang stainless systems at that time. To get it to work it only required a custom bent pipe between Cat and Borla pipe.
    >Changed rockers to 1.7 ratio in 98 hoping to gain some extra hp but did not notice any extra.
    >Had to replace Cat in 2005 when car failed EPA pollution test. Discovered the inside of Cat was hollow. Now since my state only tests cars with the OBII I am free to do whatever changes my wallet allows.

    Have never felt any hp increase with any of those changes. So I was thinking that either the stock intake or exhaust manifolds is holding back power gains. ( Heads are a big change for me. ) I know if I went with shorty headers I'd have to get Mustang duals because of difference in the exhaust connections. So I'm thinking of changing to the upper HO and since the lower manifold is the same on either engine.

    Ford did a disservice when it limited the standard 5.0 engine in T-Bird to 150HP. When I bought the car back in 87 every dealer I went too was always asking more than MSRP on the TC just because of the 190HP. I remember they never allowed a test drive either on the TC. I wonder what 190HP or more feels like in the T-Bird? Probably twisted the hell out of the body because the body on my car has about a 1" twist in it.

  4. #14
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    GT40 Explorer intake and TB are 65mm. If you're going to start swapping stock parts for performance, I'd completely skip over HO parts, except the HO cam and EEC. The GT40 heads are good, and actually breathe, and even the Explorer variant intake runs within 10% of the flow (when ported) of the best the aftermarket has to offer, and offers more low end torque than anything.
    1988 Thunderbird 5.0
    GT40P, TFS-1, KB domes, 30#, MAF conversion, Explorer GT40 Upper/Lower, Smog delete, Wide Ratio AOD Mod, Unlocked Speedo, 3G Charging System Upgrade, Hi-Torque Mini Starter, 3.73 LSD, BBK 1 5/8 unequal headers, H-Pipe.

    88 Thunderbird/Cougar EVTM
    (Thanks to Trinom for hosting)

  5. #15
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    Quote Originally Posted by TheFoeYouKnow View Post
    GT40 Explorer intake and TB are 65mm. If you're going to start swapping stock parts for performance, I'd completely skip over HO parts, except the HO cam and EEC. The GT40 heads are good, and actually breathe, and even the Explorer variant intake runs within 10% of the flow (when ported) of the best the aftermarket has to offer, and offers more low end torque than anything.
    At this time my funds are limited and the HO TB/EGR, Upper intake are parts I have on hand.

  6. #16
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    Quote Originally Posted by 87tbird_org_owner View Post
    I wonder what 190HP or more feels like in the T-Bird? Probably twisted the hell out of the body because the body on my car has about a 1" twist in it.
    LOL 190Hp isn't going to twist anything... I've hit mine with 125/150Hp shot of nitrous for aprox 440Hp total, still sets level...






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  7. #17
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    Quote Originally Posted by TurboCoupe50 View Post
    LOL 190Hp isn't going to twist anything... I've hit mine with 125/150Hp shot of nitrous for aprox 440Hp total, still sets level...
    From what I've found about fox body cars you're very fortunate to still have a level car.

  8. #18
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    I have e5 heads ho intake and tb ho headers 2.5" exhaust no smog or egr and the engine runs great

  9. #19
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    Quote Originally Posted by Moonmount View Post
    I have e5 heads ho intake and tb ho headers 2.5" exhaust no smog or egr and the engine runs great
    You've got WAY too much exhaust for those heads, that cam, and 14# injectors. You're probably giving up power having such large piping. A Mark VII 2" H-pipe would probably make more power with your combo, especially at low RPM.
    Or, go full HO swap (heads, cam, injectors, EEC) and be just a little excessive.
    Think of it like trying to blow out a candle while blowing through a 2" pipe that's 2 feet long. You lose so much velocity, that you can't get the work done. The same task with a 1/2 or 3/4 inch tube would be successful. Exhaust gas has inertia, so if you keep the velocity up by using appropriate size tubing, the momentum of the exhaust in the pipe will help to evacuate new exhaust from the ports (and cylinder) with greater efficiency by creating a lower pressure area at the port. It's called cylinder scavenging, and overkill is a thing.
    1988 Thunderbird 5.0
    GT40P, TFS-1, KB domes, 30#, MAF conversion, Explorer GT40 Upper/Lower, Smog delete, Wide Ratio AOD Mod, Unlocked Speedo, 3G Charging System Upgrade, Hi-Torque Mini Starter, 3.73 LSD, BBK 1 5/8 unequal headers, H-Pipe.

    88 Thunderbird/Cougar EVTM
    (Thanks to Trinom for hosting)

  10. #20
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    Yeah I know, I had and have a lot planned for the car. I have 3.73 gears, worked e7 heads, a 95 gt cam and plenty of other parts sitting in storage. But I hit a massive deer with my daily and combined with job issues and the sad fact that 3/4 slip super bad I kinda just gotta live with it at the moment. :/

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