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  1. #1

    Default throttle body/ exhaust mani porting?

    well i have a friend who has a probe gt....ya ya ya i know why am i talking about a probe on a celi forum????


    well i have ridin in his car before and after he modded his throttle body... and it pulls much harder in the upper rpms.... something my car lacks (92 gt 5s)

    i know he swapped his stock TB for a ported one off a 5.0......

    my question is who has ported there factory TB and what were your results?
    what can i expect to gain, if anything?
    is there one off a different car that i could swap that would make a difference?
    also i was bouncing the idea of porting my exhaust mani in my head....

    im looking for the "free" power mods. nothing too extravagant just enough to make a difference and shift the powerband a lil higher....since after all it is only just a 300 dollar car after all

    looking for thoughts, comments, concerns, or anything else related to this area.

    thanks for your help guys...

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  2. #2
    Mustang Crew Grot has much to be proud of Grot has much to be proud of Grot has much to be proud of Grot has much to be proud of Grot has much to be proud of Grot has much to be proud of Grot has much to be proud of Grot has much to be proud of
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    im fairly sure that the 5.0 TB fits on our cars as well.

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    Originally Posted by Murgatroy
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  3. #3

    Default

    With minor adaptation, yes.

    But i believe you want a 7mgte throttle body, since i think the TPS matches.

    Will you see a difference? Probably not. The main reason why this engine doesn't breathe up top is because of the head design, not the throttle body.

  4. #4

    Default

    hmm... thanks for the insight. ill have to further investigate this now.

    what all would have to be adapted on the 5.0? tps i think?

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    [4thgenceli] I nutswung earlier and left a deposit in the wife's cooter

  5. #5

    Default

    Yes, you'd need to rewire the tps and do whatever to make the voltage right. The 7mgte tb just needs an adapter.
    If you search the user name partyball in the for sale forum he has a 5.0 tb project for sale.

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  6. #6

    Default

    hmm... thanks for that ill def look into it.

    i have a buddy ( dude with the probe) that i might pick up his. he says it was bored to 65mm.... but the blade doesnt seal right. so if its salvageable i might pick his up....

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    [4thgenceli] I nutswung earlier and left a deposit in the wife's cooter

  7. #7

    Default

    Actually, I'm picking up that project.

    I'm thinking about throwing it on the 3SFE in my vert.

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  8. #8

    Default

    :/ oh well i prefer do do my own mods any how

    best of luck to ya and keep us updated.

    anyone ever port the exhaust mani? or is that just a waste of time? lol

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  9. #9
    Mustang Crew Grot has much to be proud of Grot has much to be proud of Grot has much to be proud of Grot has much to be proud of Grot has much to be proud of Grot has much to be proud of Grot has much to be proud of Grot has much to be proud of
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    just buy a header.

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    Originally Posted by Murgatroy
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  10. #10
    Lifetime Member joe's gt is a glorious beacon of light joe's gt is a glorious beacon of light joe's gt is a glorious beacon of light joe's gt is a glorious beacon of light joe's gt is a glorious beacon of light joe's gt's Avatar
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    Default

    Quote Originally Posted by ciento44
    With minor adaptation, yes.

    But i believe you want a 7mgte throttle body, since i think the TPS matches.

    Will you see a difference? Probably not. The main reason why this engine doesn't breathe up top is because of the head design, not the throttle body.
    I agree with this completely. Your head is the limiting factor here, as is on most n/a engines. Bigger throttle body will yield more in the upper rpm, but only as much as your head can flow, which is why you probably won't notice a huge difference.
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  11. #11

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    ua that was kinda my thought on the header..... i was just looking for the "free" power mod lol

    ya N/A sucks..... but oh well

    think i might talk to some other people that might have the TB and see what the deal is with it as roman - dude with the probe told me it was basically useless since it leaked so bad it made it have a 1200 rpm idle

    i do not want that

    thanks for the insigh/ help guys

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    [4thgenceli] I nutswung earlier and left a deposit in the wife's cooter

  12. #12

    Default

    Quote Originally Posted by ciento44
    The main reason why this engine doesn't breathe up top is because of the head design, not the throttle body.
    Quote Originally Posted by joe's gt
    Your head is the limiting factor here, as is on most n/a engines. Bigger throttle body will yield more in the upper rpm, but only as much as your head can flow, which is why you probably won't notice a huge difference.
    That is a myth. The fact the a 5sfe doesn't breath well into the higher RPMs has very little to do with the actual head design. I have seen dynos showing them breath just fine right up to 8500rpms. Mine breaths good up to 7000rpms currently but I still have the stock throttlebody and intake manifold. The things that keep the 5sfe from breathing into the higher rpms are:

    1) Cams (#1 by a long shot)
    2) Intake manifold
    3) Exhaust manifold
    4) Exhaust system
    5) Throttlebody and intake
    6) Valve size (no one has ever taken one up to where this was the limiting factor)
    7) Valve angle and chamber design (again not one has ever taken one up to where it actually makes a big difference as far as I have ever seen)

    Something else people need to realize is that the 5sfe is a bigger engine. That requires that you run more agressive cams to get the torque into the same RPMs as you would with a smaller motor. That extra displacement shifts the torque to the left from the start and you have to pull it right again if you want your upper RPMs to be strong. The 5sgte guys run into the same problems where they have shifted the torque left and must do things to shift it right again.

  13. #13
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    Default

    Quote Originally Posted by Lonestag
    Actually, I'm picking up that project.

    I'm thinking about throwing it on the 3SFE in my vert.
    Be sure to keep us updated. I'm waiting until I build my rev 2 head to upgrade mine, but it would be interesting to see how it performs on the stock motor.

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  14. #14

    Default

    Quote Originally Posted by a_mounty
    ya N/A sucks..... but oh well
    Not for everybody.
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  15. #15

    Default

    Quote Originally Posted by MrTurrari
    That is a myth. The fact the a 5sfe doesn't breath well into the higher RPMs has very little to do with the actual head design. I have seen dynos showing them breath just fine right up to 8500rpms. Mine breaths good up to 7000rpms currently but I still have the stock throttlebody and intake manifold. The things that keep the 5sfe from breathing into the higher rpms are:

    1) Cams (#1 by a long shot)
    2) Intake manifold
    3) Exhaust manifold
    4) Exhaust system
    5) Throttlebody and intake
    6) Valve size (no one has ever taken one up to where this was the limiting factor)
    7) Valve angle and chamber design (again not one has ever taken one up to where it actually makes a big difference as far as I have ever seen)

    Something else people need to realize is that the 5sfe is a bigger engine. That requires that you run more agressive cams to get the torque into the same RPMs as you would with a smaller motor. That extra displacement shifts the torque to the left from the start and you have to pull it right again if you want your upper RPMs to be strong. The 5sgte guys run into the same problems where they have shifted the torque left and must do things to shift it right again.
    Hrmmm..... So the throttle body and port matching the manifolds will help significantly, then?

  16. #16

    Default

    If you have a new set of cams, I would assume Tb and port matching would have a noticable effect.

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    But i still love her...

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  17. #17

    Default

    doing the TB woundt yield a whole lot but it would to a point help some...or atleast that was my school of thought, hence this thread.

    also what is your definition of significantly? 1-5 hp or 50 hp? if its 50 then no 1-5 then prolly yes.

    im not sure exactly on how much it would make. i just dont want to feel the power drop off after 5300 rpm..... it gives me a rather narrow power band from 3-5300 ish.

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  18. #18

    Default

    Throttle body only won't do much for that. It WILL help throttle response, though.

  19. #19

    Default

    Quote Originally Posted by ciento44
    Hrmmm..... So the throttle body and port matching the manifolds will help significantly, then?
    Not by themselves. The 5sfe can use a bigger TB once you start making power up past the stock redline. Port matching the manifold helps a little but unless you make it bigger up the whole runner length you will only be making small gains.

    My list is in order of the effect they will have on power. The stuff lower down does very little until you are really pushing the limits.

  20. #20

    Default

    There was a company in Calif that I heard of some time back but cant remember the name that would take weird shaped manifolds and such and used an abrasive type clay that they forced through the passages to open them up and polish them. This might be a solution to porting the intake side behind the tb to the head, then port match the runner to the head. Wait, I think its coming to me, "Exude Hone". Could be. Check it out.

  21. #21
    Lifetime Member joe's gt is a glorious beacon of light joe's gt is a glorious beacon of light joe's gt is a glorious beacon of light joe's gt is a glorious beacon of light joe's gt is a glorious beacon of light joe's gt's Avatar
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    ^^ yup. Its called extrude honing. I don't think its cheap tho.
    - Shadow's Minion Army - Grand Inquisitor -

    This has been the best and most frustrating experience of my life. I thank my dad for all the help he has given me in this rare restoration. Now that the car is done, I wouldn't trade it for the world.

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