Hearder tube dia?
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Hearder tube dia?

  1. #1
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    Default Header tube dia?

    Hello, If you where to fab your own headers for a turbo system, what diameter tube would you use? The system would be for a EFI BBC, stock stroke, let's say 15 to 20 psi of boost. What header tube diameter would be recommended? I would think dia. would be critical. Too small, not enough volume. Too big, not enough velocity. Thanks in advance for any input. Be safe. schick
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    Last edited by schick; 08-07-2010 at 08:58 PM. Reason: spelling
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    Senior Member TurboNova's Avatar
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    Default

    Funny but people way over think this one all the time. The collector going into the turbo is more important than the actual header tube. We tried several different designs on my small block with hardly any difference. For tube diameter I would not use anything smaller than the exhaust port to start with. The trend in the last few years has gone more towards similar tube diameters as a NA engine would have. In the end it is all a bottle neck at the turbo anyway. The collector needs to have enough volume to create a pressure drop at the wastegate so you can control boost correctly. The exit angle of the wastegate play a huge role in getting steady boost. Some of your question can't really be answered without knowing what turbos you are running.

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    Default Which turbo?

    I'm open to seggestions' for what turbo's to run. I would like to make max torque between 6-7k for rpm. I see on the form, something in a T4 flange will make boost earlier. This would be for a jet boat application, with 15-20# of boost, aluminum heads, roller cam. ect... .
    Thanks, be safe. schick
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    Senior Member TurboNova's Avatar
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    Default

    Would need a bunch more info to give any advise of what to run, What heads? Exhaust port size? compression, engine size, RPM range, type of fuel? intake? EFI? Carb? What are you doing exactly,

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    Senior Member Hass828's Avatar
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    Quote Originally Posted by TurboNova View Post
    Would need a bunch more info to give any advise of what to run, What heads? Exhaust port size? compression, engine size, RPM range, type of fuel? intake? EFI?Carb? What are you doing exactly,
    Yea, cause EFI or a Carb take an entirely different set of headers





    I'm just f-ckin with you Brian, keep in mind that everything you say on one of these forums will be microanalysed(SP)
    Last edited by Hass828; 08-11-2010 at 07:04 AM.
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    Highaboosta Unchained's Avatar
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    Big turbo's will make huge torque at a low rpm.
    My setup made peak torque at 4800.

    The motor will pull some big gears.
    After we dynoed the motor I switched to 60% gears and that was a huge improvement.
    It actually made the boat easier to ski behind.
    You just put it in gear and ease it up to 2500 rpm and that pulls the skier 35 mph.

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

  9. #7
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    Default Heads, CID, Fuel, Exh size, fuel, EFI, Comp.,

    This is what I have:
    -Aluminum Bow Tie heads, 2.19 int.-1.88 exh. , 110cc combustion
    -Flowed, [email protected]", [email protected]", [email protected]", [email protected]"- on exhaust
    [email protected]", [email protected], [email protected]", [email protected]"- on intake
    -These are the old "D" port exhaust, with the divider in center of the exhaust port.
    -468cid, .250" long rod
    -I'm going to need a single intake with EFI bungs.
    -Looking at 8.5:1 for compression.
    -Pump gas.
    -Looking to lake hot rod. Only want to run 15psi
    -Would like to keep the RPM's close to 6k.


    My question is "did Mark make that much torque at 4800rpm because of his CID. Would an engine with 70 less cubes have trouble turning the same turbo's? Wouldn't I want to go with a smaller set?

    Thank's in advance. Be safe. schick
    Half the people in the world are below average.

  10. #8
    Senior Member Hass828's Avatar
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    Quote Originally Posted by schick View Post
    This is what I have:
    -Aluminum Bow Tie heads, 2.19 int.-1.88 exh. , 110cc combustion
    -Flowed, [email protected]", [email protected]", [email protected]", [email protected]"- on exhaust
    [email protected]", [email protected], [email protected]", [email protected]"- on intake
    -These are the old "D" port exhaust, with the divider in center of the exhaust port.
    -468cid, .250" long rod
    -I'm going to need a single intake with EFI bungs.
    -Looking at 8.5:1 for compression.
    -Pump gas.
    -Looking to lake hot rod. Only want to run 15psi
    -Would like to keep the RPM's close to 6k.


    My question is "did Mark make that much torque at 4800rpm because of his CID. Would an engine with 70 less cubes have trouble turning the same turbo's? Wouldn't I want to go with a smaller set?

    Thank's in advance. Be safe. schick
    Believe it or not those turbos are really to small for his engine and if he were to want-need more power he could go up to a set of S480's or garret GT4788's and make well over 2000hp. Those S475's would be just fine on your 468.
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  11. #9
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    Default Turbos

    So would the S480's or the GT4788's would be too big for a 468? How would enlarging the exhaust valve impact the performance. Seems the exhaust would be the weak link, since it's only benefit is a longer scavenging cycle
    Thanks again, be safe. schick
    Half the people in the world are below average.

  12. #10
    Senior Member Hass828's Avatar
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    Quote Originally Posted by schick View Post
    So would the S480's or the GT4788's would be too big for a 468? How would enlarging the exhaust valve impact the performance. Seems the exhaust would be the weak link, since it's only benefit is a longer scavenging cycle
    Thanks again, be safe. schick
    Your thinking about this the wrong way, you buy the turbos to flow enough lbs per min to produce the power your after, then you size the exhaust turbin to allow the cid-engine to spool it to the desired rpm without choking it off.
    So yes the S480 or 4788's could also work as long as you size the turbin housing correctly and build the bottom end strong enough to withstand the 2000+ hp.
    I will tell you this though, most 468cid engines are built from a production block , and once you get above 1000hp you will begin to walk the main caps at some point, so then you step up to an aftermarket block. Then you might as well go large bore to unshroud the valves for some free hp as well as the added cid. Now you have a 509or a 532 depending on if you went 4.5 or 4.6, then you might as well add the .250 extra stroke while your buying a crank that can stand the 2000hp, now your at a 541cid or a 565 again depending on which bore.

    So, as you see , this can all get out of hand real quick
    "if we keep doing it the same way we always do..we will always get the same results"
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  13. #11
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    Default Size/price

    Ya, it's just like when you build your first performance engine. If your going to do this you need to do that. Before you know it you have doubled your budget.
    There sure is a big difference in price between the BW and the Garrett, WOW.
    I have a 2 bolt. I'm going to splay the center 3 mains with the billet caps. If I can find some outer 4 bolt caps I would convert there also.
    I'm looking for a max torque. I would like to see 1000ftq. I'm not sure if it realistic with a 468? As you know parts are expensive. I will be collecting parts for a while.
    Thanks again, be safe. schick
    Half the people in the world are below average.

  14. #12
    Highaboosta Unchained's Avatar
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    Quote Originally Posted by schick View Post
    -I'm going to need a single intake with EFI bungs.
    -Looking at 8.5:1 for compression.
    -Pump gas.
    -Looking to lake hot rod. Only want to run 15psi
    For the intake an off the shelf Edelbrock Victor EFI manifold is reasonably priced and they have fuel rails available to bolt right on.
    That's what I run. Put a single throttle body on top of it and pipe it to your remote intercooler.
    As far as where you want to run the rpm and boost........
    Once the boost addiction takes hold..........

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

  15. #13
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    Default Boost

    Morning Mark, the boost is addictive I'm sure. I could see it like this, "Well another pound won't hurt. Next pass, another pound won't hurt. And so on till your rods or crank are laying in the bottom of the boat."
    Mark I have a HALTECH E6S-8. Would you have a basic map that I can start with? I think there is a map in it, just looking for back up information in case there is not. I understand I'll have to input them manually.
    Thanks for the heads up on the intake manifold. I've seen tunnel ram intakes on a few set ups. What's the purpose? I thought the runner length was not necessary for fuel atomization, since the injector is just above the intake runner?
    Thanks, be safe. schick
    Half the people in the world are below average.

  16. #14
    Highaboosta Unchained's Avatar
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    I had the E6K, I'm not familiar with the E6S-8
    The E6K was not a V/E based table. There was a different fuel map at 500 rpm increments.

    Send me a link to the E6S-9 program and I'll see how it matches up to what I had. I had maps and datalogs for race gas and E85 with 160 injectors and 3 bar MAP sensor.

    I can't think of any reason for using a tunnel ram manifold for EFI other than that was what was already laying around in the garage.
    It's a time consuming job to machine out and weld in all 8 injector bungs and make your own fuel rails. I have done it before but IMO it is better to buy the manifold and fuel rails already done.
    Last edited by Unchained; 08-14-2010 at 08:54 AM.

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

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