Turbo manifold design!
 

Hey guys!
I just have a question regarding designing a Turbo manifold...
I wanted to know if there are any advantages or disadvantages to adding a 3-4 inch pipe in LENGTH at the bottom of the 4 collectors and then bolting the Turbo up
For example picture a Log style manifold and then adding a 4 inch piping coming down and then the Turbo bolting up to the Flange.
Picture it like adding a 4 inch long pipe in length and then the Turbo Bolting Right up to it.
Will this increase Torque becuase of the longer Runner?
I understand having an equal Length manifold would make more sense but just curious if there are any Disadvantages to the design im refering too..
Thanks!

Really are no advantages that I can think of. First, the exhaust coming out of the engine is going to be less hot and less velocity. Your going to take longer to make boost and it won't be as efficient. Granted there won't be a very large difference, but it is present. You'll also run into the added hassle of probably having to run a oil sump, as you move the turbo down your going to need another force other than gravity to move around the oil. Then its going to cost as much money as buying an equal length in the first place to modify a log style to what you want.

Wouldnt there be more velocity? Maybe Im wrong.. I understand, most velocity comes directly from teh engine, but if you have your 4 pipes converging into 1, you would have most of your velocity right there?

<div class='quotetop'>QUOTE (hamhead)</div><div class='quotemain'>Really are no advantages that I can think of. First, the exhaust coming out of the engine is going to be less hot and less velocity. Your going to take longer to make boost and it won't be as efficient. Granted there won't be a very large difference, but it is present. You'll also run into the added hassle of probably having to run a oil sump, as you move the turbo down your going to need another force other than gravity to move around the oil. Then its going to cost as much money as buying an equal length in the first place to modify a log style to what you want.</div>

Well actaully the manifold all the piping and everything is Bolted Up and Fits fine but my Only concern is the long neck.I think it may be about 6 inches if im not mistaken.
So your saying it will take longer for my Turbo to spool up?

Turbos are already mounted after the 4 collectors... adding 3-4 inches to it isn't going to make any difference gas velocity wise.

EDIT: I guess you already did it. I don't see any gains coming from it, but I don't think any losses that might be present will be felt. Just make sure the oil lines (if its oil cooled, most are) get flow there well enough and I don't see any problems coming from it.

<div class='quotetop'>QUOTE (hamhead)</div><div class='quotemain'>Turbos are already mounted after the 4 collectors... adding 3-4 inches to it isn't going to make any difference gas velocity wise.

EDIT: I guess you already did it. I don't see any gains coming from it, but I don't think any losses that might be present will be felt. Just make sure the oil lines (if its oil cooled, most are) get flow there well enough and I don't see any problems coming from it.</div>

Hamhead!
Im not really concerned about really the gains BUT more of a NOT having any disadvantages.
Everything right now Bolts up 100% incuding the Oil lines but i was ONLY concerned on the neck issue
If there WILL be any LITTLE restriction will this cuase the Turbo to spool later or really something that wont be felt
Im aiming for about 250WHP
Thanks

LOL, I = stupid today, cut me a tad bit of slack. tongue.gif For what your shooting for, I don't see it making any difference you can feel. It should be fine. The turbo is going to get slightly longer to spoolup most likely, but its not going to be a horrible design. I might compare it to using a mild steel manifold in comparison to stainless steel. The SS is going to make more power because it insulates and keeps in heat better, but its not a huge difference.

<div class='quotetop'>QUOTE (hamhead)</div><div class='quotemain'>LOL, I = stupid today, cut me a tad bit of slack. tongue.gif For what your shooting for, I don't see it making any difference you can feel. It should be fine. The turbo is going to get slightly longer to spoolup most likely, but its not going to be a horrible design. I might compare it to using a mild steel manifold in comparison to stainless steel. The SS is going to make more power because it insulates and keeps in heat better, but its not a huge difference.</div>

Well i might hit up to 300WHP tongue.gif
Besides if the Turbo is going to take a bit longer to spool up how muh are we talking about 200Rpms later to hit full boost?
Better yet i will crank the boost up 1-2 psi and then wont be noticeable:-)
What you think!
Thanks Bro!

Probably more around ~100 more to hit full. Good luck with your turbo. smile.gif

I think I know what you mean 2UNIQ, but hamhead is fully right IMO. The more length there is, the longer the heat has to travel, therefore the possiblility of losing heat is greater. And obviously the heat helps turn the turbine.

On the other hand, if there is NO collector joined to the pipes coming off the exhuast ports, it would be a good idea.