[lilbobcummin03]

Ok here's the dealo, I'm wanting twins but I'm having the ol headache of what manifold would work better. So far I have a BD T3 3 piece on a Bw screaming eagle and I want to throw an S480 under it here soon. Now should I stay T3 or should I go ahead and get a Steed Speed T4 and a T4 63/68/14? I know I already have a manifold and such but if the T4 will be better than I'm willing to sacrifice for something better. Any advise would help. And if anything I can always sale what I have.

 

[lilbobcummin03]

To me it seems a T4 would be better cus the S480 is a T6 so to me that would work better together than a T3. Right?

 

[Chevokeeman]

Right on! The Steedspeed manifold is a work of art and the T-4 flange is used by most that do twins. Chevokeeman.

 

[blackdieselram]

Id go with a t4. More flow is better.

 

[Woosley]

T4 will get more out of the setup.

 

[jsf350]

use what you have- as long as you port the t3 to match the turbo housing you will be good

 

[TURBOLVR]

and the T-4 flange is used by most that do twins. .

95% of street trucks are T3 based.
FYI- The T4 is larger, so it will flow more on the top-end, but as usual, will sacrifice the velocity that spools off the bottom end.

-Joel has it right. :thumbsup: Port the T3 and enjoy.

 

[lilbobcummin03]

I figuared it would be ether or lol. Should I worry much about drive pressure with the T3? I am willing to sale my Mani and Turbo to get something that would make a difference in performance and longivety. It would suck though cus I only have 2K on my set up now

 

[TURBOLVR]

Just smooth the one you have and port match it to the turbo and engine (and gaskets).

 

[82ndsnpr]

95% of street trucks are T3 based.
FYI- The T4 is larger, so it will flow more on the top-end, but as usual, will sacrifice the velocity that spools off the bottom end.

-Joel has it right. :thumbsup: Port the T3 and enjoy.

95% off all twins i see on the cummins engine are using a second gen t4 manifold......

 

[TURBOLVR]

since when??

There wasnt even a T4 option until recently

 

[82ndsnpr]

maybe things are done different in TN but i stand by what i have said i have yet to see a twin setup that is t3 setup unless its a stocker kit

 

[Capt. Slow]

Mine is a t3. I was told by Johnny Gilbert that they do t4 as an option for the guys that go for 900+ hp.

 

[cumminalong]

T3 is pretty much the common setup.

If you think you'll have issues with a T3, all the numbers in my sig are on a T3 flanged manifold.

 

[TURBOLVR]

maybe things are done different in TN but i stand by what i have said i have yet to see a twin setup that is t3 setup unless its a stocker kit

Must be you?
I've done kits for folks all over this country and others.
90% T3 based secondary.
Source, Wicked, Poole, II, DPS, BD, ect. ALL T3 based kits. :confused013:
Take a gander through the twin pic threads, most are T3 secondary there too.:thumbsup:

 

[82ndsnpr]

all kits are t3 based but all the kits i have seen have been done with t4 weather it is a option the owner chose to do or the kit was designed to be used with a t4. the only t3 kits i have seen have a stock turbo in them.

 

[jsf350]

ever actually talk to a company that makes t3 and t4 manifolds?
i have.... they made the t4 to fit turbos that have the larger housing.... but there is no difference in a t4 vs porter to match t3 to turbo

i was ready to spend the $$$ on a t4 manifold and t4 housing and was told to save my $$$

just my .02

 

[cumminalong]

I have yet to to see a T4 flanged kit unless it was a spec'd setup.

Most of the common kits are T3 secondary into a T4 primary until you start going 480's or larger.

 

[stuntjake]

since this thread is pretty much answered, may i side track it and ask whats a safe port job thickness at 1600*? I have ported all my own stuff for years, but i never want to over due it, like taking down my material to thin allowing for cracks at high temps cycles.

 

[82ndsnpr]

I have yet to to see a T4 flanged kit unless it was a spec'd setup.

Most of the common kits are T3 secondary into a T4 primary until you start going 480's or larger.

these are the majority of the kits i have seen they are set up just like you say