2.25 Primarys too big for 523 SCJ?

Are 2.25 Primarys too big for 523 SCJ with a xr292 roller? I can get a really good deal on some stainless 2.25 tubing but if its too big to keep velocity up on a 523 inch Scj headed motor i dont know if i wanna do it. THanks

just depends what its going in and indended use..............

05 mustang street/strip, 3500 lbs, 4r70w with 3500 stall. mostly street car though

My vote is they are bigger than you need, it will run better with 2 inch.........

It's bigger than it needs to be per the application...but it may not matter a lot depending on the intake manifold , carb and cam..........it's a package

"package"

Well right now the package is just a 523 FRPP crate with out of the box SCJ's and the A-514 mechanical roller.Its got a motorsport victor intake on it and the plan is to put a xr292 or similar cam in it and leave myself a little room to have the heads ported down the road. Thats pretty much the "package". Thanks

If your buying headers get 2" or 2 1/8"

Im making the headers myself, the rest of the exhaust is 3 in. through mufflers all the way to the back of the car

With having an exhaust I'd be even more enclined to use the smaller tube.

I went 5.60's at 3000 lb with 2 inch primary's. 557 inch 861 hp.

ya im not looking for that much speed right now. Im not trying to push using the 2.25 and know the i dont need that big, I can just get the tubing alot cheaper in 2.25 than i can in 2 or 2.125, the real question was if the velocity drop would be too much and would the power/torque difference between them large enough to absolutely not use the 2.25. If it is i'll go smaller and move on. THanks

It will lose torque in the 3500 rpm range of your converter, and probably won't gain it back up top with the combo you have now.

It's not going to break the bank, but it won't be as good as it could be.

But it will sound great................. Go for it.

poweredbyford wrote:ya im not looking for that much speed right now. Im not trying to push using the 2.25 and know the i dont need that big, I can just get the tubing alot cheaper in 2.25 than i can in 2 or 2.125, the real question was if the velocity drop would be too much and would the power/torque difference between them large enough to absolutely not use the 2.25. If it is i'll go smaller and move on. THanks

You will lose only about 50 to 60 lb/ft of peak torque and more below the peak. With a street vehicle, you probably didn't need it anyway.

rmcomprandy wrote:

poweredbyford wrote:ya im not looking for that much speed right now. Im not trying to push using the 2.25 and know the i dont need that big, I can just get the tubing alot cheaper in 2.25 than i can in 2 or 2.125, the real question was if the velocity drop would be too much and would the power/torque difference between them large enough to absolutely not use the 2.25. If it is i'll go smaller and move on. THanks

You will lose only about 50 to 60 lb/ft of peak torque and more below the peak. With a street vehicle, you probably didn't need it anyway.

haha ok, i'll drop it and just go with 2-2.125, money isnt everything. THanks

The other consideration is packaging and a 2" tube will make header fab a bit easier!