2.25 Primarys too big for 523 SCJ?

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2.25 Primarys too big for 523 SCJ?

Post  poweredbyford on November 5th 2012, 3:05 pm

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

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Re: 2.25 Primarys too big for 523 SCJ?

Post  richter69 on November 5th 2012, 4:05 pm

just depends what its going in and indended use..............
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Re: 2.25 Primarys too big for 523 SCJ?

Post  poweredbyford on November 5th 2012, 4:21 pm

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

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Re: 2.25 Primarys too big for 523 SCJ?

Post  IDT-572 on November 5th 2012, 10:17 pm

My vote is they are bigger than you need, it will run better with 2 inch.........
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Re: 2.25 Primarys too big for 523 SCJ?

Post  Lem Evans on November 5th 2012, 11:35 pm

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 Idea

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Re: 2.25 Primarys too big for 523 SCJ?

Post  richter69 on November 6th 2012, 12:54 am

"package"
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Re: 2.25 Primarys too big for 523 SCJ?

Post  poweredbyford on November 6th 2012, 9:26 am

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

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Re: 2.25 Primarys too big for 523 SCJ?

Post  dfree383 on November 6th 2012, 10:32 am

If your buying headers get 2" or 2 1/8"
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Re: 2.25 Primarys too big for 523 SCJ?

Post  poweredbyford on November 6th 2012, 12:11 pm

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

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Re: 2.25 Primarys too big for 523 SCJ?

Post  dfree383 on November 6th 2012, 12:23 pm

With having an exhaust I'd be even more enclined to use the smaller tube.
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Re: 2.25 Primarys too big for 523 SCJ?

Post  IDT-572 on November 6th 2012, 12:24 pm

I went 5.60's at 3000 lb with 2 inch primary's. 557 inch 861 hp.
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Re: 2.25 Primarys too big for 523 SCJ?

Post  poweredbyford on November 6th 2012, 12:55 pm

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

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Re: 2.25 Primarys too big for 523 SCJ?

Post  IDT-572 on November 6th 2012, 12:59 pm

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................. Cool Go for it.
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Re: 2.25 Primarys too big for 523 SCJ?

Post  rmcomprandy on November 6th 2012, 2:46 pm

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.

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Re: 2.25 Primarys too big for 523 SCJ?

Post  poweredbyford on November 6th 2012, 4:13 pm

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

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Re: 2.25 Primarys too big for 523 SCJ?

Post  466cj on November 6th 2012, 7:38 pm

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

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