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Old 06-01-2012, 06:22 PM   #51
amoosenamedhank
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Basically someone with a 2.25" exhaust and an intake needs to get on the rollers
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Old 06-01-2012, 06:24 PM   #52
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Quote:
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Basically someone with a 2.25" exhaust and an intake needs to get on the rollers
Indeed!
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Old 06-01-2012, 06:38 PM   #53
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I concur some one else get on the dyno lol
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Old 06-01-2012, 06:49 PM   #54
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I would love to get with Top Speed again to see if they would be interested in dynoing my car again; they did my car with the stock intake and then I put the Injen on at the dyno to see what it gained, results are in my sig.
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Old 06-01-2012, 06:52 PM   #55
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Quote:
Originally Posted by Bwill9886 View Post
Correct on the front one (40842S)
My rear is 40364.



While back pressure is important, I've always thought the bigger concern with exhausts is what I like to call the "flow vs. velocity ratio." Simply put, the best combination of flow and velocity = the best gains. You are able to move the most exhaust gases you can at the highest rate.

Go too big, you have the ability to move a lot of exhaust gases, but not at an optimal rate. Go too small, and you're getting the exhaust gases out more quickly, but at a lower volume than you could.

I bet there are a couple reasons most companies went with 2.25" and I suspect cost, familiarity (other stock, N/A 4 cyl. use that size, why not this?), and potentially higher stock gains play the biggest roles. It's all speculation though until someone asks. I'd love to know and I could very well be proven wrong.

I would, however, bet heavily that in a competition between 2.5" and 2.25" with a header, intake, and a tune that 2.5" will net you more power (whp AND I'll go ahead and bet wtq as well). I of course could be proven wrong and that's fine, but looking at other newer N/A 4 cylinders in similar "situations" tells me otherwise.
I agree with the theory; I have to believe that Ford and the aftermarket companies know what they are doing and that is why they went with the 2.25 diameter tubing; I can't say as I agree that 2.5 tubing would gain any more power as tuning a modern day NA car comes down to timing, a/f ratio and fuel, none of which I think would be affected from a 2.5 exhaust.
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Old 06-01-2012, 06:56 PM   #56
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I would love to get with Top Speed again to see if they would be interested in dynoing my car again; they did my car with the stock intake and then I put the Injen on at the dyno to see what it gained, results are in my sig.
148 hp/132 tq are your numbers with the intake?! If that's the case, Red made the same hp and 11 lb/ft tq more stock...
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Old 06-01-2012, 07:23 PM   #57
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He also has the dct auto trans and I have a five speed so he is going to have less TQ
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Old 06-01-2012, 09:40 PM   #58
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Quote:
Originally Posted by greg hazlett View Post
I agree with the theory; I have to believe that Ford and the aftermarket companies know what they are doing and that is why they went with the 2.25 diameter tubing; I can't say as I agree that 2.5 tubing would gain any more power as tuning a modern day NA car comes down to timing, a/f ratio and fuel, none of which I think would be affected from a 2.5 exhaust.
Sounds like you need to get on the dyno when tuning becomes available and prove me wrong then!







Did my peer pressure work?
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Old 06-01-2012, 09:42 PM   #59
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Basically someone with a 2.25" exhaust and an intake needs to get on the rollers

Werd.
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Old 06-01-2012, 09:43 PM   #60
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148 hp/132 tq are your numbers with the intake?! If that's the case, Red made the same hp and 11 lb/ft tq more stock...

Different dyno, different day. His total gains over stock will be what counts.
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