1 7/8 header to big on 408 - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 20 Old 10-16-2012, 09:01 PM Thread Starter
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1 7/8 header to big on 408

gonna be making my turbo exhaust. are 1 7/8 to big or just right? it's going on a fordstrokers dart 408 9.0.1comp w/ afr 225 58cc and bw480s turbo. looking to make 900+ rwhp through a th400. gonna have dual tial mvs 38mm wastegates, 83lbs, super vic efi, accufab 4 barrel throttlebody and prob a/w under dash intercooler. all this on a aem ems. what size cross pipe should i run 2 1/2'', 3''?


92 white lx notch, FS dart 408, bw s480 turbo, 1&2 th400, super vic, afr 225,csu750, custom 1 7/8 headers, dual tial 38mm wg
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post #2 of 20 Old 10-17-2012, 05:23 PM
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For that power level I'd certainly not pay extra for that sized header. 1 5/8 is enough.


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post #3 of 20 Old 10-17-2012, 06:50 PM
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For that power level I'd certainly not pay extra for that sized header. 1 5/8 is enough.


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Neggitory lol. Get the big stuff. I ran headers like that on my ls1 when it had bolt ons. People wondered why I trapped 125 mph on the kit with an exhaust only. More cubes can deal with less exhaust restriction.
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post #4 of 20 Old 10-17-2012, 07:03 PM
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For a stated 900rwhp goal I disagree. We ran 1 5/8 on our old 408 and made a little more than that goal and since the rest of the combination was not really up to more power then would not matter had we had bigger headers and possibly made more power. I do know bigger headers would though ran us a bit more money though.

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post #5 of 20 Old 10-17-2012, 10:39 PM Thread Starter
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i got a box of 1 7/8''mistake bent tubes, header flanges and collectors for $365 shipped to my house from stahl. i think i can't go wrong for that price

92 white lx notch, FS dart 408, bw s480 turbo, 1&2 th400, super vic, afr 225,csu750, custom 1 7/8 headers, dual tial 38mm wg
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post #6 of 20 Old 10-23-2012, 12:04 PM
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A 15/8 header on AFR225 exhaust port dont think that is gone to work real well. I would put no smaller pipe then the port size. But thats me.

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post #7 of 20 Old 10-23-2012, 12:38 PM
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I had TFS TW-R heads with a ton of work to them and huge ports. I insisted that I needed headers with tubes big enough to clear them but no one at the time made any off the shelf ones. Finally after I talked to some very experience and reputable turbo kit builders I opted for 1 5/8 like they said would work. That car with a 347 made around 1200fwhp which also was the limit of the turbos and fuel system.

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post #8 of 20 Old 10-24-2012, 02:39 PM
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A 15/8 header on AFR225 exhaust port dont think that is gone to work real well. I would put no smaller pipe then the port size. But thats me.
X2 on that..

I read a very long thread on Yellowbullet and the consensus by people smarter and more experienced than I is that you want to run a header primary size that would be the minimum for what you'd want naturally aspirated. On your combo, Id say about 1-3/4", but you got a deal on 1-7/8" pipe, that'll probably be just fine.
Primary size should match the port size. Id be curious to see the drive pressure and reversion that was going on in Snipes TFS-R heads with 1-5/8" headers.

As for the cross over, Id probably stick to 2-1/2. You can get to a pretty high power level with that. Depends on the radius of your bends too though and how youre placing the turbo.

The concern I see is the S480. A 408 is pretty big for that turbo, I hope you have a large turbine and a large A/R. You may want to step up those 38mm W/G's to something larger or you may run into drive pressure/over speed issues..

Just my .02, but I only know what Ive read.. Id be real interested in seeing how it works out. Good luck!


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post #9 of 20 Old 10-24-2012, 02:57 PM
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Actually.. I just remembered you can get two turbine wheels (that I know of) on the S480, an 83mm or a 96mm... Do you know which you have?

The 96mm would probably work out ok..


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post #10 of 20 Old 10-25-2012, 12:58 PM
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Quote:
Originally Posted by snipe656 View Post
I had TFS TW-R heads with a ton of work to them and huge ports. I insisted that I needed headers with tubes big enough to clear them but no one at the time made any off the shelf ones. Finally after I talked to some very experience and reputable turbo kit builders I opted for 1 5/8 like they said would work. That car with a 347 made around 1200fwhp which also was the limit of the turbos and fuel system.
Didn't say they would not work just. Just not what I would do the exhaust hits a big enough block when it hits the turbo.


Turbo 306,How fast will it go that depends on who is around.. Local parts pimp.. Things for sale most stuff is OBO https://docs.google.com/document/d/1hvqaA8aKICIw6BBj3IU2KCwiv86TtWXmxmvrsd8lw1A/edit?hl=en_US&pli=1#
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post #11 of 20 Old 10-25-2012, 03:16 PM
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I would run a 1 5/8" or 1 3/4" primary on that motor.


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Originally Posted by 19935.slow View Post
Neggitory lol. Get the big stuff. I ran headers like that on my ls1 when it had bolt ons. People wondered why I trapped 125 mph on the kit with an exhaust only. More cubes can deal with less exhaust restriction.

Turbos and nitrous are worlds apart, as far as what exhaust they like.

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post #12 of 20 Old 10-25-2012, 04:10 PM
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Didn't say they would not work just. Just not what I would do the exhaust hits a big enough block when it hits the turbo.
My point all along was that with the stated power goal it would be fine with the "smaller" tubing and I'd not go bigger if it were to cost me a bit more money. There is the 100% optimal combo and then the one that costs less but meets the goal.


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post #13 of 20 Old 10-25-2012, 07:21 PM
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^^^ agreed. Understand what you are saying. Just not the way I would do it LOL..

Turbo 306,How fast will it go that depends on who is around.. Local parts pimp.. Things for sale most stuff is OBO https://docs.google.com/document/d/1hvqaA8aKICIw6BBj3IU2KCwiv86TtWXmxmvrsd8lw1A/edit?hl=en_US&pli=1#
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post #14 of 20 Old 10-27-2012, 07:28 PM Thread Starter
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i have the 96mm wheel and 1.32 AR. i just hope the twin 38 mvs gates will be enough. this setup should be pretty badass if it comes out like i want it. but it won't be done till nxt season. i plan on making a build thread

92 white lx notch, FS dart 408, bw s480 turbo, 1&2 th400, super vic, afr 225,csu750, custom 1 7/8 headers, dual tial 38mm wg
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post #15 of 20 Old 10-28-2012, 12:35 AM
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1 5/8 will make 1000rwhp+. Have a customer doing it on the same size engine and pump gas w 205's. Over 1100rwhp on 1 3/4 necked down from a 1 7/8 port.
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post #16 of 20 Old 10-28-2012, 07:52 AM
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I just had a custom turbo kit built for my car and its a 427W with ported Victor Jr. heads, 9.2:1 and will be running a Precision 101 with 66mm wastegate and its 2 inch primary and 3 inch cross over. Im wanting to make a little more power than 900 though. This is what was said would be best. Id say the 1 3/4 inch would work perfect.
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post #17 of 20 Old 10-28-2012, 09:29 AM Thread Starter
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my min goal is 900rwhp. hopefully i can break the 4 digits w/o a problem. turbo is good up to 1250hp. so what about x-over pipe. someone said 2 1/2 and another 3. will my 83lbs be enough for 1000hp otherwise i'll have to searching for bigger.

92 white lx notch, FS dart 408, bw s480 turbo, 1&2 th400, super vic, afr 225,csu750, custom 1 7/8 headers, dual tial 38mm wg
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post #18 of 20 Old 10-28-2012, 03:10 PM
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Id say atleast 120's
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post #19 of 20 Old 10-28-2012, 06:46 PM Thread Starter
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i guess i'll just have to wait and find out if i make my 900 goal with 83's then i can eventually upgrade

92 white lx notch, FS dart 408, bw s480 turbo, 1&2 th400, super vic, afr 225,csu750, custom 1 7/8 headers, dual tial 38mm wg
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post #20 of 20 Old 10-29-2012, 10:17 AM
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Quote:
Originally Posted by kiswoc View Post
i have the 96mm wheel and 1.32 AR. i just hope the twin 38 mvs gates will be enough. this setup should be pretty badass if it comes out like i want it. but it won't be done till nxt season. i plan on making a build thread
Sweeeet, Im very curious how this works out. I have a 10 to 1 427 and Id like to put an 88 on it to do some local 275 races.
If you happen remember, shoot me a PM with a link to your build thread, Id really appreciate it.

Good luck!


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GOOD FRIENDS DON'T LET YOU DO STUPID THINGS, ALONE
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