Re: 68 383 Formula S now 411" B with Borg/Warner S480
[Re: CUUDAK]
#905260
01/16/11 12:22 PM
01/16/11 12:22 PM
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Joined: Feb 2003
Posts: 4,953 Houston, Texas
TheOtherDodge
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Houston, Texas
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Sounds like a good build! However, if you could use the room, 5" DP is wayyyy over kill. 4" is plenty. EDIT: I read your link to get the info I was questioning...
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Re: 68 383 Formula S now 411" B with Borg/Warner S480
[Re: TheOtherDodge]
#905261
01/16/11 03:40 PM
01/16/11 03:40 PM
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Joined: Aug 2007
Posts: 475 HEMPSTEAD TX
CUUDAK
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mopar
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HEMPSTEAD TX
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Yeah, I had questioned why on TTF and I was told that if it was meant to have a 4" the flange would have been 4"... Before all is said and done I more than likely will need to convert from the Holley to MSII. Its a real PITA to tune a blow-thru carb. This was supposed to be a budget build. Already over $5000.. If it weren't for the total suspension rebuild due to the disc brake conversion I would be well under the budget. Buuuut, I prefer a good foundation for what I expect from this setup and want to be able to stop! LoL! When I get it running I plan on taking it out to Sealy and see what she does.
SRT8 CHARGER "Four door bore" <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
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Re: 68 383 Formula S now 411" B with Borg/Warner S480
[Re: CUUDAK]
#905262
01/17/11 03:28 PM
01/17/11 03:28 PM
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Joined: Jan 2003
Posts: 28,067 Irving, TX
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Senior Management
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Posts: 28,067
Irving, TX
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When building your manifolds keep the log no larger than necessary. When a small primary dumps into the big pipe velocity will drop. A 3" log may be a bit large.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: 68 383 Formula S now 411" B with Borg/Warner S480
[Re: TheOtherDodge]
#905264
01/18/11 12:14 AM
01/18/11 12:14 AM
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Joined: Oct 2010
Posts: 66 Reno, NV
Wilde Racing
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Reno, NV
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Quote:
Sounds like a good build! However, if you could use the room, 5" DP is wayyyy over kill. 4" is plenty.
EDIT: I read your link to get the info I was questioning...
I disagree, I logged back pressure and seen a near 1:1 ratio with my s475/5inch down pipe.... It's all about pressure differential....
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Re: 68 383 Formula S now 411" B with Borg/Warner S480
[Re: Wilde Racing]
#905265
01/18/11 01:44 AM
01/18/11 01:44 AM
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Joined: Aug 2007
Posts: 475 HEMPSTEAD TX
CUUDAK
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HEMPSTEAD TX
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Quote:
Quote:
Sounds like a good build! However, if you could use the room, 5" DP is wayyyy over kill. 4" is plenty.
EDIT: I read your link to get the info I was questioning...
I disagree, I logged back pressure and seen a near 1:1 ratio with my s475/5inch down pipe.... It's all about pressure differential....
This is basically what I was told,
All else being equal, _The amount of work that can be done across an exhaust turbine is determined by the pressure differential at the inlet and outlet_ (in English, raise the turbo inlet pressure, lower the outlet pressure, or both, and you make more power) Pressure is heat, heat is pressure.
Raising the inlet pressure is possible, but tough. Lowering the outlet pressure is easy - just bolt on a bigger, free flowing exhaust. I've seen a couple of posts from people who added aftermarket exhausts, who report "my turbo spools up faster now" Well, that's because by lowering the outlet pressure, you increased the pressure differential, and now the exhaust gas can expand more, and do more work. That increased work pushes harder on your turbo, and it spools up faster. You should also see less boost drop at redline, because if an exhaust system is flow-limited, once you pass the flow limit of the system, any additional gasses you try and force through it only raise the outlet pressure. Higher outlet pressure, lower pressure differential, less work, less boost.
[Note that the compressor side comes into play here too - that's another story]
SRT8 CHARGER "Four door bore" <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
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Re: 68 383 Formula S now 411" B with Borg/Warner S480
[Re: CUUDAK]
#905268
01/19/11 11:04 PM
01/19/11 11:04 PM
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Joined: Aug 2007
Posts: 475 HEMPSTEAD TX
CUUDAK
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Worked on it a little today. Here is the T6 flange setup with 2 threes merging,
SRT8 CHARGER "Four door bore" <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
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Re: 68 383 Formula S now 411" B with Borg/Warner S480
[Re: CUUDAK]
#905270
01/22/11 11:50 PM
01/22/11 11:50 PM
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Joined: Aug 2007
Posts: 475 HEMPSTEAD TX
CUUDAK
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Got a half a day in these. They ain't very pretty but I think they will do the job. I was concerned about the top pipes angle into the log but it is what it is!! That very first hole may be an issue too. But it will all fit under the stock hood, even with the 5" DP. I can get to all the header nuts and sparkplugs either from the bottom or through holes in the apron. Still need a bit more time in the square end at the flange.
Anyhow here are a few pics of the pipeline facility!!
SRT8 CHARGER "Four door bore" <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
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Re: 68 383 Formula S now 411" B with Borg/Warner S480
[Re: CUUDAK]
#905274
01/24/11 05:53 PM
01/24/11 05:53 PM
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Joined: Jan 2003
Posts: 28,067 Irving, TX
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Senior Management
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Posts: 28,067
Irving, TX
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My logs were made from the same stuff and I have issues with cracks.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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