Best design of Manifold
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From: Boise, Idaho
Originally Posted by slimjim8201,Feb 15 2008, 08:27 AM
The manifold is certainly not tubular inside. I have a hard time believing that it flows any more efficiently than the Inline. From the CAD model I saw, each individual "runner" is forced to bottleneck at a common collector.
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From: Boise, Idaho
Originally Posted by sunhita,Feb 14 2008, 01:22 PM
Can you post some images of the installed turbo, from multiple angles for reviews and comparison?
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Please pardon to my limited knowledge of boosting 
Comparing Tubular Manifold to Inline Manifold:
Tubular: Need only 10-12 PSI to get 380-420 HP.
Inline: Need 20 PSI to get 400 HP.
My questions are:
1. Do not you think big pressure is giving more stress to the manifold and the engine?
2. Do not you think to make 20 PSI is longer than 10-12 PSI (turbo lag)?
3. The higher pressure means hotter to engine?
So..., why Inline manifold is the
and the favorite to you all? By the way, is the crack usually happens due to vibration or pressure of the turbo?
At the end, the manifold may not crack, but the pressure to the engine ....?
Comparing Tubular Manifold to Inline Manifold:
Tubular: Need only 10-12 PSI to get 380-420 HP.
Inline: Need 20 PSI to get 400 HP.
My questions are:
1. Do not you think big pressure is giving more stress to the manifold and the engine?
2. Do not you think to make 20 PSI is longer than 10-12 PSI (turbo lag)?
3. The higher pressure means hotter to engine?
So..., why Inline manifold is the
and the favorite to you all? By the way, is the crack usually happens due to vibration or pressure of the turbo?At the end, the manifold may not crack, but the pressure to the engine ....?
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From: New Jersey
Originally Posted by sunhita,Feb 15 2008, 05:56 PM
Please pardon to my limited knowledge of boosting
Comparing Tubular Manifold to Inline Manifold:
Tubular: Need only 10-12 PSI to get 380-420 HP.
Inline: Need 20 PSI to get 400 HP.
My questions are:
1. Do not you think big pressure is giving more stress to the manifold and the engine?
2. Do not you think to make 20 PSI is longer than 10-12 PSI (turbo lag)?
3. The higher pressure means hotter to engine?
So..., why Inline manifold is the and the favorite to you all? By the way, is the crack usually happens due to vibration or pressure of the turbo?
At the end, the manifold may not crack, but the pressure to the engine ....?
Comparing Tubular Manifold to Inline Manifold:
Tubular: Need only 10-12 PSI to get 380-420 HP.
Inline: Need 20 PSI to get 400 HP.
My questions are:
1. Do not you think big pressure is giving more stress to the manifold and the engine?
2. Do not you think to make 20 PSI is longer than 10-12 PSI (turbo lag)?
3. The higher pressure means hotter to engine?
So..., why Inline manifold is the
and the favorite to you all? By the way, is the crack usually happens due to vibration or pressure of the turbo?At the end, the manifold may not crack, but the pressure to the engine ....?
To answer the questions however,
1. I'm sure its more stressful but thats why you lower your engines compression and get a confident tuner. 5psi could blow an engine if the tuner is an idiot so I wouldn't look at pressure as being the factor for failure.
2. Your talking about tenths of a second between one or the other its not a factor.
3. Again it depends on the tune.
The IP manifold is a favorite for many different reasons. For me, reliability and great customer service is what I wanted. I think its pretty clear IP has both of those going for them
Cracks usually happen to poor manifold design (not enough reinforcement), extreme heat causing the metal to become brittle over time, and vibrations.
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