Home
What's new
Latest activity
Authors
Store
Latest reviews
Search products
Forums
New posts
Search forums
What's new
New posts
New listings
New products
New profile posts
Latest activity
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
Cart
Cart
Loading…
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Search titles only
By:
Menu
Log in
Register
Navigation
Install the app
Install
More options
Change style
Contact us
Close Menu
Forums
Cobra Forums
The Terminator
Turbo Cobras
9 Sec Turbo Setup?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="4sdvenom" data-source="post: 8075359" data-attributes="member: 13315"><p>I'll try to keep this as simple as I can and only in regards to compound set-ups.</p><p></p><p>The peak horsepower will be completly dependant on the size of the turbo and the amount of CFM it is capable of flowing. This is because the air has to flow through the turbo before it ever gets to the blower. The turbo does not force air through the blower, in actuality the blower is reducing the backpressure at the discharge of the turbo because the blower moves the air from point A (turbo discharge) to point B blower discharge faster than would normally occure without the blower. This in turn makes the turbo more efficient, and is why you see people mention only 5 psi from the turbo, but it's actually moving the same CFM of air through it as it would at a much higher psi without the blower. The compound set-up also makes the blower more efficient because it is grabbing a fixed volume (PD blowers are constant VOLUME machines) of a higher pressure air than if it was drawing it's own air at whatever elevation your at. Think of it like this.....a PD blower only car at sea level is more efficient with the same pulley ratio than the same car at 6000' elevation in Colorado. Why? because there is a higher pressure air available at the inlet of the blower. The compound set-up works in the same manner, just far more exagerated because you can increase the air pressure at the inlet of the blower in measurements of psi verses measurements of hg. The formula (which I'll add later once I find it again) has you figure the PR for the turbo, and the PR for the blower, multiply those together, and convert back to a PSI for the total psi the motor is seeing.</p><p></p><p>With all that said, I would not put a small single into a compound set-up. Even though the blower makes the turbo more effecient, the turbo still has to spin fast enough to supply the required CFM to make X amount of horsepower, and you will end up pushing the small turbo way past it's efficiency range. They can only spin so fast before the impeller blades lose "traction" with the air and will do nothing but cavitate and heat the air up! For a single turbo in a compound set-up I wouldn't consider anything smaller than a 76mm with a good sized A/R exhaust housing. Personally I would look closer at an 88 or a 91mm turbo for a single compound set-up!</p><p></p><p>Ken:beer:</p></blockquote><p></p>
[QUOTE="4sdvenom, post: 8075359, member: 13315"] I'll try to keep this as simple as I can and only in regards to compound set-ups. The peak horsepower will be completly dependant on the size of the turbo and the amount of CFM it is capable of flowing. This is because the air has to flow through the turbo before it ever gets to the blower. The turbo does not force air through the blower, in actuality the blower is reducing the backpressure at the discharge of the turbo because the blower moves the air from point A (turbo discharge) to point B blower discharge faster than would normally occure without the blower. This in turn makes the turbo more efficient, and is why you see people mention only 5 psi from the turbo, but it's actually moving the same CFM of air through it as it would at a much higher psi without the blower. The compound set-up also makes the blower more efficient because it is grabbing a fixed volume (PD blowers are constant VOLUME machines) of a higher pressure air than if it was drawing it's own air at whatever elevation your at. Think of it like this.....a PD blower only car at sea level is more efficient with the same pulley ratio than the same car at 6000' elevation in Colorado. Why? because there is a higher pressure air available at the inlet of the blower. The compound set-up works in the same manner, just far more exagerated because you can increase the air pressure at the inlet of the blower in measurements of psi verses measurements of hg. The formula (which I'll add later once I find it again) has you figure the PR for the turbo, and the PR for the blower, multiply those together, and convert back to a PSI for the total psi the motor is seeing. With all that said, I would not put a small single into a compound set-up. Even though the blower makes the turbo more effecient, the turbo still has to spin fast enough to supply the required CFM to make X amount of horsepower, and you will end up pushing the small turbo way past it's efficiency range. They can only spin so fast before the impeller blades lose "traction" with the air and will do nothing but cavitate and heat the air up! For a single turbo in a compound set-up I wouldn't consider anything smaller than a 76mm with a good sized A/R exhaust housing. Personally I would look closer at an 88 or a 91mm turbo for a single compound set-up! Ken:beer: [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Cobra Forums
The Terminator
Turbo Cobras
9 Sec Turbo Setup?
Top