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Author
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Topic: Supercharger boost
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castor
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Member # 2765
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posted
 
 
Is it correct to say that if my boost guage is connected to the vacuum tree on the firewall right behind the steering wheel, that's "intake boost" and it reads lower than connecting it to the outlet of the unit itself?
If so, then connecting to the output will give me a more accurate reading?
Thanks in advance. ![[patriot]](graemlins/patriot.gif)
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SOLD!!! 7/07
Supercharged 92GT
352rwhp [old blower w/3 1/2lbs]
???rwhp w/S-Trim
2010 Acura MDX Tech/Entertainment
2013 Acura TL SH-AWD
Posts: 1457 | From: San Francisco | Registered: Apr 2003
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Rob [5LVENOM]
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Member # 2282
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posted
Any manifold vacuum source will give an accurate reading.
Posts: 421 | Registered: Jan 2003
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white1990stang
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Member # 2307
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posted
i connected mine to the fitting on the tb. you know where the hose from the valve cover oil fill to the tb went. i used an adapter like the one used right behind the gauge to connect the line and a 2 inch piece of rubber hose.
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You must be fast, cause I was haullin ass when I passed you.
Posts: 1308 | From: martinez | Registered: Jan 2003
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66 AC COBRA
Nitrous King
Member # 904
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posted
yeas and no, if u had 500 90's bends iun ur system, and the blower saw 50psi, but the intake only saw 8psi, what would u tune the car for
8psi
obviously that is exagerated but it demostrates my point
boost is not power, just a restriction, so where do u want to measure that, where the motor is sucking it in or where the blower is spitting it out
and think of it think way, either u will make 352rwhp at 8psi referenced at the manifold or 352rwhp at 11psi referenced at the blower ![[Razz]](tongue.gif)
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FFR AC Cobra
72 Vega - WCHRA Extreme 10.5
Posts: 6280 | From: Winters | Registered: Feb 2002
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castor
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Member # 2765
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posted
quote:
Originally posted by 66 AC COBRA:
yeas and no, if u had 500 90's bends iun ur system, and the blower saw 50psi, but the intake only saw 8psi, what would u tune the car for
8psi
obviously that is exagerated but it demostrates my point
boost is not power, just a restriction, so where do u want to measure that, where the motor is sucking it in or where the blower is spitting it out
and think of it think way, either u will make 352rwhp at 8psi referenced at the manifold or 352rwhp at 11psi referenced at the blower
Thanks for the great info. Only reason I'm asking is because from the tree, I only see about 3 1/2lbs. of boost at about 5k plus RPMs. My blower is older, rated from the factory at 5-6lbs of boost, but when it was rebuilt, the modified impeller was added at a rating of 1-2lbs of additional boost, if memory serves me correct. The unit in question is a Paxton SN2000.
Thanks, all.
--------------------
SOLD!!! 7/07
Supercharged 92GT
352rwhp [old blower w/3 1/2lbs]
???rwhp w/S-Trim
2010 Acura MDX Tech/Entertainment
2013 Acura TL SH-AWD
Posts: 1457 | From: San Francisco | Registered: Apr 2003
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Fostang
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Member # 3752
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posted
quote:
Originally posted by castor:
quote:
Originally posted by 66 AC COBRA:
yeas and no, if u had 500 90's bends iun ur system, and the blower saw 50psi, but the intake only saw 8psi, what would u tune the car for
8psi
obviously that is exagerated but it demostrates my point
boost is not power, just a restriction, so where do u want to measure that, where the motor is sucking it in or where the blower is spitting it out
and think of it think way, either u will make 352rwhp at 8psi referenced at the manifold or 352rwhp at 11psi referenced at the blower
Thanks for the great info. Only reason I'm asking is because from the tree, I only see about 3 1/2lbs. of boost at about 5k plus RPMs. My blower is older, rated from the factory at 5-6lbs of boost, but when it was rebuilt, the modified impeller was added at a rating of 1-2lbs of additional boost, if memory serves me correct. The unit in question is a Paxton SN2000.
Thanks, all.
Yup thats the right amount of boost your seeing. 3.5 pounds possibly 4 just because of the boost not getting efficiently read from the vacuum tree.
[ October 04, 2004, 05:24 PM: Message edited by: Fostang ]
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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castor
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Member # 2765
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posted
quote:
Originally posted by Fostang:
quote:
Originally posted by castor:
quote:
Originally posted by 66 AC COBRA:
yeas and no, if u had 500 90's bends iun ur system, and the blower saw 50psi, but the intake only saw 8psi, what would u tune the car for
8psi
obviously that is exagerated but it demostrates my point
boost is not power, just a restriction, so where do u want to measure that, where the motor is sucking it in or where the blower is spitting it out
and think of it think way, either u will make 352rwhp at 8psi referenced at the manifold or 352rwhp at 11psi referenced at the blower
Thanks for the great info. Only reason I'm asking is because from the tree, I only see about 3 1/2lbs. of boost at about 5k plus RPMs. My blower is older, rated from the factory at 5-6lbs of boost, but when it was rebuilt, the modified impeller was added at a rating of 1-2lbs of additional boost, if memory serves me correct. The unit in question is a Paxton SN2000.
Thanks, all.
Yup thats the right amount of boost your seeing. 3.5 pounds possibly 4 just because of the boost not getting efficiently read from the vacuum tree.
Thanks...anyone else?
--------------------
SOLD!!! 7/07
Supercharged 92GT
352rwhp [old blower w/3 1/2lbs]
???rwhp w/S-Trim
2010 Acura MDX Tech/Entertainment
2013 Acura TL SH-AWD
Posts: 1457 | From: San Francisco | Registered: Apr 2003
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66 AC COBRA
Nitrous King
Member # 904
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posted
i never said that the vaccumm tree was a good place for reference
i woulkd want that gauge directly off the intake manifold
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FFR AC Cobra
72 Vega - WCHRA Extreme 10.5
Posts: 6280 | From: Winters | Registered: Feb 2002
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