boost and headers
Thread Starter
Drifting
Joined: Feb 2007
Posts: 1,961
Likes: 1
From: Dubai
boost and headers
well just installed the boost gauge recently, with catless kooks, and a free flowing exhaust, my boost dropped from the Vortech advertised 6.5PSI to sub 5, am guessing about 4.9PSI @ max revs (7000 RPM) does this sound right? 
Racer
Joined: Jan 2003
Posts: 284
Likes: 0
From: Tacoma WA
What happens here is the s/c with the pulley it came with stock is design to support advertised power/boost on a stock engine. Once you improve the efficently the exhaust back pressure drops and the boost falls off. To make the most of your upgrade you will need to speed up the blower.
Burning Brakes
Joined: Jul 2005
Posts: 779
Likes: 2
From: Bloomingdale Illinois
The increased flow with the headers is what is causing the drop to 5psi.
You are making the same power with less boost.
Time for a smaller supercharger pulley to take advantage of your headers and bring your boost back up to 6.5psi.
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Perry
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Le Mans Master
Joined: Mar 2006
Posts: 7,838
Likes: 1
From: Valencia '32 Ford 3 window with 615 HP!!!!
St. Jude Donor '06-'09
What happens here is the s/c with the pulley it came with stock is design to support advertised power/boost on a stock engine. Once you improve the efficently the exhaust back pressure drops and the boost falls off. To make the most of your upgrade you will need to speed up the blower.
Same happened to Mine with My Maggie and headers!!
Take care Al!!
Thread Starter
Drifting
Joined: Feb 2007
Posts: 1,961
Likes: 1
From: Dubai
What happens here is the s/c with the pulley it came with stock is design to support advertised power/boost on a stock engine. Once you improve the efficently the exhaust back pressure drops and the boost falls off. To make the most of your upgrade you will need to speed up the blower.
Im not sure if a procharger pulley would work, guesses?
thanks alot man
Racer
Joined: Oct 2007
Posts: 392
Likes: 0
From: Smyrna Delawere
thanks alot for the explanation, I guess thats what I need to do
Hey Perry, problem is there isnt any pulley smaller than 4.5 that would yeild a 1-1.5 increase in boost, the next pulley on the line is a 3.8 which is way small
Im not sure if a procharger pulley would work, guesses?
thanks alot man
Hey Perry, problem is there isnt any pulley smaller than 4.5 that would yeild a 1-1.5 increase in boost, the next pulley on the line is a 3.8 which is way small
Im not sure if a procharger pulley would work, guesses?
thanks alot man
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Racer
Joined: Oct 2007
Posts: 392
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From: Smyrna Delawere
Melting Slicks
Joined: Sep 2004
Posts: 3,287
Likes: 1
From: Union City CA
Can you PM me once you purchase the 4.10 pulley and install it? Do you need to change the current pulley belt with the smaller 4.10 pulley? By the way, where do you see the information on the 4.10 pulley? On their site, all they have is 3.80 and 4.50 pulley. Thanks
Last edited by csun213; Dec 12, 2007 at 11:15 PM.
Racer
Joined: Oct 2007
Posts: 392
Likes: 0
From: Smyrna Delawere
I was just wondering because cartek told i would loose boost with headers but make super charger more eficient. so I thought I was to safe to raiseback up to at say 6 1/2 pounds so I called and its a new item dont hold me to it I think belt is with it
Last edited by RICKEY BOBBY; Dec 13, 2007 at 12:14 AM.
Thread Starter
Drifting
Joined: Feb 2007
Posts: 1,961
Likes: 1
From: Dubai
man you might be able to make that much power, but the engine wont be able to handle it. I am also thinking of a blower cam, but im woring on fixing the bad surging first, and I instially loved the idea that the car would drive just like stock. I think ill switch to a smaller pulley, fix the tune and call it done.
If I mod the car, ill change the rear-end ratio.
Melting Slicks
Joined: Sep 2004
Posts: 3,287
Likes: 1
From: Union City CA
Just got off the phone with Vortech and they told me that they don't make a 4.10 pulley and have no plans on making one.
Andy from A&A does have a 4.00 pulley however because he has a different mounting bracket than Vortech, not sure how the belt from A&A would fit.
Andy from A&A does have a 4.00 pulley however because he has a different mounting bracket than Vortech, not sure how the belt from A&A would fit.
Racer
Joined: Oct 2007
Posts: 392
Likes: 0
From: Smyrna Delawere
I hope the person I spoke with new what he was talking about he took my credit card info and said it would ship same day. Do you have a Zo6
Racer
Joined: Oct 2007
Posts: 392
Likes: 0
From: Smyrna Delawere
They may not have one for C 6 I have 07 zo6 and they pulled my order My buddie is sponserd by vortech and he hooked me up with his rep. east coast super charger also does custom sizes
Melting Slicks
Joined: Sep 2004
Posts: 3,287
Likes: 1
From: Union City CA
Pro
Joined: Mar 2006
Posts: 658
Likes: 0
From: Pa
They just finished mine. I am having the pulley changed also. My heads/cam/headers barely let the procharger make 5psi. cartek is installing a smaller pulley to up the boost a little.
Racer
Joined: Oct 2007
Posts: 392
Likes: 0
From: Smyrna Delawere
Dave and Julio only did the tune one my car It mad 585 Rwhp and After it had been on the dyno for over an hour in 95 plus heat They are gathering my parts now should in by time there in the new shop Did you do your clutch?
Last edited by RICKEY BOBBY; Dec 13, 2007 at 09:08 PM.
