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Old 09-30-2011, 09:27 AM   #1
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Supercharged Foxes, I have a Q for you

I was thinking about the upcoming installation of my Paxton supercharger and it suddenly struck me....

If you pressurize your intake system, What happens to your vacuum operated accessories?

Do I need to put a one way check valve on all my vacuum ports to prevent the pressurizing of my vacuum system components?

Thanks,
TH
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Old 09-30-2011, 09:43 AM   #2
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I cant see it hurting to do it as a procoshionary messure but depending on ur boost lvl u may not need to
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Old 09-30-2011, 11:35 AM   #3
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I thought about that as well and found a vacuum pump from MU that sounded like a sound investment if you would still like to run power brakes and things like that!
Not sure how well it works but you should check it out?!
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Old 09-30-2011, 12:43 PM   #4
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Re: Supercharged Foxes, I have a Q for you

That's what I'm trying to figure out.
Whether or not the vacuum accessories will even work.
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Old 09-30-2011, 01:48 PM   #5
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I believe they make a vacuum reservoir tank for high lift cams and supercharged applications.

---------- Post added at 01:48 PM ---------- Previous post was at 01:43 PM ----------

Like this,
http://m.summitracing.com/parts/SUM-G1464
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Old 09-30-2011, 03:15 PM   #6
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I've heard conflicting story's about it so sorry I can't be of any help on the matter other that to say I would buy the pump because even if you arent running a lot of boost to start out, I'm quite sure it wouldn't take long to have the urge to up it and lose all vacuum to the accessories!

---------- Post added at 03:15 PM ---------- Previous post was at 03:14 PM ----------

But again, that's just what I would do as a failsafe
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Old 09-30-2011, 04:54 PM   #7
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Re: Supercharged Foxes, I have a Q for you

had a Paxton on my 88GT .never had a problem ,,,,,,,
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Old 09-30-2011, 05:06 PM   #8
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http://en.m.wikipedia.org/wiki/Manifold_vacuum
http://www.mustangsandmore.com/ubb/F...ML/013781.html

Here is some good info for ya.
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Old 09-30-2011, 08:55 PM   #9
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Re: Supercharged Foxes, I have a Q for you

Not quite the same thing, but my 88 turbo coupe was running 15-18 psi from the turbo and I never had problems. And, to my knowledge, they don't have anything of that sort.
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Old 10-01-2011, 11:21 AM   #10
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Re: Supercharged Foxes, I have a Q for you

at 11psi of boost, and .529 lift ive never had that problem... brakes worked fine, as well as vent controls and wut not. nor do i run a vacuum reserve tank. i think you will be fine.

i dont think vaccum would be an issue until u get into .600 plus lift cams regardless of the amount of boost your running.
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Old 10-01-2011, 11:28 AM   #11
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Quote:
Originally Posted by svtlx
at 11psi of boost, and .529 lift ive never had that problem... brakes worked fine, as well as vent controls and wut not. nor do i run a vacuum reserve tank. i think you will be fine.

i dont think vaccum would be an issue until u get into .600 plus lift cams regardless of the amount of boost your running.
That's good to know!
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Old 10-01-2011, 08:32 PM   #12
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Re: Supercharged Foxes, I have a Q for you

Thanks to everyone for your comments, information and suggestions.

Even though it doesn't seem to affect them as negatively as I thought it might, I still think I am going to at least install check valves on the vacuum ports.
Going to positive pressure that is several times higher in comparison to the vacuum being developed just has to have an adverse effect on the vacuum operated accessories. So, I will do this for piece of mind if nothing else.
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Old 10-01-2011, 10:41 PM   #13
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Hey TH, just for *hits and giggles how much boost you plan on running?

Does anyone know if these same theries apply to carbed motors. I would think so but I don't know.
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Old 10-02-2011, 03:31 AM   #14
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Re: Supercharged Foxes, I have a Q for you

Quote:
Originally Posted by dreamstang View Post
Hey TH, just for *hits and giggles how much boost you plan on running?

Does anyone know if these same theries apply to carbed motors. I would think so but I don't know.
Probably 8-12 psi, maybe more.
DSS claims 600+ HP is possible with their main girdle system.
I am adding the Valley Girdle Pro too and planning on testing their claims if everything goes well.
I'm currently researching a mini pc that I can mount in the car to work with the PMS to monitor and data log.

I think the theories would apply to a carbed engine just as well.
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Old 10-02-2011, 11:26 AM   #15
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Re: Supercharged Foxes, I have a Q for you

Quote:
Originally Posted by Trojan Horse View Post
Probably 8-12 psi, maybe more.
DSS claims 600+ HP is possible with their main girdle system.
I am adding the Valley Girdle Pro too and planning on testing their claims if everything goes well.
I'm currently researching a mini pc that I can mount in the car to work with the PMS to monitor and data log.

I think the theories would apply to a carbed engine just as well.
so ur doin a standard stroke motor or stroker, i cant remember.

also, i bought sum procomp mls head gaskets for 68 buks shipped for the set, not a piece. just thrown it out there cause u will need sum for you boosted build. the cheapest ones at jeg's are 72buks a piece
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Old 10-02-2011, 12:52 PM   #16
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Re: Supercharged Foxes, I have a Q for you

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Originally Posted by svtlx View Post
so ur doin a standard stroke motor or stroker, i cant remember.

also, i bought sum procomp mls head gaskets for 68 buks shipped for the set, not a piece. just thrown it out there cause u will need sum for you boosted build. the cheapest ones at jeg's are 72buks a piece
Standard stroke 306.

Thanks for the info on the gaskets. I'll probably end up needing a set before it all over. Where did you buy them, from ProComp?
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Old 10-02-2011, 01:45 PM   #17
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Re: Supercharged Foxes, I have a Q for you

yup, there's a few vendors on ebay. not hard to find. ur lookn at 18-25psi if u want 500-600 on a standard stroke. not to mention ur n intercooler territory too around 16.5-17psi.
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racing aod, 2700 stall, 3.42 gears, ported e7, 308ci, 1.7rr, comp .560valve springs, gear drive, high dwell module, msd 6a & coil, bbk off road xpipe, mac cat back, 30lbs inj, pro-m 90mm, welded subframe connectors, boxed upper & lower trailing arms, spherical axle bushings, 255/50/16 tires, 255lph pump, 456hp
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Old 10-02-2011, 02:33 PM   #18
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Re: Supercharged Foxes, I have a Q for you

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Originally Posted by svtlx View Post
yup, there's a few vendors on ebay. not hard to find. ur lookn at 18-25psi if u want 500-600 on a standard stroke. not to mention ur n intercooler territory too around 16.5-17psi.
Thank you for the info.
I don't trust some vendors on eBay, due to prior experiences.
Which one did you or have you used?

The engine makes 405 at the crank as is. (Dynoed by Keith Craft Racing)
I am adding numerous parts, 60 psi injectors, fuel pump, fuel line improvements, fuel rails, larger TB, larger MAF, MSD dist & ignition, methanol injection and tuning with a PMS.
Hopefully I can get it done lower than 25 psi.
The Paxton is good for 20-22 psi I think.
If not then so be it, I'll just do what I can and let er' rip.
It will be fun while it lasts whatever the outcome.

If it blows, I have a 351W waiting to be poked and stroked to 408 or 427 CI.
That should do the trick easily.
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Old 10-02-2011, 05:57 PM   #19
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Re: Supercharged Foxes, I have a Q for you

Quote:
Originally Posted by Trojan Horse View Post
Thank you for the info.
I don't trust some vendors on eBay, due to prior experiences.
Which one did you or have you used?

The engine makes 405 at the crank as is. (Dynoed by Keith Craft Racing)
I am adding numerous parts, 60 psi injectors, fuel pump, fuel line improvements, fuel rails, larger TB, larger MAF, MSD dist & ignition, methanol injection and tuning with a PMS.
Hopefully I can get it done lower than 25 psi.
The Paxton is good for 20-22 psi I think.
If not then so be it, I'll just do what I can and let er' rip.
It will be fun while it lasts whatever the outcome.

If it blows, I have a 351W waiting to be poked and stroked to 408 or 427 CI.
That should do the trick easily.
kmj performance... search "302 mls gaskets". i ve bought lotsa stuff from them. btw, they are 54buks a set shipped now!

ive had a few bad experiences as well...
wutever u do..dont buy sequentials from "pmsteddy" if a sequential board breaks, he wont return emails nor replace the warrentied item.

anyway, ive bought my blower, rocker arms, 2 stangs, numerous sets of drilled/slotted rotors, tons of h.i.d/l.e.d.. stuff, 2 intakes, lift kit, shocks. long story short.... i wouldnt be able to afford the stang hobby without ebay. i rarely pay "brick and morter" retail.

seems like u got your stuff together.
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bbk ssi, 70ml t.b., bbk adj.reg., bd11-a 11psi, e-cam,
racing aod, 2700 stall, 3.42 gears, ported e7, 308ci, 1.7rr, comp .560valve springs, gear drive, high dwell module, msd 6a & coil, bbk off road xpipe, mac cat back, 30lbs inj, pro-m 90mm, welded subframe connectors, boxed upper & lower trailing arms, spherical axle bushings, 255/50/16 tires, 255lph pump, 456hp
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Old 10-02-2011, 06:10 PM   #20
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Re: Supercharged Foxes, I have a Q for you

I appreciate you sharing your info and sources with me.
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