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Supercharged Foxes, I have a Q for you

2K views 19 replies 8 participants last post by  Trojan Horse 
#1 ·
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
 
#4 ·
That's what I'm trying to figure out.
Whether or not the vacuum accessories will even work.
 
#6 ·
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
 
#10 ·
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.
 
#11 ·
svtlx said:
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!
 
#12 ·
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.
 
#14 ·
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.
 
#17 ·
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.
 
#18 ·
:cool: Thank you for the info. :good::good:
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. :D
 
#19 ·
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.
 
#20 ·
:cool: I appreciate you sharing your info and sources with me. :good:
 
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