Supercharged with Wastgate
Thread Starter
Joined: Oct 2007
Posts: 604
Likes: 1
From: Gainesville FL
Supercharged with Wastgate I am building a 408 & using a Novi 2200 supercharger. I am planing to use a wastgate to adjust the boost . What size of wastgate would u use . I plan on pulling it for 18psi and limit it to 6-8 psi for the street .
44mm - 50mm is what I've been told.
Consider a boost controller as well (precise without creep).
I don't have any real world experience yet but I have been researching and in the middle of my own Procharger wastegated build as well.
What I've been told is that you want to keep your ungated potential boost within 5-7 lbs of the gated. If not we risk high IAT's. Your 10lb divergence may not be as efficient as you think. It certainly is worth a try to experiment. You will need meth & big FMIC to pull this off.
Consider a boost controller as well (precise without creep).
I don't have any real world experience yet but I have been researching and in the middle of my own Procharger wastegated build as well.
What I've been told is that you want to keep your ungated potential boost within 5-7 lbs of the gated. If not we risk high IAT's. Your 10lb divergence may not be as efficient as you think. It certainly is worth a try to experiment. You will need meth & big FMIC to pull this off.
11 Second Club
Joined: Nov 2006
Posts: 499
Likes: 0
From: saint louis Missouri
I did it with my procharger setup. Use a cheap ebay wastegate because it will never see any real heat so it won't fail. I used eboost street controller. Had a toggle switch to go between 11psi or 16. It was a lot of fun made great tq. I had fmic and sprayed lots of meth.
I used a hobbs switch and a 4 port solenoid to make my Procharger red race valve function as both a surge valve and boost regulating valve.
A couple other benefits to this method, but for one it eliminates having to buy a wastegate and modify your plumbing to accommodate the wastegate.
A couple other benefits to this method, but for one it eliminates having to buy a wastegate and modify your plumbing to accommodate the wastegate.
Joined: Mar 2007
Posts: 1,145
Likes: 50
From: Saskatchewan, Canada - where arguing "DA" is for the slow and weak...
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I've regulated boost on a procharger using a 4-port solenoid and a typical blow off / surge valve. It works good for low end power if your gearing isn't set up correctly (ie, high gears where the motor isn't wound up enough). However, when bleeding boost off, the power to drive the supercharger goes up significantly.
Bleeding off 3-4 psi at the very top of the rpm band is ok to make use of the low & mid range, but bleeding off 10-12 psi like the OP is stating is going to kill the power up top and be hard on the blower.
A more efficient way of reducing boost is to restrict the inlet side. Try using a smaller air filter or smaller diameter tube going to the inlet of the blower. This will limit the amount of air the blower can suck in, resulting in lower boost at higher blower speeds, but won't result in a huge drive power loss like blowing off compressed air would.
Bleeding off 3-4 psi at the very top of the rpm band is ok to make use of the low & mid range, but bleeding off 10-12 psi like the OP is stating is going to kill the power up top and be hard on the blower.
A more efficient way of reducing boost is to restrict the inlet side. Try using a smaller air filter or smaller diameter tube going to the inlet of the blower. This will limit the amount of air the blower can suck in, resulting in lower boost at higher blower speeds, but won't result in a huge drive power loss like blowing off compressed air would.
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