my n/a supercharging project complete
Thread Starter
Senior Member
Joined: Oct 2002
Posts: 644
Likes: 1
From: scranton nd
here are some answers to some questions you guys had
The m90 is off of a t-bird, the m-90 from a grand prix has part of the intake cast onto the s/c and it is way too big
The engine pad i am talking looks something like this
red-the actual bracket coming from the engine(made out or aluminum
black-the actual round (steel) pad that sits on a rubber stub or like a pilliar
blue-is the bolt attaching the pad to the engine bracket
brown- is a peice of 3/8" steel i welded to the pad, the rest of the upper bracket is welded to this peice
green- is where i welded on the backside of the pad , in the crease where the pad and steel peice meet
yellow- yellow is where i welded on top of the pad
does this pic help at all?
The pulley i had machined at a place where they rebuild electric motors. I went there because since the s/c has a straight shaft just like electric motors and not a tapered one i figured he could set me up with some thing. All he had to do was drill the shaft hole out slightly and cut a different sized key into a pulley he had on hand.
The piping and clamps and elbows came from a local filter shop for little to nothing
The m90 is off of a t-bird, the m-90 from a grand prix has part of the intake cast onto the s/c and it is way too big
The engine pad i am talking looks something like this
red-the actual bracket coming from the engine(made out or aluminum
black-the actual round (steel) pad that sits on a rubber stub or like a pilliar
blue-is the bolt attaching the pad to the engine bracket
brown- is a peice of 3/8" steel i welded to the pad, the rest of the upper bracket is welded to this peice
green- is where i welded on the backside of the pad , in the crease where the pad and steel peice meet
yellow- yellow is where i welded on top of the pad
does this pic help at all?
The pulley i had machined at a place where they rebuild electric motors. I went there because since the s/c has a straight shaft just like electric motors and not a tapered one i figured he could set me up with some thing. All he had to do was drill the shaft hole out slightly and cut a different sized key into a pulley he had on hand.
The piping and clamps and elbows came from a local filter shop for little to nothing
Thread Starter
Senior Member
Joined: Oct 2002
Posts: 644
Likes: 1
From: scranton nd
ok, usually superchargers are placed after the throttle plates(like a picture shown on like page 6 of this thread), but i put mine before it(alot less fabing), Most cyntrifugal s/c's are piped like mine and use a bypass valve.
u need a bypass valve because when u shift , or even at idle the bypass valve opens because the throttle plates are blocking the air flow and a huge boost spike is created, The bypass valve is opened either by vacuum(when the engine is at idle) or when too much boost is created and and the excess pressure pushes open the valves plunger(shifting)
At first i just wanted to use an open atmoshere blowoff valve but that would screw up my computer since it is mass air metered and at idle it would vent air to the atmosphere and not recycle it back into the system.
The one bypass valve i have cant vent the excess pressure fast enough at high rpm shifts but it works perfect at idle. I plan to hook up the blow off valve i ordered with out the vacuum line attached to it so that it will only open when too much pressure is present and not at idle. If i cant get the blow off valve to work properly ill just buy another bypass valve and hook it up just like the one i have on it right now, i know two would be more than sufficient.
I got the bypass valve for $12 shipped to my place off of ebay
As for timing i am not worring about it since i havnt had any predetination
I found the idler at my place, it is a peice of **** and an eye soar, so i have a nice new smaller one on the way
u need a bypass valve because when u shift , or even at idle the bypass valve opens because the throttle plates are blocking the air flow and a huge boost spike is created, The bypass valve is opened either by vacuum(when the engine is at idle) or when too much boost is created and and the excess pressure pushes open the valves plunger(shifting)
At first i just wanted to use an open atmoshere blowoff valve but that would screw up my computer since it is mass air metered and at idle it would vent air to the atmosphere and not recycle it back into the system.
The one bypass valve i have cant vent the excess pressure fast enough at high rpm shifts but it works perfect at idle. I plan to hook up the blow off valve i ordered with out the vacuum line attached to it so that it will only open when too much pressure is present and not at idle. If i cant get the blow off valve to work properly ill just buy another bypass valve and hook it up just like the one i have on it right now, i know two would be more than sufficient.
I got the bypass valve for $12 shipped to my place off of ebay
As for timing i am not worring about it since i havnt had any predetination
I found the idler at my place, it is a peice of **** and an eye soar, so i have a nice new smaller one on the way
Rotary Enthusiast
Joined: Oct 2002
Posts: 1,165
Likes: 0
From: California, Bay Area
Originally posted by SonicRaT
Wire the VDI open once and see how it goes, as far as I am aware by design it opens up two shorter paths, and as it looks it leaves the others alone.
Wire the VDI open once and see how it goes, as far as I am aware by design it opens up two shorter paths, and as it looks it leaves the others alone.
Joined: Dec 2001
Posts: 10,630
Likes: 3
From: NY, MA, MI, OR, TX, and now LA or AZ!
Originally posted by drago86
This is not true, the air still travels the longer path, the valve just opens a shorter acoustic path for the pressure waves to travel down, opening it will just loose low end super charged or not.
This is not true, the air still travels the longer path, the valve just opens a shorter acoustic path for the pressure waves to travel down, opening it will just loose low end super charged or not.
Weird Cat Man
Joined: Aug 2001
Posts: 2,868
Likes: 3
From: A pale blue dot
I'd LOVE to see what this puppy does on a dyno for inclusion on my dyno page:
http://www.catenet.net/dyno.php
http://www.catenet.net/dyno.php
great job dude. i was gonna do this almost exactly to my na i had in high school, but i couldnt find the t-bird sc cheap enough, then i had a little incident with a tree...glad to see i wasnt the only one with this idea..whish i could ride in it and see how i would have been...
oh well..i just built a high comp TII..which is kinda similar.
oh yeah...you might wanna switch to a serpentine belt setup. you should be able to find pulleys for everything except the waterpump at a good junkyard. the waterpump you'll have to get custom made, tho. should make it all a lot simpler and more reliable/less slippage.
i had a couple more suggestions, but i totally forgot em...oh well
ps..all you writeup people...why? he has explained it really well, and what he has done is very simple when it comes down to it. part of the coolness of **** like this is that it takes someone with a bit of ingenuity like zach to do it. if you cant figure it out from whathe has told you already, maybe itd be better for you to not do it. takes away from the prestige of the real engineers that figure stuff out for themselves.
just my .02
pat
oh well..i just built a high comp TII..which is kinda similar.
oh yeah...you might wanna switch to a serpentine belt setup. you should be able to find pulleys for everything except the waterpump at a good junkyard. the waterpump you'll have to get custom made, tho. should make it all a lot simpler and more reliable/less slippage.
i had a couple more suggestions, but i totally forgot em...oh well
ps..all you writeup people...why? he has explained it really well, and what he has done is very simple when it comes down to it. part of the coolness of **** like this is that it takes someone with a bit of ingenuity like zach to do it. if you cant figure it out from whathe has told you already, maybe itd be better for you to not do it. takes away from the prestige of the real engineers that figure stuff out for themselves.
just my .02
pat
Full Member
Joined: Sep 2003
Posts: 76
Likes: 0
From: victoria
All I have to say is that i'm insanely impressed with your
inginuety and fabbing skills, this is definetly on my to do list when I get the time. You have to try to take some better pics or draw up something more clear to describe how you mounted it etc... MUCH PROPS MAN!!!
inginuety and fabbing skills, this is definetly on my to do list when I get the time. You have to try to take some better pics or draw up something more clear to describe how you mounted it etc... MUCH PROPS MAN!!!
