M112 Installation, FAQ, & Discussion
Reverse Gear Member
Joined: Dec 2006
Posts: 8,130
From: Baton Rouge, LA
I've been doing a good bit of math here tonight, out of boredom. I've figured out all the ratios for all available underdrive pulleys and all available s/c overdrive pulleys.
It seems that with a 42% a 2.93 and even a 2.76 overdrive pulley can be safey used on an all-stock 3.8. Running a 2.76 upper with a 42% lower will net an additional .445" of hood clearance and a 2.93 will net .36" of additional clearance. it may not sound like much, but I think it's a pretty big difference combined with the newest supecharger plates.
I have to wait until to I get home to run everything through the simulators, but it looks like a 2.93 on a 42% UDP will net around 11psi with NO trailoff in boost or efficiency, and a 2.76 with a 42% will have VERY slight inefficiency @ 2500rpm.
I'm looking at some other option, as it seems that with either a Whipple 140AX or 170AX body we can reduce the amount of overall hood clearance and increase the efficiency while also completely taking of any heat issues.
When I get a chance to run my simulations and account for a ton of other variables, I'm gonna see if there is a possibly of manufacturing my own custom supercharger JUST for our application with the ability to increase boost levels safely and efficiently.
It seems that with a 42% a 2.93 and even a 2.76 overdrive pulley can be safey used on an all-stock 3.8. Running a 2.76 upper with a 42% lower will net an additional .445" of hood clearance and a 2.93 will net .36" of additional clearance. it may not sound like much, but I think it's a pretty big difference combined with the newest supecharger plates.
I have to wait until to I get home to run everything through the simulators, but it looks like a 2.93 on a 42% UDP will net around 11psi with NO trailoff in boost or efficiency, and a 2.76 with a 42% will have VERY slight inefficiency @ 2500rpm.
I'm looking at some other option, as it seems that with either a Whipple 140AX or 170AX body we can reduce the amount of overall hood clearance and increase the efficiency while also completely taking of any heat issues.
When I get a chance to run my simulations and account for a ton of other variables, I'm gonna see if there is a possibly of manufacturing my own custom supercharger JUST for our application with the ability to increase boost levels safely and efficiently.
6th Gear Member
Joined: Dec 2004
Posts: 15,865
From: Ludlow, Mass
my neighbor owns an autobody shop but he quote me $400 which I thought was a bit high. I dont want to get it done at like macco though. I love the looks of the SVT hood. So I was thinking maybe I can find a used one but wait till i find it in my color, then sell my old hood for $200 to make some money back .
5th Gear Member
Joined: Sep 2006
Posts: 2,528
From: New Braunfels, Texas
IMO if you are going to upgrade the lower intake then you might as well take out the IMRC's. I don't remeber who it was but when his IMRC's opened his smooth dyno graph started getting really choppy, and he said that his tuner was having problems tuning around the IMRC's.
6th Gear Member
Joined: Nov 2008
Posts: 5,453
From: RI
he did say something about a tri-coat, I dont know much about paint but I assume thats the same thing lol. I have the same color as you I'm 99% sure but I thought it was "torch red" or is that the same thing just different name.
6th Gear Member
Joined: Nov 2008
Posts: 5,453
From: RI
It depends how well the engine has been taken care of or not. If not it probably wont handle the compression too well. I think a compression test is the best way to tell but ask some of these guys who know more.