I know there is only a few of you guys out there, but I have a couple things I wana do after I get these lifters replaced.

The last things I really wana do to my car are meth and a smaller pulley for the supercharger (MP112)

My tuner says he doesnt really tune for meth(not that he doesnt know how)BUT, He's gonna leave the tune how it already is, but tune the meth in a different "table" I guess. So if my system goes down, it will run how it did without the meth

My question is. What size pulley should I get for my supercharger?

And also, what is the factor for how much RWHP you will gain with each pound of boost?

 

Generally 20hp/lb boost. I would consider the 10% overdriven harmonic balancer kit. It will give you more boost than going to a 2.6 pulley which you have to have custom fabbed (that's how I got mine was $140). This way you can switch to an 8 rib setup at the same time as over driving the supercharger so you can help prevent belt slip.

 

Also consider that is not a linear boost to horsepower ratio as efficiency is another factor.

 

He is tuning using the IAT sensor. If the temps rise (meth failure) then the tune will start pulling timing out. He can also have it dump fuel if the temps rise (meth failure).

You MUST have the fast acting IAT for this to work, the Omega thermosister. Have one?

Pulley size with the 112 seems to be a 2.6 and that is as low as anyone goes. What PSI are you at now?

The factors I came up with when researching a LOT about pulleys were these.

.2 drop in pulley size nets roughly 1.5 lbs. boost. This isn't a hard rule though and I'm sure some would disagree. Look for some great information HERE on guessing your boost/power levels.

And for every 1lb boost you should gain roughly 20HP. Again this is a really rough guess because the timing you put into the motor has a large part in it all.

Hope that helps and I hope you got rid of that CEL!


Onefast you beat me! Good info about the 8" crank pulley but it is a large expense and requires a lot more work too. Personally if you have the blower off you are better off going 1:1 rears. Then you can run a 3.1" front pulley with stock crank and not worry about slip. A PITA though if you don't have the blower off.

 

Meth basically cools the incoming charge air and raises the octane, both of which allow you to run additional timing advance. the tune should not be too hard, just add some advance into you "High Octane" timing tables. You still have the "Low Octane" tables also if you encounter a lot of detonation, but i would not count on this table as your fail safe.


It depends on what type of pulley you already have, I bought a 2.6" but was unable to use it b/c I have the newer style "modular" style pulley and they cannot be interchanged with the older ones that are available, so the 2.8" that came with it is the smallest that you can go. I tried to post pics but they wouldn't attach. I can email you if you like.

It may actually be easier to go with an OD crank pulley instead of a smaller S/C pulley so you don't have to worry about belt slip.

 

Dmm you can in fact by the "modular" Tvs style pulley as a 2.6

 

what comes on the stock supercharger.... 2.8?

woops, just saw that

so the 2.6 slips?

 

Huh...well damn. I was told that the 2.8" was the smallest offered when I called.

And yes, 2.8" is what comes on the 112.

 

The stock is 2.8 and no that 2.6 won't necessarily slip but it is possible. Twitch runs one and says he doesn't have slip but its dependent on the belt you run also.

 

how much boost will a 2.6 give you?

 

1.5 lbs. more than stock!

 

Dmm you have to have one custom manufactured because Magnuson does not offer them. There is an ebay store that sells all the Tvs style pulleys. I asked them to make me 2.6 and they did. If you want me to look up the company specifics let me know.

 

so im guessing the stock 2.8 gives 7LBS so the 2.6 will give you about 8.5

I know the thing is maxxed out and it's super small, but I wana use the meth to counteract all the heat that is going to be produced

 

I am planning on going the same route. I have the meth kit and 2.6 pulley. I just need to install the meth kit and save some cash for a tune.

 

can I get the info on where you got the 2.6?

 

South Florida pulley headquarters.
Terry reals is the owner. Email: wyd_trkr@bellsouth.net

 

if I ask him for a 2.6 for the MP112 he'll now what to give me?

Or do I have to explain it a little?

 

http://item.mobileweb.ebay.com/viewi...id=71117603072

Same seller as this listing. Explain you have a mp112 for a ctsv and it uses a Tvs style hub and you would like a 2.6 in one.

 

when i did the 2.6 on my car it wasnt hard to get to fit. i just filed a minor amount off the bracket directly behind the pulley and never had a problem with it. it wasnt much what so ever and only took about 10 mins using a hand file.

i saw a 1.7 psi gain with a cam and long tubes. ran a total of 9.6 psi and gained 42hp/33tq ish. that might be off a number or two bc i dont have the sheet anymore and dont remember exact numbers. to put down a total of 530/510.

damn i kinda miss my blower. cant beat that whine.

 

^ arent you going for bigger and better things?

What were the specs on ur cam again?