jproy

Does anyone know what size the Gatorback belt supplied with the Comptech supercharger for the CLS 6-speed is? I think it is 4040252. Can someone verify this please. There is a thread floating around here that says it is a 4040245 and I am pretty sure it is wrong and should be deleted.

Allout

Mine was a 4040252.

mrsteve

iTrader: (1)

There's two different sizes of belts that will work. The larger of the two is sometimes required for the high boost pulley.

The 4040245 is a 24.5" belt. The 4040252 is a 25.2" belt.

Both belts will work with either pulley it just is a pain in the ass at times to squeeze on the 24.5" belt over the larger high boost pulley.

JBlueCLS6

iTrader: (2)

Also do not run the Underdrive pulley. I noticed it in your sig just in case you didn't know.

jproy

Ah, Thanks for the input guys. I have already removed the UR underdrive pulley and replaced it with the stock unit. I have the regular and the high boost pulley and noticed that the used belt I have is the 25.2" belt. Well now we have a good supercharger belt thread that talks about both belt sizes for the HBP and regular boost pulley. I will be using the regular pulley as I do not want a single problem down the road. I have a plethora of supercharger parts. I really got hooked up. I now have a new 24.5" belt I will be using with the regular 4.5 psi pulley. I got it from Summit Racing for $17.

http://store.summitracing.com/egnsea...+115&x=29&y=11

It says its $7.## but they hit you with a $10 service fee or some crap. My belt came for m them with a catalog, a Summit Racing hat, a bunch of NHRA stickers, and an assortment of other promotional nonsense.

JBlueCLS6

iTrader: (2)

You won't have a problem running the HBP. Just disconnect your IMRC

jproy

So you are saying I can run the HBP without any fuel managment or tweak to the FPR. I was told by Comptech that I would have to adjust the FPR to use it. I have no access to a dyno nor would I trust my baby to anyone around here. What should I do? Like I said before, I want tho have this car for a while. Its in perfect condition. How much more power would it make?

mrsteve

iTrader: (1)

You'll pick up around 25-35whp with it.

Just adjust the fuel pressure slightly on the FPR. Should be easy to do with your gauge.

R J Poseidon 6

Why is this anyway?

JBlueCLS6

iTrader: (2)

You'll lose boost.

mrsteve

iTrader: (1)

Smaller pulley on the crank will reduce the amount of rotations on the alternator pulley in relation to engine RPM. Slower alternator speed = slower supercharger speed = less boost.

mrsteve

iTrader: (1)

UR does make a stock size crank pulley that is lightweight. Although I'm not sure you'd experience any noticeable power gains.

I'd much rather keep the stock crank pulley and add a lightweight flywheel.

R J Poseidon 6

Ah .....

Thanx!

jproy

I dont have a Fuel Pressure guage. What do they cost? Where to get and where would I install it? I will admit that I am a bit of a rookie when it comes to the actual install of the supercharger. I will do some searching and see what I come up with. I am sure this has all been covered before.

Allout

I don't have one installed yet but this is what I've got. I bought a 1.5" mechanical gauge that I need to install. I picked up this Marshall Industries one for less than $25 from these guys:
http://cgi.ebay.com/ebaymotors/0-100...spagenameZWDVW

I picked up a No. 6AN male to -6AN female fitting that has a 1/8" NPT port. This should go right inline at the fitting that replaced the stock FPR.





Take a look at page 10 of the install instructions for the SC and you'll see where I mean on fitting "D".
http://www.comptechusa.com/store/med...ons/ins104.pdf

This won't help me monitor the fuel pressure as I'm driving but will help me set the base fuel pressure if I need to adjust the FPR.

jproy

Great. I know the part of the instructions you speak of and that seems simple enough. I guess I need to find a dyno where it can be adjusted. Anyone know of one around here? I would be willing ot go to Houston or Austin if I had to.