3 Inch GM MAS with 2.5 Inch Piping - Which Couplers

[kilurv8]

I have read more threads about the GM MAFT than I care to admit and I still can not find a clear answer. I am switching to the 3 inch GM MAFT and I want to run it blow through style on my 2.5 inch intercooler piping after the BOV. Now the problem is that the outside casing to the 3 inch MAF is actually about 3.25 inches and I can not find a 3.25 to 2.5 inch coupler. I need to be sure the couplers will stay in place for up to 33psi of boost. Anyone have any idea what they did to get this to occur without blowing couplers? Any input would be appreciated.

 

[98TsiAWD]

Have you checked out menards/home depot at all for PVC couplings? They should have ones that will work.

 

[kilurv8]

Will these withstand 33 psi of pressure? Most PVC pipes that use these couplers in homes are not under pressure of any kind. I would hate to use them and have them blow out at the track.

 

[98TsiAWD]

Originally posted by kilurv8
Will these withstand 33 psi of pressure? Most PVC pipes that use these couplers in homes are not under pressure of any kind. I would hate to use them and have them blow out at the track.

Im not sure, I know some people run them, but most dont run 33psi like you

 

[Green93TalonTSi]

try www.DSMotorsports.com & www.turbohoses.com

 

[DSMTurbos]

the ones from home depot won't hold. under that much boost since they aren't reinforcerent they will stretch and then compact and eventually tear or blow off

 

[Cirus_93TSI]

someone on another post said he had to heat the coupler up and lube up the maf with dish soap to get it on, then it blew off and he had to put screws through the coupler into the maf itself
what u could do it put a bead on ur uicp, if u dont have access to a pipe beader u can make a bead of weld or probally even use jb weld, then put a hose clamp real tight behind the bead and it shouldnt blow off, the one on the throtle body side is the only one u will have to worry about, the one on the bov side should hole fine

 

[Airpoppoff]

I got the new turbonetics silicon couplings for my intercooler, they work awesome and it says on the side that they withstand 50psi. Im not sure if they have them in the right size though...

 

[Blk_99gst]

I don't believe the heat up/use dishsoap to get the couplers on story. I got 3" to 2.25" 3-ply turbo couplers from RRE, and there was no way those couplers were getting on without some hacking. I had to hack 1-ply of the 3" section for about 1 1/2 inches to fit over the gm maf. I'm pretty confident that they will hold up under boost (I'll be running 20psi), but I'm a little worried about boost leaks; we'll see.

 

[RuBiCaNT5X]

I would just buy a 3.5 to 2.5 coupler and clamp it down extra tight. If you are uncomfortable doing that, gap some of the clearance with duct tape. tear it about the width of the lip on the MAF and wrap it around a few times. Get an extra heavy duty band clamp and you are good to go to crank that f'er down.

 

[Sotarts]

Originally posted by kilurv8
I have read more threads about the GM MAFT than I care to admit and I still can not find a clear answer. I am switching to the 3 inch GM MAFT and I want to run it blow through style on my 2.5 inch intercooler piping after the BOV. Now the problem is that the outside casing to the 3 inch MAF is actually about 3.25 inches and I can not find a 3.25 to 2.5 inch coupler. I need to be sure the couplers will stay in place for up to 33psi of boost. Anyone have any idea what they did to get this to occur without blowing couplers? Any input would be appreciated.

http://turbotrix.com/parts/misc.shtml

Scroll all the way down.

 

[Coldandafraid]

I was going to try going to my local muffler shop and getting them to take some 2.5 inch pipe and putting it on their pipe expander. I dont know how big it can get, but hopefully we can get it close enough, then, I just have to use a couple of couplers on each side... or get them to weld the expanded pieces onto my cut up UICP. Might not look great, but should work.

 

[Sotarts]

Originally posted by Coldandafraid
I was going to try going to my local muffler shop and getting them to take some 2.5 inch pipe and putting it on their pipe expander. I dont know how big it can get, but hopefully we can get it close enough, then, I just have to use a couple of couplers on each side... or get them to weld the expanded pieces onto my cut up UICP. Might not look great, but should work.

Um, you're not making solid/non-moving connections, are you?

 

[Coldandafraid]

what do you mean? The UICP is already a solid piece... is that a bad thing?

Anyways, what I had in mind was cutting out a chunk of the pipe. and welding the 2 smaller expanding pieces on to the ends. And then using silicone couplers to put the GM MAF in the middle... so, it will still have that flex, same as if you had used the expanding couplers as seen in that picture above, just hopefully more able to withstand the pressure.

 

[Coldandafraid]

like this

 

[Sotarts]

Ok, this POS won't load attachements.

Image: http://dejontool.com/images/DSM-1g FIC/UIP-1gC2.JPG

That's what you want if I'm understanding.

http://dejontool.com/DSM-1g FIC.htm

http://dejontool.com/Fuel.htm

They should be able to sell you only what you need.

 

[Sotarts]

Yeah.

http://dejontool.com/DSM-1g FIC.htm

 

[Coldandafraid]

ahhh... yes, that would be exactly what i had in mind. But then i have to spend more money on a new pipe.

 

[Tallen]

Umm.... NAPA part #8097 (i think). They fit well witha little coaxing. Cost $20 for the pair. Their nitrile rubber hose....my home depot connectors blew up under 15 psi of boost.