jicl55

Have the Mercedes 82mm throttle body and 80mm y pipes. How did you guys get it to fit? It doesn't fit exactly no matter what I tried: rightside up, upside down, no rubber gasket (but I think you need it to stop air leak), etc. Do you just force the thing on there? Any help would be appreciated.

Road Racer

Im also looking for the "Y" pipe for a 82mm ttb.
Where could I find it?

ahmad0658

Customize one from any other good material for under hood condition .. easy as that. This is what I got with my 82mm from Bruce (TTmotorsports).

sneakyneon

You can use a stock one, you need a 3.5 stright hose to connect the two parts but there both about the same outside dia, I would recomend porting the inside of the Y to help with flow.

cutt

i believe u can invert the rubber gasket in the t/b y pipe and the it should fit.

jicl55

There are 3 parts to the y pipe. The whole PVC thing, the rubber gasket and a small plastic ring that snaps onto the PVC y pipes and helps hold the rubber gasket it. There is no way I can fit the throttle body with that small plastic ring. It just doesn't fit unless modifications are in order (either trimming the throttle body down from the OUTSIDE) or trimming that plastic snap on ring piece down on the inside (which I tried a bit, but still doesn't slide on and with the rubber gasket the right way it fits even less).

The only way I can get it to kinda fit is: No plastic ring piece, gasket inverted, then it slides onto the y pipes. But it is fairly loose. It doesn't really stay in there firmly, the clasps on the y pipes don't clasp and it seems like the rubber gasket could be moved around fairly easily and upset the whole applecart (like a strong pothole or something) and move on the throttle body and allow air in. Or air could still come in where the larger rubber gasket meets up with the y pipes.

I haven't tried it on the car yet, and it may be different once installing and the whole y pipes and tubes are held down, but I'm still not comfortable with it. I can tell it very well may be a problem.

I need a way to clamp that inverted rubber gasket in place so it doesn't move and something to allow a tighter fit of the rubber gasket onto the y pipes without the plastic ring part. Or something on the outside to clamp both the rubber gasket and the y pipes......

lowprofile

Shoot me a pm with your address. I will send you a couple of o-rings that fit perfect.

blackbenzz

Trim the inner plastic ring with a dremel til you get a nice tight fit

KLR CLS

I think I need to make something in CF for this. I think a custom y-pipe with larger bore and bigger flow would be a great part.

jicl55

PM sent. Thanks again

I started doing this but I was thinking there is a little lip on the far inside that helps hold the gasket in place. I would probably have to completely remove that lip to get it to fit, thus the gasket still wouldn't be held on quite right, so I stopped before I did something irreversible in case there is another way.

That's a great idea. Please do! I think just some big, straight tubes with a couple of cones would be best, but heat soak, heat soak, heat soak.... and not all of us want to loose a bright light to compensate A heat shield that could match up with the front somewhere and help seal in the cone filter would be great, but not a lot of space. Of course, I always thought that a custom hood with some huge openings near the throttle body and mated to some pipes would do the trick nicely, but fairly involved and rain just might be your worst nightmare.

stevebez

Anyone modify their VRUS "80mm" CF air boxes for the 82 mm TB?

I suppose a gasket attached with sealant to the larger airbox bore should do the trick?

Question is how to get a nice clean circle on the CF air box... guess sanding drum and a good template probably easiest.

The other issue is getting the TB to fit properly onto the s/c adaptor housing and providing enough space for the CF AB to fit on ok. Using an adaptor plate will take up too much space ... need TB to fit flush with S/C housing.

I think for this diff in diam I am not sure its worth this amount of work... and problems.

blackbenzz

The "80"mm TB is actually 78mm and stock is 74mm. When you go to 82mm from a "80mm" you are making another 4mm jump like when you went from stock to "80".

lowprofile

Received your PM, I'll send them out today.

"The other issue is getting the TB to fit properly onto the s/c adaptor housing and providing enough space for the CF AB to fit on ok. Using an adaptor plate will take up too much space ... need TB to fit flush with S/C housing".

Who says you need to use an adapter plate?

Exotic-metal55

I was using the inverted rubber gasket trick had no issues with that but took Amhad`s advice and did the "trim the inner ring" trick and it is a nice clean stock seal now.. Very easy and only had to remove a very small amount of the ring.. This is for my stock air boxes.

I also have a CF airbox and use the inverted rubber gasket for it.. I also ported the neck of the air box to fit over my 82mm TB and used a die grinder with 2" round sanding tool.. It is not a flat sanding bit but a cylinder sanding bit.. Took about 2mm out of the OD, as I recall but not all the 82mm TB have the same outside diameter.. Mine is a mercedes 82mm and has same 82mm Id but smaller OD lip.. Some of the Bosch are pretty thick on the OD..

stevebez

!!! please tell me what S/C interface housing u are using .. or have you modified "80mm" version?

stevebez

What model no is your merc TB? And what solution have you used for the sc / tb interface?

lowprofile

I'll pm you Steve.

stevebez

Many thx...

jicl55

They do fit perfectly Many, many thanks.

Luke_M

Is the inlet for these a stock 74mm inlet bored to 82mm? Or is it off another car? Seems to me you could use an 82mm throttle body and a custom Y-Pipe made from silcone or perhaps steel/aluminum piping. Any decent fabricator should be able to do that no?

Just thinking out loud. I'm not sure I want to buy an 82mm kit if I can make it "better" fairly easily and cheaper.

lowprofile

Here's the part # for anyone interested; Part Number: 90025K396
Purchased from McMaster.com

10 o-rings come in the package, you need only two for each application. Remove the plastic retainer and rubber seal from the y-pipe, replace with two new quad style o-rings, and assemble.

Note: This is for the MB 82mm throttle being used in conjunction with the 80mm y-pipe.

Road Racer

What if I have the OE Y-pipe, (74mm) and I have an 82mm ttb?

lowprofile

Honestly I haven't mic'd the 74mm Y-pipe, but I imagine it is smaller then the 80mm version. I would be hesitant to use anything smaller than the 80mm as there is a slight step going from the y-pipe to the throttle body when using the 80mm version.
That said, If you want to mic it and post the measurements, we might be able to find a solution for you.

stevebez

So what are the gains of the 82mm over the 80mm ... ?

lowprofile

Gains would depend on your specific mods, engine health, tune, etc. For comparison, Alan reported about 25hp on a heat soaked motor, iirc.

Also, keep in mind you are actually upgrading from a 78mm(80mm true measurement) when you go this route.