Ok so I am just spit balling here....

With money tight and doing my upgrades in stages to an extent, this is what I am wondering...

Would it be possible to go from the stock turbo into a spyder then into the riff raff plenums? Skipping an intercooler for now...

I realize I would have to fab up some piping to go from the stock turbo to the spider....and I would have to step up in pipe inner diameter to match the two... I am thinking it would basically be a "u" shaped piece...

I don't have the money for the intercooler or a bigger turbo at the moment and with the engine out, doing efuel, up pipes, now would also be the time to do the plenums...but they don't work with a stock turbo..

Thoughts?

 

I have made a fewof these with and without intercoolers on 2" or 3" plenums. Its very simple, you need 2 1/4" u bend and a 3" u-bend to make the "y". The 3" will be your base "y" into the 3" boots. A hole will be cut/plasma/torched into the 3" u bend to receive the 2 1/4" pipe flush welded. Cut the neck that mates to the turbo outlet of the stock Y and weld it to the other end of the 2 1/4" pipe. It takes a little creativity with angle to make it look factory, but its fairly straight forward. I do not have any pics of the 2" plenum setup or 3" plenum setups without an IC..

Here is a pic of the first one I ever did with 3" plenums and an IC on a stock turbo. Not perfect, and have made the setup look much better since fabbing on other trucks. It used a shaved 99.5+ x pipe, but a 3" u bend is much cheaper and less time consuming. Didn't have anything sitting around except reducers, now I can roll or have another shop roll a coned sheet for 2 to 3".

 

Thank you that helps!
Will I loose some boost going from small turbo outlet 2.25" to 3" plenums?

 

Lee,what nick is showing is to add an ic.

If you are not adding one then you just want to go from stock turbo to 3" plenums if i understand correctly...

 

Aaron, You are correct on the stock turbo to 3"...however I was hoping to keep and re use the spider when I do upgrade turbos...

 

That might be possible to go turbo to 3" plenums.I doubt much improvement tho.
No way it could be reused on ic setup tho.
I would stick with the stock plenums until you upgrade turbo.

 

Correct me if I'm wrong here, but a stock Y-pipe is 2" to a 2" plenum. You want to go to a 3" plenum, right? The e99 trucks are 3" spider to a 2" plenum. So get a set of e99 boots and use the stock Y-pipe. Or is the e99 spider only 2.5"?

 

Mmmm. I think you have it backwards. The e99 plenums are still 2" I think. Correct me if I am wrong

 

Its gonna b custom.it might b able to be built maybe.that turn down to a y piece from the turbo may be very tight.
I don't think its worth the effort.when he upgrades turbo just do proper plenums then.I'm also thinking that the thick biller plenums and turbo inlet boot may be even tighter than normal..

 

The e99 have the 2" intake plenums same as our obs trucks, the e99 spider has 2.5" to 2" reducer boots.

 

Rather than going turbo outlet to spider This is more of what I was thinking... Pardon the rough ms paint but my drawing skill are lacking...



This is what I was originally wondering about...

 

Yes, but I know that they use a reducer boot at the spider and was thinking that it may be a 3-2" boot, but as verified below, it is only a 2.5-2" reducer.

So if the OP really wants to add the 3" plenums now, couldn't he just use the stock Y-pipe with a this 3-2" reducer? Tube Reducer

 

Thats a handy link...Thank you.

 

Hmm... it never ran through my mind about the 2.5 to 3" boot. it should work