I'm planning an install this weekend of the Greddy lower IC pipe. The I noticed the Helix brand had a nipple on the upper portion of the lower pipe. Now I'm concerned and I don't remember what that hose is for. Do I need the nipple? Can the hose be plumbed elsewhere?

Thanks for the help,
Sam

 

The little nipple is for the pressure line to the boost solenoid and wastegate. In order to get a good pressure signal to the wastegate, it should be there or as close to the turbo as possible.

 

Great, sounds kinda necessary. I'm screwed unless I can find someone to weld one in for me.

Thanks,
Sam

 

wastegate? are you sure? what i know is that is just a vacuum source for the stock boost control solenoid. I use it for my manual boost controller to get vacuum source, but from what i have read lots of times, many people had just plugged close that nipple and used the vacuum source from the line to the bov..
opinions anybody??

 

Yep, I'm sure. Plus EvoSam isn't using a MBC. If he was using a MBC, then he could tap into the BOV line if he had no choice. Most turbo shops recommend using the closest pressure source to the turbo. Which is why you will see bigger turbos w/ fittings tapped in the compressor covers.

Its JDM at least

 

but why GReddy made it like that? just curious
JDM evos different?

 

As a favor. It's better to have individual vacuum sources rather than having every pressure source on the manifold T'd several times.

 

You guys are losing me here. I've never really understood all the vacuum lines in a turbo car all that great, where should I tap for this source? Or, do I absolutely need to have a nipple put into this pipe? It would be easiest if I could get the nipple put in before the install, but I have a feeling that I'll need to pull the stocker out to verify size and location. Worst case, pull the one out of the stocker and put it in the Greddy if possible. I dunno though, pretty thin walls on this thing.

Sam

 

What is JDM?

 

For proper XEDE boost control it has to be somewhere close to the flange. It doesn't have to be in the exact same location as stock. Also, the stock pipe does not have a removable fitting.

 

Everything is removable with the proper motivation and tools. If I can't find the nipple I need at a store the stock one will be cut out. What is JDM?

 

Japanese Domestic Market. Like Evo 7 tail lights and other Japanese parts that are not available through the US distributors.

If you wait until i get home, I can measure the nipple size you will need.

 

you could drill and tap a hole on the compressor housing (right at the discharge) and use a threaded hose barb fitting.

Many turbos come with a hosebarb threaded right into the compressor housing.

I was surprised to see this Mitsu does not.

 

I appreciate that, I got a number of a guy here locally who is a mobile welder who can TIG weld. I'll give him a call and see if he can weld me up a nipple on Saturday. I can't do it now since I have no idea what the orientation needs to be! Worst case I do it to the turbo, I'm just loathe to risk metal shavings in the intake tract.

Thanks,
Sam

 

Okay, question of the hour. While you're measuring that nipple for me can you tell me whether or not it's aluminum? We can weld aluminum to aluminum, but otherwise I have to go a different route. I'll have to either tap the turbo or have an aluminum block welded to the side of the pipe to give it enough wall thickness to drill and tap a fitting there. How come these projects are NEVER easy?

Sam