Custom Downpipe questions

[PPI Typhoon]

I got that T76 yesterday (thank you again Nolan) and I'm looking into making the DP. My engineer here at work was asking me about the flapper valve inside things like the stock and PTE downpipes. Can you buy these seperately?

Also, I'm headed to Capitol Metals today. Should I go with stainless for the flange or just stright galv. steel? He thinks stainless. He's getting me in with his laser cutter, so we're going to machine the first one, then take it to our laser cutter.

Lastly......we were talking about how to figure out the bends when I thought about using that vent tube for HVAC. They have those couplers that you can rotate into all kinds of shapes and bends. Has anyone used those to get an idea on the shape of the DP? I'm thinking of trying it to see what I can come up with.

My main concern though is that flapper and if that's available.

Thanks in advance.

 

[JSM]

PTE sells I think the first 6", including flange and start of pipe. That is route I would go -vs- inventing the wheel again.

In terms of bends, buy some mandrel u-bends. www.stainlessworks.net is just one place.

From there I weld on a bend piece, see where to cut next end, repeat.

 

[PPI Typhoon]

PTE sells I think the first 6", including flange and start of pipe. That is route I would go -vs- inventing the wheel again.

In terms of bends, buy some mandrel u-bends. www.stainlessworks.net is just one place.

From there I weld on a bend piece, see where to cut next end, repeat.

I wasn't aware that they sold just that section. Any ideas on price?? I understand the "reinventing" part, but all my machine work/time is free, and the laser cut is only running me $60 and as many as I can cut in an hour.

The tubing also, we already have a pile of it here (stainless), so he said I have free reign to dig through that and take what I need. It's all mandrel bent with more than enough to do even a few DP's woth.

He was just curious about the flapper.

Plus, it kinda goes with my DIY approach with the truck. :rock:

 

[93ty475]

Re: Custom Downpipe questions

I got that T76 yesterday (thank you again Nolan) and I'm looking into making the DP. My engineer here at work was asking me about the flapper valve inside things like the stock and PTE downpipes. Can you buy these seperately?

Also, I'm headed to Capitol Metals today. Should I go with stainless for the flange or just stright galv. steel? He thinks stainless. He's getting me in with his laser cutter, so we're going to machine the first one, then take it to our laser cutter.

Lastly......we were talking about how to figure out the bends when I thought about using that vent tube for HVAC. They have those couplers that you can rotate into all kinds of shapes and bends. Has anyone used those to get an idea on the shape of the DP? I'm thinking of trying it to see what I can come up with.

My main concern though is that flapper and if that's available.

Thanks in advance.

are you going with a 3" ? buy the exhaust elbow like js says...remember to cut the U-bends radially so it will look right when you weld them together...i'm glad i tacked mine before final welding it...had to take it apart at a section or two to make final adjustments....piece of cake for the most part...might help to pull the passenger side fender for this...i don't know about the shaper, but i used various photos of downpipes that i found by searching, to get me started...

http://www.syty.net/phpBB2/viewtopic.php?t=36035&highlight=downpipe+made

 

[PPI Typhoon]

Thanks, I was looking for that post. :tup:

How much did you get the first section for from PTE?? I looked on their site and can't find it.

 

[93ty475]

mine came with the stealth turbo i bought from marlboromarty...shouldn't be that big of a deal for one of our suppliers to get you one...also check with mike lee..good luck...

 

[PPI Typhoon]

Well, we started doing the work in Solidworks to see about making a flapper setup. But we then got to talking, and I decided I'm going with an external WG. However, my desire to NOT have it on my crossover is causing me to put it on the downpipe itself, using the stock diverting port on the PTE housing.

Things are pretty close here, but we're going to mill it out of aluminum first to check fittings before the steel is milled and then taken to the laser cutter.

Here is the flange we came up with. You can see that we're going to inset a 3" OD pipe and a 1.5" OD pipe halfway into the flange for better support. Now I just need to get a wastegate to get figure out the flanges and routing for that exhaust portion. Not sure about how the orientation will fit, so the WG portion will probably be close to the last thing done for fitting.

 

[Tommyquest]

Dan I beleive Nolan was able to buy just the flange and flapper from PTE. You'll have to ask him to know for sure. If you look at the pics on his website his DP is custom right off the flange.

 

[PPI Typhoon]

Dan I beleive Nolan was able to buy just the flange and flapper from PTE. You'll have to ask him to know for sure. If you look at the pics on his website his DP is custom right off the flange.

Yeah I realized that now. Thanks. I still think I want to go this route though. I think the external will give me a little better handle on boost control anyways.

 

[10secTy]

I got mine custom made from Terry Houston. It is set up for 3.5" downpipe and had a larger flapper. Mike Lee make a downpipe kit like you are talking about go check out his site.

Nolan

 

[ed hess]

dont know if this would help. but i have this adapter that keith made i dont need anymore since i have new headers.

one end bolts to atr headers, other end mounts gt42 turbo housing. (dimension for this end are in garret catalog). racegate mounts off the adapter and comes up right between turbo and ac bracket.

adapter also has a port for backpressure testing and another for egt port.

 

[Tommyquest]

dont know if this would help. but i have this adapter that keith made i dont need anymore since i have new headers.

one end bolts to atr headers, other end mounts gt42 turbo housing. (dimension for this end are in garret catalog). racegate mounts off the adapter and comes up right between turbo and ac bracket.

adapter also has a port for backpressure testing and another for egt port.

ITS makes this adapter

 

[PPI Typhoon]

dont know if this would help. but i have this adapter that keith made i dont need anymore since i have new headers.

one end bolts to atr headers, other end mounts gt42 turbo housing. (dimension for this end are in garret catalog). racegate mounts off the adapter and comes up right between turbo and ac bracket.

adapter also has a port for backpressure testing and another for egt port.

Have any pics?? How much??

 

[ed hess]

dan

these show the placement pretty well.

 

[bezerk]

are you going to run the 76 turbo on a block with stock internals?

 

[PPI Typhoon]

dan

these show the placement pretty well.

Thanks Ed.....only problem with that is it looks like that might interfere with the A/C. My plan is to keep it. By the looks of that, it wouldn't be an option with that setup. Nolan had included the spacer that I need to use. Have you explored the option of turning that 180 degrees??

On a side note, what would you want for that?? If you want, shoot me a PM and we can talk. :tup:

 

[PPI Typhoon]

are you going to run the 76 turbo on a block with stock internals?

:rotf: No, I have a block, heads, crank, etc waiting on a rebuild, but there's nothing wrong with getting it out of the way. :wink:

My plan is a 4 bolt block, forged internals, 412 cam, stock exhaust manifolds, vortec heads, of course, the T76 and A2A.

I'm still in the "dreaming" stage, but it's getting closer. :tup: