DTR's Turbo'd M52 E30 track/street Demonstrator

[BUDNUNTA]

Any benefit to the super big downpipe?
Obviously it makes a better area to dump the wastegate into as in you can make a smoother transition.
Nice looking fuel rail.
Cant wait ot see it done. Non-Vanos m50 FTW






Hunter

[cmflossin]

what wheels are those? are you planning on going 5 lug?

[Erick]

With wheels and brakes like those, it's safe to assume he's staying 4 lug. :p

[DTRguy]

Any benefit to the super big downpipe?
Obviously it makes a better area to dump the wastegate into as in you can make a smoother transition.
Nice looking fuel rail.
Cant wait ot see it done. Non-Vanos m50 FTW






Hunter

Well there are a few advantages... first, when I go to a bigger turbo setup there is less to rebuild. Second and honestly more importantly, the most important part to a turbo exhaust is where it is hottest for flow. That is the downpipe. Just as putting on a 3" dp to an otherwise stock 1.8t VW helps out a lot this will also. It is a Non Vanos M50 head (but an M52 2.8 bottom end)

what wheels are those? are you planning on going 5 lug?

NOPE... No five lug. It isn't really needed. The cost of upgrading outweighs the benefit. I will be studding the four lug. Sure, I might go through front wheel bearings a little more often, but that is cheap by comparison to the swap. Maybe someday when I can have new centers made or whatever... but for cost reasons No def not.

With wheels and brakes like those, it's safe to assume he's staying 4 lug. :p

Yep :)

[DTRguy]

downpipe almost done!

as it was prior to the reducer and v band flange


with the reducer and flange

[e30polak]

Subscribed! That thing is gonna be a monster! :crazy:

[shiboujin]

No mandrel bends? Looks tight in there. Wow. I thought my 3" was a PITA

[DTRguy]

No mandrel bends? Looks tight in there. Wow. I thought my 3" was a PITA

Nope... only a small piece up top... it's what I call using what is available to save a few dollars (make that a lot of dollars). Recycle man :)

There is like 40 welds all internally purged. Plus mandrels are nice, but have a longer radius and I don't have that luxury. In addition sometimes when dealing with such tight tolerances, it is easier for fitment to control every step it makes. It is very tight, but has room where it needs it. I can even install it and remove it without doing anything special ;)

[shiboujin]

lol I like your style.

How is the WG going to get hooked up or is it just an open dump?

[DTRguy]

lol I like your style.

How is the WG going to get hooked up or is it just an open dump?

Look back in the other pics and you can see that the WG is pointing back and slightly up... I am going to be installing a mandrel tube that will join into the DP at a low angle really close to the flex... I also have a flex section for that as well to reduce chances of undue stress.

I don't do open WG... did it on my first turbo build 7 years ago. I quickly changed it and never again. Sounds like POOP. (JMHO)

[shiboujin]

So the WG tube will meet the DP before the flex and you want a flex pipe on the WG tube? I run a 38mm WG and couldn't find a flex pipe 1.5". So I bumped to a 1.75" lol. I'm actually doing the exact fabrication youre doing now but I'm just redoing mine. slightly easier.

[DTRguy]

So the WG tube will meet the DP before the flex and you want a flex pipe on the WG tube? I run a 38mm WG and couldn't find a flex pipe 1.5". So I bumped to a 1.75" lol. I'm actually doing the exact fabrication youre doing now but I'm just redoing mine. slightly easier.

I have a Tial 44... comes out 1.75 will up size to 2" for the tiny flex that I have. Then down the gullet it will go. Should dump in about 18-24" down from turbo. It is about 26" to the top of the flex centerline. I also still have to install the O2 bung and breather pipe... One of the reasons the lower elbow is so acute (to give me more room for the breather pipe). It should also increase the velocity around where it is going to insert to make the breather work well.

I am hoping to never really have to re do any of this. If in the future I go much bigger the DP won't have to be redone.

Oh forgot to mention, if you don't put in either a slip joint or a flex it will most likely break something on the header (ask me how I know) ;)

[shiboujin]

I hope you don't wind up redoing it but even my minor repositioning of the turbo has made me redo so much >_<. I'm interested to see the breather setup. Do you have to pass emissions? Isn't it bad for emissions to have it shoot down pre cat? You going to use a check valve? Yes I'm cluttering up your thread :)

[DTRguy]

I hope you don't wind up redoing it but even my minor repositioning of the turbo has made me redo so much >_<. I'm interested to see the breather setup. Do you have to pass emissions? Isn't it bad for emissions to have it shoot down pre cat? You going to use a check valve? Yes I'm cluttering up your thread :)

Not clutter... No worries.... Emissions hmmm wha's that (I is in KY) :) Anyway, with such an old car, the standards are so lax that I can get one to pass easily without a cat. The heat of the exhaust basically will incinerate any oil/gas/water vapors that enter instantly. No cat, and yeah a check valve always do... I have been doing exhaust evac breathers with a catch can for 5 years now. Work great!

[shiboujin]

Hmm.. maybe ill do one. But I have a cat tho. Youre saying its ok to do it pre cat? What if I have shit loads of blow by? lol.