Turbo dilemma....

joefarmer said:
Doesn't work. Hits the thermostat/alternator/oil filter housing.
Click to expand...

How much interference with the t-stat and alternator.... is it a solvable problem? My oil filter is remote mounted so I have no issue there.

Thanks.
 
TheSh111t said:
I ran into a problem a lot like yours when I did the compound turbo setup on in my 81 Chevy Cummins conversion. It seemed like there were limited places to put the primary turbo that still allowed for proper exhaust routing. I ended up having to pull the primary turbo forward almost directly next to the secondary. This gave me enough room to get the 5" downpipe under the truck. I am using a 62mm s300, a 75mm s400 and a PDI manifold flipped upside down. If you look at the pics you can see that my pipe connecting the hot side of the 2 turbos is quite a bit differant then the 90* elbow you have. You may have to build your own piping. Here are a couple pictures of my homebuilt setup. If you have any questions or need more photos feel free to ask. I hope this helps a little.


IMG_0013.jpg
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Now I'm thinking outside the box!

:rockwoot:
 
carcrafter22 said:
Hdrokn, if you look at my buildup thread of my 67F100 you will see how I had to mount my twins. I did a similar setup to haloman since I could never mount a high and low turbo setup like most of the dodge guys do. The standard manifold mount/ fender mount (like haloman posted pics of) work well for the F100 trucks and looks kinda cool too.
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Hey CC,

Nice thread.... felt like I was reading something of my own fabrication! :hehe:

Love the truck!

:Cheer:
 
HRDROKN said:
How much interference with the t-stat and alternator.... is it a solvable problem? My oil filter is remote mounted so I have no issue there.

Thanks.
Click to expand...

Actually it looks like Old Smokey already worked around that issue.
CIMG0723.jpg
 
Rollin Coal said:
dont the stock CR manifold eat up alot of power compared to a 24v one?
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So the question is will an aftermarket manifold (2-piece) run upside down? This should help the power issue if doable.

Also do I need to run a wastegate with a SB over a S475 ?

:Cheer:
 
HRDROKN said:
So the question is will an aftermarket manifold (2-piece) run upside down? This should help the power issue if doable.

Also do I need to run a wastegate with a SB over a S475 ?

:Cheer:
Click to expand...

On that wastegate.... maybe I don't need one if I run that 62/74 on top? I would think that I need every bit of available energy to spin that? Or am I missing something here?

:what:
 
HRDROKN said:
On that wastegate.... maybe I don't need one if I run that 62/74 on top? I would think that I need every bit of available energy to spin that? Or am I missing something here?

:what:
Click to expand...

id run an external gate. unless you go with a bigger exhaust housing, but then you'd sacrifice spool up
 
HRDROKN said:
Now I'm thinking outside the box!

:rockwoot:
Click to expand...

Thats just it... These types of projects are ALL outside the box. Sometimes you have to do whatever it takes to squeeze these beasts into whatever contraption you decide "Needs" Cummins power.:rockwoot:
 
The oil filter is where I ran into a problem and getting the intake hooked up to the 3B. But it looks like you have that problem solved
 
oldsmokey said:
The oil filter is where I ran into a problem and getting the intake hooked up to the 3B. But it looks like you have that problem solved
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Yes, the oil filter and housing was a problem, but I managed to get the turbo over far enough to the passanger side to for the turbo inlet to clear the oil filter assy and then ran a 45* rubber elbow to a short piece of 5" diameter exhaust pipe and then attached the air filter to that. It's tight, but it all fits and I can get the oil filter off without removing any of it. I may not have the best looking set of twins I have ever seen, but it works for me.
 
Rollin Coal said:
id run an external gate. unless you go with a bigger exhaust housing, but then you'd sacrifice spool up
Click to expand...

Ok... so it worthwhile to run a gate with a 62/74/14 on top...

What about a blow off valve or would that not be needed or useful?

:Cheer:
 
if your going to use an out of the box II 62 or something the internal gates are more than enough.

blow off valve will never hurt anything.
 
If 650 is your goal, have you considered the smaller S400's. The 75/83/1.1 is a bit smaller package and doesn't need an external gate below 650hp. It's a one hand turbo instead of a 2 hand. With a tighter bend on the hot pipe you can put it almost directly under the secondary.
 
RonA said:
If 650 is your goal, have you considered the smaller S400's. The 75/83/1.1 is a bit smaller package and doesn't need an external gate below 650hp. It's a one hand turbo instead of a 2 hand. With a tighter bend on the hot pipe you can put it almost directly under the secondary.
Click to expand...

Well that is an idea.... I think that once I reach that 600-650 mark as I get the rest of the truck sorted out... I just might be looking for more. IDK... never know when that HP bug bites. Might be better towing with the smaller primary? Hmmmmmm....

:bow:
 
I made over 700hp with a 64/71/.8 over 75/83/1.1. No external gates. That was one of the best setups I've tried to date as far as being fun to drive. Towed like a dream. Just thought I'd throw that out there. Bu having a dounle bemd in the hotpipe you can move the primary forward to gain firewall clearance. I'm not clear on where your having the problem.
 
How about something like this?

IMG_3071.jpg

IMG_3070.jpg

IMG_3078.jpg

IMG_3075.jpg

IMG_3071-1.jpg

IMG_3076.jpg

IMG_3284.jpg


The S400 has bracket that runs down to the custom coolant outlet/ a/c mount to support it from underneath, that is not pictured.
 
RonA said:
I made over 700hp with a 64/71/.8 over 75/83/1.1. No external gates. That was one of the best setups I've tried to date as far as being fun to drive. Towed like a dream. Just thought I'd throw that out there. Bu having a dounle bemd in the hotpipe you can move the primary forward to gain firewall clearance. I'm not clear on where your having the problem.
Click to expand...

Hey.... how were the EGT's with this set up? and how do you think it would work with my secondary charger?

Assuming it will be fine.....

Anyone have a 75/83/1.1 laying around that I can borrow to check fit? :hehe:
 
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