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Twins turbos just arrived............Yay!

DEMON44

DEMON44

Low-Tech Redneck
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...........for the Cummins :D Used kit but got a great deal on it. HX40 & HT4C. turbos in good shape.

I'm painting intake pipes red before install. Yes the HT4C is FRIGGing huge................yes thats a 50mm external wastegate............yes thats a 5" down tube for the exhaust..........



Giggidy giggidy.............. psi here we come :D

Twins001.jpg

Twins003.jpg

Twins002.jpg

Twins004.jpg

Twins005.jpg

Twins006.jpg
 
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Looks good, can you explain the reason why one turbo is larger? I figured the same size for both would better, i'm turbotarded. hah
 
Pvt. Maggot said:
Looks good, can you explain the reason why one turbo is larger? I figured the same size for both would better, i'm turbotarded. hah
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one turbo is for low Rpm boost(small turbo) and one is for higher rpm big boost (big turbo). Two of the same size won't do a lot.

What kit is that? Not many have a nice external wastegate, Poole's kit is the only one I've really seen.
 
Ya what he said..............compound turbos. Small one force feeds the big one, to keep lag down to a minimum. and to maintain max boost more easily.


It's a J.R. Adkins kit. not a huge mainstream company, just a guy than makes some nice stuff. its an ATS manifold though. and the HX40 is off a 6C (8.3L) cummins and from what I understand the HT4C is off an N14 (14L) Cummins

I've got to tune it down to about 45psi with the 150 horse nozzels until I can get the head studs installed. then I'll up it to about 50psi. then once I get the head o-ringed she sit at about 60psi.
 
DEMON44 said:
Ya what he said..............compound turbos. Small one force feeds the big one, to keep lag down to a minimum. and to maintain max boost more easily.


It's a J.R. Adkins kit. not a huge mainstream company, just a guy than makes some nice stuff. its an ATS manifold though. and the HX40 is off a 6C (8.3L) cummins and from what I understand the HT4C is off an N14 (14L) Cummins

I've got to tune it down to about 45psi with the 150 horse nozzels until I can get the head studs installed. then I'll up it to about 50psi. then once I get the head o-ringed she sit at about 60psi.
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by buddy had the Piers kit on his 05. HX40 feeding into a HT3B. He was pushing 60PSI though. He worked at a big truck shop, and compared the HT3B to one of thet rucks in the shop with an N14 in it, it was the exact same turbo, haha. That thing MOVED for as big of a truck as it was.
 
ya I can boil the rears on dry pavement as it its right now in second.........


I believe the HT3B and HT4C are virtually identical 'cept for different compressor wheels. but not exactly sure though.


The previous owner of this set dyno'd 606 RWHP in his '01 with just injectors this kit intake/ exhaust, and a fuel box. And once just set it up to 80 psi just for fun......to see what would happen:bow:
 
the spool time was AMAZING too. We only ever got a video of it on a cellphone but it seemed to take a split second to go from like 15psi to 60psi. There is nothing like watching a boost gauge jump like that and realizing those numbers don't add up to 20 like a car, haha.
 
Doesnt the big turbo blow into the smaller turbo? The air is already compressed when it enters the smaller turbo, so the second turbo can be smaller.

Taken from another website:

In the very nature of compounding the first stage must be larger than the second on the order nearly equal to the pressure ratio it delivers to the second stage. (In the example I gave it would need to be around twice as "big" or more depending on other conditions.)
 
yes the big turbo blows into the small turbo. But the smaller turbo is about low end boost. It is the first stop for the exhaust stream. It builds boost like it would were the big turbo there or not. As the RPMs build and the exhaust temp goes up as well, the bigger turbo catches up and builds boost. At that point, the littler turbo is partially a restriction(maybe just in my mind). Twins is about having a ton of boost while still having good low end boost characteristics, thus reducing the lag you would get if you had just a large turbo.

DodgeTwins4.JPG
 
there you go........ exactly.

exhaust and boost are opposite of each other........as in

exhaust = exhaust manifold --> small turbo -->big turbo --> out

boost = airfilter --> big turbo --> small turbo --> intercooler......engine.


you can just about trace the pipes from my picture with that picture.....except for the external wastegate dump into the hot pipe.......


AND PAUL............I hope to have this rigged in the next couple weeks, never mind by Stampede time :D
 
coloradok5 said:
Red :D
Click to expand...

:doah: busted by the boss, thanks :p:


i love the orange in it, i have a 69 c-10 that is close to that color. that is why i ask. if the name comes to u, please pm me. thanks
 
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