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Hx35 6.7 Cummins turbo

Chris_decker01

Probationary Member
3
0
Sep 14, 2021
Dublin, Virginia
1990 eclipse gsx

Okay I am trying to learn as much as I can I'm 18 and not as experienced as everyone else yet.
I have read many forums on here about the hx35. I recently purchased a hx35 and the seller said it was from a 6.7 Cummins. It's a twin scroll deal.
I found a bullseye power .70 a/r housing to swap onto it to get rid of the twin scroll. I also purchased a t3/t4 manifold, tial 50mm bov, and a 38mm wastegate. Plan on running speed density and do away with maf as well. There is still several parts I need to acquire before my build starts.

I have a few questions as far as what I'm missing. I will be changing to bigger injectors and 450 fuel pump. I'm already on link v3 with my big 16g. What else will I need and what down pipe, o2 will I need. Can someone send me a link to it and inform me better on what else I need.

As said above I have read the forums I just can't make sense of some of the parts mentioned and where to find them.
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jpmxrider489

Supporting VIP
2,267
72
Apr 4, 2010
pittsburgh, Pennsylvania
Most downpipes for the vband housings are custom and normally not cheap. Check out Morrison Fabrication. They sell a hot parts kit. I'm unsure if they sell the downpipe alone. Your parts list is pretty good. I would upgrade head studs to arp and make sure all the maintenance is good. Like the timing belt, tensioner, and water pump. Are you keeping emissions related stuff? Also, are you running a stock motor?

I had all the preventive maintenance done. And my 20g actually spun a rod bearing. I currently make 530whp with a hx35. Just be careful. I'm using DSMLink for the boost control.

Another part you didn't mention was cooling. I have custom rad setup. But you might need a 1g rad in your 2g. The factory fans won't fit. You can fit 1 but not both. Make sure you have a good fan.
 
Last edited by a moderator:

Chris_decker01

Probationary Member
3
0
Sep 14, 2021
Dublin, Virginia
I purchased arp head studs , hks stopper type head gasket, kelford 272,272 cams , I bought a set of brain crower dual valve springs/kit cooling wise I have a mitsumoto dual core aluminum radiator with matching shroud/fan kit although I was told I can only use 0ne fan for clearence purpose, while using the hx35. I've pretty much purchased everything to do the swap some odds and ends I still need to get. Waiting on Safelite to put a new windshield in my car friday and then I will be putting it in my grandfather's garage for the winter to pull the motor, timing belt ,water pump and doing a balance shaft delete as well while it's out. What is your thoughts on using my stock intake apposed to a aftermarket ? Also throttle body ? Wanting to run e85 , I have a set of fic blue max 1800cc e85 injectors in my cart haven't purchased yet , wanting to make sure that is the right route to go before making the bigger purchases. Thanks for the reply man especially from someone actually running the hx35
 

1990TSIAWDTALON

Moderator
8,195
4,078
Nov 14, 2013
Independence, Kansas
You are running a FMIC, aren't you? I didn't see anything about your intercooler setup.
Also, the twin scroll is actually a good thing, it makes that turbo spool faster than an open flange setup.
Here is my son, with a HX35/Twin Scroll @MorrisonFab manifold and that thing spools quick!
He melted a piston ring land on that run (he dialed in too much timing, unbeknownst to me) on a fresh 7 bolt I built for him, but you will see how quick he gets out of the hole!
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ErikTande

Supporting Member
1,441
433
Dec 17, 2012
Centennial, Colorado
It's a killer turbo, stick with the twin scroll, you'll love it. I just made 460HP with my hx35 on a bone stock motor. Walbro 450, 1000cc injectors. I did like 4 install videos that will give you a general idea of a few of the things involved. Just search "Hx35 dsm turbo upgrade" on youtube.


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NOSLO2PT0

Proven Member
2,597
193
Aug 31, 2002
Joliet, Illinois
I purchased arp head studs , hks stopper type head gasket, kelford 272,272 cams , I bought a set of brain crower dual valve springs/kit cooling wise I have a mitsumoto dual core aluminum radiator with matching shroud/fan kit although I was told I can only use 0ne fan for clearence purpose, while using the hx35. I've pretty much purchased everything to do the swap some odds and ends I still need to get. Waiting on Safelite to put a new windshield in my car friday and then I will be putting it in my grandfather's garage for the winter to pull the motor, timing belt ,water pump and doing a balance shaft delete as well while it's out. What is your thoughts on using my stock intake apposed to a aftermarket ? Also throttle body ? Wanting to run e85 , I have a set of fic blue max 1800cc e85 injectors in my cart haven't purchased yet , wanting to make sure that is the right route to go before making the bigger purchases. Thanks for the reply man especially from someone actually running the hx35
Get an aftermarket intake manifold. Without one, upgrading springs is almost a waste, as there is little power to be gained above 7k with the stock intake manifold. Once you put the aftermarket intake on, rev to the moon, and make power the whole way there!

As far as your cooling goes, you CAN use two fans. The driver side fan will have to be aftermaket slimline, in a pull configuration. Wire both fans to turn on when the ecu tells the passenger side fan to kick on, using a relay to control both fans at once. Make sure you get a good slimline fan with plenty of CFM to keep the car cool.

Keep the stock throttle body. Aftermarket ones leak, shafts break, and guys have gone 8's on the stock one. No reason to upgrade it, unless it's completely junk. Then just buy another OEM one or rebuild yours.

Are the FIC 1800's Hi-Z? if you can swing it, get the 2150's. You can grow into those and will almost never run out of fuel ( until you start approaching the 800+ whp range)
 

1990TSIAWDTALON

Moderator
8,195
4,078
Nov 14, 2013
Independence, Kansas
If you run 2 fans, run 2 relays triggered by the same source. The factory relay is meant for 1 fan and 2 will draw more current than that relay is rated for, just to clarify.
On my 1g, I don't have enuf room to run a puller on the drivers side so it is a Spal pusher fan.

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Chris_decker01

Probationary Member
3
0
Sep 14, 2021
Dublin, Virginia
It's a killer turbo, stick with the twin scroll, you'll love it. I just made 460HP with my hx35 on a bone stock motor. Walbro 450, 1000cc injectors. I did like 4 install videos that will give you a general idea of a few of the things involved. Just search "Hx35 dsm turbo upgrade" on youtube.


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Just watched the videos thank you great channel you have setup

Also emmison
Most downpipes for the vband housings are custom and normally not cheap. Check out Morrison Fabrication. They sell a hot parts kit. I'm unsure if they sell the downpipe alone. Your parts list is pretty good. I would upgrade head studs to arp and make sure all the maintenance is good. Like the timing belt, tensioner, and water pump. Are you keeping emissions related stuff? Also, are you running a stock motor?

I had all the preventive maintenance done. And my 20g actually spun a rod bearing. I currently make 530whp with a hx35. Just be careful. I'm using DSMLink for the boost control.

Another part you didn't mention was cooling. I have custom rad setup. But you might need a 1g rad in your 2g. The factory fans won't fit. You can fit 1 but not both. Make sure you have a good fan
Also
Most downpipes for the vband housings are custom and normally not cheap. Check out Morrison Fabrication. They sell a hot parts kit. I'm unsure if they sell the downpipe alone. Your parts list is pretty good. I would upgrade head studs to arp and make sure all the maintenance is good. Like the timing belt, tensioner, and water pump. Are you keeping emissions related stuff? Also, are you running a stock motor?

I had all the preventive maintenance done. And my 20g actually spun a rod bearing. I currently make 530whp with a hx35. Just be careful. I'm using DSMLink for the boost control.

Another part you didn't mention was cooling. I have custom rad setup. But you might need a 1g rad in your 2g. The factory fans won't fit. You can fit 1 but not both. Make sure you have a good fan.
Also emissions is not a problem car is/ will be fully track driven.
 

jpmxrider489

Supporting VIP
2,267
72
Apr 4, 2010
pittsburgh, Pennsylvania
I do have a aftermarket intake. However it's not needed. The stock one is capable. I have a s90 throttle body but a 1g tb is a upgrade for 2g. Also 2g have less room for fans than 1g. If you look at my rad, I tucked it under the support.

The last thing I forgot to ad, make sure your oil drain is correct. It needs to be -12 or 3/4. Morrison sells a kit for it. Kind of a tight fit but the drain is important.
 

1990TSIAWDTALON

Moderator
8,195
4,078
Nov 14, 2013
Independence, Kansas
+2 on the @MorrisonFab drain, I have 2 since 2 cars are running Holsets. They are a real nice piece and a lot easier to work with than a big -12AN line. :thumb:
 
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