6.9l customization
Lead Driver
Joined: Apr 2008
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Thats all but the same as my HT60, 73 ind. 107exd, 97mm turbine. that thing has a pretty gnarly lookin turbine. All joking aside.. that would work pretty well as a primary for the one you have on there in a set of compounds. But the one you have is still a tad on the small side im guessing.
Posting Guru
Joined: Sep 2011
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Mike I was actually reading Diesel Power the other day and and they actually recommended to a guy that had a 66mm turbo and was unhappy with the spool up to use it as the atmosphere turbo and to use a 57mm as the secondary. They said it would provide instant spool up and would be good for about 700hp. Also I looked up the size of the stock compound setup on the 6.4 and the small variable turbo is only 52mm and the big one is 65mm. The setup on the 6.4 is good for about 550hp even with those small turbos. Anyway what I am getting at is that your Hx35 might be more ideal than you think for the secondary. Also I think that Ht60 might go pretty well with it. 72mm turbos work pretty well as primary turbos from what I have seen on most Cummins setups. Also Turtlemann, I agree with Mike throw that thing on in a compound setup. It would spool really well and you could still limit the boost to where you want. 
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Elder User
Joined: Aug 2007
Posts: 589
Likes: 2
From: Nutter Fort,West Virginia
lol i would have to have it rebalanced, one of the tips on the compressor took a hit and knocked the corner off (how i got it for free)
i was going to use this in a diy jet engine lol
if you run 14 lbs of boost with the large turbo (assuming that it can flow enough) shouldn't the small turbo flow twice as much as what it is rated for?
i was going to use this in a diy jet engine lol
if you run 14 lbs of boost with the large turbo (assuming that it can flow enough) shouldn't the small turbo flow twice as much as what it is rated for?
Posting Guru
Joined: Sep 2011
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If I understand what you are asking, the answer I believe is no. Since the big one is feeding it with compressed air it is doing half the amount of work to build boost. If the big one is pushing 14psi that is 28.7psia. Push that into a secondary turbo doing a small amount of work at say like 10psi, that is 24.7psia or a 1.68 pressure ratio. Multiply 28.7 by 1.68pr and you get 48.2psia. Subtract 1 atmosphere from that and you get 33.5psi total boost. So as you see neither turbo is working very hard at all to produce 33.5psi of good, cold boost...
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Elder User
Joined: Aug 2007
Posts: 589
Likes: 2
From: Nutter Fort,West Virginia
so then the only point to run compounds was if i was going to push high psi
and high psi = more heat.
if i were to run dual turbos on this engine i think i would run twins or synchronic as we are not at the end of the compressor map on the pressure side.
on a separate note, bought a little engine dyno today built by my local shop for testing diesels. i will have to do some modification but it should be fully capable of anything that i can through at it.
and high psi = more heat.
if i were to run dual turbos on this engine i think i would run twins or synchronic as we are not at the end of the compressor map on the pressure side.
on a separate note, bought a little engine dyno today built by my local shop for testing diesels. i will have to do some modification but it should be fully capable of anything that i can through at it.
Posting Guru
Joined: Sep 2011
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More boost doesn't necessarily mean more heat especially on an efficient setup like compounds. Usually compounds actually lower egts compared to a single turbo because they help all the fuel burn on the bottom end by spooling faster.
By twins do you mean parallel twins or compounds? Also what is a synchronic setup? I have never heard of that before...
Also how much did that little dyno run you?
By twins do you mean parallel twins or compounds? Also what is a synchronic setup? I have never heard of that before...
Also how much did that little dyno run you?
Posting Guru
Joined: Sep 2011
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Ah I got ya. Kinda like the sequential turbo setup that Toyota Supras used to run... That would be bada$$. There is actually a guy doing a sequential setup on his Cummins. It runs a Whipple supercharger to start off and get good low end boost and then after the turbo starts to spool it bypasses the SC to reduce the parasitic drag and get its boost from the big turbo only. Its pretty cool. Now he is using that superchrager setup to spool some compounds. That guy just has some crazy sick setups!
Posting Guru
Joined: Sep 2011
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Also I have a friend here in San Diego and we are researching putting a set of small variable turbos from some of the smaller diesels on his 7.3 in a parallel twin setup. I am thinking a pair of GT2260VK turbos but I want to find a compressor map to make sure they work out. But I'm pretty sure they will. They have a 60mm compressor wheel and the turbine side can open up all the way to a .84 A/R. I think a setup like that will spool amazingly and won't overboost an Idi either. I just need to get my internet back online from when I moved. It will make it easier to find the compressor map I need on the computer. Lol
Logistics Pro
Joined: Jun 2012
Posts: 4,063
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From: Southeastern IL
Iv got a buddy I work with that has a Cummins with the "supercharged turbo" set-up. Its been at the shop more than on the road. Its very difficult to get it all to work togetehr smoothly but when its on the road, that truck will flat out haul!!! It will quite literally do a 4wd burnout lol. Won the dirt drags at the county fair oddly enough lol
Posting Guru
Joined: Sep 2011
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Nice. Is his setup custom or did he get it from Crazy Carl's Turbos? Also what type of supercharger and turbo is on it? Any other info?
Oh and another question. Lol. Why has it been in the shop so much?
I have a M112 and mount built from stainless steal that I plan on mounting on my 7.3. It will have a Vgt blowing into it too. It should be pretty cool. Do a search over at PSN or OBN and you will be able to find some pics of the mount I posted. My username on those sites is 88 Ford.
Oh and another question. Lol. Why has it been in the shop so much?
I have a M112 and mount built from stainless steal that I plan on mounting on my 7.3. It will have a Vgt blowing into it too. It should be pretty cool. Do a search over at PSN or OBN and you will be able to find some pics of the mount I posted. My username on those sites is 88 Ford.