hx35 redneck engineering
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Junior User
Joined: Oct 2012
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Racer the 40 or hybrid 40 seems like what you need. I would definitely go that route and use a bigger turbine housing.
Also what is the difference in size between an Hx35 and Hx40? The Hx35 is 57mm correct? I just wonder if they would be to close in size for compounds...
Also what is the difference in size between an Hx35 and Hx40? The Hx35 is 57mm correct? I just wonder if they would be to close in size for compounds...
Posting Guru
Joined: Sep 2011
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Ya I did a lil research myself. Those turbos seem like good turbos just cus of the variety in itself. One thought I did have though, is it worth spending the money to say upgrade like an Hx35, when the Hx35 is capable of 400+ hp already?
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Joined: Feb 2012
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From: western Oregon
Ya I see your point... I was looking at a used HX40W on craigs list had some miles but I was thinking I could get a kit to rebuild the center section. Its off a cumins 8.3 engine.. I see alot of 35's for sale, mostly from cumins guys that have beet the **** out of them then repaced them and are selling the 35 for cheep.. I just think a 14cm2 will run to hot for me.. I have a intercooler off a 06 cumins truck and i was thinking water meth for the hills might keep the 35 from running hot... I will look into the hybrid turbo might be the way to go..
Postmaster
Joined: Aug 2010
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From: Northern Arizona
Also, I googled the hx35/hx40 hybrid, and generally got the idea that the parts fit, but is self defeating from an engineering standpoint, and frowned upon by many turbo builders. I kind of dismissed the combination, but if there are real world users out there that had good results with this set up I'd like to read their opinions... any good links for 35/40 hybrid experiences?
Postmaster
Joined: Nov 2008
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From: Buckley, WA
Are we talking 400+ hp out of an IDI? There are a lot of numbers running around out there but mostly from Cummins or rice burner applications. You guys think the hx35w is sized right (flow and efficiency etc.) to get that much hp out of a 420/444 CID IDI? If feeding a DB4 fueled engine, you think the hx35w could keep up with 180cc's? 120cc's? Anybody with this turbo on their IDI have any dyno numbers for it?
its 60mm just like the hx40, but with a/r tune ability 
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Joined: Aug 2010
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From: Northern Arizona
That's precisely what I was thinking... totally different air flow needs on the IDI. Not to say the hx35 is a poor turbo choice, but I could hardly see it supporting 400 hp on this platform. Don't mean to hijack this thread but how's your he351ve working out for you? Did you ever devise a mechanical VGT control that worked reasonably well and with some reliability? I remember reading that your spring set up had some issues...
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the 8 blade hx 40 is good for about 48-52 lb min the 6 blade will get you 60 atleast
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Junior User
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and as for the hx35/40 hybrids...people are snapping shafts from the added weight which transfers into rotational torque and gets really bad if barked but i do beilieve the hx35 62 mm comp wheel will hold 140-160 but at its absolute wits ends probably racinndrummin clears up at his 160 he had on the dyno but i believe his borg warner is a 64mm comp wheel not sure tho
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nah, racins BW is a 62, he said it was about at its limit, still hazes pretty good with 180cc
However, for stock to just over stock lets say 90cc, i think a 35 or hybrid should be up to the job. I thought a 8 blade hx40 flowed 60lbs /min? From what i found when i was looking up holset stuff, my particular 35 is supposed to do 52lbs / min.
Since were kinda on the subject, and you guys seem to know what your talkin about, what is the formula for figuring displacement x rpm = cfm / lbs / min
However, for stock to just over stock lets say 90cc, i think a 35 or hybrid should be up to the job. I thought a 8 blade hx40 flowed 60lbs /min? From what i found when i was looking up holset stuff, my particular 35 is supposed to do 52lbs / min.
Since were kinda on the subject, and you guys seem to know what your talkin about, what is the formula for figuring displacement x rpm = cfm / lbs / min
Posting Guru
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nah, racins BW is a 62, he said it was about at its limit, still hazes pretty good with 180cc
However, for stock to just over stock lets say 90cc, i think a 35 or hybrid should be up to the job. I thought a 8 blade hx40 flowed 60lbs /min? From what i found when i was looking up holset stuff, my particular 35 is supposed to do 52lbs / min.
Since were kinda on the subject, and you guys seem to know what your talkin about, what is the formula for figuring displacement x rpm = cfm / lbs / min
However, for stock to just over stock lets say 90cc, i think a 35 or hybrid should be up to the job. I thought a 8 blade hx40 flowed 60lbs /min? From what i found when i was looking up holset stuff, my particular 35 is supposed to do 52lbs / min.
Since were kinda on the subject, and you guys seem to know what your talkin about, what is the formula for figuring displacement x rpm = cfm / lbs / min
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Junior User
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nah, racins BW is a 62, he said it was about at its limit, still hazes pretty good with 180cc
However, for stock to just over stock lets say 90cc, i think a 35 or hybrid should be up to the job. I thought a 8 blade hx40 flowed 60lbs /min? From what i found when i was looking up holset stuff, my particular 35 is supposed to do 52lbs / min.
Since were kinda on the subject, and you guys seem to know what your talkin about, what is the formula for figuring displacement x rpm = cfm / lbs / min
However, for stock to just over stock lets say 90cc, i think a 35 or hybrid should be up to the job. I thought a 8 blade hx40 flowed 60lbs /min? From what i found when i was looking up holset stuff, my particular 35 is supposed to do 52lbs / min.
Since were kinda on the subject, and you guys seem to know what your talkin about, what is the formula for figuring displacement x rpm = cfm / lbs / min
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Junior User
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the hx40 6 blade is almost worth 60lb/min the 7 is worth about 55lb/min and the 8 is about 45lb/min
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scroll down a lil ways and there are all 3 maps together
How to Read a Compressor Map - Dodge Cummins Diesel Forum
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That is going to be one laggy sum-bitch