Holset HX35 turbo?

J-bird

J-bird

Member
I'm just starting to put My typhoon back together with the built motor and I'm starting to think that my Waller 57mm stock upgraded turbo will be too small for my build. A good friend gave me his old turbo off of his '03 dodge cummins, It's a HX35 with a 12cm exhaust housing. does anyone have any good information on this turbo? Do you think it will spool ok?

My build consists of:

Stock Block
Cryo treated stock crank
4bolt mains
2 bolt billet front main cap
Eagle rods
JE pistons
Vortec heads w/bigger valves
412 cam
65 lb injectors
ck performance Stage 2 700r4
The torque converter is a stock rebuild that was setup to stall at 2500 rpm behind a LT1 engine, so I'm hopping that it will stall at 2800 with the amount of torque I'll be making.

I'm running code $59 so I have the ability to play with the tune to help it spool.

Do you guys think this turbo will work?

Thanks,
 
Last edited:
bezerk

bezerk

New member
Re: Holset HX35 turbo?

A diesel turbo won't work. those are made to run at more that 30psi. you won't be able to spool the turbo.

J-bird said:
I'm just starting to put My typhoon back together with the built motor and I'm starting to think that my Waller 57mm stock upgraded turbo will be too small for my build. A good friend gave me his old turbo off of his '03 dodge cummins, It's a HX35 with a 12cm exhaust housing. does anyone have any good information on this turbo? Do you think it will spool ok?

My build consists of:

Stock Block
Cryo treated stock crank
4bolt mains
2 bolt billet front main cap
Eagle rods
JE pistons
Vortec heads w/bigger valves
412 cam
65 lb injectors
ck performance Stage 2 700r4
The torque converter is a stock rebuild that was setup to stall at 2500 rpm behind a LT1 engine, so I'm hopping that it will stall at 2800 with the amount of torque I'll be making.

I'm running code $59 so I have the ability to play with the tune to help it spool.

Do you guys think this turbo will work?

Thanks,
Click to expand...
 
J-bird

J-bird

Member
Re: Holset HX35 turbo?

bezerk said:
A diesel turbo won't work. those are made to run at more that 30psi. you won't be able to spool the turbo.
Click to expand...


Mustank 2.3L svo guys run them all the time with good results. what is different about a diesel turbo?
 
bezerk

bezerk

New member
Re: Holset HX35 turbo?

J-bird said:
Mustank 2.3L svo guys run them all the time with good results. what is different about a diesel turbo?
Click to expand...

diesels have higher compression so they prolly have alot more flow. the design is completly different. but if you got the knowledge that the 2,3 mustang guys run it, be my gast and post results i'm just telling you what i think.
also the exhaust housing is normally way bigger of a diesel turbo.
 
H-TOWN-TYPHOON

H-TOWN-TYPHOON

You're killin' me, Smalls
Re: Holset HX35 turbo?

44446d1104971598-holset-turbos-compmapmy3a.jpg


hx35 in green
 
J-bird

J-bird

Member
Re: Holset HX35 turbo?

bezerk said:
diesels have higher compression so they prolly have alot more flow. the design is completly different. but if you got the knowledge that the 2,3 mustang guys run it, be my gast and post results i'm just telling you what i think.
also the exhaust housing is normally way bigger of a diesel turbo.
Click to expand...


I'm not arguing there, everything I have heard about this turbo is hearsay. I haven't heard anyone with firsthand knowledge on this turbo, and I sure don't trust any ricer or SVO forums! It's just so tempting since it's a free turbo!

Thanks
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: Holset HX35 turbo?

get the compressor map and work out your fueling and desired performance to work out if this is the right turbo for you.

the green lines are efficiency, starting at the higher efficeeincy towards the centre of the green area and the further you get away from the centre of the green thumbprint, the less efficient you get.

Imagine a dot in the middle of the green area, that is where you want your performance to sit.

You need to work out how much you are going to flow and at what pressure to get an idea of where you will sit on the graph with the turbo performing attached to the engine.

You should read up on it but if you are too far from the centre to the right then you lose efficiency due to back pressure and compressability, too far left/low and you are underboosting and won't spool up properly.

The pressure ration along the side is the ratio of inlet air to outlet air. OUT/IN = PR. So if your output is 30psi and you are taking in from atmosphere at 15 psi (cold day, high pressure system!) then your PR would be 2.

The fact that the curve goes all the way up to a PR of 4.4 suggests this turbo will output very high boost pressures consistent with a diesel and that you are not very likely to get good spoolup from the turbo.

Your truck will prob work at around a PR of 1.5 max - (say 22.5 psi) and the vortec heads flow about 235 each, so 470 for the engine....so yo uare sitting right on thr bottom right of the compressor map. Not very well suited to your engine it would appear.

I have defintely got something wqrong there - anyone care to elaborate or correct me?

NB The blue horizontal line is the anticipated performance of the engine at optimum performance - you can see that it goes roughly through the middle of the sweet spot of the turbo. Your engine is way below that and won't get the benefits from this turbo.
 
Last edited:
Dr.Evil

Dr.Evil

Addicted to Boost
Re: Holset HX35 turbo?

If you don't want the HX35, let me know. I'll give ya more than you paid for it, and pay for the shipping. This is a fantastic turbo for us turbo dodge guys, tried and true as a great match for the TIII motor in my Spirit R/T. I have a T3/T4 50 trim hybrid that I was planning on putting in, but if I can get this holset from you I would much rather go that route.
 
turbodig

turbodig

Active member
Re: Holset HX35 turbo?

MikeRenz said:
no, no, and no.

read this:
http://forums.bimmerforums.com/forum/showthread.php?t=258035
its a decent compressor map for dummies intro
Click to expand...


There's one at the GN site too....
http://www.gnttype.org/techarea/turbo/turboflow.html


It's odd to see a map specified in volume (CFM), vs. lb/min. Doesn't really give you a good indication of how much HP it would support. And, no efficiency islands?

Only thing *bad* that I see with this, is that there's some surge potential at lower boost. Hard to tell where it'd happen without having a density-based compressor map. It's definitely set up for higher boost operation, since the edge of the map is up in the 4.0 pressure ratios.

I wrote a little calculator app for doing compressor calcs, you can get it here:

http://digware.lunarpages.com/files/turbocalc.exe


It'd be an interesting turbo experiment to try...
 
J-bird

J-bird

Member
Re: Holset HX35 turbo?

I think I'll just run the Waller turbo until I can afford RPM's kit with a 67mm ball bearing turbo!

Thanks,
 
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