HY35 to HX 40

[Wolfgang]

Has anyone tried putting an HX40 on a 2nd gen cummins. I have access to a used HX40 and was wondering what it would do for the Cummins since it has an HY35 on it now

 

[Steve St.Laurent]

Moving this post to the 24v forum where it will get more responses. To answer your question though, there are LOTS of guys that have put HX40's on the 24v engines - try doing a search on HX40, you'll find a ton of threads on it.



-Steve St. Laurent

Lead Moderator

 

[work2muchplay2little]

The primary reason for installing an HX-40 is to control soaring EGT's from boosting the fueling. It is able to move considerably more air than either the HX-35 or HY-35 at the same boost levels. On the down side, since the exhaust turbine is larger, it takes more exhaust volume to spool it up and this is manifested as "lag" at low rpm levels. There have been various attempts to reduce this lag by shaving metal off the turbine fins, but a number of these have failed prematurely. KWIKKURT has put together an HX-40 that is suppose to overcome the lag without weakening the integrity of it. It does need a 4" downpipe, but other than that is a bolt-on. Hope this helps.

 

[zman]

DRytting -



Steve is right, lots of folks are running HX40's - but they are also running lots of horsepower. Unless you are planning some serious power upgrades, I wouldn't make that particular swap. The turbo lag will be horrible. I upgraded my HY to an HX35/12 and my lag is bad enough. If I were you, I'd look at upgrading to one of Piers' or Kwikkurt's quick spooling turbos. Much less lag than a stock HX40. My 2 cents...



Steve

 

[Mopar-muscle]

kwikkurts turbo uses a modied 35 exhaust housing , which uses the stock size downpipe outlet .



i'm waiting for one to show up here to give it a try .



but yes turbo lag is the downside to the hx40 , but running the hx40 and using an hx35 as the small turbo on a dual setup ... now thats something i may try ... i wonder how an hy35 would work in this application ???

 

[Wolfgang]

Whoops I passed along the wrong information. The used turbo I have access to is an HX35 not an HX 40. Same question again has anyone done this mod and is there any benefit to the change out

 

[Andy Redmond]

Yes this is a good upgrade. You will add a small amount of Turbo lag, but this turbo was the oe unit on most all rams until the HY35 showed up on the recent trucks. You can lower your egt's somewhat. Even more with a turbine housing change to the larger 14cm2, 16cm2 (non-wastegated).



If it has some miles, check the end play of the pinwheel /compressor and the "sideplay" clearance to assure it's good health.



Good luck.

 

[bigbrassmonkey]

does kwikkurt have a sight?