Hx-40g

[ziffle]

Can anyone tell me if this turbo is worth considering? I have a '90 Dodge 3500 2wd stick,non I/C. Just installed a set of 4 inch stacks horizontally along the running boards. Looking to install a power(whatever) intercooler. Happen to see this turbo on e-pay. Is it worth looking into? Thank in advance,way to much knowledge for me to grasp all at once here.

 

[cerberusiam]

On a VE pump engine, I wouldn't unless you are going with some major injectors and pump upgrades. Even then it is still going to be laggy, smoky, and hot until you get the rpm's up. A much better choice would be an HE351 off a 04. 5-07. 5 Cummins in the Dodge trucks.

 

[calebhaney]

My brother blew up his 2001 rig truck,so he bought another 2001. Both have the hx-40 on them. He will give me one for free. My truck still has the stock 21cm housing on it. A hx-40 is alot smaller than that, how would it still lag that bad?Would the lagging be any worse than on my 21cm?Thanks

 

[cerberusiam]

My brother blew up his 2001 rig truck,so he bought another 2001. Both have the hx-40 on them. He will give me one for free. My truck still has the stock 21cm housing on it. A hx-40 is alot smaller than that, how would it still lag that bad?Would the lagging be any worse than on my 21cm?Thanks

HX-40's are meant for the larger engines, is that what the rig trucks are? Commercial class trucks?



The 40's may have a smaller turbine housing but that does not mean they will work well, and, yes the spool on an HX-40 would be worse the the H1-C in your truck. It has a lot to do with inducer wheel and the compressor map also.



The HX-40 hybrids which is essentiall the 40 wheel on the 35 shaft and turbine are agood compromise if you push enough fuel to them. Otherwise they will be laggy.

 

[calebhaney]

Its just a normal 5. 9 3500 dually with injector, and pump upgrades. What if i just used the housing from it?Would that help at all?Keep my factory compressor?

 

[cerberusiam]

Its just a normal 5. 9 3500 dually with injector, and pump upgrades. What if i just used the housing from it?Would that help at all?Keep my factory compressor?

If the turbos off the the 2001's are stock they will be HX35's with a 12cm housing, could have a 40 inducer on them but will still be the 35 hot side. In that case, you should be able to swap the whole turbo over and with a little tuning it will work pretty well.



If they are stock inducers 30 psi is going to be the top of the map on them but thats 10 more than what you have now.

 

[dpuckett]

I ran a HX35/40 hybrid on a 92 with stock injectors, and it spooled just fine. Like Greenleaf said one time, "lag" is a relative term. One person's lag pig may be another's fast spooler. Personally, I dont think an HX40 would be a bad choice for a 1stGen- less back pressure and better airflow than the baby H1C on there now. I'd have to respectfully disagree about the HE351W from an early 3rdGen- I think the 9cm housing would be too restrictive, and negate any gains you'd see on the intake side. I've run 12cm housings on HX35/ H1Cs, and have lost performance- always gained a MPG or so going back to a 16-18cm.



Lag can also be pertially alleviated by tuning your fuel delivery. Takes fuel to spool the turbo.



Daniel

 

[cerberusiam]

I ran a HX35/40 hybrid on a 92 with stock injectors, and it spooled just fine. Like Greenleaf said one time, "lag" is a relative term. One person's lag pig may be another's fast spooler. Personally, I dont think an HX40 would be a bad choice for a 1stGen- less back pressure and better airflow than the baby H1C on there now. I'd have to respectfully disagree about the HE351W from an early 3rdGen- I think the 9cm housing would be too restrictive, and negate any gains you'd see on the intake side. I've run 12cm housings on HX35/ H1Cs, and have lost performance- always gained a MPG or so going back to a 16-18cm.



Lag can also be pertially alleviated by tuning your fuel delivery. Takes fuel to spool the turbo.



Daniel

Too little back pressure, too little spool on the inducer. A hybrid 40/35 is not the same thing as a true HX-40, different animals and they do not react the same way.



The early 3rd gens had the HE341 which is only a slight step better than an HY-9. Much smaller gap for fuel control and not a very good map for 30+ psi. If you run at 20 psi there are no isses and it will spool much better than the H1C's.



The later 3rd gens turbos are the ones for the cheap upgrade, HE351 and HE351W. These have a bigger inducer with extended tip turbines for better flow. They will flow comparable with the early HX 12cm and have much better delivery of charge air. They support a hot 500 HP on a CR and 400+ HP without EGT issues and right a 1:1 boost to DP. More than adequate for a good running VE truck.



Its not all about the inducer\exducer and housing sizes, but, more about how it handles the flow and generates boost across the map.

 

[JLEONARD]

I have more of a tendancy to agree with Daniel that the HX40 would work out ok.

However changing to ANY other turbo won't do much until you change that crappy little crossover pipe for something larger in ID to allow air flow into the engine. When I upgraded mine to full 3 inch that was a huge gain for me.

Eliminted most of the "relative lag" and let the engine turn up with low egt.