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HX-40

bigchevy89 said:
Has any one ever tried or ran an hx-40 turbo?
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I don't think there would be much reason unless you are racing and have a well built truck. A HX-35 already has alot of lag and a HX-40 takes even longer to spool. It takes alot of fuel and a strong engine to take all of the boost the HX-35 can provide.
 
it would be laggy as hell and once it lit it would be very hard on your engine unless you got one properly built for the type of driive pressure and cylinder pressures a hx-40 would produce.
 
it did not seem to me that the hx-40 was any larger then the ATT. so i did not think there would be that kind of lag.and as far as the boost it is a wastegated turbo.
 
kojo said:
Maybe first in US, but not in world.. there is at least one suburban in finland with holset hx-40 super http://www.turbotekniikka.fi/images/stories/superhx40/kuva1.jpg
I dont know what is situation right now, but last time when i saw it it was making too much boost to drive..
And that holset doesn't have wastegate
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This it what I thought. Some make a hybird out of them though with a HX 35 to make a wastegated turbo. Atleast I think this is how they do it.
 
Some are wastegated. I know my grandfathers motorhome with an 8.3L has a wastegated HX-40W on it.
 
IF I had one i would definitley try and let everyone know how it worked. Iam just looking for something deffrent and new, everybody like to experament.
 
HX40 looks good, dont know why it would lag, its not very big. It has convenient T3 mount, 3" Vband clamp, 4" inlet and 3" output to the intake is nice. I guess wastegate is full open at 20psi? Seems as though there are some knockoffs not from Holset though, calling them HX40, new for $300. Thats worth a try. Anything a Cummins can drive our 6.5 can.
 
bigchevy89 said:
heres the wastegated modelView attachment 22047
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Yep, it came stock on the 98.5-02 5.9L CUMMINS with a 5 speed, and I believe the 6 speed HO in those years(some of the last autos also had it). It is also used on the 8.3L CUMMINS in medium duty apps up to 330HP for motorhomes in those same years. It has an achilies heel though, i is a hybrid HX35W turbo in all respects. The center cartridge of it is the same as the HX35W, except they hung the larger 40MM impeller on it. This has resulted in quite a few snapped mainshafts in them with the guys in manual shift trucks. It works best when it is held at a fairly constant RPM as rapid changes in boost can and have on numerous ocasions snapped the mainshaft. It is available with a couple of different exhaust housings on it as well IIRC. The 5.9L trucks use the 12CM exhaust housing I believe like the HX35W used. And even coupled with the 8.3L it is pretty laggy, but boosts very well down low into the RPM range.
 
even coupled with the 8.3L it is pretty laggy, but boosts very well down low into the RPM range.
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How can it be both laggy but boost well down low in the rpm range.

Isn't that a contradiction or am I missing something. And it would probably be fine with a A/T. as you don't have the rpm fluctuation of a M/T.
 
robzombie4551 said:
How can it be both laggy but boost well down low in the rpm range.

Isn't that a contradiction or am I missing something. And it would probably be fine with a A/T. as you don't have the rpm fluctuation of a M/T.
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I know my grandfathers motorhome is a 94 with a 300HP 8.3L in it. When you stomp the pedal there is a noticeable delay in it before the anoroid will allow the fuel to come in. Also bear in mind this is with an ALLISON WORLD 3560 trans 6 speed with a built in retarder brake and LOW stall torque converter(about 1300-1400 I believe). Once it comes up on boost it pulls nicely down to about 1350 before it really begins to come off boost, but this is an engine with a 2300 redline.
 
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