HX40 Superturbo

[Archive]

Again where getting back to, All testing done under full throttle!
Not very relivent in day to day driving where 99% of the driving is done by most all rammers.
I do not disagree that back pressure inhibits power.
It is only a problem at full throttle.
The soggy performance I experienced is due to two things, the lower operating rpms and lack of boost at those rpms.
I had plenty of fuel as shown by the black fender on my truck, the trail of smoke, and poor fuel economy when I tried to tow in double overdrive.
It was nesecary to tow in fith, and keep the rpms at 2300 or higher.
The lack of boost is caused by too large a turbine housing for the size of the engine and rpms at which the are run.
Hopefully the 16cm2 equipped HX40 will be the sweet deal.
Time will tell.

Ted Jannetty

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Ted Jannetty, Owner President Jannetty Racing Enterprises Inc.
97 3500 4x4 club cab 5spd. RED, JRE stage 3 power kit, JRE 4" exhaust
JRE 1/2 inch fuel system, Cummins 300 hp injectors, Prime loc,
Cummins chrome kit, US Gear 20% over drive, 3. 54 posi, Autometer
gauges, boost, and Pyrometer, BD exhaust brake.
97 Ski-Doo 670 turbocharged
99 Honda Forman 450 ES

 

[Archive]

I got the turbo installed today. WOW! Only have the down pipe on and man, it's loud!

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'00 2500 RAM, RegCab, 4x2, Cummins, 6-spd, Driftwood/Agate...

 

[Archive]

Michael T,


What kind of boost numbers are you getting. (before and after)What injectors, and boxes do you have.

 

[Archive]

yes micheal , please tell , which turbo housing did you install and what are your before and after numbers , i'm thinking of getting a 14cm for my HX35

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John W. in Mass.
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Y2K 2500,QC,4x4,SLT+,CUMMINS,Auto,TT,CS,3. 54 LSD,Driftwood,Camel LEATHER + LOADED,Line-X,silencer ring in the glovebox,aspiring to BOMB !

1969 Dodge Superbee, Black on Black, 383, 4spd, BOMBed !!

 

[Archive]

With a bigger turbine housing, boost numbers will be lower. However, pumping losses are also lower, so if enough boost is produced, you haven't lost anything, and may have attained improvements in hp, egt reduction, and even mpg.

On the test 5 speed, mpg went up a bit, boost went down under moderate loads, and egt also went down.

TST is looking into making a customized version of the PowerMax to work with the Superturbo and give good response without clouds of smoke.

 

[Archive]

I've been somewhat hesitant to post too soon, for I want to make a thorough asessment of the configuration. One thing to remember is that the HX40 has both a larger turbine (16cm2) and compressor, so the truck will drive a little different. My current configuration is a 2000 ISB, TST PowerMax, Bosch 275 injectors, and Holset HX40/16cm2 housing, with the latest addition being the turbo. Since the ISB has an electronic air-fuel controller, it will take some tuning to get it right with the HX40 (hence, TST modification). I installed my 5" exhaust today, and it looks and sounds great!

I will be posting pictures of everything to my website soon, along with a full summary of the results. Initial impression... very happy. I lost a little neck snapping acceleration in the lower end (something I really don't need), but I have gained more acceleration on the top end. EGTs previously hit over 1350 F, but will now only max out at 1100 F. Power is extremely smooth without a touchy throttle.

-Michael

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'00 2500 RAM, RegCab, 4x2, Cummins, 6-spd, Driftwood/Agate...

 

[Archive]

Since our Rams don't have throttles, all our driving is done at full throttle. After seeing Piers' videos, I realize that all his driving is done at full throttle, full rack position, AKA "earnest fueling. " I asked him about this, and he said he didn't realize there was any accelerator pedal or fuel rack position between idle and full load. Hmmm.
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hehehehe, with a real injection pump, you DEMAND fuel, not request it by wire.

If in doubt, watch his videos again.
Spin that turbo! #ad
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[Archive]

Does the HX40 slip right into the stock intercooler hose? What are you using for a Head pipe? I have all the parts in to start on my 5" exhaust but after reading this for the fourth time I think I might want to try one.

Tom


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96 2500 4x4 nv4500 3:54 slt 3"body lift 2. 5" suspension by skyjacker dual steering stablizers dual front shocks 267/75/16 street tires 36/12. 5/16 swampers for mud silencer ring lost along with muffler res/cat 3" straight pipe KN round style filter JRE stage 2 kit 330/730 JRE afc spring kit boost and pyro gauges

 

[Archive]

The Superturbo will come already clocked for the B engine, that is, the compressor and exhaust housings are turned to the correct angles. The compressor housing bolts right to the aluminum elbow going to the intercooler. The exhaust housing bolts to the exhaust manifold. The oil pressurized feed and the drain pipe both bolt on. It comes with a custom built downpipe and a 4" stainless band clamp. After the downpipe, use commercial straight sections and bends to make up the rest of the system, or you can buy an aftermarket 4" tailpipe ato supplement the pipe sections and muffler you choose. In short, it bolts right up except for the exhaust system, hence the custom 4" downpipe. #ad

 

[Archive]

What are the advantages of keeping the wastegate hooked up. Why not just plug the line? Also is there a max boost not to exceed? I can pull 37lbs with the bleed off fitting that I have in now.

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96 2500 4x4 nv4500 3:54 slt 3"body lift 2. 5" suspension by skyjacker dual steering stablizers dual front shocks 267/75/16 street tires 36/12. 5/16 swampers for mud silencer ring lost along with muffler res/cat 3" straight pipe KN round style filter JRE stage 2 kit 330/730 JRE afc spring kit boost and pyro gauges

 

[Archive]

Probably about 45 psi boost is the max useful amount. If you don't exceed that amount, you can install the wastegate pot and bracket, and leave the pressure line off. The more boost, the more careful you need to be on deceleration from high boost power. The pressurized air in the lines and intercooler will try to spin the turbo backwards if it suddenly quits producing any boost. This is hard on the turbo bearings.

 

[Archive]

There is NO point in using the wastegate function on the HX40 with either the 18. 5 or 16cm2 housing!!! Dont waste your time fooling with it, have it welded shut by a metal shop. #ad
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p. s. >>then get rid of that pesky actuator and rod... .

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No high tech fuel system needed. Just good old fashioned diesel power!!
<<>>Charles Pyatt<<>>

 

[Archive]

Don't waste you time with the actuator assembly on a HX40, there is no need to do this!!! Take it and have the gate welded shut at a metal shop then remove the actuator head and rod!!! #ad
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No high tech fuel system needed. Just good old fashioned diesel power!!
<<>>Charles Pyatt<<>>

 

[Archive]

Don't waste you time with the actuator assembly on a HX40, there is no need to do this!!! Take it and have the gate welded shut at a metal shop then remove the actuator head and rod!!! #ad
#ad
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No high tech fuel system needed. Just good old fashioned diesel power!!
<<>>Charles Pyatt<<>>

 

[Archive]

I'm running a stock turbine housing - and noticed since putting in the K&N that I can hear the back-rush of air when I take my foot off the pedal with the turbo whining at full speed.

Is this back-rush bad? I just saw the part in this thread about the turbo spinning backwards. Any ideas? Should I back-off the throttle more slowly?

Okay, okay - so I should NEVER back off the throttle... but...

Greg




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Y2K Dodge Cummins QC 2500 SLT Laramie 4x4 Long Bed, 4. 10/Auto, Forest Green/Driftwood, 265x75R16 Michelin LTX, 6 speaker CD, Camper/Tow/Plow Packages, Westin Black Nerfs, Mopar bedliner, Ultra bright diamondplate toolbox, K&N Filtercharger.

Not Bombed yet!

 

[Archive]

As I posted above, the backpressure is bad if you value your turbo. Most folks get away with it because their unbombed engines put out only 18 psi max. Double that and you can get into trouble after some "indiscretions. "

Some recent, relevant posts can be found on the Superturbo under the 24 valve forum, "Comparisons, Dodge and Powerstroke engines" thread.