PDR HX35/HX40 adapter questions...

[jtisdale]

If you have the need to install an HX35 or HX35/40 Hybrid turbo on a truck with an HX40 downpipe, this handy little HX35 to HX40 downpipe adapter will do the trick.

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Picture from Piers website.

My question is, could this be turned around, so I could use my turbo mount Pac brake on a HX40?

 

[Bob Wagner]

I just put the 2 pieces together, looks like it would work. are you going to use a 3" downpipe?

 

[jtisdale]

I have the 4" exhaust but it is flanged to bolt to the stock 35.

 

[Bob Wagner]

looks like a match then

 

[jtisdale]

Thanks Bob!

 

[Wheaties]

This will probably work, but why would you want to put that kind of restriction on an HX-40? Aren't you defeating the purpose of putting a 40 on in the first place? Won't the restriction put your EGT's right back to where they were before you put the 40 on?



Also, have you considered that there may be an issue with the spacing? The elbow is designed to fit right up against the turbo. If you have to bend the downpipe to fit the adapter in, the parts may not mate properly.



Please don't think I"m knocking your idea, just asking a question here. I just upgraded to the 40 and bought a new downpipe and a 4" exhaust brake to make things right. I'd be surprised to discover I could have gotten away with a small adapter.



Matt

 

[jtisdale]

Yes, you are probably correct about not gaining too much. Financially, I can only swing the turbo right now. I can rework the exhaust to fit correctly and there appears to be plenty of room to the firewall. When I get my 3" brake sold, then I can get a 4" and do it right. But until then I have to try it this way. Or, I may just buy the turbo and wait till I got the coin to change it all.

 

[Straight6Jeff]

Matt, hows the 40 working out for you? how about the brake? When I mount your old brake (on the truck that is), I'm gonna use the throttle pedal switch to activate the brake rather than the ecm connector. I figure I already have the switch so I might as well use it.

 

[HEMI®Dart]

I had my co-worker turn one of those on his lathe 3 years ago after I blew up an HX40 and didn't want to change the downpipe to put the OEM HX35 back on. It saved alot of aggravation



The truck felt stronger with the HX35 dumping into a 4" down pipe. I thought I noticed a marked difference.

 

[Wheaties]

Originally posted by jtisdale

Yes, you are probably correct about not gaining too much. Financially, I can only swing the turbo right now. I can rework the exhaust to fit correctly and there appears to be plenty of room to the firewall. When I get my 3" brake sold, then I can get a 4" and do it right. But until then I have to try it this way. Or, I may just buy the turbo and wait till I got the coin to change it all.

Right, my original plan was to get the right down pipe and sell the exhaust brake. Then splice in the new brake when I could afford it. Luckily, the swap coincided with my annual bonus. The downpipe is about $150, why wouldn't you do without the brake for the time being?



Matt

 

[Wheaties]

Originally posted by Straight6Jeff

Matt, hows the 40 working out for you? how about the brake? When I mount your old brake (on the truck that is), I'm gonna use the throttle pedal switch to activate the brake rather than the ecm connector. I figure I already have the switch so I might as well use it.

The new turbo is pulling strong. I always seem to go through a short period after a change where the engine sounds like a bucket of rocks while I wonder if I bolted everything down right. The turbo is doing what it's supposed to do, more power with less boost/lower EGT's. Give it about a week and I'll be very, very happy with it.



The brake definitely needs adjusting. I'm putting together the parts to make a gauge. We need to close the valve till it reads 60psi back pressure Max, this is at the governed rpm of the engine. I also seem to have a leak in the air lines as the compresser runs every morning at startup.



Jeff you should also have the harness to connect direct to the ECM. It's your choice, I'm not sure if you get the delay with the microswitch or not, but I don't seem to mind the delay from the ECM. Let me know if I can help with the install.



Matt

 

[Wheaties]

Originally posted by HEMI®Dart

I had my co-worker turn one of those on his lathe 3 years ago after I blew up an HX40 and didn't want to change the downpipe to put the OEM HX35 back on. It saved alot of aggravation



The truck felt stronger with the HX35 dumping into a 4" down pipe. I thought I noticed a marked difference.

Hey Hemidart, long time no see. Yes, I agree that the HX35 pulled pretty good with the 4" pipe, talk about instant spooling!! But I had to conclude that the new injectors had to be too much for it. I'll still pick up one of these adapters just in case I need one in an emergency.



Matt

 

[Wheaties]

StraightSixJeff!,



Thanks again for all your help! I couldn't have done it without you! You do nice work!!!



Matt

 

[jtisdale]

The brake has me spoiled. Besides, its just shy of a year old. I have a few buddies that may want it, but I want one to put back on when this one comes off.



Originally I was planning on a PDR35, but this deal with the PDR 40 came up.



Who makes a 4" turbo mount brake? I really dont want an inline if I can help it.

 

[HoleshotHolset]

Jim said: "Originally I was planning on a PDR35, but this deal with the PDR 40 came up. Who makes a 4" turbo mount brake? I really dont want an inline if I can help it. "



Jim: Didn't we talk about this for a while? From what I gather... you don't tow much with your truck, so here's my take on the situation... again.



Going without a brake for a while, IMHO, is much better than necking down the turbine outlet just to make the brake work. If you neck down the outlet just for the brake... you're loosing out on the whole reason you slapped the 40 on there in the first place.



AFAIK, nobody makes a 4" turbo mounted brake.



You're going to take a hit in the pocket or in performance no matter how you look at it.



Sell the 3" PacBrake for $500 or so - someone will buy it. Save your bread for a $1000 4" inline unit... then you have the best of both worlds.



If it was my truck - you're darn right I'd try the exhaust adapter thing; I like easy solutions. However in this case, I know in the end you won't be happy with this easy solution.



MTY

 

[Forrest]

I'd say go with the 40 & the adapter. Great experiment. The 40 definately reduces EGT.



Then go to the 4" mandrel bent downpipe or adapt yours. I had a brake on the HX35, that went by by with the 40. I don't have a brake with the 40 & haven't really missed it. I've come down some pretty steep hills & no problemo. Actually, I was surprised. It held the 5'er back on compression with very little on the brakes.

 

[JohnE]

Originally posted by HoleshotHolset

...

AFAIK, nobody makes a 4" turbo mounted brake.

...

OH yee of little ... knowledge. Pacbrake makes a very nice direct mount for the 40 series turbo.

 

[jtisdale]

Originally posted by JohnE

Pacbrake makes a very nice direct mount for the 40 series turbo.

Cool, thats the one for me. At least I wont have to change my pac brake badges.

You wouldnt happen to have a part number by chance?

 

[JohnE]

Kit # C16000 is a start.

http://www.pacbrake.com/exhaust/cumminsxb.html



You have to look at ISC applications. They do require an onboard air system to function.



I've got our email somewhere thanks to cheesy (Fireman) Dave. I'll send you some photos of the ½ Marmon Direct Mount.

 

[Wheaties]

That sure looks like the brake I just mounted inline just behind the transmission crossbrace. And yes, it requires air. The kit I bought included a nice compressor identical to the one I got through Rickson for my air horns. So now I have a spare. The air horns came with a tank which means the compressor doesn't have to run every time I hit the brake or the horn.



Actually, I got kit C10300.



Actually the air is a definite improvement over vacuum. It seems to close faster, and the spring it opposes opens it right up again. Should the air fail, you know the spring will keep it in the open position.



You should also take the instructions to weld exhaust pipe seams upstream of the brake seriously. Toolman found out the neccessity of those welds having traveled that road before me.



I agree with how nice it is to have around. The one time I towed with it, I was very glad to have it coming down the mountain! But I have to agree with Holeshot. Bite the bullet and do it right!



Matt