Engine/Transmission (1994 - 1998) new HX 40...Boost level?

[bowhunter]

I just put on a almost new Diesel Dynamics HX 40 w/ 16 cm housing with a waste gate.



I have moved the #10 plate full forward. I still have the stock 215 injectors, light AFC spring-star wheel fully forward, and full 4# exhaust.



I have the TST boost elbow in the AFC Housing, and a plug in the rubber/steel boost signal line that goes over to the turbo from the AFC Housing.



The HX 40 is supposedly set for around 38lbs of boost from Diesel Dynamics. It has a brass elbow on it with a rubber hose on it that goes to the wastegate. There is not a fitting to connect it to the rubber /steel line that goes to the AFC housing.



With this setup I can get over 40 lbs of boost which is not a good thing with an HX 40, however EGT's are much better.



The truck runs real strong... I can't wait for the 370's!



Do I have this thing hooked up right? Should I have the turbo/wastegate connected to the line that goes to the AFC Housing? Like the HX 35/12cm. stock setup was?



I need some advice from some experienced HX40 users.



Thanks

 

[BillGotthelf]

Well you might have a problem when you put in the 370's. The hx40 should not go over 40-42 psi. I see 36 on mine but with more fuel I probably will see 40. You may have to take out the tst fitting in the air line to wastegate.

 

[thaile]

I am currently running the HX-40 with 370's and it will get to 40 very quickly. It just smacks the gauge as I only have a 40 pd gauge on the truck. 370's really pull hard up there and will definately increase the boost level. I know they are only supposed to go to around 42psi of boost but I don't know what mine is doing. I am getting ready to upgrade to a little bigger turbo to get rid of the possiblility of grenading the PDR HX-40. Then i will definately need a bigger gauge.

 

[C. Harlan]

I got mine from Piers, and they wastegated it at 45 PSI... . it may be a little high, but I rarely get it that high, as EGT's climb with the boost... What's "Efficient" boost for an HX40??



-Chris-

 

[bowhunter]

Well I didn't have a good Sunday.



After a fish fry, around 8:30 at night, I took a buddy for a ride in the truck... I got clocked by a state trooper @ 78mph in a 55 zone. He gave me a 70 in a 55.



I was shifting into 5th as I went by him. He was sitting at a gravel road crossing (all lights off) at the end of a long straight away on a country road in B. F. E.



I was feathering the throttle to keep it below 45 lbs of boost. If I would of really got into it I could have easily seen 50 lbs. I definitely need to do something to lower the boost. As I mentioned before the TST brass fitting on the AFC housing is closed and the line going to the turbo is plugged because the new HX40 does not have a connection on it.



The HX40 has a brass elbow (no allen screw) with a rubber hose clamped to it. This hose goes to the wastegate. The brass elbow on the X40 is supposedly made for 38lbs.



I don't know if there is anything I can do, or anyway to hook this turbo up differently to lower the boost. I think I will have to control it with my right foot.



At this point should I eliminate the line from the AFC to the turbo? ( The line that is rubber and then turns to steel as it goes over the top of the engine to the AFC housing)... . or should I put in a "t" fitting between the wastegate and brass elbow on the HX40 and connect it to the AFC housing boost signal line,... then open the allen screw on the TST elbow and adjust it out to where I see around 38-40 lbs of boost under hard throttle?



Has anyone done this?



Thanks

 

[John L]

Bowhunter-

I'm having the same issue with my PDR HX40-16. I can easily run pass 45 lbs of boost if I'm not careful. I've tried to control the boost by lengthening the wastegate canister arm but all I noticed was that it caused some lag around 20 lbs and the boost was kind of jumpy too. I came to the conclusion that the wastgate opening isn't large enough to allow adequate amount of gas to escape. One member suggested boring out the waste gate some but I'm not sure if I want to try that.



John

 

[KLockliear]

Remove the "C" clip on the end of the actuator rod and turn the rod in (toward the actuator) a few turns - start at 2 turns and turn in until you can get WOT and <38psi. If you can't, we'll send you another elbow to bring it down.

 

[bowhunter]

Thanks Keith



I'll give that a try.



I appreciate your help.



Kurt