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Searched and found no mention @ all.

Not horrible in price ~$135, but would like to hear from anyone/someone who's bought one?
 

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Got this feedback via PM from someone who tried one...

smelonas said:
I guess I did something wrong, or my pump was bad. but I have NO PS now. NONE. The pump itself seems nice though. it is aluminum rather than iron/steel like the OEM one.

This website wont let me post to the thread. SO if you want, please copy paste the above for everyone to see. I am going to see if I can this work. I tried bleeding and everything, so I am truly at a loss here.
 

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I just came across this brand during my hunt for a new PS pump today...
DNJ = "Domestic 'N Japanese"

From my digging, I came up with references to their other parts, so I researched that stuff. Apparently they are a parts importing business trying to be bigger than they are and appear "American". I read a few mixed reviews. Seems their parts are of decent quality. I also discovered that they used to be named "ROCK Engine Products"... just so happens that many Chinese Government shell companies had similar names not so far removed from Republic Of China (R.O.C.).

If you Google "Rock Engine Products", 1st thing that comes up is "DNJ Engine Components", & the utilize 2 websites with very basic websites and both are vague.
DNJ Online Parts Catalog
Home - DNJ Engine Components
 

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Okay, now that my reply works.... I will go ahead and reply to this properly. Thanks Babywag for posting up my PM until I could post!

I ordered one of these DNJs off of amazon for 125 bucks. Seemed like a really good deal and all that considering it was NEW and seemed to be legit.

Well I got it in the mail Friday, and put it on Saturday. Nothing. Dead as door nail. I used to have a weak OEM pump that worked, now I have a dead new pump. Whether it was a fluke, I dont know, I dont really care. I sent my OEM one off to Lee Tuesday. He said my old one probably just had some bad seals (car sat for 4 years without turning over at all, you tell me).

Let me list off some things I noticed about the pump as I installed it and took the original out.
1. The housing is aluminum where OEM is steel/iron, I figure steel but really that doesnt matter
2. It spun well but was tight at the shaft
3. Shipped with plugs in the supply and pressure holes
4. Had some sort of lube in it to keep it from rusting I presume

Overall, it seemed really nice, the presentation was there. But I tried everything to get that stupid thing to go and it would not do a damn thing. So I put in a return request and I will get it torn down this weekend at which point I will get my rebuilt pump back mid next week. Hoo-frikin-rah!

Personally, if you have an original GM pump, have it rebuilt or get the ACDelco reman off rockauto. I cant vouch for any other company or pump at this point.

In my eyes, the only real option is to have your OEM one rebuilt. That way, you get the best possible pump money can buy.
 

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Not Good... Seems like a good price for a New Pump and and the bonus of an aluminum housing for better cooling... how "different" was it externally from the stock one? Might be worth buying and rebuilding it right out of the box... that's assuming it has the same basic internals...
 

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Well from the outside, it was the same. All the way. Everything was the same that I could tell. Let me get mine back from LEEs and Ill compare them side by side for a better presentation to you guys.

My initial thoughts were that it was a real high quality piece because it looked so nice and was so similar to the OEM one. I am not a fool and am extremely picky about that stuff, so when I say that, its for real.

My presumption is the inside is just terrible. I could send it to LEE if I wanted to waste the money to find out exactly what was wrong with it/them.

Just rebuild the one ya got is all I have to say, like I said above. I just have a bad feeling about this company to be honest.
 

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I'm thinking one would be better off sending their iron pump to LEE,and that's what I'm about to do. Fluid cools the pump,not the other way around. Anyone's guess what happens to the internals when the aluminum housing gets too hot. My guess is that it seizes up....
 

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It's been discussed before on aftermarket parts not being very good. I would take a good condition used GM pump over ANYTHING aftermarket. Unfortunately, some of the GM (ac Delco) parts have not been getting good reviews either, but would trust them over any other rebuilt brand. I picked up a low mileage unit years ago and put in storage for when the day comes to replace it. I think another issue with these LT1 ps pumps is that on our car they turn in the opposite direction of other lt1s out there which could also lead to issues witha rebuilt unit and getting a part that looks right but internally is completely wrong.
 

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Like I said, if your pump is the original one, have it rebuilt. By who is up to you. DIY it if you find the parts (can you please post up where to find the parts, I know rockauto has the seals but what about other parts??)

The best pumps are the original ones on the car, no doubt. Even if you need to go to a junk yard to get one of unknown condition just to have a core to rebuild is still better than wasting 2 minutes with any of these off brand remans or 'new' ones. I have pondered gathering them from LT1s in JYs just to have originals before they are shredded and never seen again. Good cores will soon be hard to come by for these, so be prepared with these odd parts!
 

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Discussion Starter #11
Bought rebuild kit from AZ.
Used shaft from older style GM pump because the JY one was boogered up.
Same part between two.
Cheap and plentiful in yards, I had one laying in garage from my Jeep that I stole it from.
 

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The reason I asked about what it looks like is that, like all imitations, they likely cast it from an original GM pump.

SlowSS, the principle of a power steering system isnt different than any other hydraulic leverage system; it cools, it lubricates, and it removes/insulates any debris... being aluminum should allow it to cool more effectively via its heat sink properties in normal use... For autocross, I doubt it without a dedicated cooler. Any siezure/failures depend entirely on what they did inside for races/pressed-in wear surfaces/hard parts... otherwise it'd become an aluminum grinder before siezure. Many are made of aluminum these days and even the old style GM pumps are made of aluminum now for their heat & weight-shedding capability.

Id be very interested to see the inside of one... the issue with the DNJ might even be as simple as them designing it to flow the opposite direction of what it should... wouldnt be the first one to sell something designed to fit, yet over-looked the fact these have a reverse-flow cooling system.
 

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Suspect it's make from aluminum because aluminum is far easier/cheaper to cast,and machine. Not because it holds up to heat better,because it doesn't. Saves weight? I suppose,but prefer the proven durability of cast iron... I'll be sending mine to LEE... I fully expect that it will perform better,and run cooler than the aftermarket aluminum pump...
 

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In theory.... The aluminum pump will pull the heat away from the bearings and all that better and faster than the iron one. I like the iron better. Its like a cast iron block, yeah aluminum is great, but you can tweak them in a high performance application if they arent thoroughly warmed up. Basically its more durable and will withstand the heat (which it will get a lot of for a long time given where it is!!) better than the aluminum one. However, i am sure the aluminum would have been fine for a long time, given that it worked. lol

I sent mine to Lees, yall should do the same. If money allows of course cause it aint cheap. If you can DIY, thats the only other real way I can vouch for.
 

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Update minute for this, I will finally be getting my PS pump back from LEEs today, I hope... So Im excited about that and Ill be getting this DNJ boxed up and sent back as soon as saturday comes around.
 

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So I have no doubts something was up with that pump. I put on the rebuilt one, flushed, bled, started it up and it is soooooo damn smooth and quiet now. Cant recommend LEEs enough. (minus the TAT on the unit itself).

Just to note... I did notice that when I put my rebuilt pump on, I just had to press the pulley all the way on. The DNJ had to be centered to the belt...
 

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As if it could get worse... I guess my pump somehow got lost on the way back to the people who sold it to me. So I just pissed away 125 bucks and a good 5 hours on that POS. Furious doesnt describe my feelings quite right..
 
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