Because of an oil leak, i am replacing the stock turbo on my '93 W250. I dont plan on going crazy with performance mods in the future, so should i get a new stock turbo, or is it worth getting an upgraded one? are the second gen turbos the same as mine? found one for a second gen at a great price. any need for a waste gate on a stock truck? a buddy told me i should get a smaller exhaust housing while i am doing the swap. worth it? Thanks

 

worth it I've heard (no personal experience yet). the WH1C found on 94s and the hx35's are an internally wastegated turbo and considered an upgrade over our H1C's, especially if you have the 21cm housing (can't remember if that was a 92 or not). The 12cm housing on the 2 mentioned models will spool much quicker and they will control boost pressure while relieving cylinder pressure with the internal wastegate. Another plus is they can usually be had for $100-$300 in perfectly usable condition. They will bolt on, oil supply and drain go right on as well. I can't remember if the exhaust is the same though, but someone will chime in. It's a very common small upgrade. Make sure to take the small ring out of the inlet of the turbo (with snap ring pliers). It will make that turbo SING!

 

upgrade, an hx35 or he351 would be much better turbo and is a cheap upgrade

 

Which would you prefer, hx35, or he351? any suggestions on where to purchase the turbo and housing?

 

Whats the difference between the HX40 and HX35? would one be better for me than the other? Will a Holset HE351VGT from a 6.7 work?

 

The he351 would probably be a better choice and would spool quicker and it also has a 4" exhaust outlet, Just look on the classifieds and you'll find some, people pull them off the newer trucks all the time to upgrade.

 

YOu want an HE351CW from a 04-07.5 5.9L HO engine. It's wastegated instead of variable vane like the HE351VE from the 6.7L's. The variable vane can be used with very desirable affects, but major tuning and controller modifications are an order. HX35 will be almost bolt on, and they have a 12cm^2 exhaust housing. HX40's are real nice, but I think there are SEVERAL types made over the years and I don't know which is which.

I've read the HE351 (cw and ve) have a compressor very similar or the same as the HX40 (which is the best part about the HX40). They have much faster spool up time though with the small 9cm^2 housing. However, they are NOT as restrictive as the HY35 from the 2001-2002 24 valve 5.9L's equipped with automatics. They however will not be too restrictive in a 300 hp truck or less, especially with our VE injection pumps. The VE's make their grunt down lower than the higher spinning P7100's, therefore the smaller exhaust housings of the Hy35 (an sort of with the HE351cw) don't choke out engines off with high back pressure AS MUCH.

Hope any of that helps.

 

the he351 comp wheel and the super 40 comp wheel are the same wheel. The real difference between the 2 turbos is in the exhaust side afaik

 

Thanks guys, it sounds like i want a HE351CW from a 04-07.5 5.9L HO engine. this has been a big help. When installing the HE351CW, will it pretty much bolt up, or are there any mods i need to know about?

 

if you don't plan on making more than 350 hp no need to swap turbos. Add a 60mm wheel and housing from GDS to your h1c and it will suit your needs just fine.

 

The he351 is a fantastic upgrade but it's definitely not bolt on. There is quite a bit of little tinkering that has to be done to get it on your truck but once you do I'm sure you'd be happy. You will also need to do something about your intercooler pipe that goes from the turbo to the intercooler. And you'll also need a 4" down pipe with the right flange welded on it.

I've heard if you're anywhere near 300+hp things are pretty toasty with the GDS wheel though?

 

i don't have problems and i am close to 400hp. Street driving is just fine and when i haul anything i turn down the timing and put the truck in valet mode. If the truck is going to work for a living then yea it might be a pain but as long as you watch the pryo you are just fine.

 

The HE351 needs a few items addressed, so it's not quite a bolt on like the HX35 will be. You'll need a 4" downpipe (which is always good anyway) with a flat faced flange (sort of like a large washer on the end of the pipe). 2 studs are threaded into the exhaust flange on the HE351 that will have to be removed and drilled out so you can put it on our manifold. I did it with a Ryobi cordless drill, no big deal.

2 decisions from here:

A.) You'll have to take the exhaust housing off (snap ring and some soaking in PB Blaster in my case) and remove 2 slit pins used for alignment so it hooks up to the DP of the original truck. Now you can rotate it however you want, BUT the mount for the wastegate is on the compressor housing. As you clock the turbo, now the wastegate can't be mounted. I will be making a bracket off the original aluminum one on the compressor so he wastegate can be mounted .

B.) Don't clock the turbo but the compressor outlet will be on top (like in PapeCAT's thread, he has a good picture). NOw you will have to do a different intercooler pipe set up so it will reach. I believe The Head (John) had his HE341 or his newer HE351 set up like this for awhile.

Hx35 will be simpler if that is what you're after. But the He351 I'm told is a blast. Can't wait to get mine back on the road.

 

Dzl Damon - Thanks man that made alot of sense. doesn't sound too bad. I can handle that. I think i am gonna go with the HE351. What should i use for my new IC pipe?

 

steel would be easiest since it's cheap, easy to weld, and easily available. Make it look good when your done by just painting it with high temp engine paint.