Time to Edumacate me once again fellas

See I know the first gens use the h1c turbo with either the stock 18.5 or 20.5 CM housing but other than that I'm somewhat lost. I know that the 2nd gens use the HX35 and that there's an HX40 which I'm assuming is for the 3rd gens but that's about it. Someone put some numbers and figures as to what and when each one was used and so on. How they differ would also help me understand better.

Also are my eyes going bug eyed or is there HY turbos as opposed to HX's? Is so what are these?

Thanks,
Mike

I'm just trying to open myself up to other things than just the 1st gens

 

http://dodgeram.org/tech/dsl/FAQ/turbo_faq.htm

Read that and check back in with any questions that doesn't answer.

 

So if I was to be going to upgrade my first gen what would be the advantages of attaching a HY turbo instead of an HX? It says the HX has a greater control at higher boost but it says an HY is better for the stopping starting motion of an auto tranny. So am I to assume that an HX would be better than an HY for bombing purposes if I was aiming for high boost pressures?

Also what about the HX40's? How much better is one of these puppies compared to an HX35? They also come in the HY as well, right?

Also... the HY comes with the 9cm2 housing? What does it mean when it says 'single ported'?

 

The hy turbos spool quickly but get high EGT's because of their 9cm3 housings. the HX 35 is slower to spool up but doesn't get as hot with the 12cm3 housing. the HX 40 doesn't spool quickly at all but can keep EGTs in check better with a 16cm3(?) housing. the HY turbine and comp wheels are kinda small so they are very limited on the amount of cool boost they can push, the hx 35 has slightly bigger wheels so it is capable of higher boost before it gets too hot, and the hx 40 is bigger yet .I wouldn't put an hy 35 on anything5.9l or bigger. the hx 35 is good until you get heavily fueled. with the hx 40 you need to be heavily fueled to run it and it will smoke until boost finally catches up

 

Unless you are going to stick with stock injectors and most of your driving is in town, the HY-35 is not a good swap. The little tiny exhaust housing that gives instant spoolup causes way too much backpressure. With bigger injectors you would have impossible EGT problems, and you can't put a bigger housing on an HY-35. The backpressure will hurt your highway fuel economy even with stock injectors. Depending on how you use the truck this may not be a problem.

The benefit of an HX-40 is that it can flow more air and exhaust. They are OK up to 400 HP or so, but don't even think about trying to run one unless you are making close to 300 HP. You need a good bit of fuel to spool one. I have not heard of an HY-40.

The HX-40 is not as popular as it used to be, the Schwitzer based turbos (Killer B, HTB2, KwikSpool, etc.) have pretty much taken over the big single market. They are tougher and have reasonable effieciency up to 45 psi, the HX-40's fall off around 35 - 38 psi.

 

So am I to understand that my best bet would be to stick with an HX35 and swap the turbine housing to whatever I desire? Would a 12cm housing on an HX35 be wrong on a 1st gen and would it be best to stick to an HX35 with something like... say... a 16cm housing? You know, the happy medium idea. How much exhaust would be needed to push something of this size?

About the Wastegate... if you're blowing out alot of exhaust... and you close your wastegate for more boost pressure... am I to understand you dont get anymore noticable power? This is what I got from that dodgeram.org site...

 

With stock injectors the 12 cm housing is awesome! If you do mostly highway the 16 cm will give you a tick better fuel economy, but the 12 cm rocks in town.

The wastegate is controlled by boost pressure, If you don't connect the wastegate controller to a source of boost, the wastegate will never open. More boost does not mean more power, in fact it can hurt power. You want enough boost to burn your fuel cleanly and keep EGT in control. More than that is counterproductive.

 

So If I was to stay 'mostly stock' the 12 would be cool... But if I was to go to about 300hp a 16 would be better? Best to prepare for future ideas IMO

A couple more questions too...
1. What does 'single ported' mean on that HY turbo? Something to do with that housing not being innerchangable?
2. If you get too much boost it'll make backpressure which'll cause airflow to flow back towards the turbine? I gather the exhaust would blow apart before the turbine would be effected though, right?
^^^A buddy thought he was being smart(not mentioning any names) and he held his foot on my exhaust pipe... I failed to pay attention and started it... that puff of smoke didn't come out and he was holding on for all he was worth... I think and grin and gave her some pedal. Needless to say it backfired for him(the truck did as well) and he ended up wearing what was building up in there. His blue jeans weren't blue very long. But yes this is a situation that got me thinking. What would blow up first, the exhaust or the turbine?
3. If someone was to run twins, would they do something like... and HX35 into an HX40? Or would that even work?

Sorry for all the questions but I might as well ask everything at once.

 

Too much boost will cause a turbo "Bark" if you let off of the throttle, through the compressor housing/wheel , not the turbine.

it won't do anything to your exhaust , but next time i won't be holdin my foot on there , talk about your jokes gone bad , i had to wash those jeans twice...

 

1. The HY housing has a single passage for exhaust, the HX series housings have two passages.

2. Your question is confusin' me. Would you mind restating that?

If your exhaust is blocked off, the engine will stall before anything blows up, unless you have a weak point like a rusty muffler. Did you get any pics? A video would be priceless!

3. The HX-35 is often used as the top turbo in a set of twins, but an HX-40 is not big enough to be a good bottom turbo. There are a lot of guys running HX-40's on top. A commonly used bottom turbo is the HT3B.

 

I gotta stop you on this one Dave , that engine won't stall , that was my origional thought , but trust me , she keeps spinning , and no videos

I had all of my 195 lbs on that one foot coverin the ehxaust , and it was pushing my foot off of it.

 

Your foot was the weak point.

 

I guess it was, all i can say is there was alot of pressure in there when i couldn't hold my foot on it anymore