tennplowboy

I bought a 93 w250 5 speed ctd 120,000. My question is would a 16cm housing help with turbo lag. If you keep rpms up it runs great but it just seems with my 21 cm it takes for ever to get the turbo to spool up. I have a 2001 six speed ho ctd it might just were I drive it . I know there is alot of difference in 245 & 160 hp but I think that my 93 could pull a little better in the mnts. I dont want a ground pounder I would like just a little more hp. What is your guys thoughts on the 16cm and maybe a little more fuel. This is a great site. Thanks for any help.

Bosshawg600

Buy the 16cm. It is a night and day difference. The 21 just lets out too much air which causes they turbo to lag, with the 16 it will spool much faster.

rebal

the 16 will help with lag but if you turn the pump up you might have EGT issues if you want a big diff. put an hx35w like your 01 on it you can find them on ebay and they work real good

wannadiesel

What Rebal said, get an HX-35 off a 2nd gen. Do a little tweaking on the fuel screw at the same time and it'll pull as good as the H.O.

tennplowboy

how many turns of the fuel screw would you say. will the HX-35 bolt on with no mods. Like I said I dont expect it to pull like my 01 but I would like just a little git more up an go. Thanks

G1625S

Once you get a pyro, you can crank the fuel quite a bit. I adjust in 1/3-turn increments. The downpipe will have to be shoved back about an inch and a half if you want to run the 12cmw/g housing. If you use the 21 or a 16 it'll bolt right up.

tennplowboy

today I found a good used hx-35 turbo and I looked at the casting numbers on my 93 it has a 18cm housing. Would the best thing be use the hx35 and my old 18cm housing.
I ordered a pryo yesterday so when I get my turbo worked out I can start on the fuel screw. Or should I keep what I got and just work on the fuel? Sorry for all the questions. Thanks

rebal

no make the hx35 work you will love it

Bushy

Unless someone has already changed the housing the 93's came with an 18.5cm housing.
If that's the case you'll find some improvement in the spoolup but it won't be as big an improvement as going from the 21 down to the 16cm.

As mentioned you can tweak your settings and so forth to improve spoolup a bit more so you'll find the 16 is most versatile housing out there......

bob....

tennplowboy

ok I think I will go with the Hx-35 I read somewhere on that the w.g on the hx35 might make the truck surge at low end rpm on the 5 speed is this correct if so do I need to block it off the waste gate that is. My 93 has a 18.5 cm sorry about that.

G1625S

You won't have any surging problems with the HX35. Folks run into trouble when putting just the 12cm wastegated housing on their stock H1C turbo. The compressor side of your factory H1C is not machined to deal with all the extra boost that a modded truck with a 5-speed can/will produce at lower rpms. The compressor side of your new HX35 has what are called 'map-width-enhancement-slots'. They can be found behind the sliencer ring in the inlet of the turbo. Basically, they allow the extra boost that your 5-speed will build when you whack the loud pedal at 1400 rpms to bleed back through to the inlet of the turbo, rather than backing up in the intake piping. In short, you're good to go with the HX35 and whatever housing you put behind it!

tennplowboy

Thanks guys I might put it on this weekend If I get time I will let you know how it turns out.

fearthedeere

I gotta question bout the hx 35 is it better than my HHT stage 3?

wannadiesel

No. Even the best stock HX-35 is only as good as HTT's "Stage II".

rebal

I think so but thats just my .02