Sorry if this has been covered, but all the talk of turbos has gotten me curious. Could someone go over which turbo's came on which trucks. It seems like automatics and standards are different as well as different housings on different year models. Just kinda curious and wondering what are the ups and downs of each turbo. Thanks.

 

I will try..... 89 to 91.5 == baby H1C with 18.5 housing and 50 mm wheel, 91.5 to end of 92 = H1C with 21 exaust housing and 56 mm wheel, And 93 = H1C with 56mm commpressor wheel and 18.5 housing. I hope Im right.

 

The diffrent turbos for autos and sticks where on later 2nd gen. One was hy35 for autos and one was hx35 for standards. Or vise versa.

 

1989-1991 Non intercooled had a H1C Holset turbo known as the baby H1C with a 50mm wheel known as a baby H1c with a 18.5 cm housing

1991.5-1992 Intercooled had the bigger 56mm compressor wheel H1C turbo with with a bigger inlet from the air box (non intercooled and intercooled hose are different) with the 21cm lagmaster housing for emissions

1993- H1C 56mm compressor wheel,they went back to the 18.5 cm housing on the same Holset H1C turbo. Because of complaints of spool up and loss of power

1994- These trucks are equipped stock with a wastegated WH1C turbo (wastegated 1st gen turbo) with the standard 70mm dia (60mm exducer) turbine wheel, a 12cm wastegated turbine housing and a 56mm inducer compressor wheel.

1995-1998 12 valves i know have the HX35 HOlset turbo with the 12cm housing. this turbo is a great upgrade for a 1st gen

1998.5-2002 24 valves. i think some of them used the hx35 12 cm and stick shift trucks used holset HY9 turbo with a 10 cm housing i think. someone will correct me if im wrong. hahaha

3rd gen trucks use a HX35 with a 9cm housing. i dont know if theres a difference between manual and auto trucks. i will be corrected if i'm wrong.

i didnt copy and paste it off a site becasue i couldnt find one that would tell ya!

 

well i was writin my post while richie o was...soo i dont think im right on the second gen stuff. but i thought a 91.5 intercooled used the intercooled 56mm turbo with the 21cm for sure. and the 1992, some were equipped with 18.5 cm or 21cm. depends what they had layin around i guess. i dont really know though.

 

I think you are right..

 

So how can you tell the difference in the turbos. I have a 92 w350 and it doesn't seem to be very responsive. The truck runs great otherwise, I suspect it has the 21 cm housing.

 

Yes, your truck is a 92 so it has the 21cm "lagmaster" exhaust housing. no matter how much fuel you add the truck will be a slug. dump the 21 and buy a 16cm or 14cm or 12cm from PDR and it will be a totally different truck. .....also a hx35 second gen turbo with the stock 12cm hx35 housing , would be a a sweeet upgrade becasue your truck is stick ..Brandon

 

what trucks could I get an hx 35 12cm off of. Is that the best thing for my truck considering that it is a daily driver and we farm so it tows fairly frequently. My roommate has a 99 auto 3500 he swapped engines in. I think I heard it should be an hy35 turbo on that truck, what it the difference?

 

From what I read, keep the H1C and just slap a different housing on it. The difference between a HX and a H1 is the housing....

Do not buy the 14cm housing. Ask Dave (wannadiesel)

The 21cm was used for insurance reasons I was told. Slow spool=less low end grunt= less warranty claims on the tranny. Emmissions? I dont think so otherwise they wouldn't have switched back to the 18.5cm in 93 and then the 12cm in 94.

 

How to interpret the data?

smaller exhaust housing equals more lag and lower EGT?
Does the smaller housing = quicker boost but limit (choke itself)?

 

From what ive read the hx35 increases boost levels and lower egt's. but thats just my $0.02. the hx35 is found on 1995 to 1998 12 valves and some 24 valves. not that hard to find. will run ya about $300 or so. look on craigslist and ebay.

 

the bigger the housing is...then the lower the egt and the doggier the truck is meaning slow spool up. it does not choke itself. the engine is being provided more air alot quicker meaning less bottom end smoke like from a dead stop and more burnt fuel because the air is getting into the intake faster.. and if the boost is there for the engine to use..then it will use it and get better fuel mileage . it will not choke itself. hope this makes sense

 

I read on a site that it was becasue of emissions, but then there was complaints of power with the 21cm so cummins or dodge whomever, said screw emissions, because with the 18.5 the emissions were good enough but they just wanted to get the EPA more happy by lowering emissions. however, doing so, people who bought the trucks got mad because of how slow they were with the 21. And the 12 was probably used in 94 because of the different fuel tuning with the p7100 and bigger injectors than a 1st gen intercooled. so they put a 12cm housing on it to keep good fuel mileage i guess becasue of the added fuel of the p7100.

 

my 91 had a strait 18cm on it not an 18.5 just to let you know