The
1991.5 thru 1993 Cummins Diesel/Dodge Ram was a 160 hp engine that is air-to-air
charge air cooled, the compressor housing has a v-band outlet and a 4”
compressor inlet.
These
trucks are equipped stock with a non-wastegated H1C turbo with the standard 70mm
dia (60mm exducer) turbine wheel, a 18cm2 turbine housing, except for the first
approximately 70,000 trucks built with air to air charge air cooling that were
released with 21cm2 turbine housings. These turbochargers all have a 54mm
inducer compressor wheel. Note that there were some 1991 trucks that were not
air to air charge air cooled. These upgrades would not apply to those trucks,
for upgrade information on those trucks see our 1988-1990 turbo upgrade page.
On
these applications most people want a larger compressor wheel and housing (later
years all use larger compressors) and a smaller cm2 turbine housing area (as on
later year trucks) for quicker response and more power (especially those
equipped with the 21cm2 housings, which are probably the most underpowered
trucks the factory released, and those most benefited by a turbine housing
upgrade)
We
have two complete new turbos marked with a * that We highly recommend because
externally it is identical to the stock turbo and requires no modifications to
mount yet upgrades both sides of the turbo for a reasonable price. There is also
a turbo marked with a ** that requires moving the downpipe back but are also a
great match and will do the same. It all comes down to just picking which size
housings you prefer.
This is a partial list, additional upgrades are available. Check our “All Years”
page for additional upgrades available.
|
PRODUCT & DISCRIPTION |
PART # |
|
Complete new stock turbo.
New
stock Holset turbo with 18cm2 turbine housing. |
GDS
T-03 |
|
*Complete “bolt in” up-grade turbo.
This
turbo is equipped with a 56mm inducer comp. wheel and housing with a map width
enhancement slot and a 16cm2 non-wastegated turbine housing. Good value
upgrade!
|
GDS
T-04 |
|
**Complete up-grade turbo.
This
turbo is equipped with a 58mm inducer comp. wheel and a 14cm2 non-wastegated turbine
housing. Requires moving exhaust downpipe back 1.25”. (Add $40.00 for 14cm2
housing that does not require moving downpipe) |
GDS T-05 |
|
*Complete “bolt in” up-grade turbo.
This
turbo is equipped with a 60mm inducer comp. wheel and a 16cm2 non-wastegated turbine
housing. |
GDS
T-06 |
|
56mm inducer Compressor Housing and
Wheel combination. (H1 Stage 1)
New
Holset Comp. Wheel & Housing combination. Adds map width enhancement
slot. |
GDS
CH-03 |
|
58mm inducer Compressor Housing and
Wheel combination. (H1 Stage 1)
New
Holset Comp. Wheel & Housing combination. Adds map width enhancement
slot.
combination. No modifications to mounting connections required |
GDS
CH-04 |
|
60mm inducer Compressor Housing and
Wheel combination. (H1 Stage 2)
New
Holset Comp. Wheel & Housing combination. Adds map width enhancement
slot. |
GDS
CH-05 |
|
16cm2 non-wastegated Turbine Housing.
Bolt
on better performance at all r.p.m.’s. |
GDS
TH-05 |
|
14cm2 non-wastegated Turbine Housing.
Great
performer! Requires moving exhaust downpipe back 1.25”. |
GDS
TH-03 |
|
14cm2 non-wastegated Turbine Housing.
Great
performer! Drop in replacement that does not require moving exhaust downpipe back 1.25”. |
GDS
TH-04 |
|
12cm2 non-wastegated Turbine Housing.
Bolt
on great bottom end. May be a bit restrictive on high h.p. engines but I
have found that it works very well on these early trucks that all have
smaller compressor wheels. |
GDS
TH-01 |
|
14cm2 wastegated Turbine Housing.
Great
all around match. Includes housing, actuator & all brackets. Requires moving
exhaust downpipe back 1.25”. A wastegate pressure sensing hose and manifold
hose fitting will need to be supplied and routed by customer. |
GDS
TH-08 |
|
12cm2 wastegated Turbine Housing.
Great
all around match. Includes housing, actuator & all brackets. Requires moving
exhaust downpipe back 1.25”. A wastegate pressure sensing hose and manifold
hose fitting will need to be supplied and routed by customer. |
GDS
TH-07 |
