Direct V-Band now available even on the T31 exhaust housing.
A large diameter downpipe in a tightly packed engine bay can prove to be a
real installation obstacle, especially when utilizing a turbo equipped with a
T31 exhaust housing. Unlike the newer "GT" 4 bolt exhaust housing
with the conically tapered discharge in a 3" ID opening, the T31 exhaust housing
utilizes a short discharge path and a flange that has a scaled down version of
the 4 bolt
pattern with a 2.5" ID opening. The bolt spacing itself is also 2.5" side to
side, center to center.
The T31 exhaust housing can be found on many older T series, T3, and T3/T4
turbos. It can also be found on some aftermarket versions of the GT turbo
assembly, whereby the GT turbo has been assembled into the older T31 exhaust
housing, in order to complete a turbo unit.
Due to the space contraint caused by this scaled down T31 flange, excessive
notching of the tube is required when welding a 3" downpipe onto this
flange. As a result, installing and removing the bolts on this flange in
this area can also be a challenge due to the lack of clearance and access.
We now have a solution to completely eliminate this "hard-to-acess" 4 bolt
exhaust joint. We have now set up a process to machine the 4 "ears" off
the existing T31 housing and in that process, carve the appropriate V-band flange
directly onto the housing itself. Therefore, we are able to completely
eliminating the need to use a mating 4 bolt flange, and more importantly no longer
needing the 4 nuts and bolts! The mating V-band flange can be used along with
a 1 bolt v-band clamp as shown below. No gasket is required as it seals perfectly
with no chance of nuts and bolts coming loose.
We have used this Direct V-band machining process on the GT version of the 4
bolt housing for well over a year now with great success.
The direct V-band option on the T31 housing will be offered in several
1. When ordering a new turbo from us that happens to use a T31 exhaust
housing, the customer can elect to add a T31VB-250 add-on.
consists of 1) The housing on the ordered turbo to be machined to V-band, 2)
A mating flange for the downpipe side, 3) the V-band Clamp used to join the
flange and the housing. P/N for the T31VB-250 addon is: ATP-FLS-074 which
can be added to any turbo order that has an applicable turbocharger.
2. On GT turbos that is currently offered with the T31 housing, there is now
an option to select the T31VB-250 housing type. Cost will be the same as
the standard T31 housing. Note: This only applies to T31 and not
the GT4 bolt housings where there is always a service charge to modify the already
fully machined GT 4 bolt housings.
3. We may allow a direct swapout of a housing for the cost of the ATP-FLS-074 if
your housing is 100% new unused and we happen to have the same housing on hand
and in stock. Request in advance for availability.