ta 44 turbo
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UNDER-PRESSURE
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Are you going to use the stock turbo elbow or aftermarket downpipe? What boost levels do you plan on running?
UNDER-PRESSURE
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You should be fine at moderate boost levels.
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what the heck is a "TA 44" ????
BobbyBuick
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A Ta49 Is A Te44 .never Heard Of A Ta44??
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and i dont get the advice about it being ok for moderate boost
moderate boost (low boost for 91-93octane ) is usually only obtainable with a proper fitting puck to the watgate port
, if the puck is too large compared to the hole (more than 1/8 larger than the hole ) then it could impede the air flow out of the wastegate hole and the result would be poor boost control - higher boost at higher airflow (rpm) , if your goal is high boost (running race fuel or alky inj) leave it alone unless you find you cant maintain the boost level you intend to run without it creeping upat the top end of the gears , if you port it you may find boost will be lower than you want with a std wastegate and then have to go to a HD gate to just get to those higher boost levels, and if you port it and go too far leaving a gap when puck is closed then spoolup will suffer
in your case the houstons pucks are larger than stock but 15/16 is already a little bit larger hole than stock puck would have (stock is 1-1/8") so i wouldnt touch it .
and its either a TA49 or a TE44 , both use the same wheels but the TA49 looks like stock turbo outside , the precision (not percision) is a TE44 and has an integral inlet in the compressor cover and as far as performance the TE44 compressor cover is good for about 20-30 hp over the similar wheeled TA49, the TE44 is commonly equipped with a .82 exhaust housing and the TA49 with the .63 , but there are .63 te44's and .82 TA49's
moderate boost (low boost for 91-93octane ) is usually only obtainable with a proper fitting puck to the watgate port
, if the puck is too large compared to the hole (more than 1/8 larger than the hole ) then it could impede the air flow out of the wastegate hole and the result would be poor boost control - higher boost at higher airflow (rpm) , if your goal is high boost (running race fuel or alky inj) leave it alone unless you find you cant maintain the boost level you intend to run without it creeping upat the top end of the gears , if you port it you may find boost will be lower than you want with a std wastegate and then have to go to a HD gate to just get to those higher boost levels, and if you port it and go too far leaving a gap when puck is closed then spoolup will suffer
in your case the houstons pucks are larger than stock but 15/16 is already a little bit larger hole than stock puck would have (stock is 1-1/8") so i wouldnt touch it .
and its either a TA49 or a TE44 , both use the same wheels but the TA49 looks like stock turbo outside , the precision (not percision) is a TE44 and has an integral inlet in the compressor cover and as far as performance the TE44 compressor cover is good for about 20-30 hp over the similar wheeled TA49, the TE44 is commonly equipped with a .82 exhaust housing and the TA49 with the .63 , but there are .63 te44's and .82 TA49's
UNDER-PRESSURE
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Thanks for clearing that up but isn't that what i said???? He will be OK with a THDP.
Usually they use a "c" suffix after the turbo name which means complete. No c suffix means no actuator.
Smaller than it needs to be
. Its small enough so that the factory puck would seal on it if it had to. Id guess smaller than .900in.
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Being a former PTE Sales Tech for 4 years and 11 months, the hole is supposed to be .900", but sometimes due to castings shifting, it might become smaller. If you look back at other old posts in this forum, I've gone into great detail about PTE part number designations.
There is no such thing as a TA-44 turbo for the '86-'87 Buicks, when talking about PTE turbos.
Just to clarify,
TA means that it uses the stock '86-'87 Garrett compressor cover with a new billet aluminum 2-bolt inlet bell. The compressor cover gets machined to accept the larger compressor wheel.
TE means that it comes with an aftermarket TO4E style integral inlet bell compressor cover. The PTE TE cover has a .60 A/R with a 3" inlet and 2" discharge with no other casted in numbers or letters. They engrave the model number and name of the turbo after assembly onto the discharge of the compressor cover.
The TA-49 and TE44 share the same rotating assembly. (aka both wheels, internals and bearing housing) The only differences are the compressor cover, backing plate, and wastegate actuator bolt pattern/spacing. All of the TA series turbo will accept a stock wastegate actuator. The TE series turbos require a correctly orientated bracket to be welded onto the stock style wastegate actuator in order for it to bolt up properly. With regards to the wastegate hole sizing, what I have found is that on turbos equipped with the T31 Stage 3 turbine wheel (which is the wheel that both the TA-49 and the TE-44 use) the standard hole size will give you perfect boost control whether you are using the stock downpipe or a Terry Houston style pipe. If the hole has been ported out larger than 1.15", it will have sealing issues with the stock cast iron elbow unless you have it modified with a larger puck. (Which I don't recommend) If the hole has been ported out to 1.15", and is in the correct position in relation to the puck location on a Terry Houston style dp, it would work just fine.
The problem is, with all of the different downpipes on the market, puck placement is not always in the exact same spot. Now, if the hole is ported out for a specific downpipe, it is highly recommended to double check the alignment of where the puck falls over the hole, vs just throwing the turbo on and riding. If the hole is larger than 1.25" there is a chance that even a Terry Houston style puck won't seal well. Holes larger than 1.25" are typically done for downpipes that have an external style wastegate that has a 1.5" pipe that feeds the wastegate. It is also highly recommended to port the hole out to at least 1.25" on turbos that are equipped with a P-trim turbine wheel to maintain proper boost control. It is mandatory to port out the hole on GT-Q turbine wheel equipped turbos.
Hope some of this helps.
Patrick
There is no such thing as a TA-44 turbo for the '86-'87 Buicks, when talking about PTE turbos.
Just to clarify,
TA means that it uses the stock '86-'87 Garrett compressor cover with a new billet aluminum 2-bolt inlet bell. The compressor cover gets machined to accept the larger compressor wheel.
TE means that it comes with an aftermarket TO4E style integral inlet bell compressor cover. The PTE TE cover has a .60 A/R with a 3" inlet and 2" discharge with no other casted in numbers or letters. They engrave the model number and name of the turbo after assembly onto the discharge of the compressor cover.
The TA-49 and TE44 share the same rotating assembly. (aka both wheels, internals and bearing housing) The only differences are the compressor cover, backing plate, and wastegate actuator bolt pattern/spacing. All of the TA series turbo will accept a stock wastegate actuator. The TE series turbos require a correctly orientated bracket to be welded onto the stock style wastegate actuator in order for it to bolt up properly. With regards to the wastegate hole sizing, what I have found is that on turbos equipped with the T31 Stage 3 turbine wheel (which is the wheel that both the TA-49 and the TE-44 use) the standard hole size will give you perfect boost control whether you are using the stock downpipe or a Terry Houston style pipe. If the hole has been ported out larger than 1.15", it will have sealing issues with the stock cast iron elbow unless you have it modified with a larger puck. (Which I don't recommend) If the hole has been ported out to 1.15", and is in the correct position in relation to the puck location on a Terry Houston style dp, it would work just fine.
The problem is, with all of the different downpipes on the market, puck placement is not always in the exact same spot. Now, if the hole is ported out for a specific downpipe, it is highly recommended to double check the alignment of where the puck falls over the hole, vs just throwing the turbo on and riding. If the hole is larger than 1.25" there is a chance that even a Terry Houston style puck won't seal well. Holes larger than 1.25" are typically done for downpipes that have an external style wastegate that has a 1.5" pipe that feeds the wastegate. It is also highly recommended to port the hole out to at least 1.25" on turbos that are equipped with a P-trim turbine wheel to maintain proper boost control. It is mandatory to port out the hole on GT-Q turbine wheel equipped turbos.
Hope some of this helps.
Patrick
