Buying a T34 Turbo-Which exhaust housing is best?
28-09-2005, 07:57 PM
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Buying a T34 Turbo-Which exhaust housing is best?
Morning guys,
I'm looking at buying a Garrett T34 turbo for my 1988 Sapphire.
I hear there's some good hybrid mods that can improve your turbo like a 360 degree thrust bearing and various other things. Could someone please explain some good mods to do to your turbo to reduce lag and make it perform better.
I've also heard lots of things about the different exhaust housings and thus I'm a little confused about which one I should get.
I hear the .48 housing is the most common, then there is a .63 and another size which I can't remember. Can anyone tell me what size housing is best suited to my Stage 2-3 Sapphire, or even better eplain the applications or difference in horsepower that the different exhaust housings will give me.
I have the following mods.. Bosch Green 803 injectors, Bailey Breather Kit, Bailey Swirl Pot, Pace RS500 Spec intercooler, 3 Bar Map Sensor,-31 Actuator, K&N Panel Filter, Mongoose 3" Exhaust system and a few other cosmetic additions.
Thanks in advance
I'm looking at buying a Garrett T34 turbo for my 1988 Sapphire.
I hear there's some good hybrid mods that can improve your turbo like a 360 degree thrust bearing and various other things. Could someone please explain some good mods to do to your turbo to reduce lag and make it perform better.
I've also heard lots of things about the different exhaust housings and thus I'm a little confused about which one I should get.
I hear the .48 housing is the most common, then there is a .63 and another size which I can't remember. Can anyone tell me what size housing is best suited to my Stage 2-3 Sapphire, or even better eplain the applications or difference in horsepower that the different exhaust housings will give me.
I have the following mods.. Bosch Green 803 injectors, Bailey Breather Kit, Bailey Swirl Pot, Pace RS500 Spec intercooler, 3 Bar Map Sensor,-31 Actuator, K&N Panel Filter, Mongoose 3" Exhaust system and a few other cosmetic additions.
Thanks in advance
29-09-2005, 09:10 AM
#3
PassionFord Post Troll
0.48 ex.housing give less lag....but limits the power output around 370bhp...
0.63 ex.housing give little more lag (300rpm)...for more top end power...
there is also a 0.55 ex.housing which sits between those.....
but 360 bearings is a good thing to do....
0.63 ex.housing give little more lag (300rpm)...for more top end power...
there is also a 0.55 ex.housing which sits between those.....
but 360 bearings is a good thing to do....
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29-09-2005, 02:13 PM
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Originally Posted by snow*
Hmmm decisions decisions, so what housing will make my Sapphire quicker off the mark?.
Say the 0-100kph range?.
Say the 0-100kph range?.
29-09-2005, 07:48 PM
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Thanks for the replys so far lads.
A few more questions seems you're all so helpfull
So a .48 housing is good for low in the rev range power, but isnt good for more than 370Hp, but is good for beating the jappas off at the lights?
A .55 housing has good mid rev-range power?
And a .63 has high rev range power, or does it only give you an increase in "top speed"?.
With my setup ( which I list in my first post here) if I did get a T34 what is a rough estimate of how much power I will have, will it be more than 370Hp thus making a .48 housing a waste of time with my current mods?
Also as I'm reletively new to the whole Cosworth scene can someone explain how you launch succesfully and what is invovled with revs, where your feet are placed on the pedals etc, Im sure launching is real bad for your car though right?.
Thanks again guys, you're all a world of knowledge
A few more questions seems you're all so helpfull
So a .48 housing is good for low in the rev range power, but isnt good for more than 370Hp, but is good for beating the jappas off at the lights?
A .55 housing has good mid rev-range power?
And a .63 has high rev range power, or does it only give you an increase in "top speed"?.
With my setup ( which I list in my first post here) if I did get a T34 what is a rough estimate of how much power I will have, will it be more than 370Hp thus making a .48 housing a waste of time with my current mods?
Also as I'm reletively new to the whole Cosworth scene can someone explain how you launch succesfully and what is invovled with revs, where your feet are placed on the pedals etc, Im sure launching is real bad for your car though right?.
Thanks again guys, you're all a world of knowledge
30-09-2005, 08:56 AM
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People will describe launching in different ways. Personally I wouldn't side-step my clutch 'cos I'm in a 4x4 with standard transmission, so I slip the clutch and call it "launching" 
02-10-2005, 12:02 PM
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360 degree bearing is definetly worth while, standard bearings will only cover 300 degrees, in other words its not a complete bearing around the main shaft.
having a .63 housing wont immediatly give you the extra power that makes you have 370bhp. your power output will prob be the same with whatever exhaust housing you decide to go for, it will just change the way the car drives and comes on boost.
going for the .48 will as already posted spool up a bit quicker and dependant on future mods will probably limit you to the region of 370bhp.... but to go with a .63 housing and with future mods you may see a fair bit more... maybe towards 390+bhp.
.48 - better spool up and a more punchy feel.
.63 - mildly laggier, but can deliver more boost higher up the rev range.
Hope that helps
Kelvin
having a .63 housing wont immediatly give you the extra power that makes you have 370bhp. your power output will prob be the same with whatever exhaust housing you decide to go for, it will just change the way the car drives and comes on boost.
going for the .48 will as already posted spool up a bit quicker and dependant on future mods will probably limit you to the region of 370bhp.... but to go with a .63 housing and with future mods you may see a fair bit more... maybe towards 390+bhp.
.48 - better spool up and a more punchy feel.
.63 - mildly laggier, but can deliver more boost higher up the rev range.
Hope that helps
Kelvin
04-10-2005, 12:15 PM
#13
Whats so wrong with lag ?
Dont you love it when your turbo is lagging, and spooling and you hear it spool up and think "weeeee here we go" then it pushes you into the back of your seat, hard ?
Dont you love it when your turbo is lagging, and spooling and you hear it spool up and think "weeeee here we go" then it pushes you into the back of your seat, hard ?
04-10-2005, 05:01 PM
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Originally Posted by Porsche911r101
Whats so wrong with lag ?
Dont you love it when your turbo is lagging, and spooling and you hear it spool up and think "weeeee here we go" then it pushes you into the back of your seat, hard ?
Dont you love it when your turbo is lagging, and spooling and you hear it spool up and think "weeeee here we go" then it pushes you into the back of your seat, hard ?
07-10-2005, 12:18 PM
#17
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Great thread!
I'm also new, but just like to learn more about these things, when talking to some m8's who totally lose me!!!! I'm a Mechnical Design Engineer so want to know the science behind these things too.
Look at these links for examples of how COOL lag really is!
Its on a Jap turbo converted H-o-n-d-a A-c-c-o-r-d Type R.
http://www.mobisux.com/album/data/500/7524MOV00225.MPG
http://www.mobisux.com/album/data/50...atrsemafor.MPG
http://www.mobisux.com/album/data/50...brakeboost.MPG
http://www.mobisux.com/album/data/50...atr100-250.MPG
http://www.mobisux.com/album/data/500/7524atrflyby.MPG
I'm also new, but just like to learn more about these things, when talking to some m8's who totally lose me!!!! I'm a Mechnical Design Engineer so want to know the science behind these things too.
Look at these links for examples of how COOL lag really is!
Its on a Jap turbo converted H-o-n-d-a A-c-c-o-r-d Type R.
http://www.mobisux.com/album/data/500/7524MOV00225.MPG
http://www.mobisux.com/album/data/50...atrsemafor.MPG
http://www.mobisux.com/album/data/50...brakeboost.MPG
http://www.mobisux.com/album/data/50...atr100-250.MPG
http://www.mobisux.com/album/data/500/7524atrflyby.MPG
15-10-2005, 10:15 PM
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*Sorry to bring this thread back to life guys*
Just wanted your opinions on this, which I was reading on some forums over here in New Zealand with regards to buying a T34 Turbo and which exhaust housing would suit me best for my 2WD Sapphire
Remembering I have the folling mods.....
Bosch Green 803 injectors, Bailey Breather Kit, Bailey Swirl Pot, Pace RS500 Spec intercooler, 3 Bar Map Sensor,-31 Actuator, K&N Panel Filter, Mongoose 3" Exhaust system and a few other cosmetic additions.
What do you guys reckon I should do?
Just wanted your opinions on this, which I was reading on some forums over here in New Zealand with regards to buying a T34 Turbo and which exhaust housing would suit me best for my 2WD Sapphire
Remembering I have the folling mods.....
Bosch Green 803 injectors, Bailey Breather Kit, Bailey Swirl Pot, Pace RS500 Spec intercooler, 3 Bar Map Sensor,-31 Actuator, K&N Panel Filter, Mongoose 3" Exhaust system and a few other cosmetic additions.
The T35 (Escort Cos) and T3 (Saff 4x4) turbos are very similar to each other, both use the same centre section, and turbine wheel/shaft. The differences are the Sierra uses a smaller compressor wheel and housing, and a .48 exhaust housing where the Escort has the bigger compressor and uses a .63 turbine housing. The Sierra turbo starts making good boost at about 2700rpm, the Escort (T35) needs about 3500 to really start puffing. I personally wouldn't use the bigger turbo unless you are ALREADY making 350hp, the bigger unit will make the car feel slower on anything other than a reasonably tuned engine. I would say my old 4x4 Saff on 15 pounds boost was at least as quick in acceleration as my Escort on 20pounds, if not faster. As an option, if you have a good Sierra Turbo that has already had a 360 thrust fitted, you can retro-fit a t35 compressor wheel and housing, and a .63 exhaust housing. I have a new .63 exhaust housing which I am happy to sell, and I might have a compressor as well, will have to check though.cheers conrad
Just reading what you have done to your car, as the engine is still basically standard, and runnng 18 pounds you are probably making about 280hp. All other things being equal,going to a T34 at this stage will make the car FEEL slower, it will feel nowhere as responsive as the T3. You will make a bit more power at the top end, but lose it everywhere else. I would hold off the bigger turbo until you have done some mods to the engine, get the one you have rebuilt with a 360 thrust bearing and it will do the job nicely.
16-10-2005, 04:15 PM
#20
PassionFord Post Troll
Originally Posted by snow*
*Sorry to bring this thread back to life guys*
Just wanted your opinions on this, which I was reading on some forums over here in New Zealand with regards to buying a T34 Turbo and which exhaust housing would suit me best for my 2WD Sapphire
Remembering I have the folling mods.....
Bosch Green 803 injectors, Bailey Breather Kit, Bailey Swirl Pot, Pace RS500 Spec intercooler, 3 Bar Map Sensor,-31 Actuator, K&N Panel Filter, Mongoose 3" Exhaust system and a few other cosmetic additions.
What do you guys reckon I should do?
Just wanted your opinions on this, which I was reading on some forums over here in New Zealand with regards to buying a T34 Turbo and which exhaust housing would suit me best for my 2WD Sapphire
Remembering I have the folling mods.....
Bosch Green 803 injectors, Bailey Breather Kit, Bailey Swirl Pot, Pace RS500 Spec intercooler, 3 Bar Map Sensor,-31 Actuator, K&N Panel Filter, Mongoose 3" Exhaust system and a few other cosmetic additions.
The T35 (Escort Cos) and T3 (Saff 4x4) turbos are very similar to each other, both use the same centre section, and turbine wheel/shaft. The differences are the Sierra uses a smaller compressor wheel and housing, and a .48 exhaust housing where the Escort has the bigger compressor and uses a .63 turbine housing. The Sierra turbo starts making good boost at about 2700rpm, the Escort (T35) needs about 3500 to really start puffing. I personally wouldn't use the bigger turbo unless you are ALREADY making 350hp, the bigger unit will make the car feel slower on anything other than a reasonably tuned engine. I would say my old 4x4 Saff on 15 pounds boost was at least as quick in acceleration as my Escort on 20pounds, if not faster. As an option, if you have a good Sierra Turbo that has already had a 360 thrust fitted, you can retro-fit a t35 compressor wheel and housing, and a .63 exhaust housing. I have a new .63 exhaust housing which I am happy to sell, and I might have a compressor as well, will have to check though.cheers conrad
Just reading what you have done to your car, as the engine is still basically standard, and runnng 18 pounds you are probably making about 280hp. All other things being equal,going to a T34 at this stage will make the car FEEL slower, it will feel nowhere as responsive as the T3. You will make a bit more power at the top end, but lose it everywhere else. I would hold off the bigger turbo until you have done some mods to the engine, get the one you have rebuilt with a 360 thrust bearing and it will do the job nicely.
but a t3 with 18pounds boost against a t34 with 20 pounds boost is not faster...my t34 on my 4wd saph with the 4wd manifold makes boost around 3300rpm with a 0.63 ex housing....and it goed till 6700rpm...a t3 goes around 5500rpm...so which is faster you think...
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16-10-2005, 06:46 PM
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Thanks for your informative reply wimwerf.
A good explanation to back up your advice
I think I'll go for a T34 with a .48 housing and maybe get a 360 degree thrust bearing also.
What kind of rough power figure can I expect from my car if I get this T34 with what mods I already have?.
Cheers Ollie.
A good explanation to back up your advice
I think I'll go for a T34 with a .48 housing and maybe get a 360 degree thrust bearing also.
What kind of rough power figure can I expect from my car if I get this T34 with what mods I already have?.
Cheers Ollie.
16-10-2005, 09:23 PM
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my car with the same spec apart from mine has .63 housing is estimated at 350bhp @25psi .
the downside is the time it takes before making boost, but once it does fooook me does it pull
my mate has a 4x4 with same spec as you with the .48 i think and to be fair his drives a bit nicer than mine cos it makes boost earlier, but it gives less of a kick
the downside is the time it takes before making boost, but once it does fooook me does it pull
my mate has a 4x4 with same spec as you with the .48 i think and to be fair his drives a bit nicer than mine cos it makes boost earlier, but it gives less of a kick
17-10-2005, 06:01 AM
#23
PassionFord Post Troll
Originally Posted by snow*
Thanks for your informative reply wimwerf.
A good explanation to back up your advice
I think I'll go for a T34 with a .48 housing and maybe get a 360 degree thrust bearing also.
What kind of rough power figure can I expect from my car if I get this T34 with what mods I already have?.
Cheers Ollie.
A good explanation to back up your advice
I think I'll go for a T34 with a .48 housing and maybe get a 360 degree thrust bearing also.
What kind of rough power figure can I expect from my car if I get this T34 with what mods I already have?.
Cheers Ollie.
if you go for stage 3 set up...with t34...you are around the 340-360bhp...it depends on how fresh your engine is...and how it is mapped...
17-10-2005, 08:08 AM
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Originally Posted by wimwerf
not maybe 360 bearings...you need them...
if you go for stage 3 set up...with t34...you are around the 340-360bhp...it depends on how fresh your engine is...and how it is mapped...
. Are there any other helpfull modifications that can be done to a T34 with a .48 housing to help it spool up quicker or just make it perform a little better?.I've not long owned the 803's so going to a .63 housing and the light blues is probably out of my price range at the moment unless you really reccomend it mate.Would I need to do some other modifications if I was going to go to the light blue injectors, ie. fuel pump etc etc?
Also mate, what kind of boost will my car be able to handle when I get my T34 Turbo with .48 housing?. I dont want to run it too high and risk damaging my engine.The internals of my engine are totally standard and the car has travelled 79,000 Miles form new.
One last question whilst I'm at it
Will my -31 actuator be sufficient or will it be better for me to go to a -34 actuator when I buy my T34?.
Thanks again fellas, you're all a world of knowledge
17-10-2005, 10:59 AM
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i have a .63 housing aswell as greens and the setup is fine, i think he's trying to say that to get the most out of it then larger injectors+more boost will make more power (370+ ) whereas the .48 would not be as effective for this much power.
i run 25 psi which Stu said will be fine for reliability, provided the correct uprated head gasket is fitted.
Also go for the -34 if you intend to run proper stage 3 boost levels, it is more suited and it comes in with a bang
for you i would recommend the .48 with greens, -34 and around 26 psi.
i run 25 psi which Stu said will be fine for reliability, provided the correct uprated head gasket is fitted.
Also go for the -34 if you intend to run proper stage 3 boost levels, it is more suited and it comes in with a bang
for you i would recommend the .48 with greens, -34 and around 26 psi.
17-10-2005, 11:31 AM
#26
PassionFord Post Troll
Originally Posted by bud-weis
i have a .63 housing aswell as greens and the setup is fine, i think he's trying to say that to get the most out of it then larger injectors+more boost will make more power (370+ ) whereas the .48 would not be as effective for this much power.
i run 25 psi which Stu said will be fine for reliability, provided the correct uprated head gasket is fitted.
Also go for the -34 if you intend to run proper stage 3 boost levels, it is more suited and it comes in with a bang
for you i would recommend the .48 with greens, -34 and around 26 psi.
i run 25 psi which Stu said will be fine for reliability, provided the correct uprated head gasket is fitted.
Also go for the -34 if you intend to run proper stage 3 boost levels, it is more suited and it comes in with a bang
for you i would recommend the .48 with greens, -34 and around 26 psi.
do you have a steel headgasket...if not..BUY one....
17-10-2005, 06:11 PM
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Morning again fellas, nice day over here in sunny New Zealand
Yes I have a Group A head gasket, so 26 psi should be ok then guys?.
I have a stage 3 ahmed bayjoo chip also and Im running Motorcraft 071 plugs, gapped to 0.7mm
Yes I have a Group A head gasket, so 26 psi should be ok then guys?.
I have a stage 3 ahmed bayjoo chip also and Im running Motorcraft 071 plugs, gapped to 0.7mm
17-10-2005, 09:05 PM
#30
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Originally Posted by snow*
Morning again fellas, nice day over here in sunny New Zealand
Yes I have a Group A head gasket, so 26 psi should be ok then guys?.
I have a stage 3 ahmed bayjoo chip also and Im running Motorcraft 071 plugs, gapped to 0.7mm
Yes I have a Group A head gasket, so 26 psi should be ok then guys?.
I have a stage 3 ahmed bayjoo chip also and Im running Motorcraft 071 plugs, gapped to 0.7mm
do you have a pic of your engine bay...
17-10-2005, 09:45 PM
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Originally Posted by wimwerf
maybe a better idea to go for a metal gasket...its more reliable in the long run...
do you have a pic of your engine bay...
do you have a pic of your engine bay...
...So as for a metal head gasket, do you mean a Cometic Multilayer Steel Head Gasket mate?
I've got a Bailey Power Steering Tank, a new Genuine Ford Turbo Heatshield and a new Silver Bailey DV-30 Dump Valve still to put on
18-10-2005, 02:20 PM
#32
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yummy..looking good... 
yep i mean the cometic gasket...or do you want to spent more money for the 4 layer gasket from mountune...thats 380pounds...
ive sent you a PM...
yep i mean the cometic gasket...or do you want to spent more money for the 4 layer gasket from mountune...thats 380pounds...
ive sent you a PM...
10-10-2011, 02:54 PM
#33
Im having 4x4 Cossie with T3 running 1.3 bar peak boost pressure, green injectors etc. Im not sure whether I have stock clutch and head gasket, they could be original since I would only have about 300 bhp at the moment? Is there a point in upgrading into Escort Cosworth T34 (.63 A/R?) turbo? How much more power it would give with same 1.3 bar peak and what are the chances for my drive train to handle the extra bhp? Would it just be better to up the boost with standard T3, or is it on the limits already?
Im relatively new to turbo technology so any help is appriciated.
Im relatively new to turbo technology so any help is appriciated.
Last edited by Cossie92; 10-10-2011 at 03:50 PM.
13-10-2011, 02:49 AM
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Im having 4x4 Cossie with T3 running 1.3 bar peak boost pressure, green injectors etc. Im not sure whether I have stock clutch and head gasket, they could be original since I would only have about 300 bhp at the moment? Is there a point in upgrading into Escort Cosworth T34 (.63 A/R?) turbo? How much more power it would give with same 1.3 bar peak and what are the chances for my drive train to handle the extra bhp? Would it just be better to up the boost with standard T3, or is it on the limits already?
Im relatively new to turbo technology so any help is appriciated.
Im relatively new to turbo technology so any help is appriciated.
18-05-2016, 05:22 PM
#38
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If 4 I would use the ap clutch cover, have a look on Reyland site as he does some packages and do the hydraulic clutch conversion at the same time.
20-05-2016, 04:03 PM
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