Turbo failure questions!
17-07-2007, 08:20 PM
#1
Turbo failure questions!
My T34.48 failed on session 2 at castle coombe a few weeks back,
i got the car home and havent touched it untill today
i knew the axail bearings had failed and the compressor wheel had touched the housing causing a bit of a mess
but i stripped it down today and found the exhaust housing has cracked in 6 places
three cracks run straight through the wastegate port
the axial bearings have about 2mm of movement in them, which made the turbo stop working, but what would have made the housing crack like that? the engine is still A1, plugs are fine, nothing has melted but the EGT must have been well too hot to cause this?
any opinions?
it was peaking at 32psi holding about 28,
i dont want this to happen to my new maram shafted T34!
i got the car home and havent touched it untill today
i knew the axail bearings had failed and the compressor wheel had touched the housing causing a bit of a mess
but i stripped it down today and found the exhaust housing has cracked in 6 places
three cracks run straight through the wastegate port the axial bearings have about 2mm of movement in them, which made the turbo stop working, but what would have made the housing crack like that? the engine is still A1, plugs are fine, nothing has melted but the EGT must have been well too hot to cause this?
any opinions?
it was peaking at 32psi holding about 28,
i dont want this to happen to my new maram shafted T34!
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17-07-2007, 09:29 PM
#9
they make the peak boost at a higher rpm, which increases the power ,380 is almost impossible with a .48, but 420 is possible with a .63
instead of the peak being at say 4000 rpm ,it would be at 6000
hence you get a bit more lag with a .63
instead of the peak being at say 4000 rpm ,it would be at 6000
hence you get a bit more lag with a .63
17-07-2007, 09:34 PM
#12
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Originally Posted by JTECHSAFF
they make the peak boost at a higher rpm, which increases the power ,380 is almost impossible with a .48, but 420 is possible with a .63
instead of the peak being at say 4000 rpm ,it would be at 6000
hence you get a bit more lag with a .63
instead of the peak being at say 4000 rpm ,it would be at 6000
hence you get a bit more lag with a .63
regards mark
17-07-2007, 09:36 PM
#13
well i have the .48, and its almost lag free tbh,
with the .63 yes you will deffo notice it wont make its power as quickly, but on the open road wont run out of puff at the top like the .48 does
it all depends on wht you use the car for really ,as a dialy driver and odd track day like me ,the .48 is hard to beat, off the lights its proper ace
with the .63 yes you will deffo notice it wont make its power as quickly, but on the open road wont run out of puff at the top like the .48 does
it all depends on wht you use the car for really ,as a dialy driver and odd track day like me ,the .48 is hard to beat, off the lights its proper ace
17-07-2007, 09:54 PM
#19
i went to the 55lb set up ,and broke three gearboxes and front diffs in a year
so i had to spend 3.5k on a mullit straight cut box
turbos dont last that long at 32psi, well the last one didnt anyway
generaly the more boost you run the less reliable the car becomes
and then the brakes wernt good enough ,and so on and so on 15k lighter i still want more
so i had to spend 3.5k on a mullit straight cut box
turbos dont last that long at 32psi, well the last one didnt anyway
generaly the more boost you run the less reliable the car becomes
and then the brakes wernt good enough ,and so on and so on
15k lighter i still want more
17-07-2007, 09:56 PM
#20
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Lawnsy had the same problem twice recently, the wastegate arm was bending which ended up with the penny not sealing and it was stooooooopidly laggy and took a lot to make full boost. The resulting silly high temperatures which it produced trying to make its boost ended up destroying the exhaust housings. 
thats because it was .48 housing and was workin over time!!and mine 2wd so stronger the the chocolate MT75 
17-07-2007, 10:06 PM
#28
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JTECHSAFF what actuator do you run?
The problem with Lawnsys is cos he was using my Forge one, I dunno what the rating is but its running a white spring. To put it on with even the slightest tension it needed to be pressured up with a foot pump to around 45psi. We think its been under that much tension from the actuator that its bending the arm when its red hot.
The problem with Lawnsys is cos he was using my Forge one, I dunno what the rating is but its running a white spring. To put it on with even the slightest tension it needed to be pressured up with a foot pump to around 45psi. We think its been under that much tension from the actuator that its bending the arm when its red hot.
17-07-2007, 10:09 PM
#30
Originally Posted by BigErn
JTECHSAFF what actuator do you run?
The problem with Lawnsys is cos he was using my Forge one, I dunno what the rating is but its running a white spring. To put it on with even the slightest tension it needed to be pressured up with a foot pump to around 45psi. We think its been under that much tension from the actuator that its bending the arm when its red hot.
The problem with Lawnsys is cos he was using my Forge one, I dunno what the rating is but its running a white spring. To put it on with even the slightest tension it needed to be pressured up with a foot pump to around 45psi. We think its been under that much tension from the actuator that its bending the arm when its red hot.
17-07-2007, 10:11 PM
#32
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Re: Turbo failure questions!
Originally Posted by JTECHSAFF
but what would have made the housing crack like that
you're ringing the bollocks off the turbo
you could weld the wastegate shut and it wouldnt hold any more boost at high rpm!
17-07-2007, 10:13 PM
#33
Re: Turbo failure questions!
Originally Posted by Matt
Originally Posted by JTECHSAFF
but what would have made the housing crack like that
you're ringing the bollocks off the turbo
you could weld the wastegate shut and it wouldnt hold any more boost at high rpm!
17-07-2007, 10:23 PM
#35
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Re: Turbo failure questions!
Originally Posted by JTECHSAFF
Originally Posted by Matt
Originally Posted by JTECHSAFF
but what would have made the housing crack like that
you're ringing the bollocks off the turbo
you could weld the wastegate shut and it wouldnt hold any more boost at high rpm!
18-07-2007, 09:41 PM
#37
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Re: Turbo failure questions!
Originally Posted by JTECHSAFF
Originally Posted by G.B Turbo Solutions
camels
carl
carl
usually find it in rsturbos mainly though
the amount ive thrown in the bin, my scrap man loves me
sorry i didnt reply when asked, i had to go somewhere and do something, what it was i cant remember
but as matt has stated below
Originally Posted by Matt
Originally Posted by JTECHSAFF
but what would have made the housing crack like that
you're ringing the bollocks off the turbo
you could weld the wastegate shut and it wouldnt hold any more boost at high rpm!
18-07-2007, 09:45 PM
#39
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Originally Posted by abdr500
G.B Turbo Solutions
i sent you a pm did you get it
i sent you a pm did you get it
bollox...
yes i did, but been busier than mr busy
forgot to reply, sorry
heres my reply to pm
start with a better turbo
**cough T3 **cough
