[giannis]

hi,this is my first message and i am not good in english.i would like someone to help me identify my problem.i own a mazda rx7 fd3s with a turbonetic t88 on it,and suddendly the car couldnt boost beyond 0 bar.i was driving normally and while i was accelerating the avcr was showing me 1.1bar as usual.i parked the car and when i started again i had no boost.this happened about a month ago,and i havent solve the problem yet.
pipings(custom) ok
intercooler(greddy) ok
vacum hoses(samco) ok
inlet manifold (greddy)ok
hossings ok
avcr ok
solenoids ok
external(hks)ok
throtlebody(greddy) ok
exhaust pipe complete ok
exhaust manifold(sb) ok
blow of valve(godzilla) ok
microtech management(no error indicated) ok
engine compression ok
inlet filter ok

i have checked all the above very carefully and everything seems to work more than fine.
the turbo(that has no more than 10.000miles)seems to me the most possible cause,but i have checked the
following and cant find something wrong.
the axial play is close to zero
there is no oil on the inlet or the outlet
there are no funny noises
i pushed the front part of the axle hard with my hand and turned it with my fingers but it was reving freely(while the engine was hot and not working)same thing from the rear side,every thing ok.
with the engine hot i reved until 9000rpm and the turbo didnt seem stuck or something else and also it started
spooling whilst i was cranking.
i removed the front part to check for any blade wear or housing wear,all ok.
i removed the downpipe and inserted a microcamera between the blades,not even a scratch.
turbo oil inlet outlet,oil prefilter and restrictor ok
i drove the car without exhaust,nothing

the problem is that everything seems to be ok,the engine runs smoothly,but when i push the gas pedal
it seems to me like i am not pushing it and the engine producess no more than a 100 horse power(the car has pulled up to 871bhp at 1.6bar on the dyno,but in everyday driving it was working at 1.1bar producing 424bhp according to the dyno.)


the turbo is a t88(t-1143ordered with ball bearing and different specs that i cant recall right no and i cant trust the local turbo service stores because they havent even heard of turbonetics.

please advice.

[Robert]

Originally Posted by giannis

hi,this is my first message and i am not good in english.i would like someone to help me identify my problem.i own a mazda rx7 fd3s with a turbonetic t88 on it,and suddendly the car couldnt boost beyond 0 bar.i was driving normally and while i was accelerating the avcr was showing me 1.1bar as usual.i parked the car and when i started again i had no boost.this happened about a month ago,and i havent solve the problem yet.
pipings(custom) ok
intercooler(greddy) ok
vacum hoses(samco) ok
inlet manifold (greddy)ok
hossings ok
avcr ok
solenoids ok
external(hks)ok
throtlebody(greddy) ok
exhaust pipe complete ok
exhaust manifold(sb) ok
blow of valve(godzilla) ok
microtech management(no error indicated) ok
engine compression ok
inlet filter ok

i have checked all the above very carefully and everything seems to work more than fine.
the turbo(that has no more than 10.000miles)seems to me the most possible cause,but i have checked the
following and cant find something wrong.
the axial play is close to zero
there is no oil on the inlet or the outlet
there are no funny noises
i pushed the front part of the axle hard with my hand and turned it with my fingers but it was reving freely(while the engine was hot and not working)same thing from the rear side,every thing ok.
with the engine hot i reved until 9000rpm and the turbo didnt seem stuck or something else and also it started
spooling whilst i was cranking.
i removed the front part to check for any blade wear or housing wear,all ok.
i removed the downpipe and inserted a microcamera between the blades,not even a scratch.
turbo oil inlet outlet,oil prefilter and restrictor ok
i drove the car without exhaust,nothing

the problem is that everything seems to be ok,the engine runs smoothly,but when i push the gas pedal
it seems to me like i am not pushing it and the engine producess no more than a 100 horse power(the car has pulled up to 871bhp at 1.6bar on the dyno,but in everyday driving it was working at 1.1bar producing 424bhp according to the dyno.)


the turbo is a t88(t-1143ordered with ball bearing and different specs that i cant recall right no and i cant trust the local turbo service stores because they havent even heard of turbonetics.

please advice.

Have you tried pressurizing the cold side after the compressor to see if there is a leak under pressure? If the turbo is spinning its either losing all boost from a pressure leak or not actually spinning fast enough to create positive pressure. If you hook a pressure gauge to the compressor outlet port does it show any positive pressure?

[giannis]

thanks for the quick response robert.i have done what you said.with the compressor outlet closed the pressure in the housing reaches 0.5bar maximum,with the engine reving more than 9000rpm.same thing before the throttlebodies(intercooler circuit)no leak at all.the turbine wheel spins free but when i close the outlet it reducees speed in about half(if i can tell from the noise).
let me know how can we indentify the turbo,what steps must i follow,should i send it to you for repair or to the closest dealer,can i order a complete rebuild kit,or a new turbo would be safer.
sorry if i made you go dizzy.

[Robert]

Originally Posted by giannis

thanks for the quick response robert.i have done what you said.with the compressor outlet closed the pressure in the housing reaches 0.5bar maximum,with the engine reving more than 9000rpm.same thing before the throttlebodies(intercooler circuit)no leak at all.the turbine wheel spins free but when i close the outlet it reducees speed in about half(if i can tell from the noise).
let me know how can we indentify the turbo,what steps must i follow,should i send it to you for repair or to the closest dealer,can i order a complete rebuild kit,or a new turbo would be safer.
sorry if i made you go dizzy.

The compressor is going to lose speed when you close the inlet as there is no air flow when you are revving the engine. What I was referring to was capping the compressor inlet and using an air compressor to pressurize the cold side (not the engine) and see if it holds pressure.

[giannis]

sorry if i miss understood you,but i have allready done earlier this test with capping and pressurizing with external compressor and there was no leak.

[Robert]

Well if you think its the turbo contact Customer Service at 805-581-0333 and ask for Benita. She can help with either parts or having the turbo returned for service.

[giannis]

thanks