no boost on my gt4 st205 Options

[pikey]

hi can anyone help me please! went to drive my car back from my army camp and it had been working fine in the morning. obviously i let it warm up before i give it any kind of boost, at least 1/4 up the temp guage. the car was warm and i put my foot down. there was hardly any power with the boost going to 0 wich is vaccum pressuer i believe. theres a strange whining noise aswell.

ive had the turbo off and its all fine, there was however a little oil in the induction pipe but not much. ive checked all the vaccum and boost hoses and they seem fine. in a nutshell im running a motec m4 pro ecu with 1.1bar boost, 3inch exhaust from the turbo with 2.5inch restrictor so its not overboosting and a few other bits but theyv all been on for at least 6 months with no problems.

so all i can think of is maybe the actuator or a sensor or something. can anyone shed any light or give me any contacts please thanks

This post has been edited by pikey: Mar 18, 2009 - 8:09 AM

[delusionz]

sounds like what happened to my gt-four. the turbo shaft in my ct20b had excess play and the blades rubbed against the housing... expensive turbo rebuild... however for u since u have an aftermarket ecu u can go straight for a brand new garett instead of a reconditioned toyota turbo. wish i had the same option because the cost would have been the same.

[Cuts_the_Pilot]

what dump pipe you using?

some have been known to jam the wastegate open, which gives the same result.

[pittfirefighter]

yes if you inspected the turbo then check your wastegate... if the pressure went to 0... then the turbo is somewhat working... you never reach 0 vacuum on a N/A car... it wont be vacuum hoses because with that much leak then your car would not stay running... it has to be with the turbo itself or wastegate... might also be a huge exhaust leak before the turbo but you would notice that sound...

[pikey]

sounds like what happened to my gt-four. the turbo shaft in my ct20b had excess play and the blades rubbed against the housing... expensive turbo rebuild... however for u since u have an aftermarket ecu u can go straight for a brand new garett instead of a reconditioned toyota turbo. wish i had the same option because the cost would have been the same.

ive got some play on the shaft so myb and it wines but only a little and not constantly. would putting a garret gt28 on work or would it over work the engine?

what dump pipe you using?

some have been known to jam the wastegate open, which gives the same result.

not even a year old blitz ssq but will tell the garage to have a look as its an option

[pikey]

yes if you inspected the turbo then check your wastegate... if the pressure went to 0... then the turbo is somewhat working... you never reach 0 vacuum on a N/A car... it wont be vacuum hoses because with that much leak then your car would not stay running... it has to be with the turbo itself or wastegate... might also be a huge exhaust leak before the turbo but you would notice that sound...

ive got an aussie down pipe and front pipe both with the heat coating and a full blitz nur spec system. theyv had the down pipe off but it looked ok and thats where my custom restrictor is 2 that theyv put on another gt4 thats fine so i can mayb rule that out. so ill tell them to have a look at the wastegate and actuator

thanks for all the help so far guys keep it coming lol im drivin my grandads rover 75 atm and its really not the same!

what dump pipe you using?

some have been known to jam the wastegate open, which gives the same result.

by the way how many versions of your car wer made, what extras do they have and why were they made?

[Cuts_the_Pilot]

There was 77 ST205 Group A Rallye's delivered to Australia.

all have leather interior, manual air con, intercooler water spray, water injection, antilag, headlight washer squirters, factory fog lights, dashlight dimmer control, obviously the spoiler riser blocks, bonnet wing, drivers airbag, sunroofs on 17 of them (of which mine is one), the rest is normal gtfour stuff.


basically they came with every available option appart from climate control.

there might be more but thats all i can think of at the moment.

[pikey]

mine has all of that bar the headlight washers and sunroof. never seen another gt4 with my dimmer switch either but i havnt got a plaque and its a jap import so im probs not as lucky as you. so u think i could go for a garret and run it safely?

[pikey]

turns out it was the turbo. ive now got a stage 2 hybrid c20b on but got to w8 till april 30th to get a remap! so in the mean time ive got to take it easy and after being without it for 3 weeks its torture!

[Cuts_the_Pilot]

sorry man missed your last post let us know how it goes