Back to a virtual car again!!!

[sadgoth]

well, the AA took the car down to Tim\'s yesterday and Tim has looked at the boost controller and Microtech readings, it appears that the boost spiked to 1.94BAR  !!!!!! Which would do it  We now need to strip it down and see what\'s left of the front rotor & housing!  

I also need to find out why the WG failed to open if the boost controller was switched off with no restriction in the air flow through the solonoid. Ho hum, I\'m taking Friday off work to go to RX Motors and see WTF is going on

[G@NDY]

1.9 bar:2eek:2eek guess that would do it.

What make of wastegate was it Mark?

[sadgoth]

Turbosmart so it is a decent WG and it was working fine off the spring but as soon as the SBC went in (even though it was off and therefire not interrupting air flow in the boost pipe) it managed to hit 1.9 Bar! Weird thing is I didn\'t even have my foot on the loud pedal very much as I hadn\'t set up the boost controller. The Dash unit went up to 6psi and I came off the throttle so the spike must have been a split second, but hey a even a microsecond at that boost level I gues would be enough. More investigation is needed...

[Timrxmotors]

also along with rhdjapan prices for housings, you should try one of Garys Gasket sets very good price £135 squids plus you can actually reuse the most of the seals (viton) if you have to split the block again http://www.rotaryart.uk.com/acatalog/RotaryArt_engine_kits_for_Mazda_RX7.html
cheaper and better then the Mazdas stuff now

Have you used one of these seal sets? No way better than the Mazda set.Good for cracking plates on FD engines.Ask gary how much R&D he has done.:Talking1
Mark\'s car will be fine once we have boost control.and rebuild the engine! Guess the apex seal went through the turbo,as the wastegate was shut.

[sadgoth]

Mark\'s car will be fine once we have boost control.and rebuild the engine! Guess the apex seal went through the turbo,as the wastegate was shut.

let\'s hope not, could really do without having to rebuild the turbo!

[grinder]

sounds like a open wallet and drop pants situation

[Brett]

Thats not looking good Mr Goth - will mail you tomorrow to get all the gory details...

[sadgoth]

well tomorrow will tell, I\'m off to RX Motors to strip the engine and see what damage I managed to cause :o

[BenLewisMav]

Have you used one of these seal sets? No way better than the Mazda set.Good for cracking plates on FD engines.Ask gary how much R&D he has done.:Talking1
Mark\'s car will be fine once we have boost control.and rebuild the engine! Guess the apex seal went through the turbo,as the wastegate was shut.

Why are they good for cracking plates Tim? Is it because the water seals are stronger they don\'t break, and as a consequence the plates end up taking the strain? (Kind of like if you use a 1.3bar radiator/coolant cap instead of a 0.9bar one it doesn\'t fail early enough and causes more overheating damage?)
Or is it just \'cause they don\'t fit properly?

[BenLewisMav]

well, the AA took the car down to Tim\'s yesterday and Tim has looked at the boost controller and Microtech readings, it appears that the boost spiked to 1.94BAR  !!!!!! Which would do it  We now need to strip it down and see what\'s left of the front rotor & housing!  

I also need to find out why the WG failed to open if the boost controller was switched off with no restriction in the air flow through the solonoid. Ho hum, I\'m taking Friday off work to go to RX Motors and see WTF is going on

Sorry if I\'m being stupid (as this is more of a question of how the boost controller works) but surely if the boost controller is off (but still plumbed in) then the actuator solenoid will always stay closed, then the actuator/wastegate will never see positive pressure, and not open? Or is it the other way round? That its always flowing through until a signal triggers it to shut?
(I know this wasnt exactly the case with you, as you said it was working fine for most of the time)

If the latter then maybe something earthed or shorted out and caused it to close up long enough to overboost? Or maybe something like a sticky WG?
Anyways would be useful to hear what you find (if you don\'t mind!).

[Prof]

Sorry if I\'m being stupid (as this is more of a question of how the boost controller works) but surely if the boost controller is off (but still plumbed in) then the actuator solenoid will always stay closed, then the actuator/wastegate will never see positive pressure, and not open? Or is it the other way round? That its always flowing through until a signal triggers it to shut?
(I know this wasnt exactly the case with you, as you said it was working fine for most of the time)
 
If the latter then maybe something earthed or shorted out and caused it to close up long enough to overboost? Or maybe something like a sticky WG?
Anyways would be useful to hear what you find (if you don\'t mind!).

If the boost controller is off, the wastegate should see only spring pressure - so you can still make boost - just not as much.

[sadgoth]

If the boost controller is off, the wastegate should see only spring pressure - so you can still make boost - just not as much.

that was my understanding too, who knows the answers should become clear today

[sadgoth]

really isn\'t good news!

so damage report:
2 broken apex seals
1 destroyed housing
1 destroyed rotor
1 destroyed turbine wheel from a brand new turbo :Grrr

pics of the carnage to follow when my PC plays the game:

[L18M]

ouch!!
thats gotta hurt =(

[grinder]

bloody hell matey - really sorry to hear that