ardasaliah Posted July 22, 2006 Share Posted July 22, 2006 My car is totally stock! and boosting to about 0.7 bar. I notice yesterday that the car was boosting at 0.9 bar steadily. I had a look at the pipe work to the wastgate and to my surprise the pressure pipe had popped off the wastgate. Surely if that happened the cars boost should have sky rocketed as the wastgate function was taken away. Which is what I would have expected. Or do you think the cats + stock exhaust saved me certain engine/turbo damage. Link to comment Share on other sites More sharing options...
Lucifer Posted July 22, 2006 Share Posted July 22, 2006 The cats and exhaust would have stopped over boosting there sir. But you were very lucky. Link to comment Share on other sites More sharing options...
SteveR Posted July 22, 2006 Share Posted July 22, 2006 Wouldn't he have hit fuel cut if it had risen to dangerous levels?? Link to comment Share on other sites More sharing options...
ardasaliah Posted July 22, 2006 Author Share Posted July 22, 2006 Wouldn't he have hit fuel cut if it had risen to dangerous levels?? O yes:rolleyes: . so would have been fine then. Just curious to why it did not go above 0.9bar. Link to comment Share on other sites More sharing options...
JohnA Posted July 22, 2006 Share Posted July 22, 2006 ..Surely if that happened the cars boost should have sky rocketed as the wastgate function was taken away. Which is what I would have expected. . 'Sky'rocketing is a relative term It depends on how tight the wastegate spring is. It keeps the wastegate from opening when pushed by the gases on the other side (commonly refered to as 'backpressure') With minimised backpressure, a UKSpec can go up to 21-24psi if the wastegate is disconnected. (also depends on the age of the spring, ambient air temp etc) . Or do you think the cats + stock exhaust saved me certain engine/turbo damage. yeah, they contribute to the higher 'backpressure' that pushes the wastegate earlier. Fuel cut would have kicked in a bit later anyway, and in any case the engine wouldn't be damaged at these levels - it runs very rich from the factory. Neither would the turbos be damaged. Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 22, 2006 Share Posted July 22, 2006 I am currently running in TTC mode and due to VSV/ECU problems, and i am just running boost on the STD waste gates setting and restrictor ring, it seems to be reasonably steady at 1.2 bar with the odd spike to 1.2.5 I'm wondering if fitting an electronic boost controller would help spool up and limit the spikes? Link to comment Share on other sites More sharing options...
JohnA Posted July 22, 2006 Share Posted July 22, 2006 ..I'm wondering if fitting an electronic boost controller would help spool up and limit the spikes? Anything that keeps the wastegate from seeing pressure before it's time can only help spoolup. My favorite is a simple MBC (ball and spring). No wires, no bling, no nonsense. £15-odd from freebay (an Ozzie fella was selling them at the time) Link to comment Share on other sites More sharing options...
Marty Posted July 22, 2006 Share Posted July 22, 2006 Because you have a uk spec they arent prone to overboostin like j-specs O yes:rolleyes: . so would have been fine then. Just curious to why it did not go above 0.9bar. Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 22, 2006 Share Posted July 22, 2006 I suppose its worth a try, as i could just link the two waste gates together with the MBC plumbed into the plenum. Link to comment Share on other sites More sharing options...
JohnA Posted July 22, 2006 Share Posted July 22, 2006 Over 4Krpm even the sequential is like being in TTC mode. At that stage there is only *one* effective wastegate. Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 22, 2006 Share Posted July 22, 2006 Trouble is there is something very strange with my sequential system, i think it relates to the ECU control of two of the VSVs, i can only get it to boost to 1.2 bar in TTC mode, although i must admit i haven't put it back into sequential mode to double check the VSV problem, i like the TTC mode;) however the problem seems to lie with the first turbo waste gate VSV, but there are other VSV related problems to. Link to comment Share on other sites More sharing options...
JohnA Posted July 23, 2006 Share Posted July 23, 2006 The first turbo 'wastegate' cannot act as a wastegate when both turbos are in song on the stock manifold (because of the way it is plumbed) Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now