I'd be very grateful if anyone could give me some clues as to why my terzo has suddenly developed a huge over boost problem.

It was fine yesterday boosting as usual to around 1.1bar, this morning it's boosting over 1.5bar. I think if i kept my foot on the pedal it would keep going further too!!!

It's a 98 terzo, engine mods are... unichip, full decat, blitz induction, VTA DV.

I managed to adjust the boost via a bleed valve previously, i adjusted that again this morning but have been unable to test it yet.

I can't help wondering why it suddenly developed this problem though.....

Chris

 

Split actuator hose maybe?

 

errmm.. this is where I look incredibly stupid... where is that mate?

 

The 'vacuum' hose that goes to the actuator on the turbo.

The actuator opens the internal wastegate at a predetermined pressure...If there is a split in the hose, there will not be enough pressure generated to open the actuator, therefore boost will keep increasing.

Just a thought...might not be it though?

Also check the integrity of the vacuum hose on the compressor side of the turbo

Regards

 

Thanks fiestaboy... will check all the hoses this weekend... for now i managed to get it under control by adjusting the bleed valve.