Thread: Overboost Troubleshooting

drover,
when you setup the boost gauge did you come from the wastegate actuctor???.if so does your gauge jump about when a load is put on the motor??.I have just opened up the exhaust on td5 00mod and its dam near impossible to read gauge under load.
It seems to spool up much quicker,but hard to check max psi.
cheers

wind your boost back! should be round 17psi!
if you want to run 25psi you need a little black box of electrickery to fool the ecu.

make sure there is not holes in the vacume line to the wastegate modulator.
the ecu is cutting fuel to the engine to limit damage.
check the length of your waste gate rod.

cheers phil

Originally Posted by tracker

drover,
when you setup the boost gauge did you come from the wastegate actuctor???.if so does your gauge jump about when a load is put on the motor??.I have just opened up the exhaust on td5 00mod and its dam near impossible to read gauge under load.
It seems to spool up much quicker,but hard to check max psi.
cheers

i welded mine into the steel tube between the turbo and the I/C, it reads fine, looks like this
http://www.youtube.com/watch?v=JuSNpCkaVaU
fluctuation of gauge is directly linked to what your right boot is doing.

cheers phil

Discowhite has nailed it....

Dial the boost back to 18psi max and you'll be fine without a "boost box"

thanks Phil,I like the movie,my needle swings wildly ,so much its hard to read psi. Boost gauge is used to check turbo and wastegate ,thats why the temp connection.

I think people maybe misinterpreting what I'm trying to achieve...

I'm NOT trying to overboost etc... I'm trying to figure out WHY it's doing it when it shouldn't!
I'm getting to 110-120km/h and the car starts kangaroo-ing... I'm assuming it's the ECU cutting in when it senses overboost (as it IS overboosting - as proven by the boost gauge)!

My mech boost gauge is T-eed into the wastegate actuator piping. It's a VDO, so it's not a crap quality one. No wild swinging of needle, it's smooth and related to right boot pressure.

I haven't done a thing to change the boost (haven't touched the thread), so I'm wondering why it's overboosting (ie why the wastegate isn't dumping the exhaust when it reaches 17-18psi)...

The wastegate works (that was the compressor test), but it's not doing it's job when the engine is running...! Is there any way of 'un sticky'-ing the wastegate, or, is there something else to look for???

Tombraider (aka Mike?), I'm not after any little black box... although, I'd like to know when you plan on getting some more silicon hoses into the country! Don't want to nag (I've sent a PM&email and no response)...

Cheers.

there is also another sensor on the intake manifold that can give you this fault check the plug has'nt come loose as mine did once giving that fault.

Check the small hose going to the waste gate solenoid from that steel pipe before the intercooler,they can get a crack in them where they push onto the nipples this has also happened to me aswell.

Originally Posted by stevo

there is also another sensor on the intake manifold that can give you this fault check the plug has'nt come loose as mine did once giving that fault.

Check the small hose going to the waste gate solenoid from that steel pipe before the intercooler,they can get a crack in them where they push onto the nipples this has also happened to me aswell.

Intake manifold sensor... would this cause overboosting? I thought the turbo/wastegate was a mechanical system...? I'll check either way.

The hose is fine, that was checked when I put the boost gauge in.

Anything else?

Cheers