I have a t34 with a -31

I've wound the arm out for less boost as it was over boosting before

it hits 0.6bar now but it does not hold it it just keeps going up the higher the revs build.

Would could this be.

 

Guess size of the turbo/to strong an actuator if you only want 6 odd psi ?

Is this on a Datsun ?
Tell me its a 240z

 

my S2 used to do this i never did find out what it was. love to know the answer!

 

is it a dodge wastegate not sealing or is it the actuator spring.

It only that low as it being run in

 

I Wish
just a GtiR with a few mods added for fun

 

A Nissan

 

does the wastegate move fee and unobstructed?

 

Found this last night

Turbo Boost Creep and Spiking


Boost creep is rising boost due to not enough exhaust bypassing the housing. For example, you're set for 13 psi, and when you floor it, you get a quick rise to 13 or 14 psi. But then as rpm's climb, the boost creeps higher and higher: 14, 15, 16, 17, etc. Enlargening the wastegate hole is one cure for boost creep, as you did.

Spiking is when your wastegate hole is large enough, but your actuator can is taking too long to fill with compressed air, so you *temporarily* overshoot your boost level. Example: you're set for 13 psi, and when you floor it it quickly rises to 16 psi, but then gradually drops downward towards 13 psi again.

A common problem with modded engines is a combination of spiking AND boost creep. That's where you're set for 13 psi, and when you floor if it overshoots to 16 psi, *begins* to drop back down, but as the rpm's rise it goes up again!

Normal boost rise when set to 13 psi = shoots up to 14, then 13, 13, 13...
Spiking = shoots up to 16, then 15, 14, 13, 13, 13...
Boost creep = shoots up to 14, then 13, 13, 14, 15, 16, 17...
Spiking and boost creep = shoots up to 16, then 15, 14, 13, 14, 15, 16,17...
Set a manual boost control to 11 psi and floor it slowly in high gear. It should go to 11 psi and hold it pretty well. If it starts to slowly climb over 11 psi as the rpm's get high, that's "creeping". The boost creeps higher at high rpm's because there's too much exhaust flow for the wastegate hole to bypass.

Now go to 11 psi again, but tromp on it quickly! It will shoot to 13, or 14, or 15 psi, then drop down to 11 and stay there. That's "spiking".

Spiking is a quick flash of high boost that goes a little beyond your set boost point. If you are set for 11 psi, and you tromp on it quickly, this might happen: boost "spikes" to 14, quickly drops to 11, then slowly "creeps" back to 14 or more as the rpm's climb. Now you are seeing spiking followed by creeping!

 

some ones been doing their homework. mine must have been 'creeping'.

 

same as.

I've been told another way to stop boost creep is to weld up the waste gate and install an exturnal one.

Has anyone done this if so how hard is it to do.