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Overboosting Help. R32 Rb20det Rb25 Turbo

Anthony9five
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Anthony9five Apprentice

Anthony9five

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Hey guys,

I have a r32 with an rb20det and an rb25 turbo. The turbo blew up and i replaced it with another rb25 turbo. Ever since replacing it the boost pressure wont limit itself. Anything over 3500-4000rpm causes the boost pressure to spike. It got to around 15 psi before i backed off to avoid damaging the turbo or other components. I have a turbosmart boost tee installed which was set to 12psi before swapping turbos and worked perfectly. After this issue i wound it right back to see if that was the issue but im still having the same problem.

Any ideas on what the problem would be?

EDIT: Sorry I just realised I posted in the wrong spot. Not sure how to delete.

Edited by Anthony9five
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Anthony9five Apprentice

Anthony9five

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Well seeing as the waste gate Controls boost it would be wise to check you plumbed it up correctly.

What else could have changed?

Ill triple check that in the morning but im pretty sure its plumbed up correctly.

Thats what has me confused. Ive checked all the basic stuff and no luck. Im just hoping for ideas on things I may have missed.

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Anthony9five Apprentice

Anthony9five

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What happens when the boost controller is removed wastegate is plumbed directly?

I haven't tried that yet as I don't have a length of pipe long enough. I'm not gonna rule that out, but the boost controller was working perfectly before the turbo swap. If i cant fix it ill buy some pipe and try that though

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Anthony9five Apprentice

Anthony9five

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Are you sure your hoses are going into the correct ports on the solenoid?

Any pics?

Ill grab some pics in the morning.

The point is the wastegate may not even be opening sufficiently due to a physical obstruction or a problem with the actuator.

Could be a dodgy Watergate or possibly the flap is fouling on the dump pipe

How would i diagnose this? And then how would I fix it if it is the issue?

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Anthony9five Apprentice

Anthony9five

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Are you sure your hoses are going into the correct ports on the solenoid?

Any pics?

http://i949.photobucket.com/albums/ad335/anthony9five/2015-07-03%2009.27.23_zpss9z4upqv.jpg

http://i949.photobucket.com/albums/ad335/anthony9five/2015-07-03%2009.27.43_zpskufbszgc.jpg

http://i949.photobucket.com/albums/ad335/anthony9five/2015-07-03%2009.27.53_zps7ntxoacl.jpg

http://i949.photobucket.com/albums/ad335/anthony9five/2015-07-03%2009.28.24_zpsyqvsfmpb.jpg

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Anthony9five Apprentice

Anthony9five

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To diagnose the wastegate flap fouling you need to disconnect the wastegate and swing the flap to see if it opens.

I did this and the flap moves easily. Not fouling on anything.

Is the boost T the right way? They are a one way valve inside.

I can't tell if the boost source for the turbo actuator is coming from the BOV or not, it should come from the piping.

Yeah the boost tee is the right way. There is an arrow on it that has to be pointed towards the wastegate, which it is.

The boost source is coming from the piping not the BOV.

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mad082 Grand Master

mad082

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As has been said, try running the wastegate straight from the piping.

There is always the chance though that the wastegate itself is damaged. If you have a pump you could attach it to the line to the wastegate and see if it opens when pressure is applied (or if the diaphragm in the wastegate is damaged)

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blind_elk Grand Master

blind_elk

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The diaphragm in your wastegate actuator might be damaged. If you still have the old turbo, maybe you could swap actuators and see if you still have the same problem.

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zoomzoom Mentor

zoomzoom

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Kinugawa makes an actuator where you can replace the springs to suit the boost level you want to run.

I am using one on a hypergear turbo, although I had to make a new bracket in order to mount it to the turbo. Its supposed to fit a stock turbo though.

http://www.ebay.com.au/itm/Kinugawa-Adjustable-Turbo-Wastegate-Actuator-Nissan-Skyline-RB25DET-R33-/291501973534?pt=LH_DefaultDomain_15&hash=item43dedf201e

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