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Wastegate issues - what to do


Bazza-NZ

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Hi guys

I'm fixing up a twin turbo at the movement and it currently doesn't boost on the seconardy turbo I.e 4,500 rpm plus. I've got great solid boost on primary and then nothing after that. Both turbos are a bit old so I've obtained some replacements (issue might not be turbo related??)

The issue I have is the secondary turbo I've purchase doesn't have an internal wastegate like the original. Is there any work around here? Need to double check but I believe they are the same turbo which I find strange.

Can I just block off the hose and run without it?

Car is BG5A 1994

Any help is appreciated

Thanks

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 Rosssub said:
So yours is a rev A (bg5A) with VF13/VF14? Sounds like you may have brought a VF18/VF19 from a rev C, where the secondary wastegate is no more. Should be numbers stamped on the front of the turbos.

The car is definitely BG5A and I'm assuming turbo are still stock on it. Ill have a look at the new turbo for a code but I have a feeling you're right.

Can I just stick the rear exhaust housing over or are they different sizes?

NOTE (Just checked the turbos and they are a Vf20 & Vf21)

Edited by Bazza-NZ
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 lachlan said:
the secondary wastegate wasnt actually used unless there was a massive overboost

Interesting so I could potentially just block off the vac line and use the other turbo without any issues?

Does it mean the boost is effectively held using the ECV and primary wastegate...

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Yes you can just block off the secondary WG actuator hose and run without one. Also correct on the ECV and primary WG controlling boost.

As Lachlan said it only ever opened with an over boost, so pretty much does nothing. Doesn't even run a duty cycle AFAIK, just connected to manifold pressure with an on/off solenoid.

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 Rosssub said:
Yes you can just block off the secondary WG actuator hose and run without one. Also correct on the ECV and primary WG controlling boost.

As Lachlan said it only ever opened with an over boost, so pretty much does nothing. Doesn't even run a duty cycle AFAIK, just connected to manifold pressure with an on/off solenoid.

Perfect, Thanks for all your help, we'll be pulling out the motor next weekend to tidy up the car so i'll make sure everything is in working order before doing the turbo swap.

Also what vacuum line would you tee a boost gauge into on these?

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