Boost gauge questions

[misfit77]

So installed the boost gauge today. I will post pics of the custom pod later.

I hooked up my VW and Miata from the intake manifold just like all the pic here @ DSM Tuners, but I am pretty sure when I slowly give it throttle and in neutral the vacuum goes to zero.

My 96 GS-T does not, vacuum actually increases.

Also the car is stock, I am second owner. I added a Dejon intake and removed the restrictor on wastegate. Somehow I am spiking at nearly 18PSI. I have a brand new from Jegs VDO gauge, not the best brand but descent.

Are these 2 symptoms normal?

 

[bratte88]

Could the car have been tuned? You can check the ECU for "tamper".

Use this thread, it'll talk about the ECU.

http://www.dsmtuners.com/threads/dsm-maintenance-guide.476550/

 

[misfit77]

The car was owned by a 60+ old lady and she bought it new in 1996.
I seriously doubt its tuned. On the way to work it hovered around 15 after the spike.

Checking accuracy at work today.

 

[misfit77]

Just checked my gauge with calibrated equipment. My VDO gauge is nearly spot on.

Could the spike be from a sticky waste gate solenoid?
I am also curious if it is the wrong one. VW'ers can switch to a Audi solenoid that reacts slower for quicker spool.

 

[mjdarg]

Did you remove the boost control solenoid and run the vacuum line on the j-pipe straight to the wastegate actuator?

 

[misfit77]

no I left it alone. I don't know what boost the actuator is set for.

 

[John Myers]

can you post a pic of how you have your wastegate lines hooked up?

 

[pauleyman]

The spike is normal on a stock setup. Especially the tiny t25

 

[bratte88]

The car was owned by a 60+ old lady and she bought it new in 1996.
I seriously doubt its tuned. On the way to work it hovered around 15 after the spike.

Checking accuracy at work today.

Ha darn, nice pickup! Ya I doubt its tuned also. Good luck finding your issue though man

 

[misfit77]

I noticed that my idle was kinda rough today. So I double checked my routing at the Fuel Pressure solenoid and at idle it wasn't open after a few revs it opened back up and allowed air to be sucked in.

Anyway, here is my wastegate pics.

Wastegate - Side view

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Between wastegate and Solenoid - top view

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Solenoid -Side View

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