Waste gate settings for a 35r and 4202r?

Klutch · May 29, 2016

Just took it for a rip. Max boost is about 72psi. Back pressure reads 87, but either the factory pressure sensor only reads to 87 or it's the dash daq I use for monitoring.

So should I be pushing the 4202 up to 72psi or should I back it off?

Six_Sloww · May 29, 2016

That's total boost, not just the 4202

Jonnydime · May 29, 2016

You need to run a boost gauge on the primary turbo as well so you can see the difference. Don't dash daq's read psia and not psig.

Klutch · May 29, 2016

Yes that's right total. Makes sense. I'll see about adding a gauge after primary. I'll check the dash daq as well. What does absolute tell me other than adding atmosphere to gauge pressure ?

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Jonnydime · May 29, 2016

I think they only read the exhaust in psia and boost in psig. If that is the case your boost to back pressure is nearly 1:1.

Klutch · May 29, 2016

Yes gotcha. I just checked you're right. Exhaust is psia. You can get both on on boost tho. My 72psi boost reading is from my waste gate controller. So it is psig. Seems like the dash daq stops reading at 87 on the exhaust. So not real sure what bp is. Could be higher. I guess I could keep setting the waste gate lower and lower until I see the bp change lower off 87.

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Jonnydime · May 29, 2016

That's why I ran stand alone boost and back pressure gauges when dialing in my setup.

Klutch · May 29, 2016

For bp, did you tee off somehow off the factory bp location?

Gotta say, today was the first day running the GH tunes, and it ran pretty hard!

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Jonnydime · May 29, 2016

I ran a separate bp sensor off of the intermediate pipe to read the back pressure in between stages. As for overall back pressure I used the factory gauge but since I am running a minimax it subtracts atmosphere for you. I know for a fact my factory gauge reads higher than 87psia since I regularly see around 80psig.