Quickgti1.8t

Basically if i go over 20psi it does some weird things. The needle goes back and forth VERY fast. ay 25psi it worse it goes back and forth like 3-4psi diff. I think its the MBC, do you think a EBC would fix the problem or should i change my wastegate its a 38mm with 1 bar spring. Turbo is a GT35R .63

Quickgti1.8t

Quickgti1.8t

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Quickgti1.8t &raquo;</TD></TR><TR><TD CLASS="quote"> </TD></TR></TABLE>

non-VTEC

what size is the spring in the wastegate?

a MBC sometimes has a hard time controling boost if you try to more than double the spring pressure it was designed for.

Quickgti1.8t

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by non-VTEC &raquo;</TD></TR><TR><TD CLASS="quote">what size is the spring in the wastegate?

a MBC sometimes has a hard time controling boost if you try to more than double the spring pressure it was designed for.</TD></TR></TABLE>
1 bar, i heard it doesn't really matter if u double the pressure of the wastegate spring

Quickgti1.8t

Tony the Tiger

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1 bar, i heard it doesn't really matter if u double the pressure of the wastegate spring</TD></TR></TABLE>

Boost is going to become unstable if you are running a lot more boost than the base WG spring pressure. Try to swap to a higher PSI spring, closer to the boost you are intended to run

Quickgti1.8t

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tony the Tiger &raquo;</TD></TR><TR><TD CLASS="quote">

Boost is going to become unstable if you are running a lot more boost than the base WG spring pressure. Try to swap to a higher PSI spring, closer to the boost you are intended to run </TD></TR></TABLE>
wouldn't part throttle be crappy with a bigger spring

Tony the Tiger

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Quickgti1.8t &raquo;</TD></TR><TR><TD CLASS="quote">
wouldn't part throttle be crappy with a bigger spring</TD></TR></TABLE>

Heavier spring = less wastegate movement.

If part throttle becomes crappy, your engine needs some love... Get it tuned.

Quickgti1.8t

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tony the Tiger &raquo;</TD></TR><TR><TD CLASS="quote">

Heavier spring = less wastegate movement.

If part throttle becomes crappy, your engine needs some love... Get it tuned.</TD></TR></TABLE>
hmmmm might order a small spring to make it around 18psi daily

Bailhatch

I agree that you may be too far over the WG spring. It could also be a combination of the WG design and boost controler design too.
The ball and spring/bleeder style boost controlers that TXS sells work awesome to over 30psi if the rest of your hardware it up to par.

Quickgti1.8t

right now i have a spring/ball with bleeder. I had a TXS and it sucked even more then this one

Dunc

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Quickgti1.8t &raquo;</TD></TR><TR><TD CLASS="quote">
wouldn't part throttle be crappy with a bigger spring</TD></TR></TABLE>

You shouldn't be boosting like 20psi+ boosting in part throttle anyways

Quickgti1.8t

tried running off the wastegate and it was smooth then did it again and after 6k rpm it was steddy again