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The mkiv Supra Owners Club

Boost Controller Discusssion


Nic

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I blew a small hose off the other day whist driving, which caused the boost to go way high, luckily my boost gauge warned me and I backed off. I reconnected the hose once home and all was normal again.

 

The interesting thing though, was that whilst driving with the hose off, the turbos spooled up a LOT quicker than usual, ie. I was getting full boost a lot earlier than normal.

 

This got wondering whether if it would be possible to get the same fast spooling, but still be able to cap the boost to a safe level. For example if the electronic valve was fully open initially to allow the turbos to spool up as quickly as possible, but as boost increased would close to limit max boost. Are there any boost controller that opperate like this, or are they all basically as an electronic bleed valve ie. that opens the valve a predetermined amount.

 

BTW, my turbos run in parallel and I have an HKS EVC5 fitted, base boost is restricted to around 1bar, I then use the BC to increase boost to 1.3bar. Is there another boos controller that would be better for my set up?

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This got wondering whether if it would be possible to get the same fast spooling, but still be able to cap the boost to a safe level.

 

Yes you can, manual boost controllers (when set up correctly!) can do exactly that.

It's a well-known 'trick' in fact.

Theoretically EBCs should also cater for this, but apparently they tend to pulse the wastegate open even when you expect them not to.

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Sounds like the behavior of the GReddy PRofec e-01 I have. When I turn it off the turbos spool much later. It's definitely not just for controlling peak boost, it also helps it to boost earlier.

Same with my Apex-i AVCR.

 

 

Some people have one of the VSV's (EGBV I think?) bypassed and say they get quicker spool. haven't tried it myself

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You can usually adjust some sort of gain or feedback loop control, which seems to be a way of saying "I'm going to leave the wastegate fully shut until the last second", thus giving you the fastest possible spoolup. Aaaaaand a big spike of overboost as the wastegate can't bring the boost down at the drop of a hat :) So it's a balance between the two. I get 0.1bar spikes at the moment, which I can live with for now (I'm gonna do so much fettling when the weather gets better I can tell you)

 

-Ian

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