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The mkiv Supra Owners Club

3" Blitz decat pipe Question


SamuraiFlash

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Just one more question Nic, i have taken up enough of your time alreay :D, the question is, will i need a restrictor ring installed if I have a boost controller? Or do i need both regardless?

 

A boost controller can only raise the boost, it cannot lower the boost. You'll need a restrictor ring on a J-spec because with both cats removed the wastegate is overwhelmed and cannot regulate the boost to a safe level. The restrictor ring adds a restriction in the exhaust to keep the boost pressure to a safe base level, the diameter of the hole in the restrictor ring regulates what that base level is ie. you could fit a restrictor ring so the base level is 1bar, then use the boost controller to raise the boost pressure.

Edited by Nic (see edit history)
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I know it was aimed at Nic but the BPU page says that for a J-spec, you'll need a boost controller to raise the boost and a restrictor ring to stop it going too high. So yeah, you'd need both :)

 

You may just need to fiddle with the size of the hole in the RR to get the boost to where you want it. Oh and a boost gauge to keep an eye on it!

 

Thanks Josh :)

 

Can a boost controller be used to Raise and lower boost, so basically will i be able to go back and forth from stock boost to 1bar when ever i want?

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A boost controller can only raise the boost, it cannot lower the boost. You'll need a restrictor ring on a J-spec because with both cats removed the wastegate is overwhelmed and cannot regulate the boost to a safe level. The restrictor ring adds a restriction in the exhaust to keep the boost pressure to a safe base level, the diameter of the hole in the restrictor ring regulates what that base level is ie. you could fit a restrictor ring so the base level is 1bar, then use the boost controller to raise the boost pressure.

 

Thanks alot for all your help Nic, its appreciated bud......I have been educated :)

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Thanks Josh :)

 

Can a boost controller be used to Raise and lower boost, so basically will i be able to go back and forth from stock boost to 1bar when ever i want?

 

What he said! :D

 

But yeah, most of them just put the boost back to the stock level when you turn the controller off.

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Thanks Josh :)

 

Can a boost controller be used to Raise and lower boost, so basically will i be able to go back and forth from stock boost to 1bar when ever i want?

 

If its an Electronic boost controller then yes.

 

I ran a greddy Profec b spec 2 on my MR2 turbo and it had a high and low setting for the boost. So i had it set to stock pressure and then 1.1bar.

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Can a boost controller be used to Raise and lower boost, so basically will i be able to go back and forth from stock boost to 1bar when ever i want?

 

Most electronic boost controllers have at least 2 boost settings you can choose between ie. with the boost controller turner off you would see the base boost pressure of say 1bar - regulated by the size of the restrictor ring - you could then have a low setting for say 1.1bar and a high setting of 1.2bar.

 

The more expensive boost controllers have features such as 'Gain' and mapping of the boost settings against speed, throttle position, revs, etc.

 

The 'Gain' feature makes a big difference to how quickly the turbos spool up, by controlling how the wastegate opens.

 

Being able to map the boost settings against speed, etc. you can maximise the boost through all gears ie. so you can hit a stable 1.2bar in 1st gear and in 6th gear.

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