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The mkiv Supra Owners Club

what bar boost?


craig l
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hi ive got a jspec 6sp tt what boost should i be running its got a blitz nur spec double decat restrictor ring hks induction thor fcd walbro fuel pump ngk laser platinum plugs sard bov. ive got a crappy raid boost gauge that flutters about 0.8 0.9 bar is this normal should it not be over a bar, what is standard boost cheers

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It is 0.76 bar stock, with the cats removed and no restrictor ring the boost overuns to 1.6bar plus. The idea with Jspecs is to fit a restrictor rings that will bring this down to your taregt boost (normally between 1 and 1.2bar).

 

You do not need a boost controller to acheive this. Try removing the boost controller and seeing what pressure you're getting, then work from there :)

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I don't think he mentioned a boost controller?

 

lol, ooops. Got mixed up with another thread! In that case ignore the bit above about the boost controller :rolleyes:

 

 

If its only reaching 0.8-0.9 bar then it could be one of a few things:

 

1) Restrictor ring is too restrictive

2) Boost gauge is reporting wrong pressure

3) wastegate/VSV fault maybe..

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thanks guys ye dont have a bc yet prob my next purchase the restrictor rings from chris wilson its a 1.1bar the boost gauge is a cheap raid one so might be that it doesnt go past a bar though it flickers round about the 0.8 0.9bar so what bar should it be with the mods

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thanks for the help guys ill have a look at the smic was thinking about replacing it soon anyway or going for a fmic cheers

 

A new SMIC will only raise your boost if it has a hole in it (very unlikely)

 

Check for boost leaks, get a decent boost gauge and go from there.

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