i have ls vtec fully built untuned, i am trying to test out the turbo befor i tune, and it boost 5 psi at around 4000rpm.. isnt that a little bit late for a 60/63 trim precision turbo?.... iam thinking its because the car is running too rich because no o2 sensor...... but i could be wrong.. could the O2 sensor cause the turbo not to spool right because its just shooting unburnt gas into the turbine?????

 

lack of o2 sensor has nothing to do with it. when you go WOT it ignores it anyway. do you have any boost leaks?

 

i dont think so i tightend all the couplers with t clamps pretty good

 

TUNE IT BEFOR YOU GET ON IT

 

Agree

 

well i got a pretty good exhast leak from the wastegate flange

 

[QUOTE=turboman2.2;42336322]i have ls vtec fully built untuned[QUOTE]

No tune = super lean leading to boost. You are probably detonating a thunderstorm, ruining your pistons and valves, not to mention not making any power. That is one reason why it's spooling late.

NExt, if you have *ANY* leak in the charge pipes or the exhaust (before the turbo), it will spool very late. If your exhaust is leaking enough where dead exhaust gasses are being sucked into the turbo's inlet, you're spooling even later because you can't burn dead exhaust gas. Read up on Direct Exhaust Injection and why it's not helpful.

 

I think you are kind of confusing a wastegate with a BOV.

A wastegate opens to control boost, which means, once desired boost pressure is obtained it opens, bypassing exhaust gases from the turbine to the ground or to the downpipe. which in turn slows down the turbine keeping a constant boost pressure on the compressor side.

However, any exhaust leak pre-turbine will cause spool issues.

 

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/thread

 

Originally Posted by lookout22 View Post
when you let off the gas the valve opens and the waste gate will release.


lol......

 

yea yea im a douche. it was late and i was stoned. and when you let off the gas the waste gate closes .. i dont know what i was thinking...