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Boost In Neutral.

odessy

By odessy,
in Engines & Forced Induction

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gotRICE? Veteran

gotRICE?

Posted
Posted (edited)

This happened when my timing was out a little bit at cruise loads, after a 15 min drive at 100km/h :) (just an oversight.. thats what you get when you drink too much rum the night before then try tune on V and Pies :) )

P8200006.jpg

I have pictures of EVERYTHING! LOL. Like to keep my work documented.

Edited by gotRICE?
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Kenna802 Experienced

Kenna802

Posted
Posted

This happened when my timing was out a little bit at cruise loads, after a 15 min drive at 100km/h :) (just an oversight.. thats what you get when you drink too much rum the night before then try tune on V and Pies :) )

P8200006.jpg

I have pictures of EVERYTHING! LOL. Like to keep my work documented.

Was that timing or Afr's? If so what was wrong Too lean Or 2 Advanced
Manuel Kasko Grand Master

Manuel Kasko

Posted
Posted

Wasn't any recommended brands in there.

Also wrt to the boost gauge. Is it going to give an incorrect reading where it is? Or is it just not good to have it there.?

It's on the line that controls the fuel pressure so if it pops off for any reason then you can do some damage.

Try moving it to the back of the plenum against the fire wall just tap into the factor vac line

It will run off a nipple (har har I said nipple)

Heads towards the brake booster into a little black box.

If you cant find it send me a message and I'll take a pic of mine tomorrow

0408 257 613

odessy Enthusiast

odessy

Posted
  • Author
Posted (edited)

So if the timing is too retarded then the air will still be in a state of combustion during the exhaust stroke and this extra pressure that usually drives the cylinder down will begin to spool the turbo?

Why would an atmospheric blow off valve cause boost to build in neutral?

Edited by odessy
The Dan Grand Master

The Dan

Posted
Posted

Why would an atmospheric blow off valve cause boost to build in neutral?

It won't.

They will all make some boost on free rev. Just not 10psi. More like 1-2psi and that's purely due to exhaust volume and turbine speed. If your ignition timing is retarded it makes the engine work harder/labour more and therefore will build more boost. Probably still not 10psi

odessy Enthusiast

odessy

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Posted (edited)

^ Yeah from reading 10psi seems to be a bit. I can hear the turbo spooling up so I don't think it's faulty boost gauge. Builds boost gradually until I take my foot of the accelerator. Any idea? Ill try get a video up in the next day.

Still going to check the timing anyways.

Edited by odessy
odessy Enthusiast

odessy

Posted
  • Author
Posted (edited)

Well I hope it isn't the timing being too retarded as my CAS has next to no adjustment left to advance it(Almost turned as far counter-clockwise as it can). I haven't had the time to get a timing light and really play around with it yet, just having study breaks and speculating/stressing out.

If the timing is too retarded and I can't advance it far enough, could this be due a mistake being made when the timing belt had been replaced?

Edited by odessy

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