Boost leak i think

[GaseJo]

Hi,

Took my car for a little spin after it all going back together.

It seems to me i have a boost leak but it is strange. when i accelerate (not hard as it has not been mapped yet) when she gets to 1500ish i get a sound like a party blower. This is nowhere near the first turbo kicking in (I think) so can this be a boost leak? When i accelerate abit harder i can feel the first turbo kick in and she pulls hard but the sound is still there but does not get any louder. When i let off i get the ppsssttttt of the dump valve. I would appreciate some help because i dont want to take her for a mapping session with a leak as it would be a waste of time and money.

Cheers Garith.

[GaseJo]

Another question:-

The knock reading on the apexi !! does this indicate if the engine is running lean and that detination might occur. I am saying this because the exhaust smells abit like fuel & the most knock i have seen on the knock reading is 15. Is there a safe limit for knock. I want to get this boost thingy sorted so if i drive it hard and keep within a certain knock limit would this be safe to do?? And what is a safe limit for the knock reading before detination occurs?


Cheers Garith.

[SiH]

Can\'t help with the knock - the highest i\'ve ever seen is 30.
But the squeal - does it sound a bit like someone blowing over a blade of grass? My guess would be either tubby>Manifold gasket, or block>manifold.

[GaseJo]

Hi,

I have just gone fore a little drive and accelerated in 3rd turbo kicked in and boost went to about 7 1/2 this if i am right is stock boost level so i presume no boost leak!!!!

Sih yes that is pretty much the sound i am hearing but will i be seeing the above boost if the gasket is gone or the manifold is blocked???

Cheers Garith.

[SiH]

Yeah, if it\'s only a small leak - the turbo will keep spinning and supplying pressure until it reaches the boost level set by the actuator, so you can have a reasonably large leak and you\'ll ge the turbo spinning it\'s nuts off and still producing decent boost.

I don\'t know if it\'s the same for the FD, but in my experience with other turbo car\'s that\'s the classic symptom of one of the above gaskets on it\'s way out.

[GaseJo]

How hard of a job is it to change the gasket??? would the turbo\'s need removing? And could it damage the turbo\'s if i keep driving it?

Garith.

[SiH]

Depends which one it is, Not anything i\'ve ever looked at on an FD, but i\'m about 90% sure you\'ll need to take tubbies off at a minimum

[GaseJo]

Thats a big job to do which i dont really want to do unless i know for definate that the problem is the gasket anyone else got any thoughts on this?

Garith.