turbo help?

[littleblue1]

Hi

Basically I have put my boost guage in but the guy I brought the turbo kit off said he set it to 8 psi ...my boost guage is reading 4 psi can't hear any boost leaks and the guage sits dead on 4 psi!! What psi can I run on standard internals without melting or doing any damage??

[SnakeVTR]

This is abit of a grey area, most will say 7psi on standard internals (ie GMC i believe) but others may say 8-10 psi

[littleblue1]

I have got a cam and I have heard of vtr being being compression ratio's which I take it that means u can run different boost!?

[SnakeVTR]

I have got a cam and I have heard of vtr being being compression ratio's which I take it that means u can run different boost!?

I think most vtr turbo conversions have the decomp plate or multiple head gaskets fitted to increase the combustion chamber size = lower compression. This will mean more boost can be ran with more safety/reliability yes :y:, obviously you would need to remove the cylinder head and fit this yourself

[littleblue1]

Without decompression plate how much psi on standard internals then? Safely but still quick!!

[SnakeVTR]

I would have thought 6-7 psi max, but i wouldnt recommend not fitting a decompression plate anyway. I f you try to add forced induction to an already optimal compression ratio then you might have issues, Im sure many people dont bother but if you want reliability its recommended. But budget is an important factor. Also if you do fit a decomp plate its future proof as 7psi will soon be boring to you and youl want to turn it up lol :y:

[littleblue1]

True say mate. How much are de-compression plates? And this car has been done properly nothing bodged! Its been off the road for 2 weeks getting everything perfect as can be... True I'm going to up it to 6 and see what happens

[SnakeVTR]

IIRC they are only around the £50-70 mark, they are designed to be fitted inbetween two head gaskets i.e one under and one on top of the decomp plate :y:

[blackie_2k5]

Decomps do not go between two head gaskets


And a good quality decomp will cost over £100,

I have a second hand Ferriday engineering one for sale for £70 delivered if your interested, done 5k miles and cost me £130

[littleblue1]

I mite take that off you but ill let you no! Basically I jus tried turning the boost up another psi on a manual boost controller and it has made fuk all difference... Does this mean the wastegate is set to 4 psi and the only way or over riding it is to go and get an electronic boost controller ??

[blackie_2k5]

No it means either the boost controller or the actuator is fucked

Provided you have everything set up

What is controlling your fuelling

[littleblue1]

MF2 and 4 bar regualtor is... This is all new to myself tbh never ever done anything like this so learning a lot of new stuff

[littleblue1]

And standard injectors! Looking into getting GTI-6 injectors apparently there a straight fit

[blackie_2k5]

your going to melt your engine try to mess about with no knowledge of what your doing

how many extra injectors have you got in currently?

[littleblue1]

I got a friend of mine helping me who has built a 2.0l mg turbo who has some clue haha! And 1 others injector

[SnakeVTR]

Decomps do not go between two head gaskets


And a good quality decomp will cost over £100,

I have a second hand Ferriday engineering one for sale for £70 delivered if your interested, done 5k miles and cost me £130

How can they not? You can't have a decomp plate on either the head or the block with no gasket inbetween??? the combustion chamber wouldnt seal :geek:

[SnakeVTR]

http://i834.photobucket.com/albums/zz270/snakevtr/decomp.jpg
Is this wrong or just an alternate way to lower compression in higher power engines, i have heard of a hight-temp non setting sealent used on a decomp plate but never seen it used :panic:

[blackie_2k5]

You can do it that way, but not many do anymore, only ever seen it done the way on minis and metros


Non setting sealant is the best way to do it, as it doesn't restrict the heat flow as much

[SnakeVTR]

You can do it that way, but not many do anymore, only ever seen it done the way on minis and metros


Non setting sealant is the best way to do it, as it doesn't restrict the heat flow as much

Ah i see, you learn something new every day :y:

[blackie_2k5]

I think the days of gasket either side were just a case of "we know we need to lower the compression"

And not much else went into it, most stuff I've read about gasket either side would say that the compression ratio ends up really low, bu I suppose it depends on the size gaskets and decomp your using... And of course the CR of the engine to begin with

[littleblue1]

Are vtr CR 10:1 to start off with? In theory running a decomp plate means you can run more boost? And how can I lower my inlet temp?? Any idea's

[littleblue1]

Are vtr CR 10:1 to start off with? In theory running a decomp plate means you can run more boost? And how can I lower my inlet temp?? Any idea's