turbo help?

1. littleblue1 Frequent Poster Joined: Sep 2010 High wycombe Posts: 698 2000 mk2 vtr

   #1 26th May 2012, 22:18

   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??
2. user_43898 Established Member Joined: May 2010 leicester Posts: 1446 Clio 182 Inferno

   #2 26th May 2012, 22:19

   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
3. littleblue1 Frequent Poster Joined: Sep 2010 High wycombe Posts: 698 2000 mk2 vtr

   #3 26th May 2012, 22:23

   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!?
4. user_43898 Established Member Joined: May 2010 leicester Posts: 1446 Clio 182 Inferno

   #4 26th May 2012, 22:27

   Quote:

   Originally Posted by 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!?

   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 , obviously you would need to remove the cylinder head and fit this yourself
5. littleblue1 Frequent Poster Joined: Sep 2010 High wycombe Posts: 698 2000 mk2 vtr

   #5 26th May 2012, 22:42

   Without decompression plate how much psi on standard internals then? Safely but still quick!!
6. user_43898 Established Member Joined: May 2010 leicester Posts: 1446 Clio 182 Inferno

   #6 26th May 2012, 22:47

   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
7. littleblue1 Frequent Poster Joined: Sep 2010 High wycombe Posts: 698 2000 mk2 vtr

   #7 27th May 2012, 08:51

   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
8. user_43898 Established Member Joined: May 2010 leicester Posts: 1446 Clio 182 Inferno

   #8 27th May 2012, 12:31

   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
9. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #9 27th May 2012, 12:39

   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
10. littleblue1 Frequent Poster Joined: Sep 2010 High wycombe Posts: 698 2000 mk2 vtr

    #10 27th May 2012, 16:15

    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 ??
11. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

    #11 27th May 2012, 17:01

    No it means either the boost controller or the actuator is fucked
    
    Provided you have everything set up
    
    What is controlling your fuelling
12. littleblue1 Frequent Poster Joined: Sep 2010 High wycombe Posts: 698 2000 mk2 vtr

    #12 27th May 2012, 17:26

    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
13. littleblue1 Frequent Poster Joined: Sep 2010 High wycombe Posts: 698 2000 mk2 vtr

    #13 27th May 2012, 17:29

    And standard injectors! Looking into getting GTI-6 injectors apparently there a straight fit
14. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

    #14 27th May 2012, 17:34

    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?
15. littleblue1 Frequent Poster Joined: Sep 2010 High wycombe Posts: 698 2000 mk2 vtr

    #15 27th May 2012, 18:13

    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
16. user_43898 Established Member Joined: May 2010 leicester Posts: 1446 Clio 182 Inferno

    #16 27th May 2012, 18:21

    Quote:

    Originally Posted by 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

    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
17. user_43898 Established Member Joined: May 2010 leicester Posts: 1446 Clio 182 Inferno

    #17 27th May 2012, 18:25

    
    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
18. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

    #18 27th May 2012, 18:36

    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

    1 user thanked this post: user_43898
19. user_43898 Established Member Joined: May 2010 leicester Posts: 1446 Clio 182 Inferno

    #19 27th May 2012, 23:44

    Quote:

    Originally Posted by 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

    Ah i see, you learn something new every day
20. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

    #20 27th May 2012, 23:52

    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
21. littleblue1 Frequent Poster Joined: Sep 2010 High wycombe Posts: 698 2000 mk2 vtr

    #21 28th May 2012, 08:17

    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
22. littleblue1 Frequent Poster Joined: Sep 2010 High wycombe Posts: 698 2000 mk2 vtr

    #22 28th May 2012, 08:23

    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