JP4 head fitting... need remap or will plug and play?

1. user_27198 Saxperience Forum Bum Joined: Sep 2008 Exeter - Devon Posts: 3179 Nitrous'd Saxo VTS '52 Plate (S33 VTS)

   #1 28th February 2011, 23:48

   I was pondering the other day as to if with the bigger valves and slight differences internally in the head if you can just drop a JP4 head on the J4 bottom end etc without any mating problems with the intake manifold and if you need tha car mapped with the head?
   
   Im unsure if having the bigger valves but not having the ECU mapped would cause problems? or does it mean that everything just inhales and exhails quicker/better?
   
   Cheers all
2. Sophia_Bush Saxperience Post Whore Joined: Jan 2007 Shropshire Posts: 9994 Moonstone Blue 106 GTi

   #2 1st March 2011, 00:16

   obv remap be best but will run fine
3. user_27198 Saxperience Forum Bum Joined: Sep 2008 Exeter - Devon Posts: 3179 Nitrous'd Saxo VTS '52 Plate (S33 VTS)

   #3 1st March 2011, 20:55

   cheers dude
   
   Is there anyone who does remapping of stock ecu's which they would recommend?
4. user_9396 Established Member Joined: Apr 2006 torquay (England) Posts: 1993 supercharged vts. 1.1 saxo. accord type r

   #4 1st March 2011, 21:37

   valves can catch standard pistons.
   use j4 valve springs collets, followers.
   j4 pulleys. j4 cams. (altho they dont sit perfectly on the valves)
   the j4 intake wont line up with the jp4 mounting points.
   not many places remap standard ecu, but wayne at chipwizards is probably the best known for results with the standard ecu.
5. Kyza Established Member Joined: Apr 2010 Posts: 1016

   #5 1st March 2011, 21:41

   Quote:

   Originally Posted by Lippy cheers dude Is there anyone who does remapping of stock ecu's which they would recommend?

   Wayne at chip wizards is highly reccomended for the triple plug ECU's.
6. Sophia_Bush Saxperience Post Whore Joined: Jan 2007 Shropshire Posts: 9994 Moonstone Blue 106 GTi

   #6 1st March 2011, 21:42

   valves be fine as long as you use right hg and dont bugger timing up to badly
7. Andy_K Saxperience Post Whore Joined: Jan 2004 in the garage trying to fix the car Posts: 5882 Mondeo st tdci & Supercharged vts

   #7 1st March 2011, 21:48

   Along same lines........
   
   
   What happens to the sump breather on the J4? The one that runs up and connects to the side of the head? as the JP4 doesnt have the correct hole. Just block it off? or connect somewhere else?
   
   Sorry for the slight hi-jack
8. Sophia_Bush Saxperience Post Whore Joined: Jan 2007 Shropshire Posts: 9994 Moonstone Blue 106 GTi

   #8 1st March 2011, 22:00

   easy you have the breather from the top cam cover if using j4 covers routed to go to it
9. sn3ddon Established Member Joined: Apr 2010 falkirk Posts: 1032 renualt Clio 1.5 dci

   #9 1st March 2011, 22:31

   im selling the head of my c2 vts and inlet manifold if you need anything
10. user_27198 Saxperience Forum Bum Joined: Sep 2008 Exeter - Devon Posts: 3179 Nitrous'd Saxo VTS '52 Plate (S33 VTS)

    #10 2nd March 2011, 08:44

    So what size HG is correct? in mm?
    
    So am I correct in saying that you use the sump from the J4 and that it has a breather pipe which id connect to one of the 2 rocker cover outlets?
    
    Ive not noticed the sump breather before somehow... could I connect the sump breather to my catch tank?
    
    Nice to know that chipwizards are there if I decide not to go for standalone management although it seems like a no brainer if I go far with engine mods
11. user_9396 Established Member Joined: Apr 2006 torquay (England) Posts: 1993 supercharged vts. 1.1 saxo. accord type r

    #11 2nd March 2011, 11:41

    Plans for the future say u want standalone mate
12. white_vtr Frequent Poster Joined: May 2009 newcastle Posts: 921 Bianca gti on bodys Black evo 9

    #12 2nd March 2011, 17:03

    someone told me i could use all the internals of the c2 head with standard saxo vts cams depending on the head gasket used, but im also unsure of what head gasket to use. any info would be good.
13. user_27198 Saxperience Forum Bum Joined: Sep 2008 Exeter - Devon Posts: 3179 Nitrous'd Saxo VTS '52 Plate (S33 VTS)

    #13 10th March 2011, 09:29

    anyone got any idea on HG size?
14. Sophia_Bush Saxperience Post Whore Joined: Jan 2007 Shropshire Posts: 9994 Moonstone Blue 106 GTi

    #14 10th March 2011, 10:03

    well JP4 uses 0.6mm one as standard and the J4 uses the 1.6mm iirc? I'd use the J4 one
15. user_39461 Super Moderator Joined: Nov 2009 Cambridge(ish), UK. Posts: 10581 BMW 5x M50d.

    #15 10th March 2011, 10:43

    Quote:

    Originally Posted by Sophia_Bush well JP4 uses 0.6mm one as standard and the J4 uses the 1.6mm iirc? I'd use the J4 one

    100% use the J4 one on an engine with the JP4 head on the J4 block - the pistons and valves will be too close for comfort otherwise.
16. user_27198 Saxperience Forum Bum Joined: Sep 2008 Exeter - Devon Posts: 3179 Nitrous'd Saxo VTS '52 Plate (S33 VTS)

    #16 10th March 2011, 10:46

    1mm difference will that mean that my compression is going to lower itself my an amount that will change the way the car runs... or is the jp4 head 1mm shorter
    
    

    Quote:

    Originally Posted by RossDagley 100% use the J4 one on an engine with the JP4 head on the J4 block - the pistons and valves will be too close for comfort otherwise.

    does that mean that sophia's measurements are off then as j4 is smaller gasket than jp4 one according to the above and would mean closer pistons or an i wrong?
17. Sophia_Bush Saxperience Post Whore Joined: Jan 2007 Shropshire Posts: 9994 Moonstone Blue 106 GTi

    #17 10th March 2011, 11:03

    different as the JP4 pistons have a slight dome to them so c/r is slightly higher that way so smaller gasket. But with the JP4 head have bigger valves using the J4 gasket is the best way to go to avoid problems.
    
    With the difference you won't notice a difference will be barely noticeable
18. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

    #18 10th March 2011, 11:04

    might as well not bother and stick a set of cams in the original head.
19. user_27198 Saxperience Forum Bum Joined: Sep 2008 Exeter - Devon Posts: 3179 Nitrous'd Saxo VTS '52 Plate (S33 VTS)

    #19 10th March 2011, 11:46

    Quote:

    Originally Posted by Sophia_Bush different as the JP4 pistons have a slight dome to them so c/r is slightly higher that way so smaller gasket. But with the JP4 head have bigger valves using the J4 gasket is the best way to go to avoid problems. With the difference you won't notice a difference will be barely noticeable

    Cheers dude
    
    

    Quote:

    Originally Posted by KamRacing might as well not bother and stick a set of cams in the original head.

    My car has been running rich for about 8 months so I wanted to get the head cleaned up & pistons etc and whilst I was at it I thought I would swap the head for the JP4 and put the j4 internals in there, I want to be able to fit the alloy c2 vts inlet and plumb in direct port nos.
    
    Inlet looks better and better suited for direct port nos imo.
    
    I would like to fit some mild cams something like PH2's, not a fan of the lumpy idle with PH3/708's equivalent...
20. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

    #20 10th March 2011, 12:27

    you may find that if you deviate from standard cams you are going to get contact unless you use pistons with larger valve cutouts. Theres no problem with idle with the Cat Cam 708s if you get the car mapped properly.