Forged Pistons - mapping?

1. user_57322 Regular Poster Joined: Feb 2012 Posts: 334

   #1 3rd April 2012, 12:49

   If I were to run forged pistons in place of a de-comp plate, would I need to have the omex map tweeked? Or would it not be needed?
2. dannygti Saxperience Post Whore Joined: Feb 2006 dudley United Kingdom (England) Posts: 6790 106 gti/ SEAT LCR

   #2 3rd April 2012, 12:54

   Yes you would need it tweaked. There's no guarantee the compression would be the same.
3. jones91 Established Member Joined: Jun 2011 Bridgnorth (Shropshire) Posts: 2001 Jdm Dc2 Integra

   #3 3rd April 2012, 13:05

   As above, yes the mapping will need to be tweaked because forged pistons will probably be a different compression to a de-comp plate
   
   I'm pretty amazed your running 14psi on standard internals too
4. user_57322 Regular Poster Joined: Feb 2012 Posts: 334

   #4 3rd April 2012, 13:10

   Trust me, not every day I'm not
   
   Cheers for comments guys, didn't consider the compression differences... although it should of been obvious.
5. yr51ocw Frequent Poster Joined: Oct 2005 Posts: 751

   #5 3rd April 2012, 13:57

   compression will be different (no doubt), but also the change in the shape of the combustion chamber will effect the knock limit of the engine, so yes a quick overcheck/tweak of the map would be advised.
6. user_57322 Regular Poster Joined: Feb 2012 Posts: 334

   #6 3rd April 2012, 14:46

   Looks like I need to find someone to tweak my omex map in the midlands then.
   
   Would driving the car on low boost (approx 3psi) to the tuner's location cause any damage?
7. jones91 Established Member Joined: Jun 2011 Bridgnorth (Shropshire) Posts: 2001 Jdm Dc2 Integra

   #7 3rd April 2012, 16:10

   It might be best just to go back to where you first had it mapped, I think some places might knock a bit off the cost if you used them beforehand
8. user_57322 Regular Poster Joined: Feb 2012 Posts: 334

   #8 3rd April 2012, 16:52

   Sounds like a plan, providing it'll not be destroying the engine driving it lightly
9. yr51ocw Frequent Poster Joined: Oct 2005 Posts: 751

   #9 3rd April 2012, 16:56

   I would is there anyway you can access the software and change some settings yourself? If so, I would retard the ignition by 3deg in the section of the map you plan on using when driving to get the car mapped.
   
   That said, its only a safety measure. Unless it was mapped right on the knock limit and the new pistons make things alot worse there shouldnt be too much in it. Does the omex have the function to change the igntion when detecting knock?
10. user_57322 Regular Poster Joined: Feb 2012 Posts: 334

    #10 3rd April 2012, 17:19

    " Knock sensing capability" is part of the Omex 600's features.
    
    I'll see what I can do with the map myself, Omex's are notoriously hard to connect to laptops due to old rs232 connections
11. jones91 Established Member Joined: Jun 2011 Bridgnorth (Shropshire) Posts: 2001 Jdm Dc2 Integra

    #11 3rd April 2012, 17:44

    Personally mate I would just completely leave the map alone until you get to the mappers, with changing just the pistons I would of thought as long as you keep the revs below 3 - 3.5k the engine should cope ok until you get to the mappers
12. ThrushMotorsport Established Member Joined: Jan 2011 Aberdeen Posts: 1092 Turbo Saxo vtr, 2010 Octavia VRS TSI, mk3 Ibiza cu

    #12 3rd April 2012, 17:47

    Keep it out of boost as much as you can, and you should be fine.

    1 user thanked this post: blackie_2k5
13. user_57322 Regular Poster Joined: Feb 2012 Posts: 334

    #13 3rd April 2012, 18:34

    I'll be able to travel at around 2.75 - 3k easily. Good peace of mind then. Cheers guys.
    
    On a similar note, I'll be upgrading my VTS coilpack to a ford pack and HT leads - will this change the ignition output - thus meaning tweaking of the map for this too?
    
    Just wondering if I can get away with fitting HT leads now, or if I should wait until I upgrade the pistons too.
    
    Cheers
14. welshpug Saxperience Forum Bum Joined: Jul 2010 South Wales Posts: 3078 ZX 16v, 205 GTI, 309 Goodwood, 405 MI16.

    #14 3rd April 2012, 18:57

    got a wideband gauge?
15. user_57322 Regular Poster Joined: Feb 2012 Posts: 334

    #15 3rd April 2012, 19:45

    Got one I'll be fitting next week
16. user_57322 Regular Poster Joined: Feb 2012 Posts: 334

    #16 4th April 2012, 16:42

    Quote:

    Originally Posted by Greedo I'll be upgrading my VTS coilpack to a ford pack and HT leads - will this change the ignition output - thus meaning tweaking of the map for this too? Just wondering if I can get away with fitting HT leads now, or if I should wait until I upgrade the pistons too. Cheers

    Can anyone shed some light on this?
17. tweeqd Established Member Joined: Mar 2006 Farnham Surrey Posts: 1542 AX GT 16v turbo 6 speed with NOS 205 gti6 E 320

    #17 4th April 2012, 16:48

    swapping the leads will have no affect on the map
18. user_57322 Regular Poster Joined: Feb 2012 Posts: 334

    #18 4th April 2012, 17:06

    But a car that never ran leads....?
19. user_39871 Regular Poster Joined: Dec 2009 wednesbury Posts: 451 Yes

    #19 4th April 2012, 17:21

    Quote:

    Originally Posted by Greedo But a car that never ran leads....?

    No mate changing to ht lead set up won't affect the map
20. user_57322 Regular Poster Joined: Feb 2012 Posts: 334

    #20 4th April 2012, 17:42

    Awesome, cheers chaps. Appreciate it