4-2-1 manifold will it accelerate better??

  1. Newbie Joined: Sep 2010 Jersey Posts: 15 Citroen Saxo VTS
    #1
    basically i have just put a supersprint full exhaust system on my vtr, but i have been told getting a supersprint 4-2-1 manifold to go with it will make the car accelerate alot better, is this true??
  2. Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS
    #2
    Quote:
    Originally Posted by matt-pinel View Post
    will make the car accelerate alot better, is this true??
    in a word. nope!
  3. Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)
    #3
    you will probably gain about 6 bhp with the manifold. You will notice the different but its not going to be over dramatic.
  4. Frequent Poster Joined: Nov 2009 Hull Posts: 983 01' Ph1 VTS
    #4
    as kamracing said you will see a small gain but nothing to write home about really. well worth the money though! wish i had the money to buy one off my mate i had a go in my car with one on and it felt slightly nippier but it could just be down to the old case of your mind is tricking you. every body has there opinions
  5. Regular Poster Joined: Nov 2010 worcester Posts: 471 saxo furio
    #5
    depends 16v you want 4-1 mani as they give more power and its already got a longer rev range as its a 16v.
    4-2-1 manis are for 8v as it gives them a longer rev range which is what an 8v needs.

    adsayer learn you volemetric efficiency
  6. Regular Poster Joined: Jan 2010 fife Posts: 429 gold mk2 vtr
    #6
    top answer ^ ^
  7. Regular Poster Joined: Nov 2010 worcester Posts: 471 saxo furio
    #7
    but i agree with joncarter does make the difference but nothing much
  8. Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)
    #8
    4-2-1 or 4-1, in reality makes bugger all difference on a road car. Theory is great but the reality is you will not notice unless the engine is at a state of tune to take advantage of it.
  9. Regular Poster Joined: Nov 2010 worcester Posts: 471 saxo furio
    #9
    exactly
  10. Saxperience Post Whore Joined: Dec 2002 United Kingdom Posts: 8390
    #10
    Quote:
    Originally Posted by danny-boi View Post
    depends 16v you want 4-1 mani as they give more power and its already got a longer rev range as its a 16v.
    4-2-1 manis are for 8v as it gives them a longer rev range which is what an 8v needs.
    a generalisation, and incorrect.
    1 user thanked this post:
  11. Super Moderator Joined: Nov 2009 Cambridge(ish), UK. Posts: 10581 BMW 5x M50d.
    #11
    Quote:
    Originally Posted by danny-boi View Post
    depends 16v you want 4-1 mani as they give more power and its already got a longer rev range as its a 16v.
    4-2-1 manis are for 8v as it gives them a longer rev range which is what an 8v needs.

    adsayer learn you volemetric efficiency
    Eh?

    A 4-1 will generally yield more power at the upper end of the rev range, whereas a 4-2-1 will generally give a better "spread" of the increase of power, with slightly less top end power than the 4-1 would give. Both are sensitive to cam timing, although the 4-1 much more-so. A 4-1 can often actually feel like it's reduced torque lower down the power band in real terms.

    Although I hate sweeping statements like that. But I hate inaccuracies even more...
  12. Newbie Joined: Sep 2010 Jersey Posts: 15 Citroen Saxo VTS
    #12
    sound cheers guys, im guessing that because i have a de-cat pipe and back box from supersprint it would be best to get a supersprint manifold?? and also one last question, will it make a difference to the sound??
  13. Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS
    #13
    Quote:
    Originally Posted by danny-boi View Post
    adsayer learn you volemetric efficiency

    erm... ok I will. Thanks for letting me know about this. Again, thanks.
  14. Established Member Joined: Nov 2010 Invergowrie Posts: 1006 Saxo VTR
    #14
    what if i get a new aftermarket exhaust system but still have standard manifold, will there be a difference???
  15. Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)
    #15
    Quote:
    Originally Posted by matt-pinel View Post
    sound cheers guys, im guessing that because i have a de-cat pipe and back box from supersprint it would be best to get a supersprint manifold?? and also one last question, will it make a difference to the sound??
    If you can afford it the supersprint is one of the best manifolds on the market. High quality materials, finished off the welds inside to get it smooth to maximise gas flow. They are a work of art.
  16. Frequent Poster Joined: Nov 2008 norwich Posts: 941 Citroen Saxo Westcoast MK1
    #16
    to give a short answer on a standard engine you will notice no real difference apart from maybe an exhaust note change if you have a nice system.
  17. Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)
    #17
    you will notice a slight difference. We are only talking around 6 bhp including the cat removal so its not a dramatic difference. Worth it though
  18. Frequent Poster Joined: Sep 2008 Stourbridge, Hagley Posts: 560 Astra MK4 GSi Turbo, Black
    #18
    i have got a KamRacing 4-2-1 to go on to my mk2 vtr which has already got a system on it and very slight breathing mods what can i expect from that?
    P.S the mani looks ace btw cannot wait to get it on
  19. Saxperience Forum Bum Joined: Apr 2010 Telford Posts: 4501 Black corsa c SXI.
    #19
    i want one but just to expensive.
  20. Regular Poster Joined: Nov 2010 worcester Posts: 471 saxo furio
    #20
    Quote:
    Originally Posted by adsayer View Post
    erm... ok I will. Thanks for letting me know about this. Again, thanks.
    sorry but we have done this and proved it that the shorter the pipe the quicker it is but lower top end, longer it is slower is but the higher the top end

    its basic volemetric efficiency