power loss

1. rosebud Newbie Joined: Nov 2005 stoke Posts: 24

   #1 5th September 2006, 11:30

   hi everyone.just wondering ive had some work done to my vtr by epmotorsport including modified head and cam,bigger valves,chipped.full custom sports exhaust including 4into1 manifold.theres a big difference now much more power.it will rev easily to 7000rpm in all gears except 5th at about 6000revs in 5th there is a sudden power loss.the revs and speed just drop off any ideas why.thanks
2. CampDavid Saxperience Post Whore Joined: May 2006 Bedford Posts: 7457 Saxo VTS Peugeot 306 GTI-6 Astra SRI

   #2 5th September 2006, 11:56

   well, 6grand in 5th should be about 150mph, so thats possibly why
3. Sean Saxperience Post Whore Joined: Feb 2005 St Andrews United Kingdom (Scotland) Posts: 7384 Green mk1 vtr/s and Focus zetec

   #3 5th September 2006, 11:57

   you dont have the power to redline in 5th gear with the modifications you've done. you'd need a turbo or supercharger to hit top speed in 5th
   6k in 5th on a vtr is 135.4mph, n/a vtr couldn't hit that.
4. rosebud Newbie Joined: Nov 2005 stoke Posts: 24

   #4 5th September 2006, 12:08

   yes i know your probably right about it needing to be super or turbo charged to hit that but on the motorway it did hit 135mph then it makes like a slipping noise and the power just drops off for a second.same happens in the other gears go to about 7500rpm and something slips and i lose power.
5. Sean Saxperience Post Whore Joined: Feb 2005 St Andrews United Kingdom (Scotland) Posts: 7384 Green mk1 vtr/s and Focus zetec

   #5 5th September 2006, 12:15

   you hit 135 on your speedo, probably around 120-125 in reality. and when you say 'chipped' i hope you meant remap and not superchip otherwise all your engine is doing is revving higher and making a lot of noise for no particular reason. (twat for driving at that speed on the motorway by the way)
6. rosebud Newbie Joined: Nov 2005 stoke Posts: 24

   #6 5th September 2006, 12:28

   yes very sorry for driving that fast.just had to test it out.but if my rev counter says im doing 6000rpm then surly i am going that speed .thanks for your replies.
7. Sean Saxperience Post Whore Joined: Feb 2005 St Andrews United Kingdom (Scotland) Posts: 7384 Green mk1 vtr/s and Focus zetec

   #7 5th September 2006, 12:30

   you're engine doesnt have the power to hit that speed. problem solved.
8. S34MER East Midlands Joined: Jun 2006 Derby Posts: 8305 Skoda Fabia VRS

   #8 5th September 2006, 12:53

   Quote:

   Originally Posted by rosebud yes very sorry for driving that fast.just had to test it out.but if my rev counter says im doing 6000rpm then surly i am going that speed .thanks for your replies.

   dyno it then dip-shit, that will give you all the performance figures you need, THAT WILL TEST IT OUT! and its LEGAL!
9. DAZ1985 Frequent Poster Joined: Jan 2006 Stoke on Trent United Kingdom (England) Posts: 700

   #9 5th September 2006, 17:03

   Quote:

   Originally Posted by seanvtr81 you dont have the power to redline in 5th gear with the modifications you've done. you'd need a turbo or supercharger to hit top speed in 5th 6k in 5th on a vtr is 135.4mph, n/a vtr couldn't hit that.

   Or a short ratio box will let you hit the limiter in 5th on a slight down slope but then top speed is lost anyway.
10. DAZ1985 Frequent Poster Joined: Jan 2006 Stoke on Trent United Kingdom (England) Posts: 700

    #10 5th September 2006, 17:05

    Quote:

    Originally Posted by rosebud hi everyone.just wondering ive had some work done to my vtr by epmotorsport including modified head and cam,bigger valves,chipped.full custom sports exhaust including 4into1 manifold.theres a big difference now much more power.it will rev easily to 7000rpm in all gears except 5th at about 6000revs in 5th there is a sudden power loss.the revs and speed just drop off any ideas why.thanks

    Why the need to hit the limiter in a VTR i dont no all pulling power (torque) is lost after 4k tops
11. CampDavid Saxperience Post Whore Joined: May 2006 Bedford Posts: 7457 Saxo VTS Peugeot 306 GTI-6 Astra SRI

    #11 5th September 2006, 17:18

    Quote:

    Originally Posted by DAZ1985 Why the need to hit the limiter in a VTR i dont no all pulling power (torque) is lost after 4k tops

    No idea what affect camshafts have on an engine then?
    
    Performance cam = torque band moves further up rev range
12. rosebud Newbie Joined: Nov 2005 stoke Posts: 24

    #12 5th September 2006, 17:36

    Quote:

    Originally Posted by S34MER dyno it then dip-shit, that will give you all the performance figures you need, THAT WILL TEST IT OUT! and its LEGAL!

    had it on a rolling road dipshit 140bhp and it can rev to 6000rpm in 5th
13. Sean Saxperience Post Whore Joined: Feb 2005 St Andrews United Kingdom (Scotland) Posts: 7384 Green mk1 vtr/s and Focus zetec

    #13 5th September 2006, 19:34

    Quote:

    Originally Posted by rosebud had it on a rolling road dipshit 140bhp

    hahahahahaha lower that figure by about 20-25 and i might believe you.
14. mark_saxo Frequent Poster Joined: May 2005 Posts: 839

    #14 5th September 2006, 22:58

    i agree with sean
15. bullit Saxperience Hardcore! Joined: Dec 2005 e-hollywood Posts: 17160 toyata hilux

    #15 5th September 2006, 23:16

    i wondered whod say that first
16. rosebud Newbie Joined: Nov 2005 stoke Posts: 24

    #16 7th September 2006, 07:26

    it was 136.sumit to tell the whole truth.
17. Ratty Established Member Joined: Jun 2003 United Kingdom (England) Posts: 1682

    #17 7th September 2006, 09:45

    what was the wheel fig as the flywheel guestimate is rubbish
18. DAZ1985 Frequent Poster Joined: Jan 2006 Stoke on Trent United Kingdom (England) Posts: 700

    #18 7th September 2006, 17:54

    Quote:

    Originally Posted by CampDavid No idea what affect camshafts have on an engine then? Performance cam = torque band moves further up rev range

    
    My mistake just read original post again i must have over looked the word cams
    
    Sorry my fault