Page 1 of 4 1234 LastLast
Results 1 to 10 of 38

Thread: Been to Velos, and the results are.....

  
  1. #1
    Status
    Offline
    mantamagic's Avatar
    AOC Fanatic
    Join Date
    Jun 2003
    Posts
    817
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)

    Been to Velos, and the results are.....

    Took my car down to Velos this morning, to run it up on the rollers.

    Wanted to test various changes, to see which gave the best power.

    1st Spec (was same as at Northampton Motorsport)
    which includes :- Manual Boost Controller, K&N 57i & Ecotek Valve.

    Gave out 188 bhp and 204 lb/ft which compares to Northampton @ 185.6 and 203.

    2nd Spec
    Same as above, but K&N57i replaced with de-restricted airbox and Ramair Panel Filter.

    Gave out 184 bhp and 197 lb/ft.

    3rd Spec

    Same as above, but manual boost controller removed and std boost control solenoid re-installed

    Gave out 192 bhp and 199 lb/ft.

    4th Spec

    As above, but actuator setting changed so at far end (strong setting).

    Gave out 202 bhp and 230 lb/ft. (ran up twice and got same figures)

    For the first time, we got the turbo glowing!

    Due to the above results, I have now put the cone back on.

    Velos rollers are'nt that bad, and have been calibrated recently.

    Fan was positioned centrally so to give sufficient airflow to the intake and intercooler.

    Used the plug disconnection method to disable traction control.

    Cost me £40, for almost 1hr 30mins time (gave them an extra fiver as they were very helpful).

    They printed me out a nice graph as well with the final figures which were 202bhp (162@wheels) @ 5505 rpm

    Interesting that on std airbox, it is a final blip near the rev limit which gives the highest bhp figure.

    With the cone the power is more constant and does not drop off.

    They also showed me the power graph of a 1.6 Corsa with Unichip and throttle intake, 145bhp!

  2. #2
    Status
    Offline
    Manch's Avatar
    AOC Obsessed
    Join Date
    Dec 2003
    Posts
    1,404
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Cool, which way did you turn the acutator and how many turns?

  3. #3
    Status
    Offline
    mantamagic's Avatar
    AOC Fanatic
    Join Date
    Jun 2003
    Posts
    817
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    The actuator as std is set about the middle of it's range.

    To hold boost slightly better, you can wind the nut's up towards the actuator body (towards the centre of the engine). This is effectively the strong setting. Allowing higher boost before the wastegate open's.

  4. #4
    Status
    Offline
    LordNikon's Avatar
    AOC Gold Member
    Join Date
    Jun 2003
    Posts
    18,952
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    My actuator is virtually wound to the bottom of it's range. And it makes absolutely feck all difference. The adjustment bar at the bottom only compensates for a weakend diaphram, and therefore allowing it to last longer. Unless your actuator is older, then this wont make squat all difference.

    Mantas is obviously weakened over time, and winding his up allowed higher peak boost, but it will not hold the pressure. The diaphram will still bleed pressure once the peak has been reached.

  5. #5
    Status
    Offline
    Manch's Avatar
    AOC Obsessed
    Join Date
    Dec 2003
    Posts
    1,404
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Just interested as it maybe make difference to someone with a old/weak actuator. It will also have a a good effect on spool up , as it may reduce wategate creep .

  6. #6
    Status
    Offline
    mantamagic's Avatar
    AOC Fanatic
    Join Date
    Jun 2003
    Posts
    817
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    I have played around with the actuator a fair bit, and it does make a difference adjusting it.

    When I had the boost controller installed, it boosted too high due to the cold weather. As a quick fix, I wound the actuator to the bottom of it's range so that it responded quicker and reduced the boost level slightly.

    Earlier today, all but the last power run was done with the actuator set like this.

    I go 192bhp with the actuator at the bottom of the range (which is what I call the weak setting as it needs less pressure before opening the wastegate). The max boost at this setting was about 9psi.

    With the actuator adjusted to the other end (which I call the strong setting, as It does not open so soon allowing slightly higher boost), I got 202bhp and more torque (due to higher boost at up to 12psi). The turbo also glowed red hot!

    My car has only done 20,000 miles, which ain't a lot really.

    Pete's car is set at a similar level at the top of the range. This is possibly because his bigger turbo need's to generate a higher level of boost before the wastegate opens as if it opens too soon the max potential boost level would not be reached.

    Max boost level at the end of the day is dictated by a number of things including the following :-

    How much boost the turbo can generate.

    What psi the actuator is rated at before it opens.

    How much air can be bled off to stop the actuator opening too soon.

  7. #7
    Status
    Offline
    leeGSI's Avatar
    AOC Regular
    Join Date
    Sep 2003
    Posts
    284
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Where abouts is the actuator on the Z20LET?

    On the subject of the cone filter, ive been driving a standard Zafira GSI this week and the difference between mine when out on the road is really quite big ( i run a cone filter). The car pulls so much better with the Cone on. How do you find yours Mantamagic?
    Supercharged 330 coupe
    Golf V6 4motion
    Astra VXR

  8. #8
    Status
    Offline
    mantamagic's Avatar
    AOC Fanatic
    Join Date
    Jun 2003
    Posts
    817
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Pull's fine with it on.

    After the rolling road session today, I saw for myself how the airbox can restrict power and torque further up the rev range.

    I'm sticking with the cone, until I get something like the CDA!

  9. #9
    Status
    Offline
    MatG's Avatar
    Club Chairman
    Join Date
    May 2003
    Posts
    34,568
    Mentioned in
    1 Post(s)
    Quoted
    1 Post(s)

    Re: Been to Velos, and the results are.....

    Quote Originally Posted by mantamagic
    Took my car down to Velos this morning, to run it up on the rollers.

    Wanted to test various changes, to see which gave the best power.

    1st Spec (was same as at Northampton Motorsport)
    which includes :- Manual Boost Controller, K&N 57i & Ecotek Valve.

    Gave out 188 bhp and 204 lb/ft which compares to Northampton @ 185.6 and 203.
    fair to say that Northampton Motorsport rollers were fine than and was actually the car giving a low figure. Glad you got to the bottom of it though
    Been apart of the inner circle since 2001
    Click Me to Join Astra Owners Club Full or Lite Members

  10. #10
    Status
    Offline
    LordNikon's Avatar
    AOC Gold Member
    Join Date
    Jun 2003
    Posts
    18,952
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Petes phase 3 turbo is the original turbo with new vanes and bearings, thats the regals phase 3 conversion. IT is still the KKK04, with new internals. Petes car has just had its first MOT so must be 3years old minimum. I would hazard a guess his actuator is wound right up due to the diaphram being weakened over time.

    Yes the actuator can be used to gain small amounts of boost, but this isn't the best way to do it.

Page 1 of 4 1234 LastLast

Similar Threads

  1. Opinions of Velos Motorsport..?
    By mantamagic in forum Astra Discussion & Chat
    Replies: 30
    Last Post: 02-03-2004, 00:33
  2. velos torq tube
    By big sxi in forum NA Engines (Non-turbo petrol) inc. Transmissions
    Replies: 7
    Last Post: 01-02-2004, 23:56

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •