Warren G
Member
Registered: 14th May 06
Location: Kent
User status: Offline
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Astra G vxr turbo cooling kit
One brand new VXR turbo
before used to go flat 5k, now just pulls to limiter! feels more laggy mind, doesnt come on boost fully until 3k,
might wind the actuator back up see if it brings in more boost to better pick up, but pulls alot smoother harder for longer 
turbo owe me £150 profit, as sold my old turbo already  
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Spanishfly
Member
Registered: 2nd Jul 08
Location: London
User status: Offline
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Nice one matey On the standard map with the VXR turbo I found the flat spot at 2400-3000 worse than with the standard turbo. However with a map it shouldn't have said problem!
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Chris C
Member
Registered: 2nd Jan 05
Location: Hemel Hempstead
User status: Offline
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Nice one
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Warren G
Member
Registered: 14th May 06
Location: Kent
User status: Offline
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on the stage one for standard turbo, had a flat spot at 5k where it dips in power
with the correct vxr turbo map, thats gone, and im proved pick up slighty too
but i think i need to wind actuator back up, as before it used to slip the clutch and would spin the wheels easier coming on boost - need a boost gauge it set it up tbh
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DaveyLC
Member
Registered: 8th Oct 08
Location: Berkshire
User status: Offline
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Warren, you shouldnt fuck with the actuator on electronic boost controlled cars! The boost solenoid cuts the pressure to teh actuator, if you tighten it up you'll confuse the fuck out of the ECU.
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ajscorsa
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Registered: 30th Apr 02
Location: Perceton, North Ayrshire
User status: Offline
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quote:
Originally posted by DaveyLC
Warren, you shouldnt fuck with the actuator on electronic boost controlled cars! The boost solenoid cuts the pressure to teh actuator, if you tighten it up you'll confuse the fuck out of the ECU.
what he said, my mate done it on his ibiza and it cut boost to like 8psi and thats on a car that should be running 15psi, put the car into a kinda limp mode
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DaveyLC
Member
Registered: 8th Oct 08
Location: Berkshire
User status: Offline
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The solenoid pulses to control the boost going to the actuator so it doesnt matter if its limp or tight the ECU will monitor boost via the MAP sensor and control the boost, if you over tighten the actuator the ECU can no longer control the boost smoothly and you'll get nasty spikes and mushroom pistons!
[Edited on 25-03-2010 by DaveyLC]
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Spanishfly
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Registered: 2nd Jul 08
Location: London
User status: Offline
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So how do you control over boost then if you don't adjust the actuator? If the actuator doesn't have any resistance it will open too early. You need to adjust it to within the parameters of the map, however NOT over them!
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Spanishfly
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Registered: 2nd Jul 08
Location: London
User status: Offline
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Sorry let me start again. ECU controls overboost actuator controls held boost stays. So if it's tailing off top end the actuator is weak.
[Edited on 25-03-2010 by Spanishfly]
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Spanishfly
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Registered: 2nd Jul 08
Location: London
User status: Offline
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Oh and on mine I was OB to around 17 psi and holding 12-13 now i'm more like 20 OB and 17 held, still needs adjusting slighly more. Should be 21/23 OB (depending where you read it from) and 18/20 held.
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DaveyLC
Member
Registered: 8th Oct 08
Location: Berkshire
User status: Offline
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You dont really want overboost and spikes which are created by having a tight actuator because the ECU isnt going to compensate enough with fuel/timing.
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.dean.
Member
Registered: 21st Sep 07
Location: Hindley, Wigan Drives: Like Its Stolen!
User status: Offline
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whats the thin pipe go to next to the boost pipe on the right?
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Warren G
Member
Registered: 14th May 06
Location: Kent
User status: Offline
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what i meant was i need boost gaugue to set up the actuator properly, i dont think its running full boost that the map is set too
still have simular problem as before, power doesnt seem to be constant, sometimes its fooking rapid, others feels like its holding back
going to remove the rear bcs and vac box next!
was quite surgy tonight, though i had to put 95 in it :s
stupid turbo's
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gavin18787
Premium Member
Registered: 22nd Feb 05
Location: Basildon, Essex
User status: Offline
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Looks like its moving along fast now
Did you get a good deal on the vxr one?
Drives supercharged Tec with torque 
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Nic Barnes
Member
Registered: 5th Apr 04
Location: nowhere near ginger people
User status: Offline
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quote:
Originally posted by DaveyLC
You dont really want overboost and spikes which are created by having a tight actuator because the ECU isnt going to compensate enough with fuel/timing.
they come standard with overboost then a held level of boost.
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Warren G
Member
Registered: 14th May 06
Location: Kent
User status: Offline
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quote:
Originally posted by gavin18787
Looks like its moving along fast now
Did you get a good deal on the vxr one?
free 
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Spanishfly
Member
Registered: 2nd Jul 08
Location: London
User status: Offline
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Exactly Nic
Warren lose the rear BCS, I did and it is alot better on boost
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Warren G
Member
Registered: 14th May 06
Location: Kent
User status: Offline
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mines abit strange, some times to comes on boost realy hard, some times not
so far i have tried and replaced, afm, front bcs (new one on turbo anyway) pressure tested boost system,
need to get a boost gauge!
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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boost solenoids? Or whatever they where called
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Ojc
Member
Registered: 14th Nov 00
Location: Reading: Drives : Clio 197
User status: Offline
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BCS Jimbo
Astra has two.
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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I couldnt remember what they where called 
I replaced both, mine was much healthier afterwards.
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Ojc
Member
Registered: 14th Nov 00
Location: Reading: Drives : Clio 197
User status: Offline
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Yeah I think Fad replaced both of them on Rachels old GSi, would explain why it felt like it was holding back when I drove it.
The things are useless, always going.
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Chris
Premium Member
Registered: 21st Sep 99
User status: Offline
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whats your 80-100 time now?
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FlamingCorsa
Member
Registered: 22nd Apr 03
Location: Shropshire
User status: Offline
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mate of mine had stage 3 astra gsi with vxr turbo etc, adjusted the acuator a little and bang these goes the engine!
i had my mapped and set up at courney, yea its expencive but have piece of mind. they do a health check on it first and sort any issues before any mapping and boosts excatly the same everytime u go out in it! and this is almost 18months after having it done!
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Spanishfly
Member
Registered: 2nd Jul 08
Location: London
User status: Offline
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His engine went bang due to winding his boost up? Forgive me for sounding arogant, that didn't happen!
As has been said the ECU will knock the boost back/timing etc.
What may have happened is he used a dawes device or bleed valve, wound in too much boost and it went bang.
These maps are built with differences in, most of them overfuel to make it safe, so an extra 2 psi won't kill it.
On my old cLET I used to run 30psi in 5th and 6th as I had copied chips that didn't seem to have any problem with it. They were 'EDS phase2' meant to be set at 21psi iirc. I killed K16's monthly. lol
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