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Thread: Erratic boost on my latest turbo

  1. #1
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

    Default Erratic boost on my latest turbo

    I have been having difficulty with my current turbo suffering overboost spikes then dropping off dramatically before gradually climbing back towards the target boost. Having cleaned and checked multiple sensors I decided it must be the VNT duty in the map not being compatible with this turbo.

    After some head scratching about how best to approach this, as remote remapping of the VNT would take forever sending maps back and forth and really the duty needed to be setup on the road while driving. To achieve this I dragged the MF2 fuel solenoid controller from my water methanol kit out, coupled it with a pneumatic valve from my Apexi boost controller that lay in the garage and slapped together quickly a VNT controller using boost and rpm feeds.

    The mapping took about five hours and a quarter of a tank of fuel with two people, one driving, the other adjusting the potentiometer for the 500rpm intervals. The results were excellent, hitting peak earlierand holding at that level right upto the red line. So now I have proved the turbo is spot on and the fueling is not an issue but I need to try to translate the output of the controller into something that could be applied in the map.

  2. #2
    North West Regional Organiser paulvectrac's Avatar
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    Vehicle : vectra

    Trim : vxr

    Engine : 2.8 v6 turbo

    Year : 2007

    Default

    Hmmm interesting that Carl i have sold my siggy and got a 08 plate cdti 150 last time I spoke tobyoubibsaid inwas gonna get another derv lol this weekend jobs is boost gauge where have you tapped in forthr boost feed mate pipe after the inlet ?
    Vectra vxr custome remaps egr deletes dpf and diagnostic work all remaps are custome bench tuning avalible all genuine equipment PM for info

  3. #3
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

    Default

    So, I have fitted my MF2 in conjunction with ECU control to fine tune the map rather than trying to control it completely. I also re introduced the water/methanol slightly lower in the rev range though cautiously as I only have pressure control due to my MF2 trimming VNT, so no RPM safety locks. The result though have been the fastest spool I have ever seen on this turbo unit. I am hitting higher boost at 2000 and peaking at 2.1bar before 2500rpm. This is ideal as I would expect peak boost at 2500rpm if the boost it maxed by then. The power is up significantly too due to the turbine trim (not as high as the 228 wheel power I had on a larger wheel).

    The down side it I think the clutch is unhappy again. I have already fitted an uprated clutch from Black Diamond and after bedding in, it was holding 380lbft in 4th gear on RS Tuning's rollers. That would mean more torque in the higher gears on the road but I was having no issues at all. So I shall have to drag the car back to the rollers to see how much it is putting down and ring around clutch places but they all poo in their pants if you ask for a clutch to take silly amounts of torque.

  4. #4
    Admin plasma's Avatar
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    Vehicle : Vectra

    Trim : SRi

    Engine : 150

    Year : 05

    Mileage : 74000

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    keeps the updates coming Karl
    Plasma's Tech2 services are now partially open and able to provide services



    Come Join our new forum Insignia Owners.com for all your Insignia chat and needs

  5. #5
    Regular Member john norris's Avatar
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    it dosnt seem like theres enough surface area for the clutch to grip hold im sure theres something like a multi plate clutch that can handle high torque perhaps it was on the golf gttdi if I remember correctly I dont know if you could adapt something like that

  6. #6
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    Multi plate and conical clutches take up more room, so it would require alot of modification.

  7. #7
    Regular Member john norris's Avatar
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    bell house extension and one longer and one shorter drive shaft and then whatever system inside you chose sounds easy lol well if you have the cash to get it made up

    still with all the power your generating I think the only way your not going to eat clutches and lose power through slipping is with bigger surface area on the clutch

    Im guessing if you put any more pressure on the friction material than you are now with that sort of power your going to rip up the disc and turn it in to powder, also is it only that bit of slip that's stoping your gear box from exploding?

    could you fit a larger radius disc in the bell housing ?

    just thinking that vauxhall use the same engine in some of there vans, do they have a bigger disc to deal with the extra weight of a load? might it fit?

  8. #8
    Regular Member john norris's Avatar
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    380lbft = 514.63 nm on a box rated at 400nm your a brave man

  9. #9
    Regular Member Ziggy's Avatar
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    Vehicle : Saab

    Trim : 9-3 Vert

    Engine : 2.0

    Year : 2000

    Default

    Quote Originally Posted by john norris View Post
    380lbft = 514.63 nm on a box rated at 400nm your a brave man
    Spoons and a number of other VXR owners run more with out issue

  10. #10
    Regular Member john norris's Avatar
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    does the VXR run an f40 gear box?

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