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Thread: Time for a bigger compressor again

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

    Trim : very

    Engine : Z19DTH

    Year : Nosey

    Default Time for a bigger compressor again

    Having spent time with Teapot and having continued to tweek, I now have a map that spools my hybrid to full pressure by about 2250rpm in fourth without the methanol now. So much more is available that I have had to limit torque in the map because it now slips the clutch around 2000-2500rpm without the methanol too.

    So as I am having to hold it back, I might as well go to a bigger compressor again and get even more top end.

    I've attached a graph for the boost pressure holding nice and steady, I didn't go full throttle until near 3000rpm as you can see so I could test of over boost spikes and it played very nicely

    peak was about 29psi, dropping back to sustain 26/27psi, all that is needed for 240+bhp
    Attached Images Attached Images

  2. #2
    Regular Member mrk's Avatar
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    Vehicle : vectra hatchback

    Trim : improving

    Engine : 1.9cdti mas remap

    Year : 06

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    you just love stripping turbos dont you? wish i had your patience and ability to tinker.keep up the good work m8

  3. #3
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    Vehicle : Vectra

    Trim : Design

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    Year : 2005

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    I bet you're really chuffed with that! I'll stick mine on a rolling road next week.

  4. #4
    North West Regional Organiser paulvectrac's Avatar
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    Vehicle : vectra

    Trim : vxr

    Engine : 2.8 v6 turbo

    Year : 2007

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    looks mint that mate well done paul
    Vectra vxr custome remaps egr deletes dpf and diagnostic work all remaps are custome bench tuning avalible all genuine equipment PM for info

  5. #5
    Regular Member STICKY3.2's Avatar
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    Does it go well?

  6. #6
    Regular Member Teapot's Avatar
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    Vehicle : Signum

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    Engine : 1.9 CDTI 150

    Year : 2007

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    Quote Originally Posted by STICKY3.2 View Post
    Does it go well?

    To my bum it felt exceedingly fast, but then I've not been in many quick cars lately ;-)

    Two minds on the job for a day seems to give good results, he just needs to sort out that clutch now!

  7. #7
    Regular Member AntSSSS's Avatar
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    Vehicle : Vectra Estate

    Trim : SRI

    Engine : CDTI 150 (Z19 DTH)

    Year : 2008

    Mileage : 100k

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    Quote Originally Posted by littleteapot View Post
    To my bum it felt exceedingly fast, but then I've not been in many quick cars lately ;-)

    Two minds on the job for a day seems to give good results, he just needs to sort out that clutch now!
    Teapottune strikes again - nice one @littleteapot Paul...

    How did you get on with the PCR values - anything changed from the map we did?

  8. #8
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

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    It is much better low down, the methanol is not needed at the moment as I say. I have continued to adjust the torque request and VNT duty along with injection timming to produce the produce I have now. It is a great shame that the clutch is holding me down to about 370lbft at the road wheel but I can still progress by mapping in the MAF when it turns up and then fitting a higher flow unit to raise the boost to 29psi and push up the top end before fitting the uprated injectors.

  9. #9
    Regular Member AntSSSS's Avatar
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    Vehicle : Vectra Estate

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    Quote Originally Posted by nutron View Post
    It is much better low down, the methanol is not needed at the moment as I say. I have continued to adjust the torque request and VNT duty along with injection timming to produce the produce I have now. It is a great shame that the clutch is holding me down to about 370lbft at the road wheel but I can still progress by mapping in the MAF when it turns up and then fitting a higher flow unit to raise the boost to 29psi and push up the top end before fitting the uprated injectors.
    Do you get a boost spike Karl when you apply WOT from a low rev range to red line?

    I know Paul did a lot of work on the PCRguv values for mine to hold the boost - and it holds really well now (I am standard turbo however)...

  10. #10
    Regular Member Teapot's Avatar
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    Year : 2007

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    Quote Originally Posted by AntSSSS View Post
    Do you get a boost spike Karl when you apply WOT from a low rev range to red line?

    I know Paul did a lot of work on the PCRguv values for mine to hold the boost - and it holds really well now (I am standard turbo however)...
    we didn't make any more changes to the pcr governor, just the vnt duty cycle maps. there were some spikes but Karl managed to stop these by adjusting the vnt duty. didn't try any full throttle from very low revs as thats not something that happens in normal driving. its still on my to-do list though!

    The main thing in this case was to get a high enough iq to spin up the modified turbo at low revs. we ended up with a peak IQ of 120mm3 per stroke after finding the last limiter which was holding it back to 100mm3. Now there's no need for methanol as the diesel alone provides enough fuel to get good spoolup
    Last edited by Teapot; 25th February 2013 at 21:57.

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