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  1. T

    What strategy for hdj100 4.2

    I have the first generation turbo (not the variable vane one).
  2. T

    What strategy for hdj100 4.2

    I have owned my 4.2 ‘98 hdj 100 for about 12 years. It has 180 000 miles and is religiously maintained. I plan on keeping it as long as possible. I am trying to slighty improve performance and also extend reliability. Car is based in France. I am concerned the turbo is getting a bit long in...
  3. T

    HDJ 100 4.2 TD upgrade ?

    Ok thank you. I think that is it: new dump pipe and unichip. That will give me the target torque improvement. Will report when I am done
  4. T

    HDJ 100 4.2 TD upgrade ?

    Perhaps there is a different spec in australia bit in europe, the catalyst is in the downpipe. One of the popular mod is to replace with a downpipe that doest (so called african spec in france)
  5. T

    HDJ 100 4.2 TD upgrade ?

    Really the dump pipe isn’t restrictive ? It’s oem with the catalyst in it. I was thinking bigger and switching to hi flow catalyst. That alone should make an difference. My current view is that dump pipe plus unichip plug and play. If someone feels I am making a mistake, please let me know !
  6. T

    HDJ 100 4.2 TD upgrade ?

    Ok thank you I think for now I will focus on the downpipe and center exhaust. At least one can’t go wrong with that.
  7. T

    HDJ 100 4.2 TD upgrade ?

    Ok understood. So I could just change the spring of the wategate to move the turbo boost a bit and unichip will reduce fueling if the temps get out of hand. What is the safe boost level for a stock CT 26B ? I think I read the stock is 11-12 psi. So stiffer spring to boost to 15-16 psi should be...
  8. T

    HDJ 100 4.2 TD upgrade ?

    Thank you for the feedback The downpipe is definitvely on the list Any thought about the standard program for the unichip ? Does unichip control the boost of the turbo or not ?
  9. T

    HDJ 100 4.2 TD upgrade ?

    Thank you. I recently changed the back end the exhaust which was corroded around muffler. New part is oem. Would focusing on the downpipe and center part be an option ? I also really want to retain catalysts to ensure I remain compliant (egr was binned a few years ago)
  10. T

    HDJ 100 4.2 TD upgrade ?

    My objectives are: - 20-30% increase in torque esp low rpm - best reliability bearing in mind the car is a 98 and has 165k miles on it. While I maintain it seriously, it’s not brand new - budget is gbp 1.5-2k For that budget I guess I could do the downpipe and unichip. But I can’t find and...
  11. T

    HDJ 100 4.2 TD upgrade ?

    I am a ling term owner of my HDJ100 4.2 TD and have been toying with the idea of a mild improvement for a number of years. Lockdown fever has given me some time to consider options and look at the facts. I am not an automotive engineer and would like to get input from ‘those in the know’ 1) How...
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