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...
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)
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 !
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...
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 ?
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)
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...
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...