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Old 28th April 2014, 14:36   #21
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This is interesting, mine cdti with autobox is loosing boost pressure when shifting in the lower regions.
I am holding my throttle at 25% and the box shifts to the next gear the boost pressure drops to 1.4 psi and there is no power then slowly he climes back to 6.2 psi. with full throttle he produces 17.8 psi.

Does this mod cures this problem? because without the egr valve it run much smoother but I had an engine fault light due to missing egr valve.
I was going to clean the the inlet manifold to see if that's the problem.
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Old 3rd October 2016, 19:09   #22
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Mines been running at 24 PSI for nearly 2 years and 30k miles and it's not exploded yet.
What other mods have you done to keep it running at 24 psi. Have you removed the cat and egr bypass?
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Old 3rd October 2016, 19:42   #23
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What other mods have you done to keep it running at 24 psi. Have you removed the cat and egr bypass?
All the above plus a lot more (custom air intake, 160 map, Synergy etc).
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Old 5th October 2016, 11:28   #24
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All the above plus a lot more (custom air intake, 160 map, Synergy etc).
That's probably why you can run your car at 24psi. I wouldn't advise running a straight car ie no mods at that psi. Make sure on getting a boost gauge fitted, before any boosting,(Which I strongly suggest). As you have no idea what the car is boosting at stock. Also, if you are striving for more power. You will need to upgrade you brakes as well

What BHP did you achieve in getting in the end jakg?
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Old 5th October 2016, 12:04   #25
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got mine running on 24/25psi too.
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Old 5th October 2016, 13:04   #26
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Quote:
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You will need to upgrade you brakes as well
Front 190 calipers, black diamond pads, braided hoses and ATE superblue fluid. I think I've got that covered...
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What BHP did you achieve in getting in the end jakg?
http://www.the75andztclub.co.uk/foru...55#post1181455
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Old 6th October 2016, 15:05   #27
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Front 190 calipers, black diamond pads, braided hoses and ATE superblue fluid. I think I've got that covered...

http://www.the75andztclub.co.uk/foru...55#post1181455

Looks like you have done a great job there Jack, well done mate. Good job on the brake as well
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Old 6th August 2022, 17:15   #28
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Thread for Jeff to have a quick read over.
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