Rather than ask opinions and get every answer I thought it is more appropriate to see what the actual stats are when it comes to deleting items and see where it all lands. Would you delete the following or not?
All these deletes have been well documented in the past, listing their advantages and disadvantages. Do a search and you will find all the information you need plus more. I will say though, there's a reason so many people do the deletes.
I am deleting/deleted everything on that list cept the hicas and the exhaust bits. http://s95014253.onlinehome.us/63104/index.html has a run down on some of those deletes and the pros and cons and long term analysis. My primary reason for most of the deletes ? Less things to get boost/vacuum leaks from and the underplenum rats nest coolant leak preventation.
the cat sensor and the egr was already done I have done the under plenum and aiv and am looking into hicas as well. the las is mainly as I am cleaning up the engine bay and not sure if I want the hicas in there. Also the inner ends of the hicas tie rods are stuffed on my car.
Stats are interesting already These stats are interesting already - 50/50 on the hicas so far and 100% under plenum bypass
Ive had everything deleted except for HICAS (mine's NA) and the exhaust sensors...whats the benefit of deleting the exhaust sensors? Ive never heard of anybody doing that... Abraham
Comes from when you install a new exhaust and there is no ports for the sensors except 02 - the decision is made to either put in ports or delete the exhaust sensors - I dont think there is any benefit except for saving time and $ by not putting in the extra new ports.
Hicas In my opinion the Hicas delete is more a personal preference thing, from all accounts though it can be quite scary when it goes wrong. I'm not saying that it will go wrong just that it could, it is after all a 20 year old system that has more than likely had no maintainance done on it!. If you do the delete, remember that it is a part of the vehicles steering system and treat it accordingly!, use quality parts!. I say this because you don't want it to fail. Hope this helps, Andy
The stats are telling the story - thanks all Yeh - I was wondering whether it would get about 90+% for the under plenum but 100% surprises me and pretty much confirms that it is absolutely useless unless you live on the russian front. Besides you get extra water cooling pressure to the turbos from deleting that birdsnest of pipes not to mention the less that can go wrong under there. If your drifting or racing then the hicas is normally deleted but for a normal street/ touring car you just cannot replace those counter forces from the 4ws with anything else when your high speed maneouvering. I always thought it was even in opinion but the stats are now tipping towards keeping hicas it would appear. I dont believe maintenance is a real factor to delete given the whole car is twenty years old and requires maintenance all round, to own a Z, you have to appreciate that and accept it as part of the love that goes with owning one anyway like any other part. EGR/ AIV's depends on whether you want economy and better starting or extra carbon and gunk to deal with, I think it will take more votes before we see a steady result on for those on whether to delete or not , but I am really surprised so far that the delete for them is so high and dominant! Thank everyone for voting - the stats tell the real story at the end of the day on whether it is better to delete or not, as compared to the vastly different opinions that often conflict in the threads - where people are asking whether to delete or not.
yep - they have no correlation to the ECU input engine adjustment factors as such. The EGR is almost a 100% delete - that is so surprising! Cheers
You ever pulled off an old EGR system? Pipes are that full of crud that there is no chance it hell that it operates anymore. Delete- less vacuum lines to EGR solenoid, valve and pipes to plenum underside. - makes it a lot easier to remove and refit plenum Cat temp sensors- unless youre fitting an aftermarket exhaust, no real need to get rid of them, unless your car is substantially lowered. If they cop a hit, it tears the outer sheathing, causing intermittant illumination of the warning light. AIV's and PRVR- delete em Plenum hoses- surprised youre even asking, even more so that you havent done them already. HICAS- if its working, and you arent on a mission to de-clutter your engine bay, leave it.
My EGR is still working fine?? less vacuum lines means nothing unless your too lazy to do a boost leak test - lol AIV/ PVR - your 70% right based on the stats Plenum hoses - I actually have deleted them - 100% have deleted as well in stats, so I would be more surprised if anyone does have them still (possibly a sign that servicing hasnt been according to plan - injectors/ 200k etc?) I think your about right on everything else said and its certainly easier to refit plenum Cheers
remove the lot, remeber on most cars all these systems are 20+ years old! some are obselete, some are pointless, some are dangerous and they are ALL a liability engine bay looks SO much better minus all that crud as well.....
