Egr deactivation- ok guy see if im on the right track here. After a lot of reading up on the subject ive come to a fewconclusions. I got my info from the site below. http://www.twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=967920&forum=technical&dtSearch=0 From the fact that some people completely remove there egr removing it doesn't cause a problems with the running of the car but does cause a computer code error. On na 300zx's there is never enough pressure in the exhaust to force the egr open if the vacuum line to the egr is disconnected. But! On turbo model, possibly only when running more than factory boost there can be a situation where at full boost the egr could be forced open causing exhaust gas to enter the engine- very bad. Now what im planing to do is run a line from the balance tube to the top of the egr with a simple one way valve so that the egr valve only ever gets boost (aiding in keeping the spring in the egr closed) and never vacuum so it will never open again. Now my reason for doing this... if the valve isn't opening and closing then its not going to wear out and fail, one less thing to go wrong. Really don't want pull out the egr valve if i dont have to. And my 2nd reason is to simplify the engine bay. This removes the solenoid and cuts the vacuum/boost hoses down from 3 to 1. would be interest what the experienced members had to say about my idea
yip thats what i will do when the plenum needs done, do ya think what ive described sounds correct tho? also what resistor is required to avoid the error code? i havint seen any thing describing it in any of the egr valve removals
Use a multimeter and measure the resistance of the solenoid. Put it across the terminals where it connects up. (I'm assuming there's a connection somewhere haha, I haven't touched my EGR yet)
I've removed the egr completely including the solenoid and there is no error code reported. Then again I've only driven it today since doing it.
another way I ran the line from the top of the egr to the hardpipe before the throttle body. That way the egr gets atmospheric or boost pressure. But I think sometimes maybe still gets vaccuum when the throttle is opened after being closed and the turbos are winding up. So perhaps your one way valve is a good idea. What valve are you using and where'd you get it from? I have not seen any error codes and dont have resistors jumping the plugs where the egr or aiv solenoids were. 89 TT Jspec ecu maybe doesnt care, or im not seeing the fault codes on ecutalk for some reason.
Californian ECU error codes... The error codes that are mentioned there in the twinturbo.net post is in reference to Californian zeds. On our zeds, if you remove the EGR, you will not get an error code. Cheers
hay, yeti, yer i was wondering if there was a sorce where there was only boost pressure, i found your post of what you had done after i had posted mine, but then were still abit concerned like ya said that there could be a vacuum before the turbo wound up. the one way valve i found cost like $3 including postage, good to know that im on the right track
havint done the removal yet was finding out what people thoght before i did it, here are a couple of ebay people selling the one way valves http://cgi.ebay.com.au/Check-Valve-...ryZ46312QQssPageNameZWDVWQQrdZ1QQcmdZViewItem or another option is http://cgi.ebay.com.au/Air-Check-or...sPageNameZWD1VQQcmdZViewItem#ebayphotohosting
http://www.twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=347047 Another post by Ash. He is now suggesting you keep the EGR in place.
yes!! thats what I've been trying to say for ages. More so for NA's that have a higher comp ratio. Cheers
Question is why did Nissan remove it from the later year models??? If the logic behind all that's said makes sense then on what basis did Nissan remove this in the later year Z32's. Is there something else that they replaced it with? Peter
Some people argue the EGR was only installed due to the environmentalists... and that engine temps and NOx production are greater under WOT conditions compared to cruising anyway. Some estimated combustion temps are probably reduced by 5-10% with the EGR in place, 100-200 degrees??? What impact a removed EGR will have on engine life is another matter.... it was proposed some other part of your engine would fail long before any aspects relating to higher combustion temps would cause an issue.... I think at the end of the day its worth leaving in place. I removed mine but I think I will reinstall it... maybe at the 50k mark, I need to replace a coolant line at the back of the plenum anyway. The EGR only kicks in when cruising, it makes no difference to performance if you remove it... Out of interest, I'd like to see EGT before and after EGR removal.
Nissan did delete the egr from later model zeds, not sure what they replaced it with. My 94 had an egr, so i assumed the engine had been replaced at some stage with an eariler model engine, not so! Nissan were still putting egr's in 96 model zeds, you only have to look in a parts list to find that out. Just a quick word on the ebay on way valves, they look to be made from plastic, so i can't see how they would last very long before meltdown.
I agree with geron there must have been a reason nissan dropped the ERG, What would happen if everyone had brought a 99/00 spec car instead of a 89 model would u think they would got o the trouble of adding a EGR if it wasnt installed on those cars. I have no plans to remove my EGR unitl i find out exactly why nissan removed it and i would want to see exactly what is missing from the EGR systems in the later models before anything. Mayb nissan lowered the compression of the NAs in the later models who knows. ill ask around the uk and us and see what i can find out and report back.
Ok guys just got a few replies from the uk bois and they say nissan never dropped the EGR as far as they know, they said the 96 models had them so they probably stayed on till the end.
Egr was deleted from 96 on, along with a heep off other things, from what i can gather. I think they detuned TT engines from 96 on. Aiv was deleted from 94 models,no sign it was ever there on my car.
