well like i said i bought this car off a guy claiming to be the turbos are still in there just deep underneath as its disconnected at the wastegate, and just need to be reconnected so then it would boost again. My car yes still does drive but lacks speed, now i noticed this car stalled on me 3 times past this week probably good sign the injectors are clogged up could that be my problem. I have no idea about cars dat much. The guy who sold me this car was an old guy in his 60s aussie, seemed like an honest guy, so ill gave him the benifit of the doubt. As i dont know much about cars i just took his word for it. I would of taken pics for you guys but i don't know where to start, i can see the intercoolers are still there both left and right. jeeze some of you guys give me a break here im a newbie
Give him a break, he is a new member wanting help and he doesnt know much about cars. It is more constructive to have him informed and a part of our forum rather than being unconstructive and telling him crap that will not help him fix his car. He has obviously been bullshitted by the person whom sold him the car already so lets not make it worse by being a$$holes to him and instead, help him like like a good reputable forum should. Heres your real info with no BULLSHIT. PCV has nothing to do with excessive fuel consumption. You cannot "disconnect" a turbo from the waste gate. The guy lied to you. Its seriously that simple (remember I am trying to help) Disconnecting (would have to be removing) the turbos makes it use more fuel not less. (Any forced induction means less fuel to make better power) If you are worries about fuel consumption I would be looking for . . . - Boost leaks in the turbo system. (as well as "RECONNECTING" the turbos) - Fuel system (fuel pump / reg / rail / injectors / etc) - Clean all connectors (not really relevant but do it anyway) - Tune properly with a laptop program compatable with nissan ECUs - Check that the MAF is not faulty (a common but overlooked problem for excessive fuel consumption) If it is actually over-fueling then your CATS will overheat and the CAT light will come on in the cockpit. If it is not overheating the CATS and actually using excessive fuel . . . then this is because the turbos are "disconnected" stopping the engine from working as efficiently as it could. A turbo car has less compression to deal with the added pressure that forced induction gives. This then creates a "high compression" system via the amount of PSI provided because the air charge is "compressed" by the turbos before being introduced to the cylinders. A turbo system will create more power using less fuel (more bang per buck) via this system. Some forced induction cars actually make almost 50% more power and 40% better efficiency by doing this (these are the high end range of the numbers, best case scenario). Do a little research on forced induction or "how turbos work" to find a more detailed description that explains it better than I have. After "reconnecting" the turbos and making sure everything else is working fine report back to us so we can help some more incase the problem does persist. However I think you will find that reconnecting the turbos and making sure there are no boost leaks in the turbo system will probably solve the problem. Peace
Sooo... I'm assuming the previous owner wired the wastegates open. That would explain a lot. Your car is tuned to run with the turbos functioning. Not having them boost is not only robbing you of power, but destroying fuel efficiency as the ECU isn't putting the right amount of fuel in for the power you need. It's likely running hyper-rich. Undo-the garbage that the previous owner did by connecting the wastegates back to the wastegate actuators and ensuring they still function. It would help us if you could also take a few clear photos from under the car of the turbine housings/wastegate actuators. Given you're a bit of a newbie, I'd probably send your car to a mechanic to make sure it gets done properly.
Members close by Are there any members close by to go and have a look for him, The poor bugger needs some help because he has definately been BS'ed to, or even someone he can take the car to. In my last post I was'nt trying to flame or anything, just trying to get my head around why someone would disconect turbo's . Andy
Yea if he was near Geelong I would have already PMed him to just bring it to O'Connor "zed shed" so we could fix it up while showing him how its done. Unfortunately he is in New South but that doesnt mean we cant find another reason to have a tech day. . . . . lol . . . . Every day is a tech day at the Zed Shed. I am going back in today to replace my lower plenum because some knobhead thinks its funny to sell people faulty parts as good parts :bash: (Not O'Connor . . A guy interstate from me. Zed Shed RULEZ) Come on in any time ya want TWIN TERROR, we are always there playing with various Zeds. You can come in and use the shed tools and we will help where applicable if you want to do the work yourself OR people whom could not be bothered doing the work or do not want to learn can just pay us to do the work for them. People always drop in to tinker with their Zeds while we all talk crap and have fun. ------------------------------------------------------------------------------------------------------ Just to explain what I meant earlier . . . . Disconnecting the wastegates creates a HUGE boost leak not allowing the turbos to ever boost. This creates a low compression motor running about 8.5/1 at best whereas under normal conditions the compression ratio would be much higher (about 11/1 under stock boost I think) Therefor this means that the turbos are not "disconnected" they are just restricted from ever reaching boost because they cannot hold pressure. Lower compression means that the air/fuel charge never gets compressed enough in the cylinder because of the low compression ratio of a turbo motor without boost. With the turbos disabled, all you have is an NA motor with VERY poor compression. ------------------------------------------------------------------------------------------------------ Peace
hey guys thanks finally for giving me the real support now after reading your replys much appreciated thanks you guys. Alright so maybe i have been screwed over by the old guy but i still have his address and all that. Anyone here in nsw could help me fix this petrol problem as its not funny, i just poured a full tank of mobil 8000 high octane which cost me about $108 today, man petrol companys are evil. Since this car stalled on me 3 times this week, i thought the fuel injectors might of been the coupurlt. Dirty so i bought nulon total fuel sytem cleaner and threw in in the tank as well. Ok i drove it home from liverpool to hurstville and it almost ate up a quater of tank. And now i don't think its the fuel injectors. I dont smell any fuel leaks at all or where to even look for the fuel lines or vacume lines as im a noob at this scene. Problem is down in my area no mechanic wants to touch a 300zx its a mechanics nightmare. Anyone down in NSW could give me a helping hand and ill happily pay you, as like its so expensive to drive this car as for some magic reason its so thirsty. And for an auto twin turbo model with the turbos disconnected it revs too hard when i give it it revs up to 6 revs before into changing into the next gear. Where as my turbo 300zx only needs like 2 and a half revs to hit next gear. So whats wrong there. Ive also heared if your wheels are not aligned properly, it also waste more petrol im assuming this car has alot of problem the guy left out. So do i just get the turbo connected back on and that could fix my petrol problem. Is it a big job, as i know you got to take out the motor to get to the wastegates. Well if there is someone who can help a poor guy like me plz stand up.
Just reconnecting the wastegates may not solve your problem. After all, the seller may have wired them open to mask another problem, like faulty wastegate actuators or severe on-boost issues. Go to a reputable Z workshop, like UAS. Don't entrust your car with any regular mechanic, they'll likely bugger it up even more.
Public appology from me. From your fist post most of us thought you were winding us up (known as "trolling" on internet forums).
How is a lower plenum faulty? It's a hunk of ally with some holes in it... I know what you mean, but that is a bad way of explaining it. Turbo engines are lower compression that NA to reduce the chance of pre ignition. High compression gets high temperature (i.e. how a diesel works). When you compress air it get's hotter (turbo, in the cylinder, whatever), no way around that, hot air in the cylinder with fuel getting compressed even more and it is more likely to go bang when you don't want it to. It ignites due to heat rather than spark, so you have no control over ignition timing, which is the same as running a HEAP of ignition advance. Which is bad. Another problem with high compression high boost engines is combustion temperatures, it gets friggen hot and will melt pistons. Back to what we were talking about... It's unlikely to be your fuel injectors themselves. Could be a leaky fuel injector o-ring. Is it hard to start after it has been sitting for some time? As for your gearchanges, sounds like your TPS is way off. Adjust it to 0.44v-0.46V and that should improve a lot. Reconnecting turbo's may be a interesting one depending on how they have been disconnected. If the wastegates have just been wired open then you will have to reconnect the actuator arms and check all the vacuum lines to make sure they are going in the right places. You don't have to remove the motor to fiddle with the actuators, but I wouldn't want to have to remove them in the car. The turbo's may have been disconnected on the compressor side, with some sort of funky plumbing bits, so the compressors are just bypassed. Have a look and tell us. Take lots of pictures and put them up. Help us help you. I would recommend taking it to a mechanics like UAS or MRC, both are experienced with Zeds. The bill might be larger than the car cost to buy though.
Thanks again you guys thanks for the help and detailed info and yes apology accepted u game. Well i spoke to the guy said the turbos are still in there but just been disconnected at the wastegate, gotta dig deep down to reconnect em. I don't know for an old guy hes just giving me a run around. I dont really want to argue with this guy because i have before and never won, you know old ppl are. So wow looks like there may be like 50 problems with this car but the main thing i want to fix is the fuel problem. The power steering on this is heavy as well he lied to me saying all i needed was to fill up the power steering fluid and i did when i got hme and didnt do nothing. Its like driving around a heavy brick this car When opening the drivers door the light does not turn on, but when opeing the passengers side or boot the light turns on. when driving on uneven bumpy roads the car goes left to right alittle bit, but when driving fast like 100km it get worser it goes harder left to right. I complain to this guy he said its the HICAS system and thats how the car is, total BS said this car is not for the faint hearted. I swear this car almost killed me when i drove it back home on the M5 highway doing that stuff. Well it may be bushes or just need a simply wheel alighment as it really does need one. I took it to get aligned but the guy couldnt do it. since the car has been lowered pretty low he cant put it on his machine thing it will break the bumper. Also on rainy day it seems that water leaks through the targa from both left and right. I don't know it seems this old man screwed me over big time, but end of the day i can't really be bothered argueing with an old guy. gets me no where, so What do you guys think of my problems.
Even with the gates flapping in the breeze, it will still make some positive pressure. Are you sure this engine actually has turbo's? Go and take a photo of the engine and post it up.
post a pic of the engine bay Is this guy a "car yard?" or private sale? If car yard, and the car DOESN"T have turbos but the paperwork says it does, you can take him to the cleaners.
ok ill post a pic of engine bay for you guys tommrow as its 2 dark to take a pic of it. I bought it privately off this guy, in the engine bay there is this modification plate on it with some numbers and dated back to 2006. Ill post up the plate number too so if you guys can tell me what was done to it.
dont forget its a 20yr old car and who knows what it went through back in japan. the targa leak problem seems like an easy fix theres a good thread about it in this forum. the steering and boost issue is more serious. keep off the highways til you get the suspension looked at and OK'd.
hang on, you have another turbo 300zx. who does the servicing on this car then? and why'd you buy another...
