Dans Twin turbo trouble shoot thread

[DanDrath]

I figured the easiest way to ask all my questions is to just make my own thread.

My newest question/issue: I think the reason for my braking up issue is the timing. I unplugged my bad o2 sensor and the cars running better but still braking up at about 4k and like chugging trying to go. Its weird. Anyway my automotive teacher took a ride and said he thinks its timing which now makes 3 mechanics and my own opinion that its a timing issue. Could adjusting the cass possibly fix this? If so does anybody know how to adjust it.All help is greatly appreciated

Thanks and please read this whole thing lol.

[Zwicked]

If it is timing, all you need to is connect an inductive timing light to either the PTU wire loop of the #1 coil pack connector harness. Loosen the 3 bolts on the CAS just enough so it can be turned with some effort. Start the engine and point the light at the crank pulley. It should be set to 15 degrees BTDC to be right. The CAS should be close to the center of the adjustment range when you are done.

[marty1mc]

I figured the easiest way to ask all my questions is to just make my own thread.

My newest question/issue: I think the reason for my braking up issue is the timing. I unplugged my bad o2 sensor and the cars running better but still braking up at about 4k and like chugging trying to go. Its weird. Anyway my automotive teacher took a ride and said he thinks its timing which now makes 3 mechanics and my own opinion that its a timing issue. Could adjusting the cass possibly fix this? If so does anybody know how to adjust it.All help is greatly appreciated

Thanks and please read this whole thing lol.

What is listed above is the way to set ignition timing, and it is important to remember the CAS should be close to the middle of the settings. If you can't get it to 15 deg or the CAS is set way to one side or the other, then you likely have a valve timing issue and need to check the timing belt.

Next, do yourself a favor and clean every electrical connector. The Z suffers from corrosion on the connectors. Clean the MAF, PTU, CAS, coil packs and injector connectors (if you really feel adventurous, clean the idle connectors as well). Dirty connectors can look like all kinds of problems, timing especially.

[Zwicked]

I meant to mention, if it's "breaking up" in that you mean misfire, I'd check the fuel pressure, plugs (they tell a good story) and test the injectors. Misfire is usually caused by electrical inconsistencies or fuel at high RPM's. If it's not idling 100% smooth then there are quite a few other things to check.

Do you have a real time scan tool you can use while running the car?
Modified by Zwicked at 7:26 AM 3/23/2010

[BigTDogg (MA)]

Definitely your timing. Get a light and set it to 15 degrees. How to do it has been posted many times, so searching will help you in the future.

[DanDrath]

so i got to timing my engine today. We put a timing light on it and adjusted the cas. The timing was way off. Also replaced my bad o2 sensor and fixed the boost leak, Still braking up at like 3500 but what i found out is that my car has 555cc injectors in it, So i dont think its tuned for them, Would that probably be my problem?

[DanDrath]

Ok another question somebody please answer. I need my car tuned. Am i better off going to this tuner i know or getting a tuned ecu from z1??

[DanDrath]

bumppppppp

[NolimitZ32]

If you have the stock ECU then the tuner wont be able to do anything with it unless he is setup to write EPROMs. I think what you need right now is a cheap base map so you can fix everything on the car before you go blowing a bunch of money on a custom dyno-tune. Find a knowledgeable tuner that will deal with the Z32 an go for it, I am having my EPROM base map written by Jason the owner of E-mance yeah he's the guy that sells the ebay chips, I went to a bunch of forums and found him, asked around about his work and turns out the guy is really knowledgeable about tuning and about all Nissans (he mainly tunes 240s), I discussed with him what I needed and we came to a conclusion, he is writing the map right now and best of all he is waaaaay cheaper than JWT or Z1. $85 for custom tunes.

[Z32TT]

are you sure their 555? did you check if your ecu is socketed? i would try harry at ztuner first for socketed ecu

[Zwicked]

Agreed, confirm they are not stock injectors. How did you determine they are 555's?Also, take a look at the ECU. In most cases there will be a sticker on the lid telling you if it has an upgraded chip. If not then you will have to pull the lid and look if it's a socketed chip or the stock soldered in one.I can't see someone going to the expense of installing injectors and not doing the chip as that's the cheaper and easier part to install.

[DanDrath]

the injectors are purple when i pulled the wire off the top. I dont think there are any 370cc purple injectors. I found someone selling an ashspec tuned tt ecu for 150 bucks tuned for 555cc injectors and a single pop charger. Im going to check the ecu today and open it. When i looked at the top an bottom there are no stickers on it. Just in yellow marker it says tt on it.

[Zwicked]

Take the ECU out and open the lid and unscrew the top board and have a look. If the main chip is soldered in, it's stock. If it's got a socket and a chip plugged into it, it's upgraded. Worth checking before spending money

This is the stock chip soldered to the board. If it's been upgraded the chip will be plugged into a socket that is soldered to the board in it's place

[DanDrath]

ok so another question. How can i tell if the engine is a 1995+ engine

[Zwicked]

Look on back of the block, behind passenger side head (good luck eh?)

300ZX TURBO VG30DETT 1991 7/90 - 8/91 050001 - 505918300ZX TURBO VG30DETT 1992 9/91 - 6/92 520001 - 521340300ZX TURBO VG30DETT 1993 7/92 - 6/93 535000 - 536896300ZX TURBO VG30DETT 1994 9/93 - 8/94 545001 - 545828300ZX TURBO VG30DETT 1995 9/94 - 6/95 570001 - 570668300ZX TURBO VG30DETT 1996 7/95 - 4/96 580001 - 580589300ZX TURBO VG30DETT 1996 5/96 - 7/96 960246 - 960294

[DanDrath]

i opened the ecu it does not have a socketed chip Also the cover of the ecu says cf if that means anything

[BigTDogg (MA)]

are you sure their 555? did you check if your ecu is socketed? i would try harry at ztuner first for socketed ecu

2nd

Don't waste your time with Ashspec.

Some old style 370CC/min injectors have purple/blueish connectors.

[Z32TT]

Some old style 370CC/min injectors have purple/blueish connectors.

Exactly their prob just worn/heat soaked from over the years causing discolor, it would make no sense for them being 555 without a chip, be a waste of injector install then imo

[DanDrath]

Yeah well i found out they deffinitly arent 555cc they are 370. I replaced my bad o2 sensor and now my cars actually starting to boost a little bit but its got crazy boost leaks so ill have to fix those. but thanks for all the help guys.

[DanDrath]

Today. I felt boost...in the drivers seat... =-D