I need help from some z pros to save my Z

The Nissan 300ZX (Z32) general community discussion forum
GRNT300zx
Posts: 3
Joined: Tue Nov 12, 2013 8:02 pm
Car: 1990 Nissan 300zx TT. NA to TT, 5sp, Jwt 500 turbos. Stage 2 engine, testpipes/downpipes,615cc, dual intake with selin MAF translator, z1 stage 1 heads, Plus several other misc upgrades.

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Quick over view of upgrades, rebuilt engine, JWT 500 turbos, downpipes and testpipes, 615cc injectors, FMIC, ECU program (kinda) will explain that in a few. Other misc upgrades.

Here's the deal. I had a great running TT. The engine had a stage 2 rebuilt, new 500 turbos. It ran great. I decided to upgrade the injectors to 615cc and dual intakes. I had the ecu reprogrammed by Z1. I have a dual intake setup with selin translator. Thats when things got bad.

I had this all done almost 2 years ago. It started but when you hit the gas it would attempt to die. If you kept the gas going it would die. Would not go over 2000 rpm. Was running extemely rich. I couldn't get it right so its sat in the back of the shop for a long time. Me and my brother have a 5 car shop with lift. He builds high horsepower drag mustangs. He is a mechanic but not real familiar woth nissans. I love mustangs but always loved my z more. I got so frustrated that I couldn't get it running that I put it in the back of the shop. Well recently I decided to gI've it another shot. Pulled the engine, went all the way back down to the short block and built it back up. I got it all put back together and started it today. It started up and when I hit the gas it dies. I'm unsure where to try next. I know the block and heads are good. I've checked for intake leaks. Everything is tight. All new silicone hoses for all vacuum lines including silicone pvv hoses and Idle air hose set. The reason why I say I kinda had my ecu reprogrammed is this. I sent it to Z1. I found out they sent mine to someone else and I got that persons. They assured me it had the right programming though. I'm starting to wonder if that is the problem. Would it matter if they had the stock injector or 555cc injectors in the ecu program.

PLEASE HELP OR I WILL NEVER GET TO DRIVE IT AGAIN. MY WIFE IS ALL OVER MEABOUT IT.


GRNT300zx
Posts: 3
Joined: Tue Nov 12, 2013 8:02 pm
Car: 1990 Nissan 300zx TT. NA to TT, 5sp, Jwt 500 turbos. Stage 2 engine, testpipes/downpipes,615cc, dual intake with selin MAF translator, z1 stage 1 heads, Plus several other misc upgrades.

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I reposted this in technical page. I meant to post in tech page originally

ThisIsSparTTa
Posts: 738
Joined: Wed Sep 26, 2012 6:02 pm
Car: 91 300ZX TT 2+0

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I wouldn't go to 555CCs, guaranteed to fail with ethanol. I know people have issues with the 615CCs, so a lot of people go with 740s. Were you tuned for 615CCs or 555CCs? I'd make Z1 send you a new chip for your setup.

Have you checked fuel pressure? Checked all your fuses and relays? Are you sure you have your Selin Translator in the right mode and that it matches what your tune is expecting? What is the behavior when the engine dies?

z32loverboy
Posts: 516
Joined: Tue Mar 22, 2011 6:05 pm
Car: 1990 300zx CRP N/A 5 Speed (wreaked, now a shell) SOLD

1993 Slicktop CRP N/A 5 Speed w/ '90 built N/A motor and interior

1958 Ford f-100 straight-body (Grandaddies truck, resto-project)
Location: Nashville, TN

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I would say its the tune, Ohm out eh injectors, Make sure your tune is set up for the specific flow rate of the injector you use (555cc, 615cc, 740cc, Ect) If not it won't run close to right. If all that is right then talk to Z1 and tell em to send you a new chip and throw that baby in and see what happens.


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