So i started this project Nov. 2014. I have a 2004 350Z with about 80,000 miles.
The car only had a K&N filter and coilovers. The car ran perfect, no issues at all. Every since this project began it never ran the same since.

I completed the build but I could never get it dyno. The car has a rough idle and bogs out when you step on the gas hence not being able to get the dyno. Heres what it has:

ATI procharger supercharger (bought it used on here, biggest mistake i ever made). It was missing bolts, pipes, belts, bad bearings, etc. I became really good friends with the procharger rep since i ordered so much from him. Spend about $1000 more on parts

Parts list:
GT MAF, Walboro 255LPH fuel pump, NGK plugs 1 step colder (.035 gap), Deatscherks 600cc injectors, 5w30 royal purple, and 1 new coilpack on cylinder 1, and a Kinetix V+ Plenum ( i dont recommend getting this, mine was warped which leaked air) I bought new gaskets and put the stock plenum back on.

So after 2 failed dyno runs, Autozone diagnose and a $200 diagnosed check from a shop giving me the same random code (multi miss fire, which could mean anything). Hours of removing and putting things back together......

Im out of options.

The car currently has the stock plenum and the belt to the blower is off yet the car seems to idle worse now with the blower belt on or off.

If anyone can recommend a shop in vegas or anything helpful. Let me know cause im really to just burn this thing and **** on its ashes.

 

Have you put the stock MAF in it and started it up? Have you check to make sure all your spark plugs are getting spark? Have you check your e-vap line to make sure its still connected, have you made sure you don't have a leak. I know there was a guy whos oil cap was dicked up and that caused him to have a bad miss.

 

You in over your head, but this is a good opportunity for you to learn about automotive.

Every time you modify your vehicle, you will encounter problems that need to get worked out. That's just the name of the game.

If you can't handle it, I'd stay out of the modifying cars bis.

Most of the time yo will have more problems if you try to go cheap and buy something used. It cost a lost of money to play, that's just how it is.

ProCharger makes a good Blower. but the Kit they came out with for the 350z has been plagued with problems from the beginning. That's why their are so few ProChargers on 350z's or G35's.

 

First time I was on the dyno with my 350z, I had major belt slip + the tuner did not know the software for my piggyback ecu. I think he was expecting me to pay for him to learn it. He wanted to charger me $700 for the day. I gave him $300 and said "See Ya".

This prompted me to learn the software and do all my own tuning.

Plus I have been around Race cars all of my life and have 35 years experience as an Mechanical Design Engineer, and this happened to me, first time out. **** Happens........

 

^ +1 This sounds more like a problem with bad luck/bad tuning more than the kit itself. I have a procharger kit and the car runs great. The idle/bogging really sounds like a tuning issue with the fuel and most likely MAF adjustment. the random misfire usually also occurs with bad tuning. If you have uprev tuner version I would go to the tuning101 thread and try and work out a tune from scratch yourself.

 

Thanks guys for your info. So I disengaged the belt that pulls the blower. Installed the stock plenum with new gaskets as mentioned before, started the car and sprayed some carb spray on the the pcv values and manifold. No change in the idle so I'm assuming there's no leak anymore.

I ran the car and it no longer bogs out when I hit the gas, she runs fine. Just at a stop the idle stays at a 1000 rpm an drops a little then comes back up. Plus sometimes the car dies when I'm coming off the gas.

I think at this point as u mentioned JDM, it just needs the tune. One of the big problems had been fixed by putting the stock plenum back on.(the car bogging out when I hit the gas).

Anyone agree that at this point the tune will fix the rough idle at a stop and the multiple miss fire code that keeps popping up? I'm wondering at this point of the game what would be the next wise step to take

 

Doesn't this have some sort bypass valve? Maybe adjust it? A tune could potentially raise the idle to compensate for sure.

 

Do you have uprev?

 

Nope, nothin that i can find at least

 

Yes prochargers have a bypass valve, its right below the procharger on the U shaped pipe going to the fmic. I reccomed getting getting uprev and try getting it tuned.

 

Ya i do have uprev, im doing my tune with Church tuning. They couldnt complete my tune previously cause the car would bogg out when they tryed to accelerate on the dyno.

NOw that the car doesnt do that anymore, hopefully I can complete the tune and get everything in sync.

 

You have a cable? Can u email me your tune?

 

Hey guys, so I notice with the supercharger belt is disengaged the car idles rough but doesn't spudder when I accelerate. With the supercharge belt engaged. It idles rough and spudders when I accelerate. Keep in mind, I don't have a straight tune yet.

I did a smoke test with a cigar and a hose an saw smoke coming out somewhere by the lower manifold. Not by the lower manifold gasket tho. Like by the injectors somewhere.

Check out the picture..... It's coming from under that plenum by the injectors. I was blowing smoke thru that inlet as well. It that the right area to hook up the hose for a smoke test?

Where could smoke be coming from on the lower manifold if that gasket is brand new?

 

Cant really see anything from your picture, are you sure your lower plenum isnt hitting your fuel rail? I would take it all apart and make sure every thing is ok. I know I was having a problem getting my to seat right when I took it apart just had to mess with it for a little while.

 

seems like it would have to be either a warped plenum or you pinched something in there like a wire, or piece of insulation. The plenum could also be held up by the injectors but doubt that would happen with deatchwerks unless you didnt seat them correctly. I know for my RC750's I had to grind down a bit off the bottom of the plenum for it to sit all the way on.

 

jdm-v35 & Conway_160, thanks for the reply.

I know there's no debris between the gasket and the lower plenum. Cause I sprayed it down with carb cleaner and put some oil on the gasket. But it may be hitting on the injectors or fuel rail. Ill check that out again.

This may be a stupid question, could the smoke be coming from anywhere else down there besides the lower manifold?

Here's the same pic but with the smoke areas marked.

 

...

 

down there the only things that could be leaking would be injector O-ring(maybe you tore it on install) or the lower manifold/runners section could be not seated correctly(due to injectors/fuel rail) or the lower manifold is warped if you are definitely sure you didnt pinch anything in there.

 

Hi guys so I popped out the fuel rail and Deatscherks injectors and noticed that the rubber grommets didn't come out with the injector. The stayed in the block. So I cleaned them an noticed that when I install 1 individually, it sat snug (kinda popped in) but was loose with out the rail. Is this normal for this brand injector?

I took 2 pics.....1 is with the grommet on how it came(with issue above). The other with the grommet pushed up further, but with it like that, it doesn't fit in the block cause pushing it up kinda expands the grommet. Did Deatschwerks sent me the Wrong injector or does it sit loose like that with out the fuel and pop out that easy?