370z Supercharger Boost Issues

pkxu123

Got the car back but not sure whether I should be happy or not. Worth the money? Definitely not. Fun? Sure.

The car didn’t start at all a couple weeks ago then the tuner came down and adjusted the tune.

Now, the car gets CEL flashing maybe once every 3-4 times I drive it with NO power at all when flooring it. The tuner said its a safety parameter they put in place. My oil gauge has stopped working, my 3 other maps the tuner gave me are gone. Heavy rattling sound from the undercarriage (maybe exhaust?).

I have told the shop about all these concerns but haven’t heard back just yet.

The car is meant to go back to their shop this month because they didn’t know about the subaru belt tightener pulley which I supplied with the kit, so they’re going to install it for me.

I went with supercharger because it’s my daily and i wanted a “hassle free” build. But this has given me issues after issues even after I got my car back. Very unfortunate.

ByThaBay

Send me a PM I can help you resolve this.

pkxu123

Really appreciate it. Sent you a PM.

Optimiser

"Heavy rattling sound from the undercarriage (maybe exhaust?)".
Weird coincidence because that was exactly the same for me after the same tune as you (at same place) with same SC setup. They told me after having a quick look it was my Invidia exhaust resonator's internals starting to come loose.

pkxu123

Do you still get the rattling?

Optimiser

I'm going to check again just to be sure and also that it's the same as before, but I think so. I've probably got used to it somewhat. It's most noticeable when car is fully up to temp.

370zMelb

That sounds very disappointing. If they are a reputable shop then you deserve to get a better quality service from them. Giving the car back "unfinished" with PROBLEMS is a big NO NO.

What is the shop name?

If they don't resolve your issues, they deserve to be named and shamed. You can probably even take this matter to VCAT if they don't fix the issues at no cost.

Hopefully you can get this resolved soon. Goodluck.

Keep us posted!

DrBacon

I haven't really followed this thread but reading back it sounds like the shop definitely don't quite know what they're doing. I strongly suggest going somewhere else.

As described in one of your previous posts boost falling off before redline is 100% a direct symptom of belt slip. Since you already have an RPM belt on the supercharger side that is most likely not the issue unless it's extremely loose (try pressing on the belt with a finger, it should be pretty stiff with little to no movement). Looking back at your pictures your serp belt is way too long without that extra tensioner, I run that K071045 belt WITH the tensioner to take up the excess slack, and even then I've been recommended to run the K071040 belt instead which is half an inch shorter.

If you sort out the belt situation and it's still a problem, then it's the intake.

Also, what happened to your engine grounds? Were they relocated or did they simply delete them? They are usually attached on the frame near the supercharger and attached at the top of the engine where the supercharger bracket brace is.

Optimiser

Very good point about the grounds missing on the bracket. I just noticed that now going back to have another look at the pic.
Also your advice above is spot on.

Optimiser

I just double checked his pics and his engine earths are in the the stock position (hidden behind tubing)

DrBacon

Oh that's interesting it's on the opposite side for RHD cars I guess? Never knew that

pkxu123

My car is not with me atm but hopefully I get it back from the shop soon. They saw my email about the car running lean and knocking and called me to bring the car in last Wednesday. Haven’t heard back from them yet but hopefully they are making good progress.

Will keep you guys updated

THE BULL

One of the things I would check are your MAF jumper harnesses since the signal is a shielded wire and the jumper is not. It's possible you might be having MAFs sending an incorrect signal

However being that it's a reputable shop and BYthabay has tune many of them stick with them. Hope you get this resolved.

pkxu123

The shop ordered a brand new Stillen extension harness for me as it was missing in the kit but ill have a look at it.

Got the Topgunz anti slip pulley in but it still made the exact same boost. So it's probably not the belt or pulley that's causing the boost issue?

Not too much of a mechanic head myself but I do still want to get this all sorted...

Anyway, regarding the tune, we're having an issue now where the maps will randomly disappear. The first time it happened, I brought it back to the shop and they flashed the maps on it again. I drove it home the same day and it disappeared again on the second start up.
The shop suspects it's the ecutek bluetooth dongle so they took it back to their shop to analyse it. They flashed the maps back on again yesterday and it hasn't disappeared yet.

DrBacon

Take the intake tube off and run it filterless for a pull. Process of elimination by taking away potential variables.