Boost not increasing over WG pressure

shadow85

My latest dilema, is 2-fold:

1. Boost rises and hovers around 7.5 Psi no matter what settings I punch into the EBC, in other words I cannot increase it past the WG pressure of 7.5 Psi?

2. Even though the boost only wants to stay at 7.5 Psi, there is a spike in the middle of the boost curve where it jumps by1-2 PSI as in the graph below:




Does anyone know why I cannot increase the boost past the WG pressure.
I have tried SET: 10%, 15%, 25%, 35%, even tried 40% but boost is not increasing past 7.5 Psi, but still spikes to 9.5 Psi.
Its like the EBC is working only as a boost gauge!

I have AAM TT Stage 1 kit
Greddy Profec Oled EBC

Any ideas whats going on?

sirnixalot

Are the vacuum lines plumbed correctly?

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Chuck33079

I have an idea - the shop that installed your EBC is incompetent. This isn't the first (or even second) time they've caused you boost related issues. Take it to a different shop or be prepared to learn a very expensive lesson.

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jwick

^^^THIS^^^

Dude you have created several posts with boost pressure issues. I’m pretty sure you have some plumbing issues either to the WG or EBC or both. Nobody is going to be able to fix it for you over the internet. Take it to a qualified shop.

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SouthArk370Z

@OP: Both Chuck33079 and jwick are valued and knowledgeable members of this site. Take their advice and find a new shop/mechanic. What is your shop going to screw up next?

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shadow85

Yes it is true I have taken the car back to the shop several times because of boost related issues. Ok, so I gues its just a plumbing issue?

I suppose I will take it to another shop, but only reason why I wan't to take it back to the same shop is because they have to fix it for free if it is their mistake.

But maybe it could be a faulty solenoid.

@Chuck, yes it's fortunate that Sebs failsafes saved me the previous boost issue I had a few weeks back, when the boost was sky rocketing instantly because of a melted vacc line.

Does the following setup look correct:


I don't know if my setup looks like that, that diagram was just supplied to me by another mate from the UK who also has the AAM TT kit and same Greddy EBC fitted. So I will supply that to the next shop that attempts to fix my situation if it is correct

SouthArk370Z

Are they going to fix it (sounds like they've tried more than once without success) or bend you over for a free lube job?

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phunk

If you are absolutely 100% confident that you have an overboost protection in your tune, and that you are safe to bump into it... keep cranking it up. I have seen boost controllers that dont do anything until you get pretty high up there in the duty cycle and then become sensitive to each % once you are in the sweet spot.

Reconfirm you have overboost protection, then crank it up 5% and try a pull and repeat until you either hit the end or the start seeing boost go up.

You can also ease into the throttle to prevent hitting overboost protection, which would be even more ideal and how I would do it in my own car.

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hc_416

Just FYI, that boost controller is a pain to work with. It never seems to work right and to find someone that can hook it up right is a pain. After that was taken care of the dam thing broke after a year of use, the dam solenoid broke. I would recommend a different ebc, just use spring pressure, or try to give Z1 a call; I believe they have a lot of experience with that profec.

jwick

I have the original old school Profec Spec B and it works great. Sucks they screwed up a good thing with the update.

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Spooler

I have one brand new still in the box I bought from NOPI. LOL Had it for years for my 1975 280zt.

jwick

I bought mine NIB off eBay. It’s pretty simple to run. You just select % over spring pressure you want to run.

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Martijn_b

Like Phunk says, 40% is still low. In my previous car my settings to rise above spring pressure started at 65%.

That being said, be VERY careful. Just try it in 4th gear cruising and ease the throttle whilst keeping a close eye on the boost.

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shadow85

Thanks phunk and Martjn.

I might try this!

The highest I tried on this EBC, was 40% I think? Still gave me like the usual 7-8PSI with the small spike upto ~9.5PSI

After trying 40%, I thought to myslef, screw it! Lol

But like u guys said, I may need to try higher, be easing into it.

What a shame, this is a very nice looking EBC that was reccommended to me by several guys...

shadow85

I am going to ask seb if I have the overboost protection.

But even if I didn't have overboost protection, wouldn't the 'Limiter' function on the EBC be the same thing?