Boost not increasing over WG pressure
 

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:

https://i.postimg.cc/431HyHFG/20181120-180442.jpg


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?

Are the vacuum lines plumbed correctly?

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.

^^^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.

@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?

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:
https://i.postimg.cc/fyM3Yck5/IMG-20181129-WA0000.jpg

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

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?

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.

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.

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

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

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

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.

Verstuurd vanaf mijn SM-G950F met Tapatalk

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... :(

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?

Probably not.

Also, do you really want to trust a thing you don't believe is working or even hooked up properly?

Boost controller limiters are a novelty. If the boost controller has failed or the vacuum lines to the wastegate have failed, the BC limiter cannot save you. Always best to have a proper safety in the engine control system.

Since my boost is giving spikes.

Should I set my gain to something like -35% if I make the SET something high like 65%?

It doesn’t matter for now you’re just confirming that if even does anything at all. You can fine tune it after you’ve found out.

Dude , I think I gave you my start settings awhile back. May be different from a single turbo but start low and push till it works without going over. Also I remember I told you about the gain setting needing tocome on slowly because if it spikes you need to back the percentage down. From everything you're saying , your plumbing has to be jacked up. My settings were:

SET=24%
Warning= 10.5
Limiter= 5%
Start= 7.5
Gain= Slow going after everything else is set, advancing till surging or spikes then back till it does'nt.

The only real numbers are Warning and Start, everything else is a percentage. Your start boost cannot be lower than wastegate and the limiter is the percentage of boost cut after you hit Warning. My set boost was at 24% to reach 9psi on a Single turbo. Not sure how that translates to twins. Also do you have external wastegates or an internal? You need to physically get under there and inspect where each line is going. What made it easy for me the first time was I had red for upper and blue for lower wastegate. That way there was no confusion on the back end. Also my boost reference is from the intake manifold and the signal boost comes from the drivers side charge pipe. Your system is common but it seems at this point you need to stop worrying about the people who could'nt do this right and drop a couple dollars to pay someone who knows to actually touch this and make it work. A good idea would be to hang around and watch them do it or show you what they did when it's done right. Don't feel all crazy about it either, because I just went through this with my fuel system and Charles had to pull me from the brink. Just like you I paid someone to do what I already knew and I assumed they did it right and in reality they screwed up something so simple I overlooked it because it was just that simple. You're in Oz and I've seen some monstrous builds going on there so people who know are definitely there for you. Good luck.

Thanks solidus. Yes I do remember us speaking and remember u saying the gain has to be adjusted slowly until it takes effect.

I did try this a few times but gave up because evertyhing I was trying was not showing any change. Now I was thinking because my boost is spiking up that I should go backwards on the GAIN. I.e. a negative value.

And then again someone else said on here, it maybe that my SET just needs to go higher. They mentioned it had to be a minimum of 65% for theres to show effect. So now I am planning on trying a higher SET value than the max I have already tried of 40%.

Then some suggest the plumbing is incorrect. I am hoping it isn't, but if it is then yes this time I will definately go to another shop who can guarentee me some solid function. I am hoping to be able to try the SET higher first to see if there is any effect?

Dude, turn the goddamn thing off and drive easy until you have a QUALIFIED shop double check the plumbing.


Sent from my iPhone using Tapatalk

Ok so I did a few pulls other night by setting the SET to 45%. The highest I have tried so far, this seems to give me consistent movement with the boost now. Althought it only added approximately 0.5 PSI.

So now I am always hitting 8 PSI @ 45% SET, anything lower than 45% wil result in 7.5 PSI. At this point I was pretty tired from the pulls and did not increase the SET more to test further. I was happy to see it finally go above wastegaste boost pressure.

I will at a later date, increase the SET to 50% and test the boost pressure then.

UPDATE:

OK tonight, I tried SET 65%. GAIN -10%, and this has given me a solid 10 PSI from 3800RPM no fluctuating or spikes/taper.

Think I finally got it!

Glad you got it sorted. :driving:

Thank you. I only briefly tested it once, and the boost looked good on the Ecutek logs.

Have yet to try multiple times to make sure that wasn't a fluke, lol.

If you're tuning with Seb it'll be a great idea to let him know you've increased boost. As a person who tends to catastrophically break $#it previously thought unbreakable, I opted for boost by ECU and I don't touch any parameters until Seb tells me. If you're stock block and running 10psi on a tune set for 8psi I highly recommend staying out of boost till he sends a new tune and watching AFRs and oil temp. As a matter fact just write down those settings or use them as the high boost setting and go back to thr level you're currently tuned at till he tells you.

Lol dude ofcourse I am only increasing the boost on Sebs commands. No way in hell I would be tampering with the boost levels without his consent! :)

He actually instructed to turn it to 10-11 psi and send him a some log. I am only on 8.5 PSi atm, not 10psi yet as previously thought I was on. Have yet to increase it from here.

Well I was going to increase the duty cycle more to try and get upto 9p PSi atleast. But Seb informed me that 65% duty cycle is way too much for only 8.5 PSi. Ontop of that I now have an issue of the AFR rising from 11.5 to 13.0, from 6000 RPM to redline.

Probably a fuel pressure drop. So have to get that and the EBC sorted out together. Fml.

At this point my sincere advice to you is to take your car to someone that knows what they're doing and have them go over what you've done and reset everything properly. Not a knock on you , but something I absolutely know from personal experience. I have blown a motor, had extensive fuel problems and had to be humbled.
A few posts back I gave you my set boost percentage of 24% to reach 9psi so that should have told you yours was way out of range. I also had a problem with fuel that probably had Seb wanting to slap me. Wasn't exactly my fault but in the end it was because I did my return system myself the first time and it was perfect. When I paid someone they screwed it up to the point it was so stupid it had me on the phone with Charles at 10pm. The problem was that they plumbed the whole system wrong. (Who caps a fitting on a damned bank 2 fuel rail!?!?!) The result of that was what you described, afrs going lean at WOT. In the end I had to actually explain to the people I paid to do the work how to do the work. Even then I have at least one more issue to have fixed after I'm done tuning.
Whatever happens I can guarantee you that taking it to a competent shop to clean things up is at a minimum 90% less expensive than having a glitter party in your oil pan. I've been to one and I promise it's a numbing experience about as exciting as a prostate exam.
Do what you want but now you can't ever say nobody told you.

He won’t listen. That has been suggested by several of us already.

When did I say I won't listen?

I just attempted something that somebody else mentioned to me in this exact same thread, i.e. keep increasing the duty cycle on the EBC.

I tried that. So my next step, is taking it to another reputable shop. I Just haven't got around to it yet. Its easy for you guys because you have reputable Z shops around every corner yeah? I live in a place where we have 0 in the whole state. I have to be careful where I take it, otherwise these things might continue happening.

We're mostly cranky, old guys around here - with little patience and hair triggers. Heed the good advice and ignore the rest.

https://keithroysdon.files.wordpress...on-truckin.jpg