boost controller setting

[joffo81]

Hi everyone, I have just bought an NXS manual boost controller and am not sure what to set it too.

I tried the search engine and didnt find any conclusive answers.

What do others recommend who have the same engine and have actually done it?

I have the ZD30 engine with chip and 3 inch exhaust and small intercooler.

I would obviously like to set the boost slightly higher than standard but not to an unsafe level.

How will I tell if there is too much boost before I cause any engine damage? Is it enough to just monitor my EGT gauge to avoid excessive heat(which I do anyway)?

 

[tweak'e]

its not about what the engine can handle but rather what the turbo can handle.
i'm not sure what the limit is but 18psi sounds good.

 

[joffo81]

Thanks Tweake. I only have a stock turbo. I was thinking 18PSI but wanted to see what others have done with a similar setup.

I think in theory, if I increase boost I should be able to make better use of the extra fuel injected by my chip hopefully without increasing EGTs. Does this sound right?

 

[tweak'e]

sounds about right.

 

[ShortyNavros]

By running more boost it should lean out your fuel mix and effectively reduce EGTs if you are using a higher boost than what it's currently set at.

 

[happy john]

They are preset to 3psi above standard ,so stock being 15psi you should be around 18psi approximately if you simply install it.

 

[sparra04]

A mbc should always be used with a boost gauge.......if you value your turbo
As others have suggested 4 or 5 psi is a safe gain and should help your chip perform

 

[joffo81]

Thanks for all your comments fellas. I feel much better about installing it now. Can't wait for it to turn up in the post! I agree Sparra- I definitely wouldn't install without having a boost gauge already!

 

[happy john]

Got to agree with this, mine was set to 19 2 years ago when it was dyno tuned then recently started hitting 21psi for no reason. Had to back it off.

 

[Cometbreeze]

Did you notice that change via dyno Happy John and your gauge didn't pick up on it ?

 

[2greedy]

Fitting a manual boost controller will do nothing as far as i know as the ecu will override the settings?

I have mine chipped and have asked the same question numerous times and have tried it, i have had it wound out to 25psi and noticed no gain whatsoever, from what iv'e been told your chip needs to be re-tuned be fore you'll see any gains of the extra boost.

 

[joffo81]

Fitting a manual boost controller will do nothing as far as i know as the ecu will override the settings?

I have mine chipped and have asked the same question numerous times and have tried it, i have had it wound out to 25psi and noticed no gain whatsoever, from what iv'e been told your chip needs to be re-tuned be fore you'll see any gains of the extra boost.

REALLY?? You're the 1st person i've heard that from!

Anyone else confirm or deny??

 

[sparra04]

the ecu doesn't over ride boost in the D22,it does in the 40.
An mbc will increase boost in the D22, there is a small gain, well there was in mine (19psi) and I had no chip,worth doing in the D22 imo

 

[tweak'e]

as above. it will work in the d22.
for decent gain in power you need to add fuel.
however the mbc will help get the turbo going a little bit sooner.

 

[joffo81]

Thanks for confirmation Sparra and Tweake.

 

[happy john]

Did you notice that change via dyno Happy John and your gauge didn't pick up on it ?

Just saw this sorry for the belated reply. The hose around the boost controller had loosened and was not working correctly. The tuner picked up on this when I had a service and gave it a quick run on the dyno no charge.
John

 

[Rumpig]

With the zd30 once you go past 18 psi it cuts the fuel back.

 

[sparra04]

With the zd30 once you go past 18 psi it cuts the fuel back.

bummer
there must be a way around that

 

[tweak'e]

bummer
there must be a way around that

fuel cut defender i think its called. mec version simply bleeds boost off on the boost sensor line. electronic one clamps the voltage from the map sensor. basically the max the ecu sees is 15psi.

 

[Rumpig]

Or remap the ecu.