Wastegate Info needed.

[cupra_matt]

As you all know i run an Apexi AVCR to control the boost on my car.

It doesn't belong to me as i borrowed it from a friend while his car was off the road, its soon to be alive again and he will need it back.

I cant afford to buy an apexi at the minute due more important things.

What i want to know is "why when i plum N75 back in does it overboiost and run sh*t"?

From what i gather Jim @ star said it needed to have a boost controller due to fact the wastegate was preset too 1 bar. So i tested this, when apexi is switched of and the wastegate is self regulating it will hit 0.75 BAR and no more. Not 1 Bar.

Correct me if iam wrong but i think K03 / s is preset to 4 - 5 PSI.

Can i adjust my wastegate and preset it to the same as a K03? and by doing this will the N75 control it ok?

Or on the other scale can i preset the wastegate at 1.3BAR and let it regulate itself? Will this work or is it just me being a idiot.

Sorry if these questions appear stupid to some of you, but iam not too clued up what affects the above adjustments might have?

Any info, advice and help would be appreciated?

 

[h17och]

i was running a forge actuator set at 21psi on a k03s and that was with standard n75

not sure if that helps?

 

[cupra_matt]

i was running a forge actuator set at 21psi on a k03s and that was with standard n75

not sure if that helps?

Iam not sure it will have been preset at 21psi.

But interesting all the same.

Jim told me i needed a boost controller due to the GT2X being preset higher and him not being able to control the boost without one.

But yet Bill can run 2.2 Bar using N75 and jabba can do IHI conversions still running N75.

So why the hell does mine go mad when its plumbed in. Its annoying me.

I would rather the car control its own boost rather than having a aftermarket boost controller on it.

It is the same for Robdon's he is running an apexi too

 

[ibizacupra]

Iam not sure it will have been preset at 21psi.

But interesting all the same.

Jim told me i needed a boost controller due to the GT2X being preset higher and him not being able to control the boost without one.

But yet Bill can run 2.2 Bar using N75 and jabba can do IHI conversions still running N75.

So why the hell does mine go mad when its plumbed in. Its annoying me.

I would rather the car control its own boost rather than having a aftermarket boost controller on it.

It is the same for Robdon's he is running an apexi too

It sounds a case of he cant map it to control a different table for N75 thats all, not that it cant be done cos it can by others, Jabba, Custom Code etc.
You dont have to resort to other means of control if you have the means to map the ecu fully. I have gone Apexi for gear limited boost control and switchable boost as additional features the std ecu cant do for me & the stock n75 valve is'nt up to reliable control with 2.2bar boost pressures.

Is the wastegate actuator on the gt2x adjustable at all? Forge ones for example have different springs which give varying std pressure actuators.

Worth a try if possible is winding more preload onto the actuator as this will increase the static pressure setting on it. Crude MBC's are used too to bleed a static psi out, but proper regulated control is the right way of doing it IMHO.

 

[cupra_matt]

The only thing adjustable i can see on it, is the acuator - wastegate rod.

I am having other probems with the car aswell, but iam 99% sure this is due to the map, and it needs sorted.

 

[ibizacupra]

The only thing adjustable i can see on it, is the acuator - wastegate rod.

I am having other probems with the car aswell, but iam 99% sure this is due to the map, and it needs sorted.

try more preload to it if you want more static psi, but it sounds like you have other issues which may well be hindering things

 

[cupra_matt]

The other problem iam having is.

When flooring the throttle past 5K, once you back off the throttle it keeps going for half a second, but only past 5K.

Also, if i hold light throttle with no load on the engine too 5K it takes of at 100% all on its own then starts miss firing. You then have to switch off then back on again to clear miss fire.

I have tried everything, thinking there was possibly a faulty sensor but not found anything wrong any where.

It can be one thing only in my eyes and thats the Map, because when it takes of on its own everything is dutying 100%, no faulty sensor in my eyes would do this?

Its annoying and bloody dangerous, especially when my wife is driving.

Any thoughts?

Also, would more preload mean it would hold a higher boost pressure without a controller?

 

[ibizacupra]

more preload on the actuator would effective increase the static boost (from the actuator before n75 bleed off)

Is yours physically chipped or reflashed?

start again time perhaps on that score.

 

[Havok316]

my ko3 hits 21 psi then drops to 19/20 and im using a LCR n75 and its working great!

 

[Sharky_82]

Havok - ive simular bhp levels to you - should i use a forge actuator or keep the standard on there?

 

[ibizacupra]

std factory actuator will be running between 5-7psi

 

[Sharky_82]

sooo if im running about 20ish - a forge one it is then!

 

[ibizacupra]

are you saying your running 20psi on actuator pressure alone? or are you including N75 running.

N75 disconnected electrically is actuator pressure (effective)

 

[cupra_matt]

Bill, when mine was remapped he replaced a chip in the ECU. Since then i have had this problem.

 

[ibizacupra]

Hmmm.
judge weighing up your options..

replace chip with oe type and then reflash possible once you find another mapper if you have given up.

 

[cupra_matt]

Hmmm.
judge weighing up your options..

replace chip with oe type and then reflash possible once you find another mapper if you have given up.

I cant afford to spend another £500 on getting it right when it should of been right straight away.

Iam gonna email Star and tell them iam not happy and want it sorted.

He knows there is a problem with it but he wasn't bothered (or didn't seem bothered). The emails i have go back to the day after the mapping session when i was first telling him.

I will give him a chance to rectify it before taking the matter any further.

 

[ibizacupra]

good luck. hope you get it sorted.
not unreasonable to expect it to work properly.

I do seem at a loss why on more than one occasion the boost control is put to a.n.other device (MBC, Apexi etc) when all thats being asked of it is conventional control within normal remap levels. Has to be a limitation on what they can actually map, as it can and is done by so many other mappers.

Seems a workaround to something which caant be mapped properly with whats available to them.

 

[bigjode]

my ko3 hits 21 psi then drops to 19/20 and im using a LCR n75 and its working great!

Aren't all N75's the same part number, even across the VAG range they're all the same?

Therefore an LCR N75 is an Ibiza N75 anyway?

 

[ibizacupra]

different varients of letter suffix on them and some are different ported. (various internal bore size differences which effects the "bleed" off)

 

[bigjode]

different varients of letter suffix on them and some are different ported. (various internal bore size differences which effects the "bleed" off)

I was aware of this, but i thought the LCR used an F as std, as does the Ibiza, and was getting at the fact that all F's are the same.

Well actually I was asking if thats the case because I don';t know for sure