Ok chaps, I am a bit confused here. Currently have boost jets installed and ECU chipped. This was actually done by Ztech a few months back. I don't know what chip it is or how much increase in boost I have as don't have a boost gauge. However I would like to know what is the difference in boost jets as opposed to an electronic boost controller. What are the advantages and disadvantages on boths ? Would the later make the Zed boost more higher hence more power ?

 

Thanks

There's no advantage in boost jets over an electronic boost controller. They are a cheap way of achieving the same thing. You definately shouldn't have them without a good boost gauge, and don't even think about adjusting them without the gauge. My opinions are very set on the matter because my first zed had them and a dodgy stock boost gauge and trashed the engine a few months after buying it. Do yourself a favour and at least get a good boost gauge, or preferably an electronic controller. Dave

 

ps I've got a brand new greddy boost gauge for sale!! but thats not why I said what I did!

Cheers bud ! How much do u want for the gauge ? Also what size is it ? Send me a PM.

IIRC, an electronic controller will override

the safety boost feature, hence no safety boost

if needed.

With jets you obviously still have the safety boost

feature.

Plus...As Royal said.....get a boost gauge......now!

i was told you get a lot more boost spike with jet's. go electronic like a profec b.

Ztech should be able to tell you what boost the car was running when jets and chip fitted mate as they would have needed to ensure it wasn't too high, mashed rings from running too high boost!

So as everyone says, boost gauge is a high priority for you before it's too late.

Boost spikes often with jets and no high/low adantages where as electronic you set highs and lows and no boost spikes.

HTH

Cheers

smithy

As said Syed,

 

Boost controller EVERYTIME!!!

 

That couple of hundred more will give you peice of mind and save you £2000 on a rebuild!

 

All the best

 

Rich

There's a lot more to it than that. With an EBC you can do things that can't be done with jets.

They totally eliminate wastegate creep for one thing by completely blocking the pressure signal to the gate until a set level is reached so spoolup is quicker.

Also, with jets installed as restrictors not bleeds you will still only end up with 7psi on a VERY long full thrrottle run as the pressure will equalise across the jet.

Ok chaps, I am a bit confused here. Currently have boost jets installed and ECU chipped. This was actually done by Ztech a few months back. I don't know what chip it is or how much increase in boost I have as don't have a boost gauge. However I would like to know what is the difference in boost jets as opposed to an electronic boost controller. What are the advantages and disadvantages on boths ? Would the later make the Zed boost more higher hence more power ?

 

Thanks

 

 

boost would of been set up to around 12-13psi and a safe chip fitted,your welcome to come back and and have it checked again,or as said buy a gauge,good thing about fitting a boost controller,is no matter what the weather you can ajust acordingly,so if its raining you can choose a lower setting to aid better traction,etc etc

There's a lot more to it than that. With an EBC you can do things that can't be done with jets.

They totally eliminate wastegate creep for one thing by completely blocking the pressure signal to the gate until a set level is reached so spoolup is quicker.

Also, with jets installed as restrictors not bleeds you will still only end up with 7psi on a VERY long full thrrottle run as the pressure will equalise across the jet.

 

i agree that an EBC is better as you stated john, but disagree about the pressure equalising. mine holds steady even flat out along a motorway at full throttle.

 

think of an air compressor with a regulator. the reg is just an adjustable resritiction (boost jet ;) ) wind the reg in & the pressure will reduce. otherwise a spray gun would be chucking out more & more paint the longet you held the trigger!

There is no net flow unless the wastgate is leaking and as pressure drop is proportional to flow then there can be no pressure drop.

It might be that in reality it takes ages to get there but it will eventually.

i agree that an EBC is better as you stated john, but disagree about the pressure equalising. mine holds steady even flat out along a motorway at full throttle.

 

 

Same here Paul, I had boost jets for two years and the boost DOES hold on full throttle infact all the way to 176mph until I backed off. If you can reach that speed and hold a bar of boost I don’t think it really matters that it may ease back a little using jets.

 

IMHO the most IMPORTANT issue in this thread is a Z owner has had a boost upgrade and a chip installed and he has no idea what boost he is running is not an ideal thing to do.

Syad get a quality aftermarket boost gauge fitted

But I'm guessing if SE installed yours they were used as bleeds not restrictors in which case that would happen.

 

It may be that it takes so long to happen that in reality you can't actually do it, TBH if you know the volume of the chamber inside the wastegate then its fairly simple to calculate. Might do it out of interest if I can be arsed later on.

i agree that an EBC is better as you stated john, but disagree about the pressure equalising. mine holds steady even flat out along a motorway at full throttle.

 

think of an air compressor with a regulator. the reg is just an adjustable resritiction (boost jet ;) ) wind the reg in & the pressure will reduce. otherwise a spray gun would be chucking out more & more paint the longet you held the trigger!

 

Agree Paul. Mine holds boost too all the way up the rev range with no drop off at all. I will get an aftermarket boost controller when i've got some spare cash but in the mean time everthings fine so i'm not gonna worry.. Got upgraded 360 degree Roller baring turbos and get very quick spool up too... Oh and 2 Aftermarket boost guages!!! :p

There is no net flow unless the wastgate is leaking and as pressure drop is proportional to flow then there can be no pressure drop.

It might be that in reality it takes ages to get there but it will eventually.

 

why does my gauge on my compressor stay at a lower pressure when i wind it in then?? :wack:

A regulator is a completely different device all together!! It's a variable valve with feedback from the downstream side of the restriction acting on a diaphram to close the valve.

If it was simply a variable restriction without feedback then the pressure WOULD equalise when the flow was stopped.

A regulator is a completely different device all together!! It's a variable valve with feedback from the downstream side of the restriction acting on a diaphram to close the valve.

If it was simply a variable restriction without feedback then the pressure WOULD equalise when the flow was stopped.

 

no, i mean the regulator on air compressors in my workshop. its just a tap! the pressure gauge after that will hold at a lower pressure. surely thats the same principle?!? :confused:

NO! The pressure will only hold lower when there is a flow through it. If it holds lower and constant at all flow demands then its more than just a tap.

 

DP = (8 μ L v) / (Pi R^2)

 

Granted reynolds group is also proportional to velocity so you have to iterate it a few times with real numbers but as v --> 0 then DP --> 0

NO! The pressure will only hold lower when there is a flow through it. If it holds lower and constant at all flow demands then its more than just a tap.

 

DP = (8 μ L v) / (Pi R^2)

 

Granted reynolds group is also proportional to velocity so you have to iterate it a few times with real numbers but as v --> 0 then DP --> 0

 

err, ok :wack:

 

my boost gauge still holds steady with jets tho!! :p

Lol :tongue: