Actuator

hmm, ill leave that then i think i have enough probs as it is with things!

Gricey wrote:

mine used to chirp its easy to do i might do it again and see if there is any noticeable power difference ?

On the 1.8T you have to be careful with the REcirc BOV. I helped a friend replace it with an atmospheric one when we changed the turbo etc. We had to change the MAF sensor and remap it to get the engine running propperly. The problem with the recirc type is its not really performance friendly. SO when you start adding huge turbos, its starts to cause turbo shutter stall. After the remap his car was hitting over 500BHP. That was one wicked TT. I think it may be possible to remap the the engine to not expect the recerculated air through the MAF on the latter type 1.8T. Not 100%sure though.

500bhp???

which turbo where you running? and how did you get it to fit? what manifolds and wastegates did you use?

ive had a quik look.

no one has got over 500bhp out of a 1.8t?

so this begs the question can i do it? haha! i need more info tho...

most 500bhp+ 1.8t have gone under the knife-involving stronger rods, pistons, piston rings, trued and welded cranks, extensive head work, inlets which cost nearly £1500 or more...but more importantly, they are BI-turbo (this doesnt mean they like boys and girls)

which turbos did you fit to your mates TT pete? id be well interested to know, might have ago on the bezza, actually i wouldnt its FWD.







back to the original post, do not use a atmospheric BOV...my mate decided to do this on his MK4 Golf 1.8t..after a while (i mean months) ended up over heating and put a piston on the road...was loud though.. now in a scrap yard, as it went up in flames...

Are there now two things we are talking about here.

The diverter valve (or blow off valve BOV or Dump valve) releases the boost in the pipe to stop turbo stall and stop inlet damage when you take your foot off the accelerater. This means the turbo can get back on creating boost when you accelerate.

The wastegate controls the amount of exhaust pressure that hits the turbo's blades and therefore controls the amount of boost created. It would divert the exhaust via another route but not past the blades. However, we can't vent that gas to the atmosphere as we have road going vehicles.

Surely Atmospheric Diverter valves just waste work already done, the compression of the air? A cold side Diverter would put dense air back into the air box which is what we all wont isn't it?


Thinking through what your mate did Mr Wild, the engine would expect air in the MAF that wasn't there, however it would know it was missing because it checks. Either way, it takes another reading post turbo to let the inlet know the fuelling should be, it would be having to make alterations that it was not expecting so would run a bit rough and may put on a limp light. I wonder why it over heated??

Wildchild wrote:

500bhp???

which turbo where you running? and how did you get it to fit? what manifolds and wastegates did you use?

Hey James,

I think I left out quite a bit, he had already done stage three engine conversion from Dragon. Who are well know in SA. This inlcuded balaced crank, weiseco forged balanced pistons and rods, pistons were ceramic coted as well. Custom intake manifold, custom turbo manifold for use with greddy T-78 turbo. Running greddy external wastegate, and running a HKS synchronic BOV. He also had custom titanium valve spring retainers, as we all know 20 V heads dont like to rev. Plus some performance cams from Dragon, I don't know what their duration was. All this was run using factory ecu with a Dastech uni chip.
He also had a direct port injection nitrous system good for a 100hp shot.The problem when you start running huge boost in a recirculated system is, it is not released and cause turbo stall. In other words it jams the turbine blades due to over presurerisation. THat is why any big turbo application does not use recerculation BOV's or internal wastegates. Toyota supra 2JZ GTE engine. Std from factory has a recirculating BOV. and internal waste gates on the turbo's. Look at any of the big 1200bhp cars, all of them withour exception will be running external BOV's and external Wastegates for that very reason. It is very easy to remap the engine to stop it looking for the added air, which when you are running huge boost doesn't impact response time of spool up, trust me. It doesn't. The only problem is turbo lag. then again running a big turbo will always give ou that problem. My advice james, talk to the japanese turbo boys. They know their business, and have been working turbos for decades. But it is possible to hit huge power with 1.8T. If you have the time and money.


Here you go 400HP a bit boring but good engine and turbo pics. He is using a biiiig turbo with internal waste gate. It gives you an idea of what is possible though.





450bhp 4 wheel wheels spin, f in wicked. If you listen closely you will here the wategate and BOV
and 490bhp all using external BOV and wastegates

my thread has gone way off topic, LOL. Neways i went for the Forge adjustable, just to let you know lol

Cupra_Wob wrote:

my thread has gone way off topic, LOL. Neways i went for the Forge adjustable, just to let you know lol

THREAD HIJACK!LOL!

Sorry dude, youre right I am just really passionate about big turbo setups! As I am sure you can see from my other post! Your choice is cool for low boost or slightly better that factory, but once you start wanting to hit the 300+ mark then things change big time.

Cheers P

ok, i know im thick!!!

but if i bought that actuator now and bolted it on, what would it do to my car right now? bearing in mind ive got a stage 1 map running 21 psi.?

just to add, i know, im thick

I think its life span will be longer. For stage one apps thats fine, it will also alow you the abilty to adjust the presure at which the wastegate opens where as normal factory ones as far as I know you dont have much room for adjustment if any. So it should alow you to run higher boost with out opening when you dont want it too, causing you to loose boost presure.

ah right! so that in itself wont increase boost pressure, just stop you from loosing it?

how would i know if my actuator is knackered? would i loose boost?


looking for an excuse to buy another shiney thing, basically! also wob have you got a ko3s, does it work with that?


cheers guys! 386 posts and ive just learned something

Not 100% sure I'm afraid the job we did basicaly got rid of the old turbo and manifold. I would assume though forge will list which turbos their actuator will work with. Because you are only byeing the actuator and not the waste gate. On those turbos the actual wastegate is built into the turbo housing and uses a numatic actuator valve to open the gate. So if forge list one of these for the KO3s then yes it will work. Well thats an educated guess! sorry bro!

no probs mate, cheers for the info, was an interesting read

sorry for the hijack wob

Also incase people are wonder the 500bhp single turbo story. Also included head work injectors fueling and alot of other parts, which I omited for abvious reasons.

sparkie1984 wrote:

no probs mate, cheers for the info, was an interesting read

sorry for the hijack wob

No worrys dude anytime! SOrry for the hijack wob!

Lol at the apologies its fine, yes sparkie i got the ko3s fitted, got the specfic one for the turbo, scc are fitting it monday not going to run any more boost just want to put it back up to what it should be not peaking 10psi

lol how much did you get the ko3s for mate? im desperate to get one! then im almost ready for a stage 2

Hey guys, here is a demo that illustrated turbo flutter. Cheers

P

Looner, we have got to sit around a pub table and chat about this .
Good info mate.

Good on you Wob for going for it, we like shiny new parts and from what I can tell, it will allow you increase oppurtuinity to turn your car. As Looner mentions though, the actual wastegate is internal and therefore a little limited in how much PSI it can actually control. I guess we are all beginnning to see that we need bigger turbo's for more power....

and for me more money

Calimori wrote:

Looner, we have got to sit around a pub table and chat about this .
Good info mate.

Good on you Wob for going for it, we like shiny new parts and from what I can tell, it will allow you increase oppurtuinity to turn your car. As Looner mentions though, the actual wastegate is internal and therefore a little limited in how much PSI it can actually control. I guess we are all beginnning to see that we need bigger turbo's for more power....

Anytime Cali, I am always up for talking turbo! LOL! sorry bad I know.

LOL! We all need more money, If had the cash there is one very bad ass audi I would be building. However thats my secret!