View Full Version : Wastegate Question..
'BITZA 1.8T
14-07-2003, 17:39
I've recently heard that i can upgrade the wastegate on the ibiza 20vt..apparantly it makes one hell of a sweet sounding noise and is a lot better for the car.to be honest i dont even know what a wategate is if it smacked me in the fecking head...can anyone give me the low down..do i need to upgrade? do they sound nice? are they easiy to fit? are they expensive? hard to get hold off? thanks..
wastegate is the valve which releases the exhaust gas from the turbo so that it does not boost till the engine blows up. it is controlled by the actuator which is basically a spring which opens under pressure from the turbo. different spring rates mean the actuator will open at different pressures. the N75 valve controlled by the ECU can fool the actuator by bleeding air off from the pipe coming from the turbo.
you cannot upgrade the wastegate, i think you mean DV (diverter valve)
is it welded in on the KKK turbo. mine is welded on my IHI unit. pain in the arse
so a wastegate is not the same as the divertor valve?
when i explained my "flatspot at 4000rpm" problem to RSD they said the wastegate might need some adjustment...
ibizacupra
16-10-2003, 22:41
Originally posted by jerry
so a wastegate is not the same as the divertor valve?
when i explained my "flatspot at 4000rpm" problem to RSD they said the wastegate might need some adjustment...
Danny did the same to mine many moons ago... but that was to help cure overboost spike from the Oettinger chip. Spike went but so did the power :(
so do you think my flatspot is due to an overboost?
is there any cure for this without losing power?
junior munky
16-10-2003, 23:49
Originally posted by jerry
so a wastegate is not the same as the divertor valve?
DV is on the "fresh air" side of the turbo and waste gate on the exhaust side.
The waste gate controls the amount of exhaust gas going into the turbo and therefore the speed it spins at
The dump valve vents the "fresh air" side of the turbo when you take your foot off the accelerator to stop the sudden closed valve in the throttle from stalling the turbo, so you still have boost available when you are changing up gears fast (for example).
junior munky
16-10-2003, 23:51
Oh, unless diverter valve is another name for waste gate ?
ibizacupra
17-10-2003, 08:14
Originally posted by junior munky
Oh, unless diverter valve is another name for waste gate ?
Nope. You were right 1st time. :)
Wastegate is in the turbo on our cars.... actuated by an Actuator!
DV is a Dump Valve, recirculation type.... with connections between turbo outlet (compressor) and turbo inlet (compressor) downstream of the MAF. Its purpose is to recirculate the boost on closed throttle so as to not create a pressure surge, where the turbo is still spooled up and you shut the throttle. Lots of pressure and nowhere to go can cause (or try to) compressor stall. Its more wear and tear on the turbo having to cope with these pressure back surges hence fitting the DV.
salamanzer
22-10-2003, 19:04
you can replace the wastegate - but that would require changing the manifold.
But doing just the manifold would be pointless - because you replace the wastegate for an external type to reduce back pressure caused by the internal wastegate. So that would also mean replacing the turbo!
I do agree and nice external wastegate does sound nice. esp a bit of wastegate chatter ;)
As for a Dump valve - i would recommend keeping a recirculating type - this will keep a good turbo spool up as well as preventing a rough idle because the air is not being recirculated.
J
does the 'N75' valve not control the wastegate? maybe thats what he was told could be upgraded?
or am i talkin crap?!!
Mark:confused:
ibizacupra
22-10-2003, 22:24
Originally posted by mk4polo
does the 'N75' valve not control the wastegate? maybe thats what he was told could be upgraded?
or am i talkin crap?!!
Mark:confused:
Yep. N75 is the frequency valve which controls (via ecu) requested boost.
Some models of N75 are reported to give better response or power.... (for the life of me I know of no reason tho)
Bill
Seat Apprentice
23-10-2003, 21:04
Originally posted by ibizacupra
Yep. N75 is the frequency valve which controls (via ecu) requested boost.
Some models of N75 are reported to give better response or power.... (for the life of me I know of no reason tho)
Bill
might be summink to do with the fact some of the valves are known to fail so obviously they are of poor manufacture:D
ibizacupra
23-10-2003, 21:23
Originally posted by Seat Apprentice
might be summink to do with the fact some of the valves are known to fail so obviously they are of poor manufacture:D
Orifice hole diameter seems to be a difference if I understood some peoples posts correctly..
It will effectively limit the ability to bleed pressure if smaller for example.