External Wastegate
15 April 2014, 07:13 AM
#1
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External Wastegate
Hi All,
Recently I gave myself a little project which as per the title was to go external wastegate. I know it isnt nessecary with the turbo I have (Greddy T518Z), was just as I like to keep busy haha
.
Question I have, is it seems like the external wastegate is constantly open a tiny bit, can feel a little bit of air coming out the screamer pipe and it sounds a bit loud and blowy even on idle, if that makes sense.
The wastegate is linked up to the 3 port boost solenoid as per photo below, I am wondering if my current map setup has wastegate duty on it, will this be causing it to open a tiny bit? the vacuum like?
Any info greatly appreciated as I'm supposed to be going for a map tweak Friday for my new turbo and headers etc...
Recently I gave myself a little project which as per the title was to go external wastegate. I know it isnt nessecary with the turbo I have (Greddy T518Z), was just as I like to keep busy haha
. Question I have, is it seems like the external wastegate is constantly open a tiny bit, can feel a little bit of air coming out the screamer pipe and it sounds a bit loud and blowy even on idle, if that makes sense.
The wastegate is linked up to the 3 port boost solenoid as per photo below, I am wondering if my current map setup has wastegate duty on it, will this be causing it to open a tiny bit? the vacuum like?
Any info greatly appreciated as I'm supposed to be going for a map tweak Friday for my new turbo and headers etc...
Last edited by SAM-UK300; 15 April 2014 at 07:20 AM.
15 April 2014, 07:54 AM
#2
The issues you are having related to the external gate making a lot of noise on idle is a standard feature on the external wastegate, there is no escaping it. Thats why not so many run one due to the excess noise created giving the car that blowing flexi joint sound.
15 April 2014, 08:13 AM
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Its a Tial , Called a MV 38 or something? cheers fella, just dont want to get to mappers Friday and they say sorry mate cant map this its blowing like F*** haha.
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15 April 2014, 10:11 AM
#13
I noticed this with my tial 44mvr, there is a considerable amount of gasses coming through, probably enough to reduce spool up significantly as well, im a little worried about it tbh because i only have 2 litres to spool a gt30r so i need all the spool properties i can get
15 April 2014, 10:15 AM
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15 April 2014, 10:16 AM
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Oh, and as per my original question, its nothing to do with wastegate duty then? where it was previously set up for a VF35, I believe I remember the mapper saying something like "the duty is at 55" if that means something to someone?
15 April 2014, 10:53 AM
#16
I am running an electronic boost controller on my EWG on the starlet, and i have to programme it for the EWG as opposed to an internal actuator type.
I am unsure what happens when i do this but In need to go through some dip switches to make it run the EWG.
Could there be something in the map that needs tweaking on the boost control side to set the solenoid up for this?
I am unsure what happens when i do this but In need to go through some dip switches to make it run the EWG.
Could there be something in the map that needs tweaking on the boost control side to set the solenoid up for this?
15 April 2014, 11:03 AM
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I have a Greddy Profec B boost controller from one of my old cars sitting here doing nothing, maybe I could try wiring that in and see if changing settings etc stops the blowing?
15 April 2014, 11:47 AM
#21
15 April 2014, 11:49 AM
#22
Usually underneath or in the back of the unit or something there will be a dipswitch for EWG/AC and you have to select what one you are using.
http://www.supracentral.com/foundati..._ii_manual.pdf
See page 4 for what I mean
http://www.supracentral.com/foundati..._ii_manual.pdf
See page 4 for what I mean
15 April 2014, 02:12 PM
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After some MORE reading, apparently the wastegate duty should be set at zero for external wastegates... I am hoping this is the reason mine is currently leaking a little as it is at 55 duty at the moment from previous map. I'm hoping the mapper will sort it Friday
15 April 2014, 02:14 PM
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Hmm 
if I run at spring pressure and bypass the 3 port solenoid for now then that should close it as no duty? just go straight from compressor housing to bottom valve on wastegate. I'm going to try that this afternoon, will report back incase somebody else reads this int he future haha.
if I run at spring pressure and bypass the 3 port solenoid for now then that should close it as no duty? just go straight from compressor housing to bottom valve on wastegate. I'm going to try that this afternoon, will report back incase somebody else reads this int he future haha.
15 April 2014, 02:20 PM
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Gonna try that, at least if that works I know the wastegate is ok etc and none of my joints are leaking and it can be fixed by map 
If not then back to square one haha!
If not then back to square one haha!