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Engine Specific Info and Questions => IDI Engine => Topic started by: Benjamin on October 21, 2006, 05:13:12 pm

Title: external wastegate (idi-vnt related)
Post by: Benjamin on October 21, 2006, 05:13:12 pm

in folowing of the VNT topic.
you need a external wastegate to control the boost on a IDI. (correct me if i'm wrong)

i was searching http://www.motors.ebay.com/ a bit.
i found very cheap external wastegates
http://cgi.ebay.com/ebaymotors/35mm-DSM-JDM-TURBO-EXTERNAL-Wastegate-Kit-8Psi_W0QQitemZ290040052189QQihZ019QQcategoryZ33742QQrdZ1QQcmdZViewItem

http://cgi.ebay.com/ebaymotors/35MM-EXTERNAL-WASTEGATE-8PSI-JDM-2bolt-Turbo-GREDDY_W0QQitemZ260041629881QQihZ016QQcategoryZ33742QQrdZ1QQcmdZViewItem

they are stock 8psi, low boost. with a stronger spring it can give you the right boost, but can this low budget wastegate also take this high pressures up to 30psi??? i thought maybe they should brake?
any expierience?

what do you think of this one?
http://cgi.ebay.com/ebaymotors/SKYLINE-VL-TURBO-T3-EXTERNAL-WASTEGATE-ADAPTER-RB25_W0QQitemZ150046742497QQihZ005QQcategoryZ33742QQrdZ1QQcmdZViewItem
this is my own project for it (unfinished)
(http://img220.imageshack.us/img220/4079/pict0120dr3.jpg) (http://imageshack.us)

Greetz, Benjamin

Title: external wastegate (idi-vnt related)
Post by: rabbid79 on October 21, 2006, 05:25:02 pm

I'm not certain you need a wastegate to control the boost on a VNT turbo.  I think a lot of it probably has to do with how the VNT mechanism is adjusted, and other variables.  I put a VNT-17 on my 1.5, and unlike the VNT topic you're referring to, my turbo only builds about 5 pounds of boost when the vanes are completely open.  That tells me that there's a lot of head-room built into it for controlling the amount of boost.

That's just been my experience though.  Perhaps with a VNT-15 on a 1.6 it completely different.

Title: external wastegate (idi-vnt related)
Post by: Audi80 on October 21, 2006, 05:50:53 pm

No, you won´t need a wastegate. Just correct adjustments to vane mechanism. I´m using a VNT20 vacuum can with flipped internals (boost controlled) It works pretty good to me.

Title: external wastegate (idi-vnt related)
Post by: Benjamin on October 22, 2006, 03:59:47 am

@Audi80: how much boost are you running, how high are your peaks?
if the boost peaks to high you producing hot air, isnt?

its maybe a stupid question, can you make more power with an external wastegate?

Greetz, Benjamin

Title: external wastegate (idi-vnt related)
Post by: Audi80 on October 23, 2006, 05:10:33 am

I´m running 1,6-1,7bar (23-25psi) boost, no peaks higher.
If you limit the boost with vane control, where do you need a wastegate?