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wastegate setup for gt40 on the street


MitchooO
knows how to break em
1972/2000


Galant VR-4 org Post #: 848665 posted 11/10/09 06:22 PM     Remind Me!  Send Private Message   Edit Post      
hey guys i am getting ready to finally put everything back together the way i wanted it on the vr4, built bottom end with a good head and valvetrain, im going to be running a GT4094r on a big ol top mount,850 inj for now to get it on the road on 15-18 lbs. and a set of 272 or 280 cams, i havent bought them yet. the manifold has a big round v band flange, looks like a 44 or a 50? ive never owned anything bigger than a 2 bolt 38mm so i dont know wat im going to need to control this thing, i was going to re weld a few things on it and run dual 38's but if i can id just like to run one big one, are their any advantages/disadvantages over either setup, anyone else running this big of a turbo on the street with either wg setup? i can post some pics of the setup if it may help, thanks alot for your info guys



If its not white. The owners not too Bright.
1972/2000- Wallet Nightmare with too big of a turbo
81 Toyota Starlet- long time search found for 500 bucks
93 Civic- Been in the family over 10 years. SOHC turbo beaten on everyday of its life



Posts: 350 | From: South Mountain, PA | Member Since: 10/10/07 | IP: (67.234.147.216) | Report this post to a Moderator

Rausch Galant VR4.org Moderator
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Galant VR-4 org Post #: 848677 posted 11/10/09 06:29 PM     Remind Me!  Send Private Message   Edit Post      
Lower boost = bigger gate.

The gate has to pass more volume to maintain lower boost levels. Keep in mind that if you have a large gate and are trying to run higher boost levels later, you may run into some hang-ups.



Rance lives here...
Founder of Sold out to BMW Cru, then sold out there too.


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ryno529
Unregistered


Galant VR-4 org Post #: 848710 posted 11/10/09 08:15 PM     Remind Me!  Send Private Message   Edit Post      
The tial 44mm will be fine for your application. It is true a smaller gate will control higher boost levels better, but we have run a lot of larger turbos on a single 44mm.We just ran a 44mm on a BorgWarner S366 ETT we originally tuned it on 24 psi and now it is tuned at 34 psi on the same gate with no issues.You might want to also take a look at the new precision 46mm gate. It is a little more money but you get all the springs with it.

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bazeng
work in progress


Galant VR-4 org Post #: 848711 posted 11/10/09 08:17 PM     Remind Me!  Send Private Message   Edit Post      
44mm here.

It'll run just like any other external gate.
What controller do you plan to use? or will you be keeping it mechanical?



Australia's Slowest VR4

Posts: 2520 | From: Melbourne, Australia | Member Since: 02/06/03 | IP: (114.76.37.134) | Report this post to a Moderator

MitchooO
knows how to break em
1972/2000


Galant VR-4 org Post #: 848821 posted 11/11/09 06:31 AM     Remind Me!  Send Private Message   Edit Post   
i have the greddy profec b and i was probly going to try running a little less but if it will stick at about 20-25lbs. i guess ill get it tuned for that!



If its not white. The owners not too Bright.
1972/2000- Wallet Nightmare with too big of a turbo
81 Toyota Starlet- long time search found for 500 bucks
93 Civic- Been in the family over 10 years. SOHC turbo beaten on everyday of its life




Edited by MitchooO (11/13/09 06:09 PM)

Posts: 350 | From: South Mountain, PA | Member Since: 10/10/07 | IP: (67.234.147.216) | Report this post to a Moderator


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