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Old 07-09-2012, 11:05 AM   #1
04blustidbish516
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Default 04 Sti external wastegate. What product to go with????

I have a 2004 s with turbo xs front mount, turbo xs exhaust, ad downpipe. Looking to go external wastegate witch I no turbo xs offers an uppipe for it. Lookin to go 44mm has anyone else has external wastegate not off the turbo???? Let me no your opinions on witch way to go. Thanks!!!
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Old 07-09-2012, 11:10 AM   #2
CatfaceType-R
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We have found this isn't a really worthwhile mod, until you are really going for every tenth of a second/hundredth on the stock turbo; the internal gate has no problem keeping up


many options though...
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Old 07-10-2012, 08:35 AM   #3
04blustidbish516
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Just love the way it sounds. What other option you guys use?
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Old 07-12-2012, 12:36 AM   #4
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My personal preference is the Grimmspeed coated EWG uppipe, the Tial 38mm gate and the Grimmspeed stock turbo wastegate block off bracket. The Grimmspeed pipe will come with the dump tube and it is all V-band as well, which is super nice as you do not have to deal with the gaskets. Just remember to get the lower and upper uppipe gaskets and you will be all set.

Thanks!
Rick
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Old 07-12-2012, 12:55 AM   #5
lukeskywrx
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Quote:
Originally Posted by soon2bblackongold View Post
We have found this isn't a really worthwhile mod, until you are really going for every tenth of a second/hundredth on the stock turbo; the internal gate has no problem keeping up


many options though...
It helps spoolup, improves top end and makes more torque. makes the car feel very peppy and responsive.

Here is what an EWG did to my spoolup on a vf43


But I reroute my dump into the exhaust, all the fun without the noise
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Old 07-12-2012, 06:47 AM   #6
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Just love the way it sounds.
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Old 07-12-2012, 08:36 AM   #7
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Quote:
Originally Posted by lukeskywrx View Post
It helps spoolup, improves top end and makes more torque. makes the car feel very peppy and responsive.
]

cool, I had one too. I know of the gains, it's not worth the cost, unless you are going for every tenth...as I said. If u followed the stock turbo 1/4mile attack, you would know that people with iwg run almost as fast, and kiss(keep it simple stupid) is apparently overlooked for the 'sound'

The mbc vs ebc(most people use mbc with ewg for simplicity) causes a decent amout of that great throttle response feeling. Aka with a larger uppipe than stock and a manual boost controller, u will feel almost identical gains.

all the best,

c
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Old 07-12-2012, 10:01 AM   #8
tcooper
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I have one on my TD04 saabaru. The only reason I got it is that I only paid 350$ for the the whole set up and TGV deletes so I could not say no. I have the grimmspeed up, 38mm tial, and a 1 bar spring in it. Its the old 2 bolt set up. I love mine. Plus its fun to blow past people when they have their windows down. I would not have gotten it if i had to pay the retail price for it.

I am soon going to a VF48 on the 2.0. So hopefully it will help me out with spool. I am most likely going to switch to an 18 pound spring just to help spool faster.
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Old 12-09-2012, 02:10 PM   #9
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Quote:
Originally Posted by lukeskywrx View Post
It helps spoolup, improves top end and makes more torque. makes the car feel very peppy and responsive.

But I reroute my dump into the exhaust, all the fun without the noise
This was posted 3/14/05 by member/Vendor "Kingpin". According to his experience you are giving back half your gains by reintroducing your EWG back into your exhaust.

Recently I have been flooded with calls and emails about the effects of adding an external gate. I have decided to make a post explaining what I have found and why I believe this works. As many of you know we do not operate on a secret Business model. We do not see other shops as our competition and we share our findings.

On larger turbo setups we are finding 20-40whp by adding an external gate to an existing turbo setup. I have now tuned a host of cars that where before and after tests and I have tuned many cars using a various turbos so I can apply how I tuned those cars to how I tune these cars with external gates.

Some examples...

STI with Green. Added Custom Tial 38mm and retuned. Car gained 30whp on pump gas and 45 whp on C16.

02 WRX with 20G. Car gained 20whp on pump gas and 35whp on C16.

Your results will vary and keep in mind that the added power did not come without a retune.

Somethings I have found:

You will use more fuel with the Ex gate. Where 650's where enough 800s are probably needed with the Ex gate. This stopped a recent customer from making alot of power. He had UR650's which ran 100% duty at 18 psi on a green/EJ205 setup with Ex gate. Car pulled real hard but I had to detune it for safety until he gets the 800's.

You will run much less timing advance which is a good thing. We are finding that the optimal timing is 4-6 degrees less then internal gates on most turbos. This is because the EGR effect of having high back pressure between the ports and the turbine is reduced and because overall airflow is more. More air moving through the motor requires less timing advance.

Which brings me to a subject on engine load and timing advance. To a bottom end T advance is the devil The more advance the higher the load on the bottom end. In cyl pressures skyrocket and p out slowly increases. I have posted links in the past to aircraft engine tests to help explain how this works and why.

In tuning we see these effects all the time. We tune the car to a nice safe smooth power curve and then advance timing up in 1 degree steps and note the results. If I dont see 5-7whp for 1 degree of advance I stop. I might have the option of going to 3-4 degrees to get 15whp but that extra 15 whp probably shot the in cyl pressures up 20% base on graphs I have for engines tested with pressure sensors. One point I want to make is that its possible to make more power with much less stress on the bottom end of the motor with an Ex gate and proper tuning.

The flow requirement of the downpipe and catback exhaust is now Way less because the gate is dumping to the atmosphere. Not as much exhaust is being forced into the housing before venting and its not having to do a right turn to get out of the internal gate. This is why we make well over 500whp with an off the shelf noiseless Greddy EVO2 catback.

Plumbing the Ex gate back into the DP typicaly loses 10-20whp and increases the flow through the DP and catback. In doing this you create a pressure differential across the gate and you are asking two different speed and temp exhaust streams to mesh into one and flow out the tailpipe. Generaly a bad idea.

The thread is here under General > Newbies& FAQ's

Last edited by bossdog; 12-09-2012 at 02:46 PM.
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