Has anybody done a sr55 with a external waste gate setup?

I know a guy that has that exact setup... and I wouldn't bother with the SR55. That turbo is not the most responsive.

Look at the last graph in the first post here:
http://forums.nasioc.com/forums/showthread.php?t=937194

I have heard that turbo is very overratted. If you want a 55lb/min turbo i would go for the SZ55. The SR55 spools slower and it doesn't have as much top-end.

Well as an SR55 owner, I won't say that there arent other good setups, but I will say that the SR55 is a great turbo that will run well only if tuned correctly. My car put down 386 whp and 375 wtq @ 21 psi on 93 octane. For the record, my everyday driving map is running 11 psi and put down 311 whp and 282 wtq. Go to xxtuning.com and check out there dyno base. There are guys putting down over 400 whp on an SR55 at only 21-22 psi and 93 octane. The spool up is also excellent coming in before 4k, in some cases around 3700 rpm. I myself have been professionally tuned on this dyno and can vouch for the spool and power numbers. My stage two setup which put down 300 whp and 324 wtq netted me a 12.9 @ 108 at e-town. Sorry I got off track, but as far as an external gate goes on the SR55, I dont really know of the benifits, and I can say that the stock wastegate is good to hold boost as low as 11 psi and as high as over 30.

I myself am one of the SR55 equipt subies done by XX Tuning. I would say yes go EWG with the SR55. It will let you control your boost better above 25PSI. To be honest just talk to either Jack or Tony from XX and they will point you in the right direction.

For the record, I was .7WHP away from 400, 399.3WHP and 404WTQ. Final tune turned out 398WHP and 425WTQ after 15 dyno pulls, yup Tony did some work that day.

As for defending the SR55, I don't have too! My car speaks volumes about the SR55 abilities. Slow spool? I think 420WTQ at 4000RPM is preaty darn good.

http://x11.putfile.com/1/1721235130.jpg

Defiantspaz are you tuned with an EWG? If so did you weld the stock wastegate shut and what type of WG are you using? Oh and also, when is the next meet at Mohegan Sun, Id like to come if I have time.

This is the best spooling and highest horsepower i have EVER seen out of a SR55. Those charts look pretty nice. Race gas helps out quite a bit with the spool too.

from http://forums.nasioc.com/forums/showthread.php?t=937194 ...
On pump 92 octane with no water injection, the car made 411whp and 389 lb-ft of torque. This was with 21-22psi of boost, and typical 92 octane AFRs of 11.1-11.4.

....

We also tuned another customer car that had an APS SR55, so I plotted the pump gas comparison below. The SR55 ran well, but had WORSE spoolup and low end torque then the GT30R, and the 30R was with a .82 housing! As you can see from the graph, the APS made about 360whp compared to 411 on the Perrin GT30. The APS made the most power at about 22psi, but the difference in power from 18-22 was not that significant. Given the price of the APS turbo, I just don’t see it delivering compared to a real Garrett designed housing.

http://www.pdxtuning.com/nasioc/GT30-52lb-VSSR55.jpg

....

Keep in mind this the the 52lb GT30R, not the 65lb/min -14, or the GT35R. Needless to say, the Garrett engineering housing do very with, almost like they were engineered by a turbocharger company. ;) ;)

Just to make a comment, the cars tuned at xx tuning are tuned on a dynapack dyno which may account for the numbers being so high. If i also remember correctly there was a huge post/diary on either here or iwsti of a guy using an sr series turbo and not being able to make power, aps even went as far as having him buy a whole new setup and the turbo ended up creeping really bad so aps themselves worked it and they ended up buying the whole setup back from the customer when it didn't perform.

Before I start I will apologize for the links and not just pictures, the insert image tab isn't working for me today.

Ok, everyone on NASIOC seems to like the SZ55 over the SR55. It comes down to personal prefference. Both turbos make good power if tuned correctly.

A dyno plot of an STI that was tuned by both Tony at XX Tuning and Doug from Topspeed on the very same dyno. Doug worked his magic to get the exact same results as Tony did. The SZ55 did spool up faster than the SR55 but not by that much. SZ55 STI's mods: Deadbolt SZ55, APS DR725 FMIC, PE 850\'s, APS CAI, Cobb Catless Downpipe, Cobb Catback, HKS EVC 2 Boost Controller, Ecutek tuned to 21.5 psi on 93 octane: http://www.xxtuning.com/dynocharts/image2.php?Car1=178&Car2=0

A plot of an STI that was tuned by Tony at XX. New version SR55 STI's mods: APS SR55, Hyperflow Monster FMIC, Perrin Modded Injectors, XXTuning Header, APS 3.5 inch TBE, Perrin BigMAF, ECUTEK tuned to 22 psi on 93 octane: http://www.xxtuning.com/dynocharts/image2.php?Car1=177&Car2=0

An overlay of the SZ55(blue) and the SR55(red): http://www.xxtuning.com/dynocharts/image2.php?Car1=177&Car2=178

Here is the plot of my car with an older version SR55. My mods: APS SR55, APS DR725 FMIC, APS CAI, APS 3.5inch TBE, XXTuning Header, PE 850 injectors, XXTuning Fuel Rails, Cobb AccessPORT ProTuned to 22 psi on 93 Octane: http://www.xxtuning.com/dynocharts/image2.php?Car1=163&Car2=0

An overlay of the newer version SR55(blue) and my older version SR55(red): http://www.xxtuning.com/dynocharts/image2.php?Car1=163&Car2=177

An overlay of the SZ55(blue) and my older version SR55(red): http://www.xxtuning.com/dynocharts/image2.php?Car1=163&Car2=178

As you can see from the last plot the SZ55 does spool up quite a bit faster than the older SR55, but overall power from both turbos is very similiar.

Defiantspaz are you tuned with an EWG? If so did you weld the stock wastegate shut and what type of WG are you using? Oh and also, when is the next meet at Mohegan Sun, Id like to come if I have time.

April 2cnd is the first Mohegan sun meet. I will be there but my STI will not. It is at XX Tuning right now getting a complete work over, all kinds of new toys :devil:

I am not running an EWG as of this time, but I am switching to one before the car is done. I am going with a Tial 44mm atmosphiric venting wastegate.

I look forward to meeting you at the Mohegan meet, see you then.

Just to make a comment, the cars tuned at xx tuning are tuned on a dynapack dyno which may account for the numbers being so high. If i also remember correctly there was a huge post/diary on either here or iwsti of a guy using an sr series turbo and not being able to make power, aps even went as far as having him buy a whole new setup and the turbo ended up creeping really bad so aps themselves worked it and they ended up buying the whole setup back from the customer when it didn't perform.

Uhh, never mind.

Those are some nice charts!.. Thanks for posting those. Yeah it does seem pretty close between those turbos. I'm pretyty sure either way you can't go wrong, just comes down to personal preference; the SR55 does look a whole lot better though i will definately give it that.

I will be installing my tial 38mm external this weekend and getting tuned soon after, so I will share my results soon. as for spool I can say it is not that laggy at all but I guess that is subjective. on my datalogs on the Hydra I am getting full boost 20 psi at 3600 in 5th gear on a jdm 6 speed. I will take some logs and post them with the dyno plots. but so far I have ran a 12.0 @116 on 91 pump with a good base map. in my opinion it is a really good choice for a turbo.

Thanks for the feed back, my car will be tuned 4/8/06 @ turboxs I will let you know what kind of #'s I see, I spoke with the owner of mzm and there is a way to go ewg without welding the flapper shut, you just need a bolt and some nuts, I will be going in that direction when a certain company I can't say comes out with there ewg setup soon, it going to be nasty.