ProjectGS#2: NA-T Build in 24 hours.
08-01-10, 08:12 AM
#77
ok Jeff, we are all waiting, throw us numbers ? im ready to drop off my GS, not far from ya buddy!
however in my case throw in the numbers w/tranny, ya with 210k miles i might need to beef up my tranny !
however in my case throw in the numbers w/tranny, ya with 210k miles i might need to beef up my tranny !
08-01-10, 09:12 AM
#78
I'd say its around 300rwhp, but I haven't been able to push it all the way. The reason I say it's around 300rwhp is because the stock injectors can handle around 260whp or so before maxing out. I'm already maxing out the injectors and leaning out up top so that leads me to believe I'm near 300. That was the goal for this project anyway, low boost around 7psi and run right at 300whp.
I'm getting a new set of injectors and going to give it another go once those are installed. For now, I can't floor it unless I want to risk damaging my engine. For now, I still drive it around town since it's still my daily and I try staying out of boost.
I'm getting a new set of injectors and going to give it another go once those are installed. For now, I can't floor it unless I want to risk damaging my engine. For now, I still drive it around town since it's still my daily and I try staying out of boost.
08-02-10, 08:22 AM
#82
Stock injectors can handle 300rwhp if you run a high ratio rising rate fuel pressure regulator. However that will also require running a return line and fittings. Add all of that up and you're looking at almost $300 or so. The better way is to just get a larger set of 550cc injectors and leave the fuel lines stock. Going the route of bigger injectors opens you up to the opportunity to make more power in the future.
08-13-10, 12:41 AM
#84
Sorry was busy for the past week or so. Didn't have much time to update the post. Right now, I'm running the turbo setup with no CEL! Going to go in for state inspection/emissions testing sometime next week. I think I'll pass 
Here's just some pictures of the downpipe and midpipe I fabricated.
Built the front half and used the OEM rear half of the midpipe. I wanted to retain use of the factory 3rd cat. This keeps the exhaust smells at a minimum when sitting and idling in traffic. There was a ton of rust on the factory midpipe and I had to grind it all off lol.
Shot of the midpipe on the car.
Where the midpipe connects to the downpipe. You can also see the wastegate and dump tube in this picture.
View from top down of the downpipe from where it exits the turbo.
Here's just some pictures of the downpipe and midpipe I fabricated.
Built the front half and used the OEM rear half of the midpipe. I wanted to retain use of the factory 3rd cat. This keeps the exhaust smells at a minimum when sitting and idling in traffic. There was a ton of rust on the factory midpipe and I had to grind it all off lol.
Shot of the midpipe on the car.
Where the midpipe connects to the downpipe. You can also see the wastegate and dump tube in this picture.
View from top down of the downpipe from where it exits the turbo.
08-13-10, 01:22 AM
#85
Nice work on the midpipe. Looks very clean.
However, I am 100% I do not have that 3rd cat under my GS3. I have seen it on a German GS3, but mine does not have it. Instead of the cat mine has a resonator.
Is there a difference between the 98-00 models and the 01-05 models? I know the header isn't exactly the same design. Which would be better to have on the car?
However, I am 100% I do not have that 3rd cat under my GS3. I have seen it on a German GS3, but mine does not have it. Instead of the cat mine has a resonator.
Is there a difference between the 98-00 models and the 01-05 models? I know the header isn't exactly the same design. Which would be better to have on the car?
08-13-10, 12:43 PM
#88
Stock injectors can handle 300rwhp if you run a high ratio rising rate fuel pressure regulator. However that will also require running a return line and fittings. Add all of that up and you're looking at almost $300 or so. The better way is to just get a larger set of 550cc injectors and leave the fuel lines stock. Going the route of bigger injectors opens you up to the opportunity to make more power in the future.
Aren't you putting the cart in front of the horse?
BTW - nice work
08-13-10, 03:11 PM
#90
I'm nowhere near your knowledge, but I have to fundamentally disagree. Running fuel lines with a rising rate fuel regulator is the foundation will allow you to add injectors, fuel management, etc., later and while you’re currently around 300hp. The 550cc injectors alone with cause you to run rich.
Aren't you putting the cart in front of the horse?
BTW - nice work
Aren't you putting the cart in front of the horse?
BTW - nice work
So if you have a set of 550cc injectors and run them at 35psi rail pressure, then you end up with a set of 450cc injectors. Basically I'm putting in larger injectors to compensate for the drop of fuel pressure. Of course this only works up to a certain point, if your rail pressure drops too low then the fuel will not atomize properly and the car will run like crap. People put a rising rate FPR to combat this pressure drop. So, to keep 550cc injectors flowing at 550cc then you will need to have a rail pressure of 51psi when running 8psi boost in the intake manifold. That's what a 1:1 ratio FPR does. For every 1psi rise in the intake manifold pressure, it will increase rail pressure by the same amount
So, for low power just keep the stock rail and get some bigger injectors if you have issues of leaning out up in the top of the rpm range. Also, I'm not just throwing in bigger injectors and calling it a day. I have to retune the ecu to run them properly.
Here's a video of me doing some testing and pulls at 5psi of boost. I'm going to raise it to 8psi next week when I get my new wastegate in.
EDIT: I just wanted to say....THERE'S NO CHECK ENGINE LIGHT!!!!
http://www.youtube.com/watch?v=RrqOnIp4aIQ
Last edited by JeffTsai; 08-13-10 at 03:19 PM.