Evo X bolt on Garrett GT30R turbos
There's definitely something up. Like I said, my friends car is putting down 350whp@7k (on a dynojet I believe) with only 20.5psi and NO tune.
What's your complete mod list? Does Bryan have a chart showing the boost curve? Also, where is the boost being measured (manifold or compressor outlet)?
Was anything else changed during the turbo swap?
If you're making the proper levels of boost, but the power is way down, then I suspect the issue is elsewhere.
Overall, the turbo is relatively simple in operation, and one going bad doesn't really exhibit the symptoms your car is showing that I'm aware of. Maybe there's an exhaust leak between the mani/head or mani/turbo?
Possible issue with MAF sensor? Compressor inlet elbow on correctly with the o-ring?
What's your complete mod list? Does Bryan have a chart showing the boost curve? Also, where is the boost being measured (manifold or compressor outlet)?
Was anything else changed during the turbo swap?
If you're making the proper levels of boost, but the power is way down, then I suspect the issue is elsewhere.
Overall, the turbo is relatively simple in operation, and one going bad doesn't really exhibit the symptoms your car is showing that I'm aware of. Maybe there's an exhaust leak between the mani/head or mani/turbo?
Possible issue with MAF sensor? Compressor inlet elbow on correctly with the o-ring?
Boost is being measured at the FPR.
Evolving Member
Joined: May 2009
Posts: 114
Likes: 0
From: Spokane, WA
Wonder if something was cracked/warped/stripped during install and you are leaking air from a fitting or mating surface somewhere? Problem seems really odd ... especially to be down in power from the stock turbo like that.
Evolving Member
Joined: Apr 2009
Posts: 143
Likes: 0
From: Leesburg, VA
Good Luck on the build... To all who read this post too!! About modding: It's not "if" itll happen to you, its about "when" itll happen; and i just got mine back this week after being in the shop for another whole week. Once again Good Luck to all of you modding out there!!!
One thing that came to mind to me tonight is that I installed a Forge WGA on the turbo before the install...I also have the GST boost pill installed. So...I'm thinking that the system may be holding too much pressure?
On the drive home from the dyno session the car was surging a lot even at very low boost pressure. I wasn't getting any CELs and the car wasn't misfiring at all. Just a thought, any insight guys?
On the drive home from the dyno session the car was surging a lot even at very low boost pressure. I wasn't getting any CELs and the car wasn't misfiring at all. Just a thought, any insight guys?
One thing that came to mind to me tonight is that I installed a Forge WGA on the turbo before the install...I also have the GST boost pill installed. So...I'm thinking that the system may be holding too much pressure?
On the drive home from the dyno session the car was surging a lot even at very low boost pressure. I wasn't getting any CELs and the car wasn't misfiring at all. Just a thought, any insight guys?
On the drive home from the dyno session the car was surging a lot even at very low boost pressure. I wasn't getting any CELs and the car wasn't misfiring at all. Just a thought, any insight guys?
Hmmm, this is interesting. The boost pill should be a good thing. It should be a larger size so you'll be able to hold more boost up top. You might want to check to see what spring you're using on the Forge or if the preload is strong enough. That might be why you're not holding your boost.
Good Luck on the build... To all who read this post too!! About modding: It's not "if" itll happen to you, its about "when" itll happen; and i just got mine back this week after being in the shop for another whole week. Once again Good Luck to all of you modding out there!!!
Thats the fun part!!! Then I get to upgrade whatever I broke, overheated, cracked, warped, bent, gouged, destroyed, etc... 
Evolving Member
Joined: Mar 2008
Posts: 443
Likes: 0
From: Atlanta Ga.
This isn't a normal 30r. it is a twin scroll built specifically for the Evo X. If the turbo can't hold boost up top then garrett didn't do their job.
Garrett spent a lot of money to produce this turbo seeing that it is car specific and i doubt they let a fact of holding boost up top slip past their R&D team...
They knew the potential of building this turbo and I assure you they weren't going to release a product that wasn't going to live up to the hype.
Garrett spent a lot of money to produce this turbo seeing that it is car specific and i doubt they let a fact of holding boost up top slip past their R&D team...
They knew the potential of building this turbo and I assure you they weren't going to release a product that wasn't going to live up to the hype.
Well, I had some other ideas of what the problem may be...do any of you know if the MAF can be malfunctioning without throwing CELs?
I know this is going to sound stupid...but the MAF housing was dropped on the shop floor while installing a cone filter prior to the dyno. Could this be the possible cause for all of my problems? The car isn't throwing any codes...just acting like the ECU is completely confused.
I know this is going to sound stupid...but the MAF housing was dropped on the shop floor while installing a cone filter prior to the dyno. Could this be the possible cause for all of my problems? The car isn't throwing any codes...just acting like the ECU is completely confused.
Last edited by Boostd4; May 26, 2009 at 09:34 AM.