Colorado S14
10-05-2004, 12:08 AM
I have a Greddy turbo kit on my car and recently installed a SR20 3" DP and a Profec B spec II BC. I now have a serious boost creep issue. My car will rev and I hit 6 psi at 3000 rpm. The car then bogs and feels like it has hit a wall. But then at like 4500 it will take off again but the boost will keep creeping all the way to a scary 13 psi.
I dynoed it today and this shows up dramatically on the dyno chart I loose 25 hp here between 3500 and 4500 rpms. My a/f ratio is a solid 12:1 across the board. I set my base timing back to 20* BTDC and am pulling 8* using the Emanage. This creep happens with and without the Profec B hooked up. What is it? I am going crazy!
I am thinking that the design of the Greddy is a bigger part of the reason for the low numbers people are getting than I used to. I used to think that it cannot be that different from the other kits and the low numbers are due to the terrible settings that GReddy sends the Emanage out with.
This picture does not show it completely but you get the idea, look at how they blocked the wastegate exit and are forcing its flow to go into the exhaust stream at a 90* angle and use the same outlet as the turbine.
http://img.photobucket.com/albums/v98/ColoradoS14/1997%20240SX/IMG_2879.jpg
I have the creep issues with the wastegate hooked up to the hot pipe and when it is hooked up to manifold vacuum, without the boost controller.
Another thing, when it over boosts to like 13.2 psi it does not feel that much stronger then when I was stable at about 6 psi. In fact on the dyno with the boost creeping to 12 psi, I only put down an actual 195 hp at 5500ft of altitude!
I dynoed it today and this shows up dramatically on the dyno chart I loose 25 hp here between 3500 and 4500 rpms. My a/f ratio is a solid 12:1 across the board. I set my base timing back to 20* BTDC and am pulling 8* using the Emanage. This creep happens with and without the Profec B hooked up. What is it? I am going crazy!
I am thinking that the design of the Greddy is a bigger part of the reason for the low numbers people are getting than I used to. I used to think that it cannot be that different from the other kits and the low numbers are due to the terrible settings that GReddy sends the Emanage out with.
This picture does not show it completely but you get the idea, look at how they blocked the wastegate exit and are forcing its flow to go into the exhaust stream at a 90* angle and use the same outlet as the turbine.
http://img.photobucket.com/albums/v98/ColoradoS14/1997%20240SX/IMG_2879.jpg
I have the creep issues with the wastegate hooked up to the hot pipe and when it is hooked up to manifold vacuum, without the boost controller.
Another thing, when it over boosts to like 13.2 psi it does not feel that much stronger then when I was stable at about 6 psi. In fact on the dyno with the boost creeping to 12 psi, I only put down an actual 195 hp at 5500ft of altitude!