Now heres the question I was told it has a 6psi wastegate spring (Internal) I am going to want to run more than 6psi for sure (after motor break in of coarse) and I have heard different opinions some say that means I can run UP TO 6psi and I have also heard I can ONLY run 6psi AND UP. Now if I need a bigger spring where do I get one from?
#107507, "RE: Identified turbo now I need to get some info on it" In response to Reply # 0
Sigh...
Read up on wastegates man.
The spring pressure on a WG means that is when the flapper/valve opens allowing exhaust gas to bypass the turbine wheel. So a 6 psi spring means the WG opens when boost pressure reaches 6 psi and additional exhaust pressure is bypassed.
Using a boost controller prevents boost pressure from reaching the WG actuator/valve until the pressure overcomes the controller and then opens the wastegate.
#107508, "RE: Identified turbo now I need to get some info on it" In response to Reply # 1
Originally posted by CODE4 Sigh... Read up on wastegates man. The spring pressure on a WG means that is when the flapper/valve opens allowing exhaust gas to bypass the turbine wheel. So a 6 psi spring means the WG opens when boost pressure reaches 6 psi and additional exhaust pressure is bypassed. Using a boost controller prevents boost pressure from reaching the WG actuator/valve until the pressure overcomes the controller and then opens the wastegate.
/ME feels like a BANME! now. That makes sense. Thats why you have to have that vacuum line attached to the wastegate without a boost controller so you dont spike.
#107509, "RE: Identified turbo now I need to get some info on it" In response to Reply # 2
Yea, Dave explained it well above.
Keep in mind that with low pressure internal wastegate springs like the one you have, even with the use of a boost controller it is common that you will not be able to increase boost much above the spring level. This is because exaust gas will literally force open the wastegate flapper prematurely.
This happened to me. I was running Hahns 8psi internal wastegate, and even with the use of a high quality MBC (Joe P Pro Z) I was not able to hold more than 10psi of boost through to redline.
1999 Eclipse GS Built motor Hahn 16G Turbo w/ FMIC Hahn Stage 5 Portfueler (270's & 500's) Zeitronix Zt-2 wideband w/ 3.5bar MAP 3" SS Turbo Back CM Stage 4 Clutch and Fidanza Flywheel Baer Big Brake Kit
#107510, "RE: Identified turbo now I need to get some info on it" In response to Reply # 3
Originally posted by Ebster1085 Yea, Dave explained it well above. Keep in mind that with low pressure internal wastegate springs like the one you have, even with the use of a boost controller it is common that you will not be able to increase boost much above the spring level. This is because exaust gas will literally force open the wastegate flapper prematurely. This happened to me. I was running Hahns 8psi internal wastegate, and even with the use of a high quality MBC (Joe P Pro Z) I was not able to hold more than 10psi of boost through to redline.
See and I keep getting answers like this. So should I just upgrade the spring?
#107511, "RE: Identified turbo now I need to get some info on it" In response to Reply # 4
Why not get it all bolted up and running first and see where you are at then. If you cant hold a desireable boost level with the wastegate you have and an MBC, then consider getting a new spring. Until then, dont jump to any conclusions. I was just giving you fair warning.
#107516, "RE: Identified turbo now I need to get some info on it" In response to Reply # 4
Originally posted by TuxdreamerxSee and I keep getting answers like this. So should I just upgrade the spring?
If you have an internal wastegate, you probably won't be able to change the spring. You'll simply have to purchase a new wastegate, if they're even available. I agree with Ebster, install the turbo as is and see where that gets you.
#107518, "RE: Identified turbo now I need to get some info on it" In response to Reply # 7
I used this turbo for 3 years with a manual boost control along with the internal wastegate and actuator that came with the turbo. I kept the manual boost controller set at 18psi and could hit it consistantly. Maybe I just had good luck but it worked for me without changing the actuator.
#107520, "RE: Identified turbo now I need to get some info on it" In response to Reply # 8
Originally posted by scorplon81 I used this turbo for 3 years with a manual boost control along with the internal wastegate and actuator that came with the turbo. I kept the manual boost controller set at 18psi and could hit it consistantly. Maybe I just had good luck but it worked for me without changing the actuator.
Cool, Eventually after break in and all I would like to take it up to the 18-20psi range. Just glad to hear someone elses experience with this turbo.
#107523, "RE: Identified turbo now I need to get some info on it" In response to Reply # 10
Ya, running at 18psi on mine was way off the compressor map when plotted. Plus it spooled so fast I had no traction in lower gears, I had to back off the throttle a lot to keep from spinning tires. Ultimately thats why I ended up getting a new bigger turbo.
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