Divided Wastegate issue
Jul 9, 2012, 10:34 PM
#1
Divided Wastegate issue
MODS... PLEASE LET ME KNOW IF THIS IS IN THE RIGHT SECTION!!!
Well I finished the setup in March and since I have to get the car ready for the shootout... It is time I address the issues.
I habe 2 Tial MVS wastegates on my forward facing FP Black setup. When putting the setup together, I decided to put my wastegate springs at 24.99psi... so I used the Black, yellow, and blue springs as per the sheet Tial provided. (now hear me out on all this)
I put the car on the dyno and noticed that there was an issue. The turbo would hit an instant 30psi and run lean (as it should). My tuner took the boost controller off just to run the wastegates alone and we were getting the same issue. He told me to take the car off the dyno and take a spring out. I took the black spring out and left the blue and yellow. Those 2 springs were supposed to be 15psi I believe. It wound up being too late to throw the car back on the dyno... so we had to street tune the car.
We start to street tune the car and we noticed the same spike at 30psi immediately and we knew we had a real issue. We took the wastegates off and attached a leakdown tester to each individually to see when they open up. With the Yellow and Blue spring... it was full opened at 40psi. So we took off the blue spring and left the Yellow spring (.5 bar) in there. We then attached the leakdown tester to the wastegate and noticed that it was fully opened at 19psi.
We began to street tune the car again and out of the .5 bar spring, it was boosting at 19psi. We then hooked up the boost controller (Hallman MBC with wheel) and could only get out 25-26psi. Can anyone help me out in letting me know if I am doing something wrong? I need to get a retune and I want to make sure the car is working properly. I really want to crank up the boost on this turbo.
Any help will be appreciated.
Well I finished the setup in March and since I have to get the car ready for the shootout... It is time I address the issues.
I habe 2 Tial MVS wastegates on my forward facing FP Black setup. When putting the setup together, I decided to put my wastegate springs at 24.99psi... so I used the Black, yellow, and blue springs as per the sheet Tial provided. (now hear me out on all this)
I put the car on the dyno and noticed that there was an issue. The turbo would hit an instant 30psi and run lean (as it should). My tuner took the boost controller off just to run the wastegates alone and we were getting the same issue. He told me to take the car off the dyno and take a spring out. I took the black spring out and left the blue and yellow. Those 2 springs were supposed to be 15psi I believe. It wound up being too late to throw the car back on the dyno... so we had to street tune the car.
We start to street tune the car and we noticed the same spike at 30psi immediately and we knew we had a real issue. We took the wastegates off and attached a leakdown tester to each individually to see when they open up. With the Yellow and Blue spring... it was full opened at 40psi. So we took off the blue spring and left the Yellow spring (.5 bar) in there. We then attached the leakdown tester to the wastegate and noticed that it was fully opened at 19psi.
We began to street tune the car again and out of the .5 bar spring, it was boosting at 19psi. We then hooked up the boost controller (Hallman MBC with wheel) and could only get out 25-26psi. Can anyone help me out in letting me know if I am doing something wrong? I need to get a retune and I want to make sure the car is working properly. I really want to crank up the boost on this turbo.
Any help will be appreciated.
Trending Topics
Jul 10, 2012, 01:51 PM
#8
Evolved Member
Join Date: Jan 2007
Location: MI
Posts: 611
Likes: 0
Received 0 Likes
on
0 Posts
correct, the exhaust gas can not flow directly to the wastegate and when it starts to really move it will bypass the wastegate port pretty much all together
Jul 10, 2012, 01:55 PM
#9
Yup, exhaust flow does not like turning. So having the wastegates placed at a 90 degree angle from the flow makes for very poor wastegate flow/control.
Below is a Cosworth ChampCar engine showing proper wastegate priority:
Basically, you want as shallow of an angle as possible for the wastegate flow coming off the exhaust flow. This ChampCar has zero degrees
Below is a Cosworth ChampCar engine showing proper wastegate priority:
Basically, you want as shallow of an angle as possible for the wastegate flow coming off the exhaust flow. This ChampCar has zero degrees
Jul 11, 2012, 07:48 AM
#12
Ok... Well i just came back from a little drive with my all motor evo. iam uploading a video of one of the short pulls i made. the longer vids wont upload. the boost gauge went to 0 psi... And stayed there each and every time. now what should i do?
Jul 11, 2012, 08:52 AM
#13
Evolved Member
Join Date: Jan 2007
Location: MI
Posts: 611
Likes: 0
Received 0 Likes
on
0 Posts
all the way to redline in 3rd gear?
Jul 11, 2012, 10:30 AM
#14
did two pulls all the way to around 6500... the one i caught a proper video of was only to 4500... but yes.. i did 2 pull pulls to 6500. those were the longest pulls of my life and loud as hell!
Last edited by BOOSTINAT30PSI; Jul 11, 2012 at 10:35 AM.
