TOO MUCH BOOST? (On my D16Z6 with IHI RHB5)
06-17-2003, 01:16 PM
#12
1.5 BAR
Join Date: Feb 2003
Posts: 702
Re:TOO MUCH BOOST? (On my D16Z6 with IHI RHB5)
Ok..
Instead of just making the rod longer so that it doesn't shut all the way. He puts the spring in and them preloads the actuator. You can see in his write up that it actually moves the rod with less pressure. He maintains the same rod length but the spring acts like constant boost on the actuator.. You tighten it up as much as need to get the desired boost level.
Ken, the owner of the site, is a really nice guy. If you have more questions just email him. He has good deals on EGT meters also.
Instead of just making the rod longer so that it doesn't shut all the way. He puts the spring in and them preloads the actuator. You can see in his write up that it actually moves the rod with less pressure. He maintains the same rod length but the spring acts like constant boost on the actuator.. You tighten it up as much as need to get the desired boost level.
Ken, the owner of the site, is a really nice guy. If you have more questions just email him. He has good deals on EGT meters also.
06-17-2003, 01:23 PM
#13
0.5 BAR
Thread Starter
Join Date: Mar 2003
Posts: 116
Re:TOO MUCH BOOST? (On my D16Z6 with IHI RHB5)
Hmm.....
I feel RETARDED
Although you've explained the point of using the spring, I still don't get it (maybe I'm just tired).
Please ELABORATE on why he used the Spring...
What would happen I didn't use a spring...
Different boost level?
Different boost CURVE?
(or just a major -----up, because the wastegate won't close
??)
Do I NEED to use a spring?
(sorry to bug you, but I wanna get this right).
I feel RETARDED
Although you've explained the point of using the spring, I still don't get it (maybe I'm just tired).
Please ELABORATE on why he used the Spring...
What would happen I didn't use a spring...
Different boost level?
Different boost CURVE?
(or just a major -----up, because the wastegate won't close
??)Do I NEED to use a spring?
(sorry to bug you, but I wanna get this right).
j/k
06-17-2003, 01:39 PM
#16
1.5 BAR
Join Date: Feb 2003
Posts: 702
Re:TOO MUCH BOOST? (On my D16Z6 with IHI RHB5)
Ok.. the difference between spring and no spring. First no spring. The no spring method is to lengthen the rod so that when the actuator see's 10 psi its not pushing the rod farther open and letting more exhaust out. Thus keeping boost lower. The downside is the wastegate is always a little bit open.
With the spring method you adjust the wastegate rod to the original length so the flap stays shut. Here is the easiest way I can explain what the spring does. You have a seesaw, like in a play ground for kids. I weight 200lbs and you weigh 100lbs. To make it work someone else would have to push 100lbs on your side.. That someone is the boost in our case.
So at this point your at 100lbs boost.. Say you only want to use 80lbs boost. you would have to hold a 20lb weight. Then it would only take the 80lbs since your already preloading yourside with the weight.
Now.. Since boost pushes on the back side of the actuator housing and forces the rod out, and this takes 12psi in this case. you do all the mods on his site. What the spring does is push on the two washers and preload the diaphram inside the actuator. You put more preload on the spring to decrease the boost and take it off to bring it back to stock. I'm not sure what size spring and the exact tension you need. That will be trial and error.
So the spring will allow you to keep the wastegate shut like normal by applying a preload to the wastegate rod. Make sense now?
With the spring method you adjust the wastegate rod to the original length so the flap stays shut. Here is the easiest way I can explain what the spring does. You have a seesaw, like in a play ground for kids. I weight 200lbs and you weigh 100lbs. To make it work someone else would have to push 100lbs on your side.. That someone is the boost in our case.
So at this point your at 100lbs boost.. Say you only want to use 80lbs boost. you would have to hold a 20lb weight. Then it would only take the 80lbs since your already preloading yourside with the weight.
Now.. Since boost pushes on the back side of the actuator housing and forces the rod out, and this takes 12psi in this case. you do all the mods on his site. What the spring does is push on the two washers and preload the diaphram inside the actuator. You put more preload on the spring to decrease the boost and take it off to bring it back to stock. I'm not sure what size spring and the exact tension you need. That will be trial and error.
So the spring will allow you to keep the wastegate shut like normal by applying a preload to the wastegate rod. Make sense now?
06-17-2003, 01:42 PM
#17
3.0 BAR
Join Date: Feb 2003
Posts: 9,089
Re:TOO MUCH BOOST? (On my D16Z6 with IHI RHB5)
oooh i get that now.. good explanation...
you get a spring that more or less simulates 4psi of boost (example). then the turbo would push open the 12psi wg arm at 8psi instead of 12.
you get a spring that more or less simulates 4psi of boost (example). then the turbo would push open the 12psi wg arm at 8psi instead of 12.
06-17-2003, 01:51 PM
#19
0.5 BAR
Thread Starter
Join Date: Mar 2003
Posts: 116
Re:TOO MUCH BOOST? (On my D16Z6 with IHI RHB5)
Todd,
Thanks a LOT for that explanation...
(Now that I understand how it works, I feel like a dumbass for asking you such stupid questions.)
As you can see, Physics is not my Major
How reliable is this method of boost adjustment?
Does Pre-Loading the wastegate with the tension of the spring cause any LAG, does it cause the turbo to SPOOL UP FASTER, or it makes no difference on the spool-up time...
(uh oh... I feel like I've just asked another dumb question.)
Thanks a LOT for that explanation...
(Now that I understand how it works, I feel like a dumbass for asking you such stupid questions.)
As you can see, Physics is not my Major
How reliable is this method of boost adjustment?
Does Pre-Loading the wastegate with the tension of the spring cause any LAG, does it cause the turbo to SPOOL UP FASTER, or it makes no difference on the spool-up time...
(uh oh... I feel like I've just asked another dumb question.)
06-17-2003, 01:57 PM
#20
1.5 BAR
Join Date: Feb 2003
Posts: 702
Re:TOO MUCH BOOST? (On my D16Z6 with IHI RHB5)
it will be just as reliable as stock..
your boost response will be the same as it was stock, assuming you get the rod length the same as it was before.. its important to measure twice before you cut the rod the first time.
Another nice thing about this is when your ready for higher boost you just use the main coupler and make the rod shorter. This will make the diaphram push harder to open it and increase the boost.. Saves you $7 on a needle valve.
your boost response will be the same as it was stock, assuming you get the rod length the same as it was before.. its important to measure twice before you cut the rod the first time.
Another nice thing about this is when your ready for higher boost you just use the main coupler and make the rod shorter. This will make the diaphram push harder to open it and increase the boost.. Saves you $7 on a needle valve.
