How to get boost to hold steady till redline?
04-30-2012, 09:17 PM
#21
I do run a 14.5 psi spring in my Tial MVR WG, so you running a 10 psi may only be your problem. My turbo is the 6262SP JB with .82 AR hotside also and we haven't seen any sign of the turbo running out just yet at 33-34 psi. I'm sure it's close, but should hold until around 36 psi. When we first tuned it to 741 whp at 29.6 psi, we did have boost falling off at around 28 psi until my tuner made a few adjustments. I'm just not positive what those were other than to think he messed with the boost controller some. There are more things to adjust with the boost controller to get it to hold boost at the top, I just cant remember what it is you have to do.
05-01-2012, 01:37 PM
#22
Originally Posted by Spoolin' timestamp='1335834665' post='21657454
I do run a 14.5 psi spring in my Tial MVR WG, so you running a 10 psi may only be your problem. My turbo is the 6262SP JB with .82 AR hotside also and we haven't seen any sign of the turbo running out just yet at 33-34 psi. I'm sure it's close, but should hold until around 36 psi. When we first tuned it to 741 whp at 29.6 psi, we did have boost falling off at around 28 psi until my tuner made a few adjustments. I'm just not positive what those were other than to think he messed with the boost controller some. There are more things to adjust with the boost controller to get it to hold boost at the top, I just cant remember what it is you have to do.
05-01-2012, 01:47 PM
#23
Originally Posted by 1SlowSi' timestamp='1335849428' post='21658040
[quote name='Spoolin' timestamp='1335834665' post='21657454']
I do run a 14.5 psi spring in my Tial MVR WG, so you running a 10 psi may only be your problem. My turbo is the 6262SP JB with .82 AR hotside also and we haven't seen any sign of the turbo running out just yet at 33-34 psi. I'm sure it's close, but should hold until around 36 psi. When we first tuned it to 741 whp at 29.6 psi, we did have boost falling off at around 28 psi until my tuner made a few adjustments. I'm just not positive what those were other than to think he messed with the boost controller some. There are more things to adjust with the boost controller to get it to hold boost at the top, I just cant remember what it is you have to do.
I do run a 14.5 psi spring in my Tial MVR WG, so you running a 10 psi may only be your problem. My turbo is the 6262SP JB with .82 AR hotside also and we haven't seen any sign of the turbo running out just yet at 33-34 psi. I'm sure it's close, but should hold until around 36 psi. When we first tuned it to 741 whp at 29.6 psi, we did have boost falling off at around 28 psi until my tuner made a few adjustments. I'm just not positive what those were other than to think he messed with the boost controller some. There are more things to adjust with the boost controller to get it to hold boost at the top, I just cant remember what it is you have to do.
[/quote]
Yeah I remember the setting. Has to do with the frequency or something of the like
05-01-2012, 02:30 PM
#24
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The issue I'm having is that my boost keeps dropping 2 psi by the time it hits redline. Boost always comes on strong until it hits about 7k rpms and starts to slowly fall off. This is why I hit 470tq in the midrange and 696 hp up top because I hit 28 psi but dropped to 25.8 - 26 psi at the end. I would have made 700 if it weren't because of this issue. This kinda sucks because I want to keep the boost in the midrange the same up top so I'm not over boosting at the peak tq area. My current setup is
Sidewinder manifold
6262sp T3 hot side with .82 ar.
Tial 44 MVR wg with 10 psi spring.
MAC 3 port solenoid
Controlled via KPro
I'm not sure how accurate the solenoids are at high duty cycles but to hit 22 psi I'm at 66% duty cycle and to hit 28 psi I was at 95% duty cycle. Are these things even working properly at such higher dc? I wanted to run more dc up top to keep boost level but I was maxed out. When I say 22psi I mean in the mid and dropping to 20 up top and 28 psi dropping to 26. I get the same issues even at 14-16 psi.
Someone was saying that I could run the 4 port solenoid to get more out of the spring and to lower by boost controller duty cycle. Any thoughts in what might work?
Sidewinder manifold
6262sp T3 hot side with .82 ar.
Tial 44 MVR wg with 10 psi spring.
MAC 3 port solenoid
Controlled via KPro
I'm not sure how accurate the solenoids are at high duty cycles but to hit 22 psi I'm at 66% duty cycle and to hit 28 psi I was at 95% duty cycle. Are these things even working properly at such higher dc? I wanted to run more dc up top to keep boost level but I was maxed out. When I say 22psi I mean in the mid and dropping to 20 up top and 28 psi dropping to 26. I get the same issues even at 14-16 psi.
Someone was saying that I could run the 4 port solenoid to get more out of the spring and to lower by boost controller duty cycle. Any thoughts in what might work?
05-01-2012, 03:26 PM
#26
Im going to change the spring. This is an easy fix for sure and thats by using a bigger spring and adding duty cycle in KPRO from 7krpms to redline. To hold boost steady at 22 psi it looks something like this...
2k 3k 4k 5k 6k 7k 7500k 8000k 8500k
66 66 66 66 66 67 68 70 70
This is to peak at 22 psi and hold it steady till redline.
2k 3k 4k 5k 6k 7k 7500k 8000k 8500k
66 66 66 66 66 67 68 70 70
This is to peak at 22 psi and hold it steady till redline.
05-01-2012, 03:53 PM
#28
Yeah man will do. I guess I found the limits of a 10psi spring and the 3 port MAC solenoid. I'm not too upset right now because 22 psi is insane on the street as it is haha. Whats crazy is that I hit 22 psi at 66% duty cycle and to hit 28 I was at 95% duty cycle. 29% to make 6 psi? Maybe this is a normal characteristic for my particular setup.
Once I put a new spring, I will have to hit up the dyno to dial the boost in because the street is too dangerous at 28 psi.
Once I put a new spring, I will have to hit up the dyno to dial the boost in because the street is too dangerous at 28 psi.
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