Boost Creep, What RPM does it start?
03-07-03, 11:06 PM
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Boost Creep, What RPM does it start?
Hey...
I just replaced my HKS catback with a straight through exhaust. I have never had boost creep with my old setup. I took my car out to about 6K RPM or so and so far I have no boost creep. Im going to go to the drag strip tomorrow to test, but I am curious if anyone has any insight on this... I have searched, alot of info, but none discussed when it occures other than in 3rd gear.
I ran a good run to 6K in 3rd, my PFC settings are at 1 BAR with .50 on my selenoid, I hit only .83 by 6K RPM.
Hopefully my open exhaust will not creep (I know I'm gonna spike). Thanks for any info!!
I just replaced my HKS catback with a straight through exhaust. I have never had boost creep with my old setup. I took my car out to about 6K RPM or so and so far I have no boost creep. Im going to go to the drag strip tomorrow to test, but I am curious if anyone has any insight on this... I have searched, alot of info, but none discussed when it occures other than in 3rd gear.
I ran a good run to 6K in 3rd, my PFC settings are at 1 BAR with .50 on my selenoid, I hit only .83 by 6K RPM.
Hopefully my open exhaust will not creep (I know I'm gonna spike). Thanks for any info!!
03-08-03, 09:15 PM
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Appreciate the help guys, I went to the track today and thought things were cool since it would did not creep at 6k the day before, blew up my engine..
Again, Thanks for the help.
Again, Thanks for the help.
03-08-03, 09:41 PM
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Originally posted by ZeroBanger
Appreciate the help guys, I went to the track today and thought things were cool since it would did not creep at 6k the day before, blew up my engine..
Again, Thanks for the help.
Appreciate the help guys, I went to the track today and thought things were cool since it would did not creep at 6k the day before, blew up my engine..
Again, Thanks for the help.
I don't think boost creep and rpm are necessarily revelent. It depends on your car, how hard you are accelerating and probably a few other variables.
03-08-03, 09:43 PM
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nothing happened, went to the track, no boost creep, no blown engine.
Just hate the forum sometimes, ask a very simple question and no responses.
Just hate the forum sometimes, ask a very simple question and no responses.
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03-08-03, 09:50 PM
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Man, that's too bad .... didn't see this post until too late
Zero, that's a bummer. I wish I'd seen this before you went to the track.
It is my belief that the stock solenoids are not equipped to handle a straight-through exhaust. I know this comes to you too little, too late. I have a straight through (resonated mp), and use Pettit's old dial-a-boost setup, which has a single solenoid that is twice as big as the stock relief valves. I've not ever experienced boost creep using this setup. The Profec-B is the best way to go, since I believe it has two big relief valves - double venting and fail-over, in my opinion.
The boost issues you experienced are part of the reason that the Checkpoint custom twins I'm using are built with two wastgates for boost venting. So far with help from a reputable tuner on this list I'm now at 340 rwhp and 300 rwtq @ 16 lbs. boost with no spiking issues - boost stays right at 1.13 kp/cm2. When it is REALLY cold, I do see it get right to 1.15, the limit of the stock MAP sensor. Since I'm running in parallel, I get a smoother push of boost than the on-off-on of the sequential system. That sudden rush I think also contributes to boost spiking - it just overwhelms the system, especially when the air is cold and dense.
I'm sorry you now need to go through the rebuild process - it's a shock to the wallet, no doubt (I've done it twice now, so I can sympathize). Take this opportunity to do some more to the car, and invest in a Profec-B. I think based on our previous conversations you are also wanting to go to the next level and I'm afraid the stock solenoids are not equiped.
Beast
edit: Well, now I reread this thing and see you just did a 'psych'. I'm still leary of the stock system running a straight-through ..... maybe the PFC and the stock system is fast enough, but I'm not too sure. I like to get my solenoids away from the rats nest (where it is hot and can help them fail). My big solenoid is on the firewall, where it won't get heat baked.
It is my belief that the stock solenoids are not equipped to handle a straight-through exhaust. I know this comes to you too little, too late. I have a straight through (resonated mp), and use Pettit's old dial-a-boost setup, which has a single solenoid that is twice as big as the stock relief valves. I've not ever experienced boost creep using this setup. The Profec-B is the best way to go, since I believe it has two big relief valves - double venting and fail-over, in my opinion.
The boost issues you experienced are part of the reason that the Checkpoint custom twins I'm using are built with two wastgates for boost venting. So far with help from a reputable tuner on this list I'm now at 340 rwhp and 300 rwtq @ 16 lbs. boost with no spiking issues - boost stays right at 1.13 kp/cm2. When it is REALLY cold, I do see it get right to 1.15, the limit of the stock MAP sensor. Since I'm running in parallel, I get a smoother push of boost than the on-off-on of the sequential system. That sudden rush I think also contributes to boost spiking - it just overwhelms the system, especially when the air is cold and dense.
I'm sorry you now need to go through the rebuild process - it's a shock to the wallet, no doubt (I've done it twice now, so I can sympathize). Take this opportunity to do some more to the car, and invest in a Profec-B. I think based on our previous conversations you are also wanting to go to the next level and I'm afraid the stock solenoids are not equiped.
Beast
edit: Well, now I reread this thing and see you just did a 'psych'. I'm still leary of the stock system running a straight-through ..... maybe the PFC and the stock system is fast enough, but I'm not too sure. I like to get my solenoids away from the rats nest (where it is hot and can help them fail). My big solenoid is on the firewall, where it won't get heat baked.
Last edited by Beast From The East; 03-08-03 at 10:08 PM.
03-08-03, 11:20 PM
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Re: Man, that's too bad .... didn't see this post until too late
Originally posted by Beast From The East
Zero, that's a bummer. I wish I'd seen this before you went to the track.
It is my belief that the stock solenoids are not equipped to handle a straight-through exhaust. I know this comes to you too little, too late. I have a straight through (resonated mp), and use Pettit's old dial-a-boost setup, which has a single solenoid that is twice as big as the stock relief valves. I've not ever experienced boost creep using this setup. The Profec-B is the best way to go, since I believe it has two big relief valves - double venting and fail-over, in my opinion.
The boost issues you experienced are part of the reason that the Checkpoint custom twins I'm using are built with two wastgates for boost venting. So far with help from a reputable tuner on this list I'm now at 340 rwhp and 300 rwtq @ 16 lbs. boost with no spiking issues - boost stays right at 1.13 kp/cm2. When it is REALLY cold, I do see it get right to 1.15, the limit of the stock MAP sensor. Since I'm running in parallel, I get a smoother push of boost than the on-off-on of the sequential system. That sudden rush I think also contributes to boost spiking - it just overwhelms the system, especially when the air is cold and dense.
I'm sorry you now need to go through the rebuild process - it's a shock to the wallet, no doubt (I've done it twice now, so I can sympathize). Take this opportunity to do some more to the car, and invest in a Profec-B. I think based on our previous conversations you are also wanting to go to the next level and I'm afraid the stock solenoids are not equiped.
Beast
edit: Well, now I reread this thing and see you just did a 'psych'. I'm still leary of the stock system running a straight-through ..... maybe the PFC and the stock system is fast enough, but I'm not too sure. I like to get my solenoids away from the rats nest (where it is hot and can help them fail). My big solenoid is on the firewall, where it won't get heat baked.
Zero, that's a bummer. I wish I'd seen this before you went to the track.
It is my belief that the stock solenoids are not equipped to handle a straight-through exhaust. I know this comes to you too little, too late. I have a straight through (resonated mp), and use Pettit's old dial-a-boost setup, which has a single solenoid that is twice as big as the stock relief valves. I've not ever experienced boost creep using this setup. The Profec-B is the best way to go, since I believe it has two big relief valves - double venting and fail-over, in my opinion.
The boost issues you experienced are part of the reason that the Checkpoint custom twins I'm using are built with two wastgates for boost venting. So far with help from a reputable tuner on this list I'm now at 340 rwhp and 300 rwtq @ 16 lbs. boost with no spiking issues - boost stays right at 1.13 kp/cm2. When it is REALLY cold, I do see it get right to 1.15, the limit of the stock MAP sensor. Since I'm running in parallel, I get a smoother push of boost than the on-off-on of the sequential system. That sudden rush I think also contributes to boost spiking - it just overwhelms the system, especially when the air is cold and dense.
I'm sorry you now need to go through the rebuild process - it's a shock to the wallet, no doubt (I've done it twice now, so I can sympathize). Take this opportunity to do some more to the car, and invest in a Profec-B. I think based on our previous conversations you are also wanting to go to the next level and I'm afraid the stock solenoids are not equiped.
Beast
edit: Well, now I reread this thing and see you just did a 'psych'. I'm still leary of the stock system running a straight-through ..... maybe the PFC and the stock system is fast enough, but I'm not too sure. I like to get my solenoids away from the rats nest (where it is hot and can help them fail). My big solenoid is on the firewall, where it won't get heat baked.
03-08-03, 11:30 PM
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Ya...I do notice that sometimes..someone will ask a question..and get absolutely ZERO replies.
But of course..what can ya expect...we're here to help..but I guess not everyone wants to be considered a help desk.
If I would have scene it..I would have imparted some little tiny nugget of useless knowledge for you.
I'm glad your engine didn't blow up, though.
But of course..what can ya expect...we're here to help..but I guess not everyone wants to be considered a help desk.
If I would have scene it..I would have imparted some little tiny nugget of useless knowledge for you.
I'm glad your engine didn't blow up, though.
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