Boost Creep Fix? Hitting 21psi on wastegate?
Im gonna try to adjust pre load on the WG, and then I'll go from there.
What about the o2 dump housings??? Do they really cure boost creep or is just hype????
Another question how do you adjust the stock WG??? Is it just by disconnecting the rod istelf and turning it???
What about the o2 dump housings??? Do they really cure boost creep or is just hype????
Another question how do you adjust the stock WG??? Is it just by disconnecting the rod istelf and turning it???
Last edited by huevosrancheros; Dec 14, 2008 at 03:10 AM.
Im gonna try to adjust pre load on the WG, and then I'll go from there.
What about the o2 dump housings??? Do they really cure boost creep or is just hype????
Another question how do you adjust the stock WG??? Is it just by disconnecting the rod istelf and turning it???
What about the o2 dump housings??? Do they really cure boost creep or is just hype????
Another question how do you adjust the stock WG??? Is it just by disconnecting the rod istelf and turning it???
As far as adjustment goes, I think that's all you have to do. Just turn the rod; sounds simple but it's a bit tricky as it's in such a confined space.
I like the EPM O2 dump housing myself. The colder weather is accountable for 2-3 PSI of your creep, while the replacement of the cat with the TP is resposible for the other 2-3 PSI.
Playing with the wastegate preload is not going to help very much, if at all, in your case.
Playing with the wastegate preload is not going to help very much, if at all, in your case.
I'd think that the unported, stock O2 elbow in conjunction with the less restrictive testpipe, in addition to the lower ambient air temps are all combining to exacerbate the boost creep, my friend.
Is there any possible way to fix the boost creep without giving up the tp? I guess upgrading the O2 housing won't help all that much?
Last edited by timmiii; Dec 14, 2008 at 05:18 PM.
Right now... I'm seeing max 23.35psi in 4th, however, boost cut or fuel cut hit around there and stopped the boost form climbing it might have gone up to even 25psi if it were able to keep going. I'm using a HKS EVC V. Usually I set the boost to hit 18 to 19 psi.
Is there any possible way to fix the boost creep without giving up the tp?....
Is there any possible way to fix the boost creep without giving up the tp?....
I am running 22-23 PSI in hot tropical weather on 90 octane, without knock, on my VIII. I think that you just need a good tune. Get a tune and keep the test pipe.
A tubular O2 with an enlarged merge hole, or an O2 dump might help, but first I'd get a good tune and go from there.
If I lived in your region, I'd make an appointment with Sean Ivey and have him tune your car. He can probably tune around the creep. 23-24# on 93 octane, in cold weather, without knock, given a good tune should be doable and safe.
I am running 22-23 PSI in hot tropical weather on 90 octane, without knock, on my VIII. I think that you just need a good tune. Get a tune and keep the test pipe.
A tubular O2 with an enlarged merge hole, or an O2 dump might help, but first I'd get a good tune and go from there.
I am running 22-23 PSI in hot tropical weather on 90 octane, without knock, on my VIII. I think that you just need a good tune. Get a tune and keep the test pipe.
A tubular O2 with an enlarged merge hole, or an O2 dump might help, but first I'd get a good tune and go from there.
Boost Creep and even Taper is something that will always be around on Turbo cars.
There are many things that you can do to help alleviate the problem, and or lessen it's effects. In as much as getting back to your questions about Boost Creep; think about the "cause" of Boost creep.
An inadequate effort of your WG to bleed off excessive exhaust pressure.
So what can be done to help the WG ?
One of many things can combat Boost Creep.
#1-Tuning the Boost Controller to be more aggressive but yet still maintain and control the target Boost.
#2-Lessen any restriction the WG might currently have. An O2 Housing that can expel the excess exhaust pressure can work wonders. The OEM O2 Housing introduces the WG exhaust back into the Turbine exhaust causing turbulence and back pressure. The current crop of O2 Dump housings can and will help with Boost creep and also with Boost Taper.
In the cooler temps of this season you will find denser air/more boost, you will have to tune for this every cold season. Just as in the warmer months you will have to Tune for that temp range.
Think about your current mods; plan for your future mods which will help with these boost creep issues, but will also help you attain power gains and a better tune for your Evo. Just as you introduce a new mod into your Evo you are in essence weaking the other corresponding areas of that system. All of your power mods should work together for a common goal. If you as an example add a test pipe but nothing else you have thrown more pressure into the exhaust system but further down the tract, causing too much pressure to build up. Exhaust should be thought of as a stream, you want the flow to be smooth and as fast as possible. A turbo car Needs NO Back Pressure, the Turbo itself is the back pressure. You can't have too big an exhaust on a turbo car. Think back to my stream analogy, you want the exhaust stream to be as fast and constant with as few restrictions as theoretically possible. Adding a test pipe has quickened the exhaust stream down flow, but what about upstream?
These are just a few examples to get you to think about the underlying causes and possible solutions to boost creep and boost taper, and also power gains from the exhaust system.
There are many things that you can do to help alleviate the problem, and or lessen it's effects. In as much as getting back to your questions about Boost Creep; think about the "cause" of Boost creep.
An inadequate effort of your WG to bleed off excessive exhaust pressure.
So what can be done to help the WG ?
One of many things can combat Boost Creep.
#1-Tuning the Boost Controller to be more aggressive but yet still maintain and control the target Boost.
#2-Lessen any restriction the WG might currently have. An O2 Housing that can expel the excess exhaust pressure can work wonders. The OEM O2 Housing introduces the WG exhaust back into the Turbine exhaust causing turbulence and back pressure. The current crop of O2 Dump housings can and will help with Boost creep and also with Boost Taper.
In the cooler temps of this season you will find denser air/more boost, you will have to tune for this every cold season. Just as in the warmer months you will have to Tune for that temp range.
Think about your current mods; plan for your future mods which will help with these boost creep issues, but will also help you attain power gains and a better tune for your Evo. Just as you introduce a new mod into your Evo you are in essence weaking the other corresponding areas of that system. All of your power mods should work together for a common goal. If you as an example add a test pipe but nothing else you have thrown more pressure into the exhaust system but further down the tract, causing too much pressure to build up. Exhaust should be thought of as a stream, you want the flow to be smooth and as fast as possible. A turbo car Needs NO Back Pressure, the Turbo itself is the back pressure. You can't have too big an exhaust on a turbo car. Think back to my stream analogy, you want the exhaust stream to be as fast and constant with as few restrictions as theoretically possible. Adding a test pipe has quickened the exhaust stream down flow, but what about upstream?
These are just a few examples to get you to think about the underlying causes and possible solutions to boost creep and boost taper, and also power gains from the exhaust system.
Boost Creep and even Taper is something that will always be around on Turbo cars.
There are many things that you can do to help alleviate the problem, and or lessen it's effects. In as much as getting back to your questions about Boost Creep; think about the "cause" of Boost creep.
An inadequate effort of your WG to bleed off excessive exhaust pressure.
So what can be done to help the WG ?
One of many things can combat Boost Creep.
#1-Tuning the Boost Controller to be more aggressive but yet still maintain and control the target Boost.
#2-Lessen any restriction the WG might currently have. An O2 Housing that can expel the excess exhaust pressure can work wonders. The OEM O2 Housing introduces the WG exhaust back into the Turbine exhaust causing turbulence and back pressure. The current crop of O2 Dump housings can and will help with Boost creep and also with Boost Taper.
In the cooler temps of this season you will find denser air/more boost, you will have to tune for this every cold season. Just as in the warmer months you will have to Tune for that temp range.
Think about your current mods; plan for your future mods which will help with these boost creep issues, but will also help you attain power gains and a better tune for your Evo. Just as you introduce a new mod into your Evo you are in essence weaking the other corresponding areas of that system. All of your power mods should work together for a common goal. If you as an example add a test pipe but nothing else you have thrown more pressure into the exhaust system but further down the tract, causing too much pressure to build up. Exhaust should be thought of as a stream, you want the flow to be smooth and as fast as possible. A turbo car Needs NO Back Pressure, the Turbo itself is the back pressure. You can't have too big an exhaust on a turbo car. Think back to my stream analogy, you want the exhaust stream to be as fast and constant with as few restrictions as theoretically possible. Adding a test pipe has quickened the exhaust stream down flow, but what about upstream?
These are just a few examples to get you to think about the underlying causes and possible solutions to boost creep and boost taper, and also power gains from the exhaust system.
There are many things that you can do to help alleviate the problem, and or lessen it's effects. In as much as getting back to your questions about Boost Creep; think about the "cause" of Boost creep.
An inadequate effort of your WG to bleed off excessive exhaust pressure.
So what can be done to help the WG ?
One of many things can combat Boost Creep.
#1-Tuning the Boost Controller to be more aggressive but yet still maintain and control the target Boost.
#2-Lessen any restriction the WG might currently have. An O2 Housing that can expel the excess exhaust pressure can work wonders. The OEM O2 Housing introduces the WG exhaust back into the Turbine exhaust causing turbulence and back pressure. The current crop of O2 Dump housings can and will help with Boost creep and also with Boost Taper.
In the cooler temps of this season you will find denser air/more boost, you will have to tune for this every cold season. Just as in the warmer months you will have to Tune for that temp range.
Think about your current mods; plan for your future mods which will help with these boost creep issues, but will also help you attain power gains and a better tune for your Evo. Just as you introduce a new mod into your Evo you are in essence weaking the other corresponding areas of that system. All of your power mods should work together for a common goal. If you as an example add a test pipe but nothing else you have thrown more pressure into the exhaust system but further down the tract, causing too much pressure to build up. Exhaust should be thought of as a stream, you want the flow to be smooth and as fast as possible. A turbo car Needs NO Back Pressure, the Turbo itself is the back pressure. You can't have too big an exhaust on a turbo car. Think back to my stream analogy, you want the exhaust stream to be as fast and constant with as few restrictions as theoretically possible. Adding a test pipe has quickened the exhaust stream down flow, but what about upstream?
These are just a few examples to get you to think about the underlying causes and possible solutions to boost creep and boost taper, and also power gains from the exhaust system.
+1 on some good info
Boost Creep and even Taper is something that will always be around on Turbo cars.
There are many things that you can do to help alleviate the problem, and or lessen it's effects. In as much as getting back to your questions about Boost Creep; think about the "cause" of Boost creep.
An inadequate effort of your WG to bleed off excessive exhaust pressure.
So what can be done to help the WG ?
One of many things can combat Boost Creep.
#1-Tuning the Boost Controller to be more aggressive but yet still maintain and control the target Boost.
#2-Lessen any restriction the WG might currently have. An O2 Housing that can expel the excess exhaust pressure can work wonders. The OEM O2 Housing introduces the WG exhaust back into the Turbine exhaust causing turbulence and back pressure. The current crop of O2 Dump housings can and will help with Boost creep and also with Boost Taper.
In the cooler temps of this season you will find denser air/more boost, you will have to tune for this every cold season. Just as in the warmer months you will have to Tune for that temp range.
Think about your current mods; plan for your future mods which will help with these boost creep issues, but will also help you attain power gains and a better tune for your Evo. Just as you introduce a new mod into your Evo you are in essence weaking the other corresponding areas of that system. All of your power mods should work together for a common goal. If you as an example add a test pipe but nothing else you have thrown more pressure into the exhaust system but further down the tract, causing too much pressure to build up. Exhaust should be thought of as a stream, you want the flow to be smooth and as fast as possible. A turbo car Needs NO Back Pressure, the Turbo itself is the back pressure. You can't have too big an exhaust on a turbo car. Think back to my stream analogy, you want the exhaust stream to be as fast and constant with as few restrictions as theoretically possible. Adding a test pipe has quickened the exhaust stream down flow, but what about upstream?
These are just a few examples to get you to think about the underlying causes and possible solutions to boost creep and boost taper, and also power gains from the exhaust system.
There are many things that you can do to help alleviate the problem, and or lessen it's effects. In as much as getting back to your questions about Boost Creep; think about the "cause" of Boost creep.
An inadequate effort of your WG to bleed off excessive exhaust pressure.
So what can be done to help the WG ?
One of many things can combat Boost Creep.
#1-Tuning the Boost Controller to be more aggressive but yet still maintain and control the target Boost.
#2-Lessen any restriction the WG might currently have. An O2 Housing that can expel the excess exhaust pressure can work wonders. The OEM O2 Housing introduces the WG exhaust back into the Turbine exhaust causing turbulence and back pressure. The current crop of O2 Dump housings can and will help with Boost creep and also with Boost Taper.
In the cooler temps of this season you will find denser air/more boost, you will have to tune for this every cold season. Just as in the warmer months you will have to Tune for that temp range.
Think about your current mods; plan for your future mods which will help with these boost creep issues, but will also help you attain power gains and a better tune for your Evo. Just as you introduce a new mod into your Evo you are in essence weaking the other corresponding areas of that system. All of your power mods should work together for a common goal. If you as an example add a test pipe but nothing else you have thrown more pressure into the exhaust system but further down the tract, causing too much pressure to build up. Exhaust should be thought of as a stream, you want the flow to be smooth and as fast as possible. A turbo car Needs NO Back Pressure, the Turbo itself is the back pressure. You can't have too big an exhaust on a turbo car. Think back to my stream analogy, you want the exhaust stream to be as fast and constant with as few restrictions as theoretically possible. Adding a test pipe has quickened the exhaust stream down flow, but what about upstream?
These are just a few examples to get you to think about the underlying causes and possible solutions to boost creep and boost taper, and also power gains from the exhaust system.