20G Fever!
Oct 21, 2005, 07:45 AM
#183
It really is only a part throttle issue for most people.. It happens to spool faster than people expect and that is where the surge comes from, part of it is driving style, part of it is how stiff some of the peoples BOV's are set so they are never opening adequately at part throttle and lower boost levels. This really is the EXACT same type of surge I used to get with my stock turbo and the HKS SSQV because it couldn't vent at part throttle adequately or when it would ramp too quikly. I also am using closed loop boost to keep the boost from spooling as quickly as it was and it solved the problem on the stock turbo and shouldn't be any different. It really is a matter of adjustment because the turbo spools and hits so hard at low RPM...
Oct 24, 2005, 07:11 PM
#185
Originally Posted by MalibuJack
It really is only a part throttle issue for most people.. It happens to spool faster than people expect and that is where the surge comes from, part of it is driving style, part of it is how stiff some of the peoples BOV's are set so they are never opening adequately at part throttle and lower boost levels. This really is the EXACT same type of surge I used to get with my stock turbo and the HKS SSQV because it couldn't vent at part throttle adequately or when it would ramp too quikly. I also am using closed loop boost to keep the boost from spooling as quickly as it was and it solved the problem on the stock turbo and shouldn't be any different. It really is a matter of adjustment because the turbo spools and hits so hard at low RPM...
Oct 25, 2005, 08:11 AM
#186
trinabe,
Most of your views/opinions in your post on page 12 are just dead wrong.
First off the 20G spools just about as quickly as the stock turbo. I cannot tell a difference seat of the pants.
Second, do you have any idea how many factory productions cars were built with no BOV on them? Each one of these cars experience compressor surge every single time the throttle is closed. Most of the race cars we build here do not run any BOV and if they do they are sprung so heavily they barely work, they also surge.
I have NEVER yet seen a turbo fail from compressor surge. NEVER. So while your statements do go along with some poorly written books that are on the market about turbocharging, I do not feel they are correct.
Also, a turbo coming apart will not cause the parts from it to be ingested into the engine of an EVO. The chances of that are extremely small. If an exhaust wheel breaks it goes out the exhaust pipe. IF the compressor wheel breaks the pieces are fairly large and would have to work their way through a dense intercooler core, which I have NEVER seen happen either. The pieces will end up in the end tank of the intercooler inlet if they go anywhere.
Furthermore, the surge port does NOT bypass air behind the compressor wheel. Have you ever looked at a anti-surge housing?
Sorry I seem like I coming off so hard on you but you are wrong on all of these things. It seems as though you are attacking a great turbo, to date my personal favorite. I drive my EVO everyday and love the turbo. Just finished a 900 mile trip with it, it's awesome.
David Buschur
www.buschurracing.com
Most of your views/opinions in your post on page 12 are just dead wrong.
First off the 20G spools just about as quickly as the stock turbo. I cannot tell a difference seat of the pants.
Second, do you have any idea how many factory productions cars were built with no BOV on them? Each one of these cars experience compressor surge every single time the throttle is closed. Most of the race cars we build here do not run any BOV and if they do they are sprung so heavily they barely work, they also surge.
I have NEVER yet seen a turbo fail from compressor surge. NEVER. So while your statements do go along with some poorly written books that are on the market about turbocharging, I do not feel they are correct.
Also, a turbo coming apart will not cause the parts from it to be ingested into the engine of an EVO. The chances of that are extremely small. If an exhaust wheel breaks it goes out the exhaust pipe. IF the compressor wheel breaks the pieces are fairly large and would have to work their way through a dense intercooler core, which I have NEVER seen happen either. The pieces will end up in the end tank of the intercooler inlet if they go anywhere.
Furthermore, the surge port does NOT bypass air behind the compressor wheel. Have you ever looked at a anti-surge housing?
Sorry I seem like I coming off so hard on you but you are wrong on all of these things. It seems as though you are attacking a great turbo, to date my personal favorite. I drive my EVO everyday and love the turbo. Just finished a 900 mile trip with it, it's awesome.
David Buschur
www.buschurracing.com
Oct 25, 2005, 08:13 AM
#187
Spool up is very fast trynidex, not much laggier than stock, I can't tell the difference seat of the pants in spool up.
On the highway running 80 mph (3,000 rpm) as soon as you touch the throttle the boost is at 20 psi.
David Buschur
www.buschurracing.com
On the highway running 80 mph (3,000 rpm) as soon as you touch the throttle the boost is at 20 psi.
David Buschur
www.buschurracing.com
Oct 25, 2005, 02:22 PM
#189
Originally Posted by davidbuschur
Spool up is very fast trynidex, not much laggier than stock, I can't tell the difference seat of the pants in spool up.
On the highway running 80 mph (3,000 rpm) as soon as you touch the throttle the boost is at 20 psi.
David Buschur
www.buschurracing.com
On the highway running 80 mph (3,000 rpm) as soon as you touch the throttle the boost is at 20 psi.
David Buschur
www.buschurracing.com
Oct 25, 2005, 06:38 PM
#190
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Originally Posted by davidbuschur
trinabe,
Most of your views/opinions in your post on page 12 are just dead wrong.
First off the 20G spools just about as quickly as the stock turbo. I cannot tell a difference seat of the pants.
Second, do you have any idea how many factory productions cars were built with no BOV on them? Each one of these cars experience compressor surge every single time the throttle is closed. Most of the race cars we build here do not run any BOV and if they do they are sprung so heavily they barely work, they also surge.
I have NEVER yet seen a turbo fail from compressor surge. NEVER. So while your statements do go along with some poorly written books that are on the market about turbocharging, I do not feel they are correct.
Also, a turbo coming apart will not cause the parts from it to be ingested into the engine of an EVO. The chances of that are extremely small. If an exhaust wheel breaks it goes out the exhaust pipe. IF the compressor wheel breaks the pieces are fairly large and would have to work their way through a dense intercooler core, which I have NEVER seen happen either. The pieces will end up in the end tank of the intercooler inlet if they go anywhere.
Furthermore, the surge port does NOT bypass air behind the compressor wheel. Have you ever looked at a anti-surge housing?
Sorry I seem like I coming off so hard on you but you are wrong on all of these things. It seems as though you are attacking a great turbo, to date my personal favorite. I drive my EVO everyday and love the turbo. Just finished a 900 mile trip with it, it's awesome.
David Buschur
www.buschurracing.com
Most of your views/opinions in your post on page 12 are just dead wrong.
First off the 20G spools just about as quickly as the stock turbo. I cannot tell a difference seat of the pants.
Second, do you have any idea how many factory productions cars were built with no BOV on them? Each one of these cars experience compressor surge every single time the throttle is closed. Most of the race cars we build here do not run any BOV and if they do they are sprung so heavily they barely work, they also surge.
I have NEVER yet seen a turbo fail from compressor surge. NEVER. So while your statements do go along with some poorly written books that are on the market about turbocharging, I do not feel they are correct.
Also, a turbo coming apart will not cause the parts from it to be ingested into the engine of an EVO. The chances of that are extremely small. If an exhaust wheel breaks it goes out the exhaust pipe. IF the compressor wheel breaks the pieces are fairly large and would have to work their way through a dense intercooler core, which I have NEVER seen happen either. The pieces will end up in the end tank of the intercooler inlet if they go anywhere.
Furthermore, the surge port does NOT bypass air behind the compressor wheel. Have you ever looked at a anti-surge housing?
Sorry I seem like I coming off so hard on you but you are wrong on all of these things. It seems as though you are attacking a great turbo, to date my personal favorite. I drive my EVO everyday and love the turbo. Just finished a 900 mile trip with it, it's awesome.
David Buschur
www.buschurracing.com
Last edited by robertrinaustin; Oct 25, 2005 at 06:41 PM.
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