It's Turbo Upgrade Time!
Senior Member
Joined: Dec 2001
Posts: 2,934
From: Jensen Beach, FL / Sylva, NC
Mazdadrifter has a ball valve boost controler. Its for sale if you want it. A ball valve is fine but is a PITA to adjust. I helped him w/ adjusting and could see how a blown engine could very easily happen if you are not quick with your right foot. They are very touchy. The benefit of a electronic one is basically ease of adjustiblity. I can change my boost as easily as I can change the volume on my radio.
I did not want to get into the whole debate on the workings of them because it was not the point of this thread. I have done a ton of research on every part I have put into my car and know what I am talking about.
I prefer real world "butt dyno" over what companies claim.
Fedrex from Teamfc3s had the identical setup as me except bo boost controler my car would clobber him in a race. He was wasting time spooling up I was pulling away.
Higher gears we were even but 1st and 2nd I had the advantage.
I did not want to get into the whole debate on the workings of them because it was not the point of this thread. I have done a ton of research on every part I have put into my car and know what I am talking about.
I prefer real world "butt dyno" over what companies claim.
Fedrex from Teamfc3s had the identical setup as me except bo boost controler my car would clobber him in a race. He was wasting time spooling up I was pulling away.
Higher gears we were even but 1st and 2nd I had the advantage.
Senior Member
Joined: Mar 2002
Posts: 288
Originally Posted by 1988RedT2' date='Sep 11 2003, 09:01 PM
Help me to understand this. I thought a boost controller would only let you increase maximum boost. The ones I've looked at just delay the opening of the stock wastegate to a higher pressure.
How does the boost controller affect how quickly the boost comes up?
How does the boost controller affect how quickly the boost comes up?
a boost controller will not help it spool from 0-5psi any faster then stock.
however with no boost controller. at 5psi the wastegate is fully open. any boost after 5psi is boost creep. and creeping is "slow rising".
your turbo at 5psi. creeping to 10psi. is ALOT slower then a boost controller set at 10psi.
Thread Starter
Super Moderator
Joined: Apr 2002
Posts: 2,535
From: VA
Originally Posted by Scott 89t2' date='Sep 14 2003, 01:35 AM
[quote name='1988RedT2' date='Sep 11 2003, 09:01 PM'] Help me to understand this. I thought a boost controller would only let you increase maximum boost. The ones I've looked at just delay the opening of the stock wastegate to a higher pressure.
How does the boost controller affect how quickly the boost comes up?
How does the boost controller affect how quickly the boost comes up?
a boost controller will not help it spool from 0-5psi any faster then stock.
however with no boost controller. at 5psi the wastegate is fully open. any boost after 5psi is boost creep. and creeping is "slow rising".
your turbo at 5psi. creeping to 10psi. is ALOT slower then a boost controller set at 10psi. [/quote]
Thank you, Scott! That makes a whole lot of sense. I don't know where I got it in my head that the wastegate spring was set for 10 psi. I swear I read it somewhere. I may be mistaken.
Hmm. It seems I need a boost controller...
Senior Member
Joined: Dec 2001
Posts: 2,934
From: Jensen Beach, FL / Sylva, NC
Originally Posted by Jims5543' date='Sep 12 2003, 10:12 AM
I am not going to get into a whole debate on the actual workings of the boost controler. I will tell you my observations from my own experiance.
With out a boost controler I would see peak boost at 6K RPM on up WITH the boost controler I would see peak boost at 3,500 RPM and it would stay there until redline.
When you have a boost controler your car will pull harder down low.
You will not regret it. Best money I ever spent and if I could do it over again it would have been my FIRST mod. Period.
With out a boost controler I would see peak boost at 6K RPM on up WITH the boost controler I would see peak boost at 3,500 RPM and it would stay there until redline.
When you have a boost controler your car will pull harder down low.
You will not regret it. Best money I ever spent and if I could do it over again it would have been my FIRST mod. Period.
Thread Starter
Super Moderator
Joined: Apr 2002
Posts: 2,535
From: VA
Okay. Update time. Car is back together and running with the new turbo. It makes boost just fine, but I didn't dog it too hard tonight. Majestic says to idle the car for 5 minutes without revving it. I did that. Also drove it around a bit. Any other "break in" required for rebuilt turbos?
I'm not crazy. The 1988 Mazda factory service manual describes testing the wastegate by applying 10 psi to the actuator and verifying that it moves. Hence my prior belief that the wastegate didn't come into play until 10 psi.
To settle the issue once and for all, I hooked up an air pump and a pressure gauge to my wastegate actuator today. Sure enough, it starts to move at around 5 psi. Pretty much wide open by 8 or 9 psi.
As much as I find the fancy-schmancy electronic BC's attractive, I suspect I'll go with a cheapie manual boost controller 'cause my budget is spent.
I'm not crazy. The 1988 Mazda factory service manual describes testing the wastegate by applying 10 psi to the actuator and verifying that it moves. Hence my prior belief that the wastegate didn't come into play until 10 psi.
To settle the issue once and for all, I hooked up an air pump and a pressure gauge to my wastegate actuator today. Sure enough, it starts to move at around 5 psi. Pretty much wide open by 8 or 9 psi.
As much as I find the fancy-schmancy electronic BC's attractive, I suspect I'll go with a cheapie manual boost controller 'cause my budget is spent.
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