alright i had my boost controller at about 10 psi took off my exhaust and was running open downpipe (crazy sounding turbo!), doing so my boost went up to 16 psi. i was hauling ass until fuel cut. fun stuff!! by the way. when you blow your motor is it just pistons n rods i need to buy for repair? what else can blow?
16 Psi
- Thread starter levison
- Start date
Black_Protege_5
Member
- :
- Mazda Protege 5
well usually when you snap a rod it usually goes throught the block and sometimes the oil pan. And the piston could hit the head and you will have to replace the whole motor. Its not fun stuff. 16psi is way to high for a stock motor. Espcially with the stock ecu and nothing to control the fuel with the additional air.
Just pistons and rods? Even if that was 100% true those aren't something you throw in one night if you snap a rod. Most likely the block will be toast along with the other things that have been mentioned in this thread. Your injectors, let alone the stock ECU, cannot compensate for that much boost...put your exhaust back on lol.
SpeedBeaver
Member
- :
- Mazdaspeed Protege
Hum, I was about to put a exhaust cutout on my car (it's gonna be more or less the same thing as running open downpipe) I hope I won't hit that much PSI when I do so...
well the next thread is going to be one asking more questions about what i have to replace to get my motor running again. the " fun stuff " is going to be " upsetting stuff " for him. no kinda ems, a stock motor, and a guy who thanks that 16 psi is fun stuff is a bad combination.
do a compression test make sure you didnt hurt anything, then turn the boost down to ~9 psi and leave it there, that is if you want to keep your block from looking like swiss cheese. I only say this because you obviously arent careful with your car. If you were you could run more boost with more supporting mods. Right now you dont have the mods to run much more than 9 psi.
levison said:
Here is what throwing a rod will do to your engine. Block is see-through, oilpan is holey, intake manifold brace is bent, turbo coolant pipe is smashed, etc. It pretty much makes your whole engine a nice paperweight to showoff.
- :
- 2003.5 Mazda Protege' MazdaSpeed
The boost controller will increase the steady boost and spike. That is why he has a big spike. Using a boost controller he fools the actuator.jmv said:
Read this:
Your external wastegate or internal wastegate actuator has a base spring setting. For the sake of description lets say it has a 5 psi spring. That means that when 5 psi boost hits the diaphragm the wastegate opens. The VBC is installed inline with the hose that leads to the pressure side of the wastegate and the other side of the VBC is a vent. When the VBC is in the closed ( You cannot blow through it ) position, all the boost pressure goes to the wastegate and you have a stock boost level. As you open the VBC boost pressure that would have gone to the wastegate now diverts through the VBC. What this does is fool the wastegate. If you bleed off 5 psi on a 5 psi system it will take 10 psi to open the wastegate resulting in a 5 psi boost increase on your boost gauge and a lot more power from the engine. This is the simple version and results vary with the system, the size of the hose being used, the sensitivity of the wastegate spring. Manual boost controllers are also very prone to boost spikes. This occurs when the VBC is open all the way and small diameter hose is being used. The boost pressure builds faster than the hose can flow which lets the turbo spike up big boost numbers until the pressure fights its way through the small hose to the diaphragm, then the boost drops back down. This is a dangerous situation since the spike can blow up your engine before you know what happened. The best way to minimize spike is to keep the manual boost controller located under the hood with as short a length of hose as is possible.
damn, thanks fede intaliano for the info. I have an atp wastegate actuator i need to install because my stock has crapped out. Also i will be hooking up a boostscience mbc when it arrives. I have a defi d-guage installed, and i'm boosting 10psi but get some serious boost creep. will the new actuator and mbc help out against boost creep or make it worse?
