That's what I've learned recently as well, faster spool and a some incorporate an O2 sensor to cut boost when the engine goes lean which I like.
I wouldn't mind having just a couple settings. (6 lbs./10 lbs./12-13 lbs. on a button perhaps)
I'd be curious to know how it helps the turbo spool faster as well.

 

"more boost then the spring pressure." I don't understand. It goes above spring pressure boost then reverts to spring boost? How much more boost and for how long until it reverts back to spring pressure boost?

 

Yes some have a 5v input/output that can link to an oil pressure, fuel pressure, or o2 sensor and provide a fail safe.

It helps spool because its blocking the boost signal from the wastegate until your desired setting. If you run a normal vacuum line to your wastegate it will start to crack before the total open pressure which slows spool. You can also add boost pressure to the top port to keep the wastegate closed, sometimes in a high backpressure setup can lead to slow spool.


The point of a boost controller is to run higher boost then your installed spring pressure, pretty much boost 101. Multiple ways to set these up with 3 port, 4 port, dual solenoids, etc.. Either way the solenoid makes the wastegate "see" less pressure on the bottom "opening side" port by bleeding some off from the pressure source. Other setups add the boost pressure to the top "closing side" port to clamp the wastegate shut until desired boost level is reached. When you have a safety setup then it can revert to spring pressure, and if its tied into software it can also pull timing or totally cut ignition in an overboost situation.

 

You keep saying higher boost then it changes to spring boost. Why? I thought a boost controller would put the boost wherever you wanted it whether it was higher than or equal to spring pressure. It did not have to revert to spring pressure which you imply by saying "run higher boost then your installed spring pressure."

 

You must be missing something, the boost controller has no issue holding boost higher then the spring pressure. It only reverts to spring pressure when you have a safety setup or you have the boost controller turned off.

For example you can have 3 boost settings even with a cheap controller: controller off - spring pressure, setting 1 - 50% duty cycle (~1.5x spring pressure) and setting 2 - 100% duty cycle (2x spring pressure). During setting 1 or 2, if you have a safety setup (oil-fuel-A/F,etc) on the controller it can revert to spring pressure to help save the engine.

But really we have been able to get 35PSI out of even 12lb springs with a controller set the bottom port so the 2x rule isn't set in stone, just a guideline.

 

To add to that, boost controllers work by adding pressure to the top of the wastegate (ie increasing spring pressure) or by bleeding boost off to the bottom so that the gate is sort of fooled into thinking the system is seeing less pressure. Controllers cannot, due to mechanics, go below spring pressure.

 

Only if your definition of Performance is defined as long straight line acceleration

 

Nope that's a big part of it and what 90+% of people on here do, but just get a smaller turbo and it will spool instantly and still make more then most blower setups without any belt slip... I know my T7878 makes more power sooner at the same boost level as any of my procharged setups, so I don't know why it wouldn't be used for auto-x or something else.

 

I think Germany tends to disagree... M3, M4, M5 all turbo, lots of turbo Benz's, plenty of turbo VW/Audi's, even the ATS-V is turbo and it competes well in GT3.

 

Rally racing doesn't seem to have any issues with turbos, almost all have antilag to stay in boost even when the wheels aren't on the ground.

I've raced multiple turbo cars in auto-x as well as road races, hardly an issue. Do some data logging and you can dial in the setup nicely.

 

Fastest cars in the world... And check out that TURBO.... LMAO Wouldn't want to use a blower because of belt slip, rob power and slower then turbo car. Blower cars can't be faster then a turbo and they are just So..... Inefficient. 😃😄😅🤣😂

 

Post's terrible picture of all out race car that gets torn down and rebuilt every pass LOL... I can't count how many times I watch those guys throw blower belts while making a pass....

"Take that you 9 second turbo street cars!!!"

 

Belt slip whats that?

 

You wouldn't know you have a vette kit lol

 

×10!!!

 

Its what happens when you take your bitch mittens off and run 25+ PSI.

 

Lol.
My car doesn't even make enough to power to run that blower at the power level those guys run.

 

Bitch mittens is a new one. Not sure I need 25psi to achieve anything.

 

Top fuel dragsters run turbos too.....oh wait!!!!!

 

People here use top fuel motors on their road cars ?