Boost reference location????

[Chuck Leeper]

Here's an interesting thread from the bullet, on boost pressure sources.
Comments from the guy that designed, builds the Boost Leash is something I never considered.

http://www.yellowbullet.com/forum/showthread.php?t=2035906

 

[pacecarta]

read it ..still dont see any knowledge

 

[No disintegrations]

Here's an interesting thread from the bullet, on boost pressure sources.
Comments from the guy that designed, builds the Boost Leash is something I never considered.

http://www.yellowbullet.com/forum/showthread.php?t=2035906

That's got to be a typo where it reads "compressor outlet least heat" Compressing air makes it hot, not just the engine being hot.

 

[Chuck Leeper]

I didn't say it was earth shattering news...I'm sure some already knew what was in it...
I found it interesting... You didn't, so what.

 

[1952ray]

I didn't say it was earth shattering news...I'm sure some already it...
I found it interesting... You didn't, so what.

Thanks for sharing Chuck, it was a worth while write up. Interesting read

 

[jasjamz]

Nice, but I always laugh when we call ourselves outsmarting GM engineers.
On a stock car a line comes off the compressor to the grey "y" and then to the solenoid and wastegate.
I replace the solenoid with a Turbonetics bleeder valve. Done!
I guess the fancy electronic controllers are better... or are they?

Nice link Chuck! I'm sure more will chime in on the Bullet. I have learned a ton there. Always good info there

 

[dank GN]

I would say you would want to reference the boost from the plenum . And for the waste gate I always go off the compressor housing so you get the fastest response

 

[Jerryl]

Deleted after reading post from Pace.

 

[pacecarta]

boost reference for gauge o map (speed density) should be after throttle body , thats the pressure the motor sees ..if its at turbo it wont take into account the pressure drop across the intercooler and will be higher
the YB thread was asking "wastegate reference" which is usually the source for the base of an external gate (bottom and top on manifold mode dual port ) and a point brought up was vacuum being bad and sucking in exhaust ..thats not a problem on every gate as some seal very well and some have diaphragms detached from the gate valve turbonetics and the stock style is external ,but we really arent talking about external in that thread. also not a real issue as its very minor amount and will only be an issue at low vac and most ecus would or could be adjusted for the slight af change . point was made that gates dont like vac, maybe .. some gates i guess could have an issue with vac
again not an issue as most would source for gate from the turbo outlet . the outlet at the turbo has lowest vac when throttle is closed , also has the highest pressure vs after ic or in the plenum due to intercooler restrictions could be 5psi or more depending on ic and air flow . the higher pressure is not an issue and can actually help hold gate closed in dual port mode as you now have the higher pressure available to apply to the top of gate to help hold the gate closed when running a lighter spring
best way to regulate with dual electronic solenoids and a controller is dual port wastegate mode with the controllers map sensor reading the pressure at top of gate for closed loop control and using C02 to the top of the gate regulated by the solenoids (one to increase one to vent and decrease ) , gate reference from turbo should be run to port at base of gate . the pressure seen at top of gate by controller wont be what your boost is (boost will be pressure +spring give or take depending on exhaust backpressure ) but its easier and faster for the controller to regulate the gate than the pressure at the plenum which is a delayed from what the gate does and can causes boost cycling up and down as it chases its self to maintain target boost

so after all this
best source for "gate reference" is at the turbo outlet

 

[Nick Micale]

This is an "interesting" thread, but it is not applicable to 99% of the turbo Buicks on this board!

On a street car, it really does not matter if the boost can be very accurately and instantly changed, but it is mandatory when in competition.

Between rounds when ambient and engine temps change, it is usually necessary to adjust boost up or down by 1 psi.

Like Paul stated, CO2 and solenoids on an external gate is an excellent method.

With my dash mounted boost control panel, it would accurately adjust boost in 1 psi increments.

The boost source I use is from the intake direct to the MAP sensor.

There are some electronic boost controllers that use solenoids to control boost without CO2, and I will be trying a TurboSmart unit on a street car which is simple and inexpensive.

 

[Ktbregal]

Subscribed and very interested in that Nick.