jonnyporsche
PCGB Member
I'm about to buy a TiAL F38 wastegate so my question is what spring should I order with it presuming I run standard chips, I have heard that it should be the same as max boost ie. .08bar 11.6psi am I right or wrong[8|]
Wastegate spring help please
- Thread starter jonnyporsche
- Start date
jonnyporsche
PCGB Member
I've got a Lindsey MBC
The waste gate spring will be the lest amount off boost you can run. So without anything else your tuning it off the waste gate spring. If you get a 1st spring you won't be able to run less then 1bar however with Mac or etc you can run more. Get the spring to suit your lowest boost setting.
George Elliott
New member
Agreed.....a heavy spring load makes the wastegate difficult to open/close gently and smoothly, and that will affect the boost smoothness and accuracy.
my 2p
George
944t
jonnyporsche
PCGB Member
Does the same apply to a MBC? sorry if it's a dumb question but I'm on a bit of a learning curve with this.
Thanks guys for your input it really helps.
TTM
Well-known member
An MBC should let you reach whatever peak boost you are aiming at since it is simply an additional spring added to the boost control line that is being compressed as you adjust it.
The standard wastegate spring is rated to 0.4 bar, and all of us who have used MBCs have always been able to adjust peak boost to anywhere between 1.0 and 1.5 bar, or even perhaps more, but a standard-ish engine won't really like it.
The value of 0.4 bar corresponds to the limp mode of the engine, as the cycling valve (standard solenoid) will stay open and it is not possible then to get more boost than what the wastegate spring allows.
While modern ECUs triggering EBCs work on a PID algorithm (PWM output), the standard KLR works on a PI algorithm. There is no Derivative gain. Just for your information
The standard wastegate spring is rated to 0.4 bar, and all of us who have used MBCs have always been able to adjust peak boost to anywhere between 1.0 and 1.5 bar, or even perhaps more, but a standard-ish engine won't really like it.
The value of 0.4 bar corresponds to the limp mode of the engine, as the cycling valve (standard solenoid) will stay open and it is not possible then to get more boost than what the wastegate spring allows.
While modern ECUs triggering EBCs work on a PID algorithm (PWM output), the standard KLR works on a PI algorithm. There is no Derivative gain. Just for your information
jonnyporsche
PCGB Member
Thanks for the info it really is helpful.
While modern ECUs triggering EBCs work on a PID algorithm (PWM output), the standard KLR works on a PI algorithm. There is no Derivative gain. Just for your information
I wish I was clever [8|]
TTM
Well-known member
Nothing about being clever, just being informed.
Here is a doc explaining it pretty well :
http://www.motec.com/forum/download/file.php?id=71&sid=f438d2b05245b8e93b2de1f3e4ebfc43
A natural human "PWM controller" is how we instinctively steer a car into a long curve, which is something we are normally taught at the driving school - the further we look into the apex of the curve, the cleaner our line will be as we instinctively correct our line in the curve through continued/minimal steering inputs []
Here is a doc explaining it pretty well :
http://www.motec.com/forum/download/file.php?id=71&sid=f438d2b05245b8e93b2de1f3e4ebfc43
A natural human "PWM controller" is how we instinctively steer a car into a long curve, which is something we are normally taught at the driving school - the further we look into the apex of the curve, the cleaner our line will be as we instinctively correct our line in the curve through continued/minimal steering inputs [
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