why on the wrc or gr A cossie; the temp sensor is olcated on the tb and not on the plenum ???

 

nobody ?

 

is it something to do with running anti-lag?

 

something to do with water injection maybe?

 

perhaps the real air temp is here, not on the plnum which has some heat from the head ... but not sure

 

the air would be bloody cold rushing through there fella,why on most cars you get coolant running through it,to try and keep the throttle body from freezing up

 

Im not so sure it would be cold? It is after the turbo (very hot on some setups), cooled by an intercooler (not always such a good one in most setups) and then 1 ft of pipe later it is in that throttle body, so the output of the intercooler is the temp the throttle body will see. Under load that will be hotter than "bloody cold".

If that small a surface area at a reasonably close to ambient temperature could really cool air in that short a period of time, we wouldn't need intercoolers.

I can't see why anti lag would want to see the temperature 1 nano second before it normally would, with the air temp in the plenum. Maybe the plenum is cast differently and they don't want to drill it? Even then that is a very random guess, as I don't know either, without seeing so much more of the engine and setup.

RW

 

Very true on a turbo set up!but think you woud be surprised how cold the air gets going through the tb!it wont be ambient temp thats for sure!

 

the throttle body should be in the region of 25-45 degrees really as if carge temps exceed that then your intercooler isnt really up to the job i wouldnt think they can ice up,

im not 100% sure here, but on the wrc escos plenum they run a anti lag valve in the side of the plenum just where the temp sensor normally is so maybe something to do with that, could be way off,

i will ask the old chap tomorrow he has one of the grp a throttle bodies at work im sure he'll know why

jim

 

hhmm i duno mate just that if you look at a normaly cossie throttle bodie (doesnt run anti-lag) that doesnt have one so i came to the conclusion that a grp a one will be runing anti-lag so it had something to do with the anti lag set up.i take it im wrong then

 

its heat soak from the cylinders, when the engine is running the valves open and close, when the throttle is shut i.e stage starts the heat sits in the plenum, thus t
excess heat to the sensor, thus massive ignition retard on stage starts i used to see 80 degs at time if the stages where 12 miles, then off the stage straight into another, its like trying to set off with the handbrake on slightly.

with it before the throttle plate most of the heat is kept in the plenum, away from the sensor.

though we did find we needed to recalibrate a few other settings to compensate for the distance away.

HTH

 

interesting to know!

 

thanks for that

 

no worries.