Ok,
While I'm not the first to post about the EGR mod (my car is a YD25), I do know a thing or two about engines so I thought i'd post my experiences.
Today I made up a blanking plate - i mounted it on the left right next to the EGR control valve / just after the exhaust cooler pipe. Why? Because its the easiest to get to, and location should make little difference if any.
Result: Engine is a whole lot nicer before boost kicks in. This is basically because the EGR is open at idle and part throttle.
Because the EGR is now blocked off, the entire intake system is no longer being filled with exhaust gas while you idle, and the engine doesn't have to suck it all down when you try and take off at part throttle.
Some stats (taken from OBD-2 Port with Diag Tool):
Without EGR Mod:
~11 grams / second of air consumed at idle
~30 degree intake temps
With EGR Mod:
~16 grams / second of air consumed at idle
~20 degree intake temps
Basically, this means at idle, without the EGR mod, roughly 30% of the air going into your engine is exhaust fumes... No wonder it hesitates!
Additionally, the air is now cooler and hence denser, and more fuel can be burnt, more efficiently!
Cheers,
xtturbo
While I'm not the first to post about the EGR mod (my car is a YD25), I do know a thing or two about engines so I thought i'd post my experiences.
Today I made up a blanking plate - i mounted it on the left right next to the EGR control valve / just after the exhaust cooler pipe. Why? Because its the easiest to get to, and location should make little difference if any.
Result: Engine is a whole lot nicer before boost kicks in. This is basically because the EGR is open at idle and part throttle.
Because the EGR is now blocked off, the entire intake system is no longer being filled with exhaust gas while you idle, and the engine doesn't have to suck it all down when you try and take off at part throttle.
Some stats (taken from OBD-2 Port with Diag Tool):
Without EGR Mod:
~11 grams / second of air consumed at idle
~30 degree intake temps
With EGR Mod:
~16 grams / second of air consumed at idle
~20 degree intake temps
Basically, this means at idle, without the EGR mod, roughly 30% of the air going into your engine is exhaust fumes... No wonder it hesitates!
Additionally, the air is now cooler and hence denser, and more fuel can be burnt, more efficiently!
Cheers,
xtturbo