stubbsy351
Member
hey guys whats this egr/butterfly mod? ive seen a few people have it listed in there signature?
tweak'e said:if you have egr blocked i would disable swirl valve. with your chip it may make quite a bit of difference.
While idling and during low engine speed operation, the swirl control valve closes. Thus the velocity of the air in the intake passages increases, promoting the vaporization of the fuel and producing a swirl in the combustion chamber.
Because of this operation, this system tends to increase the burning speed of the gas mixture, improve fuel consumption, and increase the stability in running conditions.
Also, except when idling and during low engine speed operation, this system opens the swirl control valve. In this condition, this system tends to increase power by improving intake efficiency via reduction of intake flow resistance.
yes/no. i'm told that many DI motors are 18:1 even with atmo motors across different manufactures. IDI NEEDS the higher compression because it looses so much heat in the flame port. ie its inefficient and requires the extra compression to get enough heat to ignite the fuel.The puff of smoke is unburnt fuel. At 500rpm the engine would be developing fark all torque.
Dont forget these engines are low compresion engines and rely on boost to make the power. A TD series engine would easily pull from 500rpm but there compression ratios are 22 to 1. A QD32 would do the same aswell.
EGR stands for Exhaust Gas Recirculation.
Dave.
Yeah I understand that Dave, I know I'm expecting too much from the ZD30 to rev that low, I just tend to let the clutch out most of the time before I even touch the accelerator, probably explains why my clutches last forever. :18:
I've just had a read of the service manual for the ZD30 and I'm unsure opening the swirl control valve will improve things, according to the manual it is only ever closed when the coolant temp is above 50 degrees C, and engine speed is below 1250 rpm. Opening the valve below this engine speed to my thinking could actually be detrimental due to the lower intake velocity, while there is more air with the valve open, the lower intake velocity means less swirl in the bore, and therefore a less efficient burn.
Here's what the manual says regarding the swirl control system.
I'll try it out anyway to see whether it improves things or not since it's super easy to try, all that is needed is to unplug the solenoid that controls the vacuum to the actuator.
The thinner the better Jon, if you go too thick it could deform the shape of the EGR tube, if you were to do it on the EGR valve side, rather than at the exhaust manifold you could get away with cutting up a coke can in the shape of the gasket. If you go on the exhaust manifold side you will need to go to something heavier due to the amount of heat it will have to deal with there.
Hi tweak'e can i just unplug the red swirl solenoid plug?
as i cant get on the uk site and i can't remember what you told me last time
thanks i will see if this helps mine from bogging on take off
thanks mike
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