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Discussion Starter #1
Hi guys!

My local tuner could finally give me a EGR removal software.
First impressions... WOW! What a difference! Especially the fuel consumtion has improved significantly.

My question is. Do I also have to block off the EGR valve with a blanking plate or something? If I remember correctly the EGR is still at 4,7% even at WOT.

Regards
 

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Registered
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Discussion Starter #3
Even when the EGR is removed from the software?
 

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#MrGrumpy
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13,117 Posts
It depends on the method of removal - for example I believe the Premier Tuning "EGR off" map will still test the valve's operation and hence cannot be blanked off.
Relic would be the most informed person to ask here.
 

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Bye bye Honda...
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5,788 Posts
Hi guys!

My local tuner could finally give me a EGR removal software.
First impressions... WOW! What a difference! Especially the fuel consumtion has improved significantly.

My question is. Do I also have to block off the EGR valve with a blanking plate or something? If I remember correctly the EGR is still at 4,7% even at WOT.

Regards
So you've had it done, but not sure if the EGR valve has been fully disabled? Maybe when it's only disabled in the ECU the valve still 'leaks' a certain % (e.g. not designed to close fully?). I'd want to fit a blanking plate just to ensure no EGR was happening, but this might upset the ECU if it is expecting a small amount of EGR?
 

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Cockup Specialist
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12,885 Posts
It doesnt leak air....if you dont request MAF less than actual MAF.
It seasy to test this calculating the VE from the rpm maf map and iat.
When EGR is active VE drops right down to 50% or something.
When EGR is shut the VE recovers to around 85%

Built into HDS is an EGR test function that can be run manually.
The code for this function is in the ECU...HDS just calls the subroutine AFAIK.

The ECU conducts numerous tests on startup.
One of which is this EGR function which will fail if you plug the EGR.
Judging from the fact the CEL appears on startup if the EGR is plugged.

Have I seen the code for this function in the ECU ..no..but we know it is there from HDS.
Do I know for certain it runs on startup....thats the only thing that explain the CEL.
As no exhaust gas is flowing when mapped out in normal running and gives no errors when done properly.

It doesnt actually flow 4.7% EGR....this is actually just a minimum number in the map when open loop.
The EGR is in fact shut.
For the same reason you cant request less than 15% duty in closed loop.

OPen and closed loop is regulated b ythe hysterisis maps.
Basically if you request more fuel than the upper map egr goes openloop.
If you request less fuel than the lower map the EGR goes closedloop or MAF feedback.

459.67 Rankine
639.6 Gas Constant
134.496332 Displacement ~ IN3
IAT (Farenheit)
MAP (a-psi)
MAF (lb/min)
VE% =100*(MAF*GAS*(RANKINE+IAT)) / (MAP*(RPM/2)*INCH3)
 

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Premium Member
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1,180 Posts
I got egr off map plus blanking plate between engine and valve. I think it is on for 3 months without any problems accept little slip sometimes.:)
 

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Cockup Specialist
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12,885 Posts
I got egr off map plus blanking plate between engine and valve. I think it is on for 3 months without any problems accept little slip sometimes.:)
Would be good to see how that continues when the air temp rises and EGR switches on.
Is the blanking plate drilled ?

What does 'little slip' mean ? :)
 

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Premium Member
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1,180 Posts
little slip=clutch problems. This is full plate made with steel. It looks like full big gasket when you change them during a cleaning.
 
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