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#21 ·
ok so tonight I put the egt blocking plate back in and watched the boost gauge closely on the drive home from work.

I have been taking very close notice of what it has been doing for the last couple of weeks and checking what boost it has at what speed/load etc and I could not notice any difference with the plate in.

Certainly not obvious anyway. By my reasoning I am thinking that I will not have any real problems with egt's.

I am not sure if it is in my mind or not but I have a feeling it is not blowing as much smoke either.

I have noticed an improvement in smoke now it has racked up a few km 11000 compared to when it was new anyway however.
I also have an exhaust and k&n and have opened up the air box as of tonight too.

Just on the airbox mods. I think I may well put it back to standard as it makes a **** load of noise now. I actually don't really mind but I think the missus will disaprove! lol

My last tank of fuel too just for interest sake has netted 440 odd km to half way on the gauge so I think economy may be improving slightly even though I have never really got over 10.5l/100km.
 
#22 ·
4.8GU said:
My last tank of fuel too just for interest sake has netted 440 odd km to half way on the gauge so I think economy may be improving slightly even though I have never really got over 10.5l/100km.
Click to expand...
440 km's on half tank is about 275 miles which sounds quite good :thumbleft: normally around 245 miles or 392 km's - an improvement :partycheer:

10.51/100km's by my calcs is 27 mpg - they all seem to produce about that. But still, it's a good looking beast :dance: - life has it's compensations :thumbright:

Matt B.
 
#23 ·
don't forget the ECU will learn the change and adjust. check fuel usage in a few weeks time.
 
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#24 ·
Now that you say that about the ecu I think that when I first put the egr plate in it did feel a bit different but seems to go harder now. Could be the airbox mods though.
I will see what sort of fuel economy I get now that the egr plate is in

Very hard to prove anything as it is all seat of the pants type thing. Fuel economy is the only thing that will be easily tested and accurate.

My only concern now is the ecu throwing a code after a period of time.
I really can't see that the system is that smart though as the way I have blocked it off the valve will still be opening to let egr in the motor but it just wont be getting any. Over time the egr cooler will block up big time though so I will probably try and block it on the other side before the cooler.

I will try and put it on the dyno next week to check the fuel ratios too as this will tell me if it is blowing less smoke.

Hope to have my intercooler upgrade up and running soon too so that will be interesting.
 
#25 ·
the ECU works out the EGR flow by the drop in air flow through the MAF. if it notices there is no change in flow so it should throw a code. however some simply store the error code in the ecu without alerting the driver.

its a case of try it and see.

fual economy is not always an easy thing to measure. good records is a must and is done over a decent period of time.
 
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#26 ·
I have been taking note of fuel economy from new so should be able to notice if there is any real change. I only ever measure after a full tank.
Today I measured last tank at 9.3l/100km. This was a mix of highway (250odd km) and the rest town. Not babying it either so I am happy

I have a bosch scan tool at work (while it isn't great it can generally read error codes) and it has not shown any codes as yet.

How does the air flow thru the maf change with egr? I am crook at the moment so trying to think how it is all set out is increasingly difficult :roll: :puker:

On a side note with the boost. I have t'd into the boost sensor on the outlet side of the intercooler and it is quite funny to watch the boost climb from 0 to about 5 psi when decelerating. I am guessing it is because of the butterfly closing and building up inside the pipe work.
 
#27 ·
4.8GU said:
On a side note with the boost. I have t'd into the boost sensor on the outlet side of the intercooler and it is quite funny to watch the boost climb from 0 to about 5 psi when decelerating. I am guessing it is because of the butterfly closing and building up inside the pipe work.
Click to expand...
no egr butterfly on the D40. no need, the variable turbo does the same job. its just the turbo vanes closeing to keep back pressure up to keep egr flow up.
 
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#28 ·
Excellent, this is the kind of thread that was the reason for wanting to join up here :D. I've got some steel plate that I'm going to get cut for blanking off my EGR, but have had similar concerns as already been posted. I've got an EGT gauge with peak/warning and boost guage on standby which will be fitted before the EGR gets blanked. I'll be keeping a close eye on this thread and eagerly await your results!

The thought of all that black stuff getting into the engine and clogging the intake manifold is a nasty one...here's an example I found a little while back of a YD22 intake manifold (dont know yet if it's the same as the YD25 one):

Image
 
#29 ·
Ok sorry I been so slack but I have not had the time to put the car on the dyno.

I have been keeping a close eye on fuel economy though since refitting the egr plate and my last half tank of diesel worked out at under 9litres/100km.
My gauge is actually quite accurate too as it took 41 litres with the gauge on half way.

Definitely less smoke. Boost does come down a bit at highway cruise but I need to check this with the plate out also to compare

I am yet to get my dump pipe done too so no egt gauge yet either. So once again sorry for the delay but I will get there in the end. :oops:
 
#30 ·
Hi lads, i just want to know a few simple things. 1. will blocking the egr harm my engine? 2. where is the best place to block it [if somebody has a picture to show this that would be great]? thats all cheers. and fuel economy and emissions doesnt bother me as i have my diesel paid for and i can just take the blocking plate out before testing.
 
#31 ·
sean84 said:
Hi lads, i just want to know a few simple things. 1. will blocking the egr harm my engine? 2. where is the best place to block it [if somebody has a picture to show this that would be great]? thats all cheers. and fuel economy and emissions doesnt bother me as i have my diesel paid for and i can just take the blocking plate out before testing.
Click to expand...
1 } no harm your engine, but increase respond and power
2 } Plate to OUtlet From manifold to EGR Input pipe flange( Before EGF Cooler )
3 } Increase Emission.
 
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#36 ·
2.5TD said:
Might stop the valve operating though :?
Click to expand...
Exactly. Hence I said 'disabled'. I'm interested because if you block the EGR off an engine management light is thrown up. The 'remap' could help work around this. Not sure you thought that one through warpa :D
 
#38 ·
I did this at the weekend and have doen 2-300 miles now. No engine management light. Maybe a slight bit less hesitation when you put your foot down but not a massive gain.
 
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#40 ·
How much it will increase boost pressure ?.. stock max boost pressure at 1.35bar. could spike to 1.55Bar.. just while only
 
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tgiannak
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