EGR Block Off Plate
- Thread starter ThirstyMKthrice
- Start date
More than likely it has NOTHING to do with the EGR cooler.
I bet it's the 90 degree hose in the back of the head that is leaking. The only other thing that could be leaking coolant with the EGR cooler would be the large coolant passage plug in the back of the head, and using an EGR blockoff plate wouldn't help you with that either (you'd have to pull the head to fix it too)
I bet it's the 90 degree hose in the back of the head that is leaking. The only other thing that could be leaking coolant with the EGR cooler would be the large coolant passage plug in the back of the head, and using an EGR blockoff plate wouldn't help you with that either (you'd have to pull the head to fix it too)
It's ok. I appreciate your knowlege.
Didn't somebody do a temp test, and got lower temps with the EGR ON? (don't remember where they were testing the temps though)
Didn't somebody do a temp test, and got lower temps with the EGR ON? (don't remember where they were testing the temps though)
billspreston01;1056756 said:
Yes.
jdub... do you know if there are any other differences in the JDM ECU, not including the EGR difference?
I know I already asked but I figured I'd try again
Yes, in fact they did...
None the less, you WILL go lean at low RPM high load... Go up a hill on the highway and the engine builds boost, you may get knocking.
It doesn't decrease performance in any way (on our engines, in this discussion), and will only increase gas milage and lower the detonation threshold.
EDIT: JDM ECU has speed cut as well, apart from that I dunno. If you find a Mine's upgraded ECU, it may be tuned for larger injectors, higher redline, ect as well...
None the less, you WILL go lean at low RPM high load... Go up a hill on the highway and the engine builds boost, you may get knocking.
It doesn't decrease performance in any way (on our engines, in this discussion), and will only increase gas milage and lower the detonation threshold.
EDIT: JDM ECU has speed cut as well, apart from that I dunno. If you find a Mine's upgraded ECU, it may be tuned for larger injectors, higher redline, ect as well...
When they put something on a car to make it run correctly ( THERE IS A REASON FOR IT THEN! ) The o2 sensor sends a signal to the USDM Ecu, so it needs to know the NoX levels o2 levels co2 levels in the exhaust taking it off is pointless, stupid, and arrogant if you think that wills top cylinder number 6 from blowing the head gasket there. Just leave the Erg there and get over it, unless you want to upgrade go with a stand alone, and for god sakes this these threads come up and many of us have to explain to people the problems associated with this ( I should save this in Microsoft word and just copy and paste this )
Toyota Techs > Erg Taker off'ers* ^^'
Toyota Techs > Erg Taker off'ers* ^^'
^ While I agree with leaving EGR intact the information in that post concerning the O2 sensor is mostly nonsense.
Unlike Jdub I gave up long ago but I'll say this one final time: EGR was originally developed and used for detonation suppression. It's ablity to reduce NOx was a side benefit that wasn't used until many years later.
Quotes from various Toyota service training publications:
EGR Impact on the Engine Control System:
"The ECU considers the EGR system an integral part of the entire Engine Control System. Therefore the ECU is capable of neutralizing negative performance aspects of EGR by programming additional spark advance and decreased fuel injection during periods of EGR flow. By integrating fuel and spark control with the EGR metering system engine performance and fuel economy can actually be enhanced when the EGR system is functioning as designed."
Note the wording about increased timing and lowered injection. What will happen if the ECU does that expecting EGR flow to be there but it isn't? The manual provides an answer: "If EGR is commanded but doesn't flow severe detonation will occur".
From the section on how EGR effects emissions and driveability:
"Too little EGR will cause detonation and emissions failure. Because EGR tends to reduce volatility of the air/fuel charge loss of EGR typically causes detonation to occur."
Run sans EGR and you'd better, at minimum, up the octane. I won't go into the emissions part of this equation because the morally bankrupt self centered "it's all about me and what I want, screw everyone else" attitude among many owners, especially younger ones, is well known. I'm not going to change them. About all I can do is hope their engines keep blowing up...
Unlike Jdub I gave up long ago but I'll say this one final time: EGR was originally developed and used for detonation suppression. It's ablity to reduce NOx was a side benefit that wasn't used until many years later.
Quotes from various Toyota service training publications:
EGR Impact on the Engine Control System:
"The ECU considers the EGR system an integral part of the entire Engine Control System. Therefore the ECU is capable of neutralizing negative performance aspects of EGR by programming additional spark advance and decreased fuel injection during periods of EGR flow. By integrating fuel and spark control with the EGR metering system engine performance and fuel economy can actually be enhanced when the EGR system is functioning as designed."
Note the wording about increased timing and lowered injection. What will happen if the ECU does that expecting EGR flow to be there but it isn't? The manual provides an answer: "If EGR is commanded but doesn't flow severe detonation will occur".
From the section on how EGR effects emissions and driveability:
"Too little EGR will cause detonation and emissions failure. Because EGR tends to reduce volatility of the air/fuel charge loss of EGR typically causes detonation to occur."
Run sans EGR and you'd better, at minimum, up the octane. I won't go into the emissions part of this equation because the morally bankrupt self centered "it's all about me and what I want, screw everyone else" attitude among many owners, especially younger ones, is well known. I'm not going to change them. About all I can do is hope their engines keep blowing up...
billspreston01;1056756 said:
That was me...I got 50-100 deg C (depending on RPM) EGT temp drops with the EGR installed and functioning.
Justin;1056761 said:Yes.
jdub... do you know if there are any other differences in the JDM ECU, not including the EGR difference?
I know I already asked but I figured I'd try again
Other than the fuel/timing maps I'm not aware of any.
gofastgeorge;1057017 said:
LOL...don't you think I would have posted that if it had an impact?
:slap:
I'm not holding any info back George "just to prove I'm right"...I could care less "who is right", but I do care "what is right". What I saw did not result from additional fuel (a rich mixture). Nice try, but adding fuel is not the solution to what happens with no EGR...you have to be able to control timing. That means a JDM ECU or a standalone...your S-AFC is not going to cut it
Just to make it perfectly clear, these temps were are cruise between 2000-3500 RPM (where the EGR functions). My AFR's (on a wideband) varied between 13.0 and 15.2 with easy throttle manipulation, steady state AFR was 14.7 +/- 0.2. As RPM increased and stabilized, AFR decreased and EGT would climb from the previous temp, then decrease as AFR went back to stoich. All just as you would expect on a stock ECU...the difference is EGT would peak and stabilize lower than previous readings without the EGR.
jetjock;1056981 said:
kisedcd;1056474 said:
Betting this is a younger member.
Also, I have read enough! As soon as I get time to do the work, I will gladly beat suprasport's price on a set of blockoffs.
^That's where I was leading to when I said I would sell my block offs. But I have more important things to worry about at the moment. The sad part is, if I listed them for sale, they would sell pretty quick. I should just trash them.
Thanks for all of the great information
Thanks for all of the great information
jetjock;1056981 said:
I really hope you are right (which you most likely are) since I just spend the entire day putting back my EGR system because of this post. I had blocked it off since my EGR valve had died on me - stuck in the open position. But now evertything is back together with a new EGR valve. What a royal pain in the a... to exchange.
Anyway has anyone actually destroyed their engine because of a missing EGR system? Of course I realize that when an engine dies it can be difficult to tell what caused it.