How many run without EGR?

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super7mgtepower

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Apr 2, 2008
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Lot of these people are running without. Ive decided to keep mine Because its fixed for now (just hammered it) but when i have the necessary components to run without its history. This car is not my daily my daily is my bike or my LS. So i wasnt really concerned about safety.
 

Godspeed

88 supra turbo 5spd
May 13, 2005
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so then is this natural to happen without the egr system? i actually did read this but i still wanted to ask... so will it do this until i get the egr put back on it?
 

Supra87T

2-Tone BLUE
Feb 23, 2006
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Godspeed;1134360 said:
so then is this natural to happen without the egr system? i actually did read this but i still wanted to ask... so will it do this until i get the egr put back on it?

Not necessarily natural for it to cause that.... no EGR causes detonation at part throttle which could potentially blow the head gasket which may be your problem. Have you checked your compression or see what's causing the car to overheat?
 

Poodles

I play with fire
Jul 22, 2006
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If one person can tell me a good enough reason to ditch EGR on a car without a standalone, I'd like to here it...

And I'll restate this, a piggyback isn't enough control as it's fuel AND timing that are the issue. Can you get away with it? Sure, is it a good idea? Not really...
 

grimreaper

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Jul 2, 2008
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Poodles;1134383 said:
If one person can tell me a good enough reason to ditch EGR on a car without a standalone, I'd like to here it...

And I'll restate this, a piggyback isn't enough control as it's fuel AND timing that are the issue. Can you get away with it? Sure, is it a good idea? Not really...

Would the maftpro be considered good enough to go egr less? Assuming part throttle tracking is used...
 

Poodles

I play with fire
Jul 22, 2006
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Last I knew it didn't have timing control...

It's aggressive timing coupled with less fuel when the ECU is expecting the EGR to be open. As most piggybacks trim fuel using the AFM signal, timing can't be controlled independantly and can cause issues.

Someone will probably argue with me, but this is strictly my opinion that most cars that the main difference between the MKIII crowd and the MKIV crowd is that they go standalone and get good tuning before we do...
 

tlo86

Ninja Editor 'Since 05'
Jul 24, 2005
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Poodles;1134398 said:
Last I knew it didn't have timing control...

It's aggressive timing coupled with less fuel when the ECU is expecting the EGR to be open. As most piggybacks trim fuel using the AFM signal, timing can't be controlled independantly and can cause issues.

Someone will probably argue with me, but this is strictly my opinion that most cars that the main difference between the MKIII crowd and the MKIV crowd is that they go standalone and get good tuning before we do...

:word8kn:
 

Poodles

I play with fire
Jul 22, 2006
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The only thing you have to gain from not running EGR is less carbon buildup in the manifold...

With gas prices the way they are, you're going to like not having to richen it up as well...
 

dumbo

Supramania Contributor
Jul 16, 2008
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Not to rob the thread but...
How do the EGR systems differ from the GE to the GTE? All i could notice is that the diaphram that connects to the manifold,(on the GE has 2 vacum hoses coming from TB to the and the GTE only has one)
 

jdub

Official SM Expert: Motor Oil, Lubricants & Fil
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Feb 10, 2006
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The EGR on the GE motor is temp, rpm and vac pressure delta dependent (hence the 2 TB ports). Above 5200 RPM the EGR is inop. Below 4800 RPM and above idle it is inop when the pressure delta is low between ports. This scheme is to improve engine response under certain conditions.
 

jetjock

creepy-ass cracka
Jul 11, 2005
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Redacted per Title 18 USC Section 798
The GE uses two stage ported vacuum to control the EGR valve (via the modulator) while the GTE does not. Basically that means during the first stage on a GE when only the first TB port is active the amount of EGR delivered is related to the amount of exhaust back pressure. At higher throttle openings (when the second port is uncovered) EGR will be delivered even if exhaust pressure is low. On the GTE's single ported system the amount of vacuum the modulator sends to the valve is always dependent on exhaust pressure since thanks to the turbo there's no shortage of it...
 

jdub

Official SM Expert: Motor Oil, Lubricants & Fil
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Feb 10, 2006
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JJ - the diagram (TSRM EC-12) shows the EGR valve closed when pressure chamber pressure is low. You're saying the valve is actually modulated depending on the pressure differential when the TB is between the ports?

Grim - :bowdown: JJ is way better than me on most aspects of this car, especially the TCCS and electrical
 

Godspeed

88 supra turbo 5spd
May 13, 2005
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ok i just got home from a little crusin and my car started getting hot after about 30 min. so i pulled over and let it cool down then i shut it off hung out for about 30 more min. and started to leave but when i tried to start the car it would start sputter and shut off????? wtf now so i checked to see if any of my ic pipes had come loose but they had not soooo i tried to start it again same result... finally i started it and gave it a little gas and i drove away and it seemed to stay running ok... im lost on this one... still no smoking, good oil psi, solid power until the big 5psi lol and it gets so hot that you cant even touch the rad support hardly any ideas?????
 

SySt

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Mar 30, 2005
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Had my Supra for 5 years now. Bought it with a 7M-GTE in it. It did not have an EGR system then. Still has no EGR system with my LS6. Doubt it makes a noticeable power difference but certainly doesn't hurt power production. The most noticeable aspect is freeing up space to work on the car with.
 
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