safe egt's on stock block
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Joined: Dec 2005
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From: Japan
Originally Posted by Inn-Tune
An accurate, fast responding, properly installed EGT gauge can be a very usefull device. If what you meant to say is you shouldn't tune air/fuel with an EGT gauge alone, that is true. I recommend using a wideband and EGT gauge in concert.
During tuning as you turn up the boost, EGT's are a great indicator of when your system's efficiency is falling off. This way you can stop before knock or power loss on the dyno appear if absolute maximum power output is not your goal as with all street cars.
EGT gauges are also a great warning device after a car has been tuned. They don't pinpoint problems by themself, but several different types of issues will generate high EGTs. Some examples are vacuum and/or charge pipe leaks, overboost, detonation/pre-ignition. (Leaks and overboost conditions result in the turbo being over-spun generating extra heat)
During tuning as you turn up the boost, EGT's are a great indicator of when your system's efficiency is falling off. This way you can stop before knock or power loss on the dyno appear if absolute maximum power output is not your goal as with all street cars.
EGT gauges are also a great warning device after a car has been tuned. They don't pinpoint problems by themself, but several different types of issues will generate high EGTs. Some examples are vacuum and/or charge pipe leaks, overboost, detonation/pre-ignition. (Leaks and overboost conditions result in the turbo being over-spun generating extra heat)
PS I came from the honda/nissan world and I know that when a honda or nissan motor is built; cylinder #3 is the one that gets the hottest. Is it the same for 4g63's?
Most people use #1 or #2 on Evos. I'd like to see a stock Evo with EGT's on all 4 as a good baseline, but for now I recommend #2 rather than #1 since it takes heat from 2 neighboring cylinders.
Originally Posted by kike_4g63IV
where is the right place to install an EGT probe? cylinder #3(second from left to right)? or downpipe? if in down pipe; how much are the readings supposed to be?
PS I came from the honda/nissan world and I know that when a honda or nissan motor is built; cylinder #3 is the one that gets the hottest. Is it the same for 4g63's?
PS I came from the honda/nissan world and I know that when a honda or nissan motor is built; cylinder #3 is the one that gets the hottest. Is it the same for 4g63's?
We and many others believe the 4g63 has most often run cyl 2 as the hot or lean cylinder. Part of the decision lies in the fact that the engineers at
have placed the knock sensor on the back of this cylinder as well, likely for this same reason.We have knocklink and EGT running off cyl #2 and tap all of our client cars this way.
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Joined: Dec 2005
Posts: 54
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From: Japan
Originally Posted by Inn-Tune
Most people use #1 or #2 on Evos. I'd like to see a stock Evo with EGT's on all 4 as a good baseline, but for now I recommend #2 rather than #1 since it takes heat from 2 neighboring cylinders.
An EGT sensor can definitely be useful. Last year I was running TBE and an XEDE with an appropriate map loaded. Everything was working great until I headed to the track. After about 10 laps I was starting to see elevated EGTs -- 950C to 1000C when normally I would see between 850C and 900C. It was an indication that something was wrong. What it ended up being was that even with these light mods I was exceeding the capacity of the fuel pump after prolonged track use. A Walboro 255 solved this completely 
Either way the EGT gauge gives me confidence that everything is working correctly.
Would I tune with it - no. But it does give good piece of mind that everything is working correctly.
Either way the EGT gauge gives me confidence that everything is working correctly.
Would I tune with it - no. But it does give good piece of mind that everything is working correctly.
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Joined: Dec 2005
Posts: 54
Likes: 1
From: Japan
Originally Posted by TTP Engineering
This like many other opinions has been discussed for a long time.
We and many others believe the 4g63 has most often run cyl 2 as the hot or lean cylinder. Part of the decision lies in the fact that the engineers at have placed the knock sensor on the back of this cylinder as well, likely for this same reason.
We have knocklink and EGT running off cyl #2 and tap all of our client cars this way.
We and many others believe the 4g63 has most often run cyl 2 as the hot or lean cylinder. Part of the decision lies in the fact that the engineers at
have placed the knock sensor on the back of this cylinder as well, likely for this same reason.We have knocklink and EGT running off cyl #2 and tap all of our client cars this way.
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