Hey all, got a quick one for ya... I finally tapped my exhaust manifold for a greddy temp probe, and it works fabulous. My only concern is that the temps hover around the 700 degree Celsius just at normal cruising around town. If i'm right, thats around 1300 degrees F right? isn't that a bit hot? I mounted the probe about four inches from the head on the passenger side rear cylinder (#3, right?) when i'm cruisin around town, or even on the freeway for that matter, it hovers around 3000rpm, and i'm not on boost. that type of driving seems to keep the needle pegged right between 650 and 720 on the Celsius temp scale. Should i be worried about this at all?

thanks for the help. Ben

 

1300 degrees F is fine, that's perfectly acceptable. If temps start creeping up beyond 1550 into the 1600s, you have problems.

 

What mods do you have on your car?

High EGT's can be related to a number of things and their combinations.

Lean A/F mixture
Too much ignition retarding
Combination of the above

 

pretty simple stuff, for the most part

engine mods:

resonator box removed

HKS catback carbon/ti

Apexi AVC-r -- i posted my settings awhile ago, but in short,
its set to 1.0 bar for normal driving and there is a momentary
button that sends it to 1.05 for 15 seconds at a time

guages: factory boost, avc-r (boost, rpm, throttle position, speed), egt (greddy mounted 4" back from the head on #3) oil temp(probe on top of block under the intercooler)

I used to have an Injen CAI on, but its been off for a month now.
those are really the only engine mods i can think of.

the part that worries me is that just during normal driving when i'm around 3000rpm (not on boost, mind you) the egt still hovers around 700 degrees celsius. thanks for the help fellas, you guys rock.

 

yea mine ran about 1300-1350 bone stock i would not be worried.

 

i just watched it on the way to work this morning when i got on the throttle a bit, and when i went through a couple gears at WOT it crept up and stayed around 830 celsius (1526 F give or take)


do you think i should be worried now? thanks, Ben

 

Is the factory ECU still getting an EGT signal? If so, you shouldn't have to worry much, as it will enrichen itself to bring EGTs down. I imagine it is getting the signal if you don't have a CEL.

 

i have never had CEL, so if that answers your question, well there you go. Where is the EGT probe for the ECU? i just took off the whole exhaust manifold to tap it for the greddy probe, and there was a sensor on it right next to where it mates to the uppipe. i thought that one was an oxygen sensor, but i could be wrong, eh... thanks for the help

 

but from the research i did, its not usable. I could be wrong, but i think the only factory EGT sensor is the one in the uppipe that just waits for something like 1800 degrees and then it puts the car in a limp mode so you don't melt it down. As far as i know, the sensor in the exhaust manifold is the forward oxygen sensor and I don't think its usable for any type of guage you could mate to it. same with the egt sensor, i don't think there are any gauges out there that would be able to use the signal and display any accurate information. I bought the greddy Peak/Hold/Warning meters in 60mm. I just ordered the defi center pod to hold them. i'll take some pics for you when its in.

it only took me a couple hours to take off the manifold, drill/tap/probe it, and then reinstall. I reused the gaskets cause i'm gonna put in a new uppipe in a bit and i'll replace 'em then. the whole thing was pretty easy, just wear gloves so you don't smash your knuckles...

 

i'm with you vteg, i also hate cutting holes in new stuff, like my car. but... it wasn't hard, it doesn't void any warranty except the part you drilled a hole into, and it will provide you with useful, accurate information about the condition of your engine. i'm going to put in a different uppipe anyway, so i needed to have the probe in the exhaust manifold, and just like Akiata said, you need to have it as close as possible to the head for it to be accurate. if you do drill a hole in your exhaust, you MUST remove the part prior to drilling. with a normally aspirated car it doesn't matter much, you'll just spit the filings out when you fire it up. but with a turbo car, all those filings and shavings from the drill will get digested by the snail, and will most likely cause permanent damage. i'm sure you already knew that, but i didn't want it to go unsaid. i haven't priced it, but i'm guessing that if the exhaust manifold were to crack and need replacement, it wouldn't be that expensive of a part, and you can definitely do the work at home, easily. Hopefully i've alleviated your fears of drilling holes in the exhaust, cause you need to if you want your $$$ spent on an EGT gauge to be worthwhile... later guys, Ben