I installed my Zeitronix set up this week and understand everything involved with it except: EGT Temps and whatthey mean....

I did a little research on what "Proper" or "Normal" EGT Temps should be and this is what I found:

Freeway cruising at 80MPH 1250° to 1350°
Around town in traffic 950° to 1150°

I guess what I want to know is where my EGT Temps should be at WOT and Full Boost. I just played back some Data fromthe other night on the Zeirtonix unit and at WOT, 1.3 Bar - my EGT's were ranging from 1600F - 1700F....

Anyone familiar with EGT Temps and what Normal / Good Temps are and what would be considered "High" or Dangerous.....

I guess I am not understanding the whole EGT feature and its purpose?

Please advise!

 

I've been wondering what to watch for regarding EGT's also.

 

I know, me too... At the risk of sounding stupid, I thought I would ask?

 

I bought a leather 3 pod "A" pillar gauge pod I have yet to install. It came with a AEM AFR gauge (SAM if your reading this you didn't sent the o2 sensor), a boost gauge and an EGT gauge. I've been wondering if I should keep the EGT or replace it with something like oil temp???

 

EGT is a fairly useless gauge. EGT's are a trailing indicator. Some people claim to tune w/ them (and they very well might) but A/F is what you need to watch - if you've got good A/F, your EGT's are fine.

-chuck

 

what many people do is get an EGT gauge and then go get a good tune. Based on the fact that they know that the equipment used to tune the car is accurate they can know about what their egt should be. If it is to hot then you are running to lean and if it is too cool then you are running righ. It is better to have a good wideband AFR gaude like an AEM

 

There are basically three popular ways to tune cars, Air/Fuel, Lambda, and EGT.

Each has its benefits and detriments. If you tune solely on air/fuel you need to be very careful, sometimes tuners get lazy with tuning particular systems usually stand alones and don't fully tune the car, then you go for a top gear pull and its very feasible you will melt your cylinders. Thats where EGT's come into play, EGT's are an alright way to tune however also not the best since its not precise. Not even going to get into the problems with only tuning on EGT although given its a skilled tuner the programming can be spot on. I've seen it happen. Lambda however is the best and more precise way, in Europe most tuners tend to flow with tuning by Lambda, it is the most exact and favorable way to tune, why don't many people here do it? Its very temperamental, the slightest change in the fuel map can change the lambda by .01-.05

Regarding EGT's I don't have too much experience with the newer cars however 1700 does seem extremely hot. You should PM Stephen or any of the proficient tuners on this board and they'll tell you whats good.

 

What is lambda?

 

Lambda is a term used to describe a chemicaly correct A/F ratio of various types of fuels. In the case of gasoline lambda (1.0) is equal to 14.7:1 (stoich). If the ratio is rich you would have a ratio of less than 1.0, lean would be greater than 1.0. Each fuel has its own lambda such as Alcohol/Meth is (6.4) and diesel is (14.5).

 

Thanks for the reply. How/why is tracking lambda required if your tracking AFRs?

 

An AFR gauge is more then enough in out cars...
markski

 

What about I/C temps ?

AZ Exotic,
are you still running stock Intercoolers?????

Zippy: pic please to see how ricey the a-pillar gizmo looks,

thanks,

MK

 

origyns_973, i'm w/ zippy, what is your distinction between A/F vs Lambda? most A/F gauges these days read in lambda (ie, if you have 90% gas, 10% alcohol, it measure the mixture's lamba.)

as i implied earlier, and markski outright stated, EGT is not useful for day to day tuning. if you were running a 12-24 hour event then it might become somewhat useful; however, most of the tuners do not tune our cars to the ragged edge; repeated springs to 150-180-200+ should not push cylinder temps dangerously high (*unless* your're programming is off.)

- chuck

 

The distinction is the precision of the measurement thats all really.