vangc6780

is it okay for riding past 1400 fer.
thats where my egt is at when i'm at 85-90mph
but its never over 1450 fer.
just carious????

Chris F

Sounds like your car is running stoich (~14.7:1) on the highway. Here's a cookie.



My car runs the same on the highway at relatively high speeds. I've seen close to 1600 during an HPDE, running hella rich though.

CallMeJesus

youre runnin lean when you run higher temps, meaning you are close to burnin a piston.

Chris F

https://honda-tech.com/zerothread?id=274901

You're fine. If your EGT probe is in your header (4-6" from the exhaust port on the head) that's the right temperature to read cruising that fast. Engine is working kinda hard, and you're running closed loop. So yeah it's gonna be hot.


I've heard some people say that you should worry about the turbo's health at 1600, valves and pistons can melt too.... I think higher than that is probably OK.

-Chris

david_rg79

"youre runnin lean when you run higher temps, meaning you are close to burnin a piston."

I'm sure glad you dont tune my cars

well seeing egt temp is an equation of timming i dont see how you relate egt temp to rich or lean...seeing i push my dialy driven pump gass car to 1800+ and my we push my buddy rich's dsm to 1900-2000f on pump gass i dont see how you came up with your statment....guess what our pistons arnt friend....and maybe thats why he pushed 489awdhp on pump gass...hmm

maybe if we dont understand whats really going on then we should go read Corkey Bell's book and get ourselfs and edu-ma-kation

cant wait to throw the turbo on our f22 parts car and show you boys how to make some power on a stock motor

david_rg79

btw 1450 is very good for crusing...means you are getting pretty good fuel econ..

i would get a wideband bro and monitor that also

CallMeJesus

ok, im gonna break this **** down for you david, cause you dont know ****.

when your car is runnin hot, it richens it up to bring the operatin temp down, or to prevent it from overheating. when you first start a car up, its runs lean, like 15.5-16:1, to both heat up and be more economical/smog correct.
what does fuel do besides burn? it cools down parts, such as valves, pistons, cylinders, fuel pumps; overall, the engine.

time for you to take an engine 101 class.

david_rg79

wow maybe you should go to EFI 101 class eh?

How many cars have you tuned before? and how many times have you tuned standalone systems?

I'm guessing probably none

sence you are an all knowing professional tuner i guess we all better listen to you...

your name "callmejesus" are you refering to the guy who steals hubcaps and sells them for $5 bux?

I guess i dont know **** becasue I havent been doing this for 6+ years, well guess what
Its not fuel that makes your egts change its your timming

and i guess all our cars that run between 1600-1800 are gonna blow up becasue we are running to lean....and Richs dsm must already be blown up

cant wait to hear your responce

22psicrx

my runs 1100- 1200 highway part throttle with my fjo at 13.9 at no boost. at 22 psi temps at 1500+ and a/f at 11.7-12 and ignition timing at 18 degrees if that helps. I believe the gas and timing cause high temps but giving it more fuel cools off the temp. But to much fuel then what happens. both need to be tuned. cant tune with just a etg definately need a wideband.
also why are they high. n/a cars run 1300 degrees or so. turbo cars more

david_rg79

although most people believe more gass cools the motor, it can also create detonation, when actually tuning a car there is a fine line to walk with timming and fuel isnt so important ( you need to stay within the safe limits 12.5:1 maxx under full boost) but giving to much fuel can create detonation

what egts are telling you is that when it starts to rise the ECU is pulling timming, thats it, NOT that you are rich or lean

22psicrx you should try and get your car to run 14.7(stoich) or higher while under cruise i like mid 16's my buddys supra runs in the 17's down the road(thats why he gets 35mpg+)

each car is diffrent in what it likes under cruise, just like under WOT
Umm your air/fuel ratios are fine and that is a good amount of timming for full boost, however some motors like timming and some do not, dsm's generally run very low(8-14) timming under boost where as most mr2's and celica all tracs like low to mid 20's under boost...on pump gass at 1.6bar we have the mr2 running 23 degrees of timming

may i ask what you are usuing to tune your car? hondata or standalone?

if you are running aem by chance do you wanna send me a cal so i can check it out for ya

david

SJcivic

keep it below 1550... above 1600 aluminum melts.

Rich

CivicSiRracer69

he is correct

david_rg79

Its a never ending battle.....how ignorant are you people?

1600 egt will not melt aluminum... maybe if you were to stick an alumium head into oven at 1600 it would melt...but egt is not a reading of how hot your pistons or cylenders or anything are...its just a reading of the temprature of the gass that has exited your head


Jeeze, people need not put in thier $.02 if they clearly have no clue on the subject at hand...This is the reason i stopped comming to this board....dumb *** people who think they are the **** and know everything because they have a huge *** wing a neons....I think that those people should be sent to Iraq

Jscivic how can you advise someone to keep and engine below a certain temprature when you clearly have no experiance with turning or probably turbos for that matter?

And for "CallMejesus" i would like to show you an AEM log where the air fuel ratio stays at 12.2:1 air fuel ratio across the board yet egts climb, but i doubt you would understand how to even look at the logg

david

LostSolVTEC

i'm runnin the stock JDM B16 with 10.4:1 comp and 10lbs on my SC34.

cruising at highway speeds is right around 13-14.5 on my E.G.T gauge. when i boost it hard on a 4th gear pull it'll push 16ish or a little more, if you're worried about the heat, go to a colder plug, every step colder will drop the temps about a 100ºF or so

i was tuned by Boosted-Hybrid (Jeff Evans) and he knows his ****. He told me the temps were fine

david_rg79

which person are you refering to as correct?

seen4ever

my car runs between 14.5-1500 degrees during cruising. i have my a/f right around 14.7.

EGTs and a/F rea really not that related. I've seen EGTs go down with the air/fuel at 17:1 just because you get the hottest burn at 14.7. when i get on my car, the EGTs normally drop to around 1300 and the AF varies around 11.8-12.5. I've been lazy and haven't ironed out the map yet.


Also when you start your car, it does not under any circumstances start out lean. the car is cold and the block is not up to temp yet, so its running much richer at startup than when up to temp. Once the car warms up the car goes leaner with the higher temps in the motor.

Chris F

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LostSolVTEC &raquo;</TD></TR><TR><TD CLASS="quote">you're worried about the heat, go to a colder plug, every step colder will drop the temps about a 100ºF or so
</TD></TR></TABLE>

Clarification, going to a colder plug will reduce the plug's temp by 100F, thereby not melting the plug. Turbo, cylinder, valves all still see the same temperature.

(1600 is still fine though!)

david_rg79

Colder plugs also help the battel aginst preignition, becasue they are more resistant to higer temps...glad to see some educated people comming in here now...unlike the tards who were piping up and had no idea WTF they were talking about (CallMeJesus)

CallMeJesus

david, how are people gonna believe you when you cant even spell words correctly? you look as though you failed out of high school and got a job at the local lube shop, and have worked your way up the grease monkey tree.

read a log? give me a ****** break. youve been doing this **** for 6 years...ive been doing this **** for nearly 9 years.
12.2:1 a/f ratio but yet egt's were still rising? hmm...detonation? or could it be that the a/f mixture was still burning while exiting the engine?
a safe a/f ratio would be 13:1 for boosted cars, and 13.5:1 for n/a cars. when you run richer than those numbers, the engine will become more likely to detonate.

SJcivic

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by david_rg79 &raquo;</TD></TR><TR><TD CLASS="quote">Its a never ending battle.....how ignorant are you people?

1600 egt will not melt aluminum... maybe if you were to stick an alumium head into oven at 1600 it would melt...but egt is not a reading of how hot your pistons or cylenders or anything are...its just a reading of the temprature of the gass that has exited your head


Jeeze, people need not put in thier $.02 if they clearly have no clue on the subject at hand...This is the reason i stopped comming to this board....dumb *** people who think they are the **** and know everything because they have a huge *** wing a neons....I think that those people should be sent to Iraq

Jscivic how can you advise someone to keep and engine below a certain temprature when you clearly have no experiance with turning or probably turbos for that matter?

And for "CallMejesus" i would like to show you an AEM log where the air fuel ratio stays at 12.2:1 air fuel ratio across the board yet egts climb, but i doubt you would understand how to even look at the logg

david
</TD></TR></TABLE>

An EGT of 1600 will melt aluminum . Correct that the EGT is only reading the gas temp passing by the probe, as you stated before. But what you are forgetting is the same fact that you just said.

Real Internal Comustion Temp does no equal the EGT reading. What I have grown to understand is that the combustion temp is about (give or take a bit) +200F from the EGT. 1600+200 = 1800F upon the aluminum. Dont think 1800F will melt aluminum? Weld and see what happens

Unless someone has some very deep pockets and has a honda, lets leave the internal combustion temp to a bit of guess-work by the EGT.

What do Neon's and Irag have anything to do with Hondeezies? (psssssttt, this is where you're losing credability).

You're not understanding turbos if you think that a correct A/F is all you need to keep EGT's within a certain area. This is the part of the convo. that can last for many many threads. Do a bit of research on the matter.

Rich

BACK TO TOPIC:
on the freeway (crusing) my EGT's are at about 1350-1450 depending on the conditions. I've hit 1500'ish once or twice, but that was dead summer heat uphill.