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Old 10-18-2000, 10:30 AM   #1
rjones
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Post AF vs. EGT

I've seen losts of posts on both, but could never get a straight answer. Is and EGT gauage really preferrable for mixture tuning in an computerized, injected car? Or is the O2 sensor all you really need to do the trick?
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Old 10-18-2000, 03:58 PM   #2
adam99rs
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Best combo IMHO (assuming stand alone ecu, not the stock one with piggybacks) is to go with a good EGT guage, and something to moniter O2 voltage (i forget what the DSM guys use...I hav one on my GVR4, but the name escapes me.....SteveS has it in his Turbo RS....).

For using the stock ecu, again, a good EGT guage (HKS, GReddy, APex'I, Omori), and an Apex SAFC is a good choice.

I hav sued mahy different A/F guages (Cyberdyne, Field, etc.), and while they technically work, they are only as accurate as the amount of LED bars they have 9whoich is not many). The more bars they have, the more accurtae they are. The looks of these A/F guages is also questionable (really up to the individual though). But, I guess the same can be said for the SAFc...i have it, and never leave it in the "up" position wher I can read it...I hate how it looks (though it is functional)
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Old 10-19-2000, 12:26 AM   #3
Impy
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Ok so how do we tune with the EGT?? do we just look for the lowest readings we can get??
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Old 10-19-2000, 01:03 AM   #4
Sean McElderry
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Post


You need both to do it correctly. If I *had* to pick one, I think I would take EGT.

Sean
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Old 10-19-2000, 01:06 AM   #5
Chuck
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Agreed.
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Old 10-19-2000, 10:37 AM   #6
adam99rs
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Ahhh...that's the art of tuning! do a search, as EGT's of most, if not all us turbo guys have been discussed before. i did what SteveS did, and tuned on accordance with the DSM crowd.....I was obviously never let down.
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Old 10-19-2000, 12:20 PM   #7
WRC 555
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Is an EGT gauge necessary for a N/A car?
I fugure if you go turbo then it is very important but let say you just wanna put some nice gauges in a N/A car.
I know oil temp or oil pressure and water temp would be good, but is EGT necessary?
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Old 10-19-2000, 02:18 PM   #8
RidinLow
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Yeah, I have noticed that... I coasted down a hill in 5th for quite a while & the EGT gauge went all the way down to its lowest reading (600). My question is how come the exhaust still makes so much noise if the motor's not combusting?
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Old 10-19-2000, 03:20 PM   #9
SteveS
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I'm using the Jumptronix A/F gauge by Alex Anastousia (I know I butchered his last name!). The great thing about this gauge is that is gives the exact voltage reading from the oxygen sensor; it doesn't use LEDs. There's a huge difference between 0.82V and 0.88V, IMO.

I've finally gotten around to installing a great EGT setup. I'm using the Autometer Phantom series EGT gauge. BUT I'm using a fast-reacting type-K thermocouple probe from Westach (which is really markets to the aviation market). This combination reacts VERY quickly, which is something I really had a problem with using the VDO setup. I can literally watch the EGT's change as I modify throttle position, etc. Pretty cool.

Anyhow, as Adam already stated, go read up around DSM.org for information about acceptable EGT and A/F readings. If your car is tuned to a reasonable state, you should see EGT's at say around 1550F when romping on the car. Personally I've tried to keep mine to 1500F, which is probably keeping me from eeking out that last piece of performance, but it makes me feel safer.
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Old 10-19-2000, 10:04 PM   #10
ImprezaRS dot com
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I have the autometer phantom EGT gauge and don't know about the type of thermocouple, but it too is very fast reacting.

I am thinking about adding a second thermocouple in another location, with a switch to go between the two. What is the BEST location for the thermocouple to see these 1,400 - 1,550 EGT's that you mention?

Larry www.ImprezaRS.com
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Old 10-19-2000, 10:10 PM   #11
RidinLow
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Larry,

On the header as close to one of the exhaust ports as possible.

SteveS,

Where do you get these thermocouples? Will they work with my Autometer ProComp Ultralite EGT gauge (no gauge sender unit, just hooks directly to the thermocouple)? The problem I'm having in tuning is that it takes a few seconds to hit a peak temp.

[This message has been edited by RidinLow (edited October 19, 2000).]
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Old 10-20-2000, 01:32 AM   #12
Chuck
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You can determine how rich or lean you are running based on the temp of the exhaust gasses. It has been said that the RS is very comfortable at 1400 degrees under load. This is the temp you want to shoot for. Making adjustments to your fuel ratio will be seen in the EGT's. Try it out, it's kinda fun. Rich=cool, lean=hot. You don't want to lean out too much because extreme heat and aluminum heads don't mix. And you don't want to run too rich because you'll kill your cat and you may just blow up your engine over a period of time like I did. Oops. Anywho... this gauge has become invaluable in tuning.

It's cool to see how your engine turns into an air pump while engine braking... no combustion, just cool air flowing thru your engine.
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