The "Device" is here !!

[1sty]

I talked to keith 75 is high for 6 PSI, if I remeber correctly. I hope 80 is fine becuase my fuel pump can't go over that. Since I Have never detected knock at 80 PSI of fuel I think I am ok.

What do you have to do to install the A/F guage?

Where does it go and can anyone install it or is welding involved?

I only have room for one more guage I think its going to be an electronic fuel pressure guage.

We are trying to run 12:1 rihgt?

 

[LinuxRacr]

It is easy. I have pics of the wire I tapped on the 1st 02 sensor wiring harness. Do a search, and if you have trouble, hit me up.

 

[big_ben]

Dont use an autometer air/fuel gauge. That thing is just a decoration with a light display. It is basically worthless. Use a pyrometer(exhaust gas temp gauge). It is much more accurate. The autometer air/fuel ratio is very inaccurate, and it isn't anywhere close until the O2 sensors come up to the correct temp.

 

[LinuxRacr]

Dont use an autometer air/fuel gauge. That thing is just a decoration with a light display. It is basically worthless. Use a pyrometer(exhaust gas temp gauge). It is much more accurate. The autometer air/fuel ratio is very inaccurate, and it isn't anywhere close until the O2 sensors come up to the correct temp.

I agree! The readings are not even consitstent until the 02 sensor temps are up to par.

 

[big_ben]

Hey Patrick, I like your new avitar. Do you like my new signature? Those are just some of my bitches! (rofl)

 

[LinuxRacr]

Hey Patrick, I like your new avitar. Do you like my new signature? Those are just some of my bitches! (rofl)

Oh yeah! Send my invite immediatly!!

 

[Keith@FP]

Factory O2 sensors are really only accurate around stoich - ie, 1.47:1 - and at normally aspirated temperatures. Give it the exhaust stream from a turbocharger that's running 12:1, and it's not accurate at all. That's why we used a wideband O2 sensor to test and tune our car.

The stock sensor in the Proteg is a 4-wire sensor I believe, which is heated to provide accurate readings right away.

EGT gauges are a good way to go, but they do require you to drill and tap a hole in the manifold. Don't do it with the manifold installed unless you really want the shavings to go through your turbo. FM has a wide range of gauges on the shelf.

Keith

 

[spoolinmp3]

Another consideration with egt gauge probe (if you already have your system installed) is to mount it in the downpipe. This is not the optimal location. Just remember that your temps will be about 175-200 degree cooler vs mounting the probe in the runner of the leanest cylinder. However it is recommended that you mount your probe in the leanest cylinder, this will keep tabs on the cylinder that is under most strain.

As far as EGT gauge brands. We have noticed that the autometer gauges are more lazy than the HKS and Greddy brands. These brands are much more responsive, which is a good plus for an EGT gauge and are in the same price range.

The setup I utilize on my car has a memory peak hold function. This enables you to drive WOT thru your gears and then pressing a button on the gauge will reveal your highest egt temp. This is much safer than watching all of your gauges and watching the road at the same time while you are attaining mach 1 speeds

 

[smp3000]

Question for you on the EGT probe.... I have my guage installed but have not done the tap for the prob yet. One night while owrking on some junk I attached the probe and forgot to unattach it before I closed the hood. So for about a week I was driving around with the probe flying all over the place and at one point it was dragging on the road!!!!!

The probe doesn't seem to be in TOO bad of condition but does have it's scrape marks. Is this going to cause malfunction in it's readings?

 

[1sty]

Another consideration with egt gauge probe (if you already have your system installed) is to mount it in the downpipe. This is not the optimal location. Just remember that your temps will be about 175-200 degree cooler vs mounting the probe in the runner of the leanest cylinder. However it is recommended that you mount your probe in the leanest cylinder, this will keep tabs on the cylinder that is under most strain.

As far as EGT gauge brands. We have noticed that the autometer gauges are more lazy than the HKS and Greddy brands. These brands are much more responsive, which is a good plus for an EGT gauge and are in the same price range.

The setup I utilize on my car has a memory peak hold function. This enables you to drive WOT thru your gears and then pressing a button on the gauge will reveal your highest egt temp. This is much safer than watching all of your gauges and watching the road at the same time while you are attaining mach 1 speeds

When you say in the leanest cylinder, do you mean in the manifold in front of the output from the leaqnest cylinder or are you saying we have to tap the engine itself?

 

[spoolinmp3]

The probe doesn't seem to be in TOO bad of condition but does have it's scrape marks. Is this going to cause malfunction in it's readings?

From the looks of it, looks like you will be needing a new probe. They are generally sensitive to dragging on the road

 

[spoolinmp3]

When you say in the leanest cylinder, do you mean in the manifold in front of the output from the leaqnest cylinder or are you saying we have to tap the engine itself?

I mean the runner infront of the leanest cylinder. Not the engine itself.

However there are 2 schools of thought regarding egt probe placement. One camp thinks that the egt should be placed in the downpipe. Many capable tunning houses such as petter farrel supercars and others mount there probes in the downpipe. The other camp such as most miata folk mount there egt probes in the leanest runner. I prefer the leanest runner myself but if you decide to mount it in the downpipe just remember that your temps will be about 200 degrees cooler and you will have to compensate for that.

 

[1sty]

What the hell is a runner before a cylinder.

 

[Keith@FP]

Each of the "legs" of a manifold is a runner. It's the individual path for each cylinder before they join together.

Exhaust manifolds have no runners before the cylinder - that would be the intake manifold.

Keith

 

[1sty]

Exactly why I am completely confused at why someone would use a EGT in a runner, BEFORE a cylinder, I wouldn't think it would be very effective.

I assume he ment in the exhuast manifold runner AFTER the cylinder.

 

[Keith@FP]

Well, if you're standing in front of the car, the exhaust manifold IS at the front of the engine

Anyhow, I think we all know what is meant...

Keith

 

[1sty]

Well, if you're standing in front of the car, the exhaust manifold IS at the front of the engine

Anyhow, I think we all know what is meant...

Keith

Actualy that was the problem, I didn't.
thanks for clearing it up

How easy would the BEGI manifold be to tap out and tread for an EGT and would it be able to stand the test of time as well if it was tapped?

How do you find out what the leanest running cylinder is?

 

[Keith@FP]

You find out which is the leanest running cylinder by using 4 EGT gauges. No kidding. On your car, I'd recommend putting the probe just before the turbo in the middle of the collection area. The manifold is easy to drill and tap, and this will not affect the lifespan. We have probes on most of our cars, including the racer.

Not a Protege manifold, but the location is similar:
Drilled manifold
Again with the drilled manifold, sensor installed

Keith

 

[spoolinmp3]

Exactly why I am completely confused at why someone would use a EGT in a runner, BEFORE a cylinder, I wouldn't think it would be very effective

Sorry Brain fart

We determined the hottest runner to be the last cylinder (the last one on the left hand side if you are standing in front of the engine bay). However we have some new findings showing that its the 3rd runner next to the last one. We will be doing some more research on this to determine the leanest cylinder.

You can see a pic here of the probe mounted on our mani's Its on the extreme left runner.

 

[saided18]

Keith,

just wondering. could that be a option in the turbo kit??? having the EGT probe installed in the mainifold at FM. how about it???