Greddy A/F Wideband help

[chdesign]

Yeah break in the sensor or it will mess with your head....i installed mine last weekend....although its coming out to go into the Colt Turbo rally car ...as for wiring the heater wires together yes you can do it but it will still throw a CEL as the extra resistance from being spliced will make the voltage too low and throw a CEL too I've already tried this. Your best bet is this....what I did was left the stock O2 sensor plugged in cut the signal wire adn spliced that one with my O2 sim it works fine no CEL you may want to try that. And yes the gauge is very accurate to 11:1 on the rich sid eas Terry said.....if you break in teh gauge a little more than suggested this reading will level out more.....make sure you set the correct setup level also you turbo guys it shoudl be set at the 11:1 setup calibration for me its at the 15:1 calibration cause my O2 sensor as it sits is way the hell down the exhaust lol

 

[I-Am-Chris]

you can always use an extra bung like a wideband right? thats what i've been told. Hey terry What wideband do u use? I use an FJO one. Does yours read below 10.0 cause the FJO wont. BTW alot of widebands use 92-95 Civic VX o2 sensors.

 

[spoolinmp3]

you can always use an extra bung like a wideband right? thats what i've been told. Hey terry What wideband do u use? I use an FJO one. Does yours read below 10.0 cause the FJO wont. BTW alot of widebands use 92-95 Civic VX o2 sensors.

I use a Uego wideband. Widebands operating monitoring range is 10.0 to 19.0
But thats all you will need. Yeah the tech edge utilizes the civic wideband.....kinda funny a vx uses a wideband

 

[igdrasil]

hmmmm

I think I will have my downpipe full of probes (Stock O2 sensor, greddy A/F, 2nd O2 sensor and EGT)

All of em in the downpipe, is this safe?

Any suggestions?

 

[perfworks]

igdrasil, well after talking to several people at greddy they say this seem to happen alot. the unit was meant only as a supliment to the o2 sensor in some vehicles with OBDI and some newer models but unfortunatly not a replacement for the stock O2 like the directions say.
they also said that the manual that came with it has not been updated and is only good in the euro market and some Japanese-spec vehicles in the us.
he DOESNT advise splicing in the factory harness because some others have tried and not only does it not take care of the problem but it may harm the module.
at this point you have to use it seperatly.
sorry i couldnt help you any more.
it is a good unit though and can be benificial for lean readings to keep you out of trouble. good luck man

 

[perfworks]

hmmmm

I think I will have my downpipe full of probes (Stock O2 sensor, greddy A/F, 2nd O2 sensor and EGT)

All of em in the downpipe, is this safe?

Any suggestions?

your egt should be on the manifold
your stock O2 you should really try to keep in the manifold too.
the graddy in the downpipe and the second O2 AFTER the second cat.

 

[igdrasil]

Thanx to all

I will not qote everyone, so:

Spoolin,
thanks for the advise on how to read the greddy unit, basically, i will not be sure if im running very rich, but i will know if im running lean, and that is ok. Like you said, this unit and the EGT will make a good combo.

Perfworks,
as always, thanks for all your help I will follow all your suggestions. SOmehow I knew It could dammage the unit by splicing the wires, so i will be running both sensors. About the position of probes.... Now Im afraid of making holes in the manifold. I think its pretty

chdesign,
I dont know if the break in I did was good enough, but, the needle is not that jumpy, It only jumps when partial throttle like every second on his redline, and when i let off the gas it will go to 16:1 fast (of course) and when the engine reaches idle, it jumps to 13:1 and resume in 14.6.
On heavy loads, or when the open loop comes on, the needle moves slow between 14 and 12, that will depend on your foot.

 

[spoolinmp3]

Holy sh$$
I did not read the first page but you are utilizing the stock o2 on the greddy gauge? You should not do that. and place the the greddy o2 in the downpipe close to the turbine exit as possible. Having 3 sensors in your DP is not a problem

 

[igdrasil]

Holy sh$$
I did not read the first page but you are utilizing the stock o2 on the greddy gauge? You should not do that. and place the the greddy o2 in the downpipe close to the turbine exit as possible. Having 3 sensors in your DP is not a problem

Nope, Im using the greddy sensor, the stock sensor is @ home.

Now with the turbo I think im going to tap 2 holes in the manifold for the stock O2 sensor and the EGT, by the way, does that voids my warranty?

I am thinking on tapping the EGT in the 4th runner as you recomended, but that will leave the other 3 unmonitored...what if the 1-3 cylinders are failing and not the 4th?
I still need to see the manifold for a good place to put them.

 

[spoolinmp3]

Per our experimentation the 4th runner runs the hottest thus leanest. So this would be theoreticly the first to go.
The o2 sensor however should NOT go into the manifold, that must go into the downpipe

 

[perfworks]

Per our experimentation the 4th runner runs the hottest thus leanest. So this would be theoreticly the first to go.
The o2 sensor however should NOT go into the manifold, that must go into the downpipe

terry,
im not rying to be a d*k, but why dont you explain WHY it should not go into the manifold.
(nevermind it is contrary to what i have posted.)
now another , why would you mount it only on the one cylinder (EGT probe). your trying to control all the cylinder temps not just
but just for kicks i will agree with your assumption that its placement in the 4rth pipe is hotter.
but the O2 can be mounted before the turbo. not to say it will not function properly.any way igdrasil mount it where you have the room. from the looks of the manifold from spoolin' i dont know where you could mount it to get a good reading and without one of the runners cracking in time.

 

[spoolinmp3]

im not rying to be a d*k, but why dont you explain WHY it should not go into the manifold.

Not a problem, First we will not warranty any manifolds if you mount that huge 02 sensor in it. Second after speaking with a greddy rep they stated that the optimal location for placing the 02 sensor would be in the downpipe an inch away from the turbine exit just like you would mount a wideband 02 sensor. Third if the 02 sensor provided see's more than 800c then it will greatly shorten the life. Fourth on igdrasil setup he is utilizing both an egt and greddy a/f. The egt will monitor the leanest cylinder while the a/f will give a good rounded a/f reading of all 4 cylinders

 

[perfworks]

Not a problem, First we will not warranty any manifolds if you mount that huge 02 sensor in it. Second after speaking with a greddy rep they stated that the optimal location for placing the 02 sensor would be in the downpipe an inch away from the turbine exit just like you would mount a wideband 02 sensor. Third if the 02 sensor provided see's more than 800c then it will greatly shorten the life. Fourth on igdrasil setup he is utilizing both an egt and greddy a/f. The egt will monitor the leanest cylinder while the a/f will give a good rounded a/f reading of all 4 cylinders

well you cant warranty that kind of manifold ill agree because IT WILL crack like i stated above.
#2 the greddy rep does not deal with mazda ecu's that often so the dont understand the need for it. mounting it on the downpipe is a fix thats easy but will never take care of the CEL problemunless you mount the cat after the turbo as close to the position of the stock cat and then another to maintain efficiaency
#3 if you are going anywhere NEAR 800c then obviously you have a bigger problem .you should never be anywhere close to that range terry if you are properly tuned in ignition and especially fuel enrichment.
you know this!
#4 the egt was (again ill say ) meant to monitor ALL the exhaust gas entering the turbine as an average to the 4 cylinders.
its reading should be used only as a referance to help tune the vehicle. by mounting it on one cylinder you are almost "limiting " its credibility.
#5 again the greddy unit should only be used as a referance too because it is not as accurate as an NGK or BOSCH wideband O2 and module.
i have by the way stated that the greddy should be placed in the downpipe right after the turbo. but because of the structural design of your manifold i also would not recomend mounting the stock O2 in the manifold because youll end up repairing it very often.if on the other hand we were dealing with a FM manifold then there would not be any problems.

 

[spoolinmp3]

#3 if you are going anywhere NEAR 800c then obviously you have a bigger problem .you should never be anywhere close to that range terry if you are properly tuned in ignition and especially fuel enrichment.

Well thats not 100% accurate because our cars do run in the high 700c range and this would accelerate the wear on the sensor over time.

#4 the egt was (again ill say ) meant to monitor ALL the exhaust gas entering the turbine as an average to the 4 cylinders.

You cannot say this since this is a VERY widley debated topic. If you search in past threads about egt placement. There are 2 camps one stating that the egt should be mounted on the leanest runner and the other stating that it should be mounted in the collector. Most miata folk agree that the egt placement should be placed in the leanest runner. Other groups, forexample like the supra community like to mount there egt's in the DP. It is the genereal consensus that most 4cyl motorheads mount there probes in the leanest runner. Is one way correct? No just to different ways of doing something. So I dont think that its appropriate to say that your theory of mounting is the absolute correct way. When it is obvioulsy is very highly debated by many tuner shops and nowledgeable turbo people.

#5 again the greddy unit should only be used as a referance too because it is not as accurate as an NGK or BOSCH wideband O2 and module.

That has nothing to do with it. I was not mentioning how accurate the sensor was but how sensitive it is. And they dont like to see temps of around 800c for a consistent time just like a wideband. Thats why I said this

if on the other hand we were dealing with a FM manifold then there would not be any problems.

Agreed, I do have confidence that the sensor mounted on the mani would not cause any cracking since cast iron weld bends are very strong and very similar to FM's construction. However this has never been tested and we are not willing to provide a warranty on somethng that is not tested

 

[igdrasil]

Tehn I will mount everything in the downpipe, I think I will have good readings, maybe not the best, but good enough for tunning and safety.

I just dont wanna void the warranty of the mani if there are other places to put the EGT. I will use the closest place to the turbine in the downpipe to put the EGT (the one spool provided).

 

[spoolinmp3]

igdrasil actually I would mount the egt probe in the manifold. Preferably on the runner if you can and do not tap on any of the welds.

 

[igdrasil]

not on topic but...

WHOAHH

A local turbo setup here in PR, mp5t from creative performance is doing 13.3@104mph at the 1/4mile track

13.3@104mph

Im going to meet this people soon

 

[perfworks]

nice numbers. get some tranny and axle info while your there

 

[PaulMP3]

tell them to come to the forum and share the knowledge,