What are you all using for tuning your power adder cars?

I am planning to have each primary tube set up with a bung so I can find out which cylinders are the leanest and use an EGT (Exhaust Gauge Temp) in them.

Regarding the o2 sensors I want to run one on each side of the engine, however I am not sure where to locate them?

I was wanting to put them just before the turbos however I was told that that area is too hot for the sensor and I need to run it after the turbo... That will not work in my mind especially with an external wasetgate...

So where are your o2 sensors located???

 

By the way, I do plan to read the plugs as well....

 

I'm asking this on another forum. I have my own thoughts and opinions, but nothing to back it up. I'll post here anything I learn. It'll be good info when I get around to building the Turbo OHC six Pontiac engine.

 

Thanks, keep me posted!

I am reading that the o2 sensors are supposed to about 18" down from the turbos in the downpipe. This confuses me as it seems SO far away from the cylinders.

 

The oxygen content shouldn't change in that distance if it's a sealed system from exhaust port to there. And I'm "thinking" that the wastegate doesn't change anything unless it has a reversion issue, again the air content should be evenly distributed and bleeding some off shouldn't change the ratio of gases.

 

lots of cars have o2 right up by heads probably more of an issue if you did go way high on your egt and melted o2 then it would go into turbo and ruin it
just depends on your temps going in to turb
if your tuned properly and watch temps or have a light that would come on and warn you if high i would think before would be more accurate
dont you have a little distance from collector to inlet anyhow?
may not be that hot there

are you gonna have 10 different o2 gauges then
that would be sick have to video it to see it all without crashing but sick

 

This is what I am finding so far... Both these sources say to install the sensor down stream from the turbo.

http://www.innovatemotorsports.com/support/manual/LC-1_Manual.pdf

http://wbo2.com/lsu/lsuinstal.pdf

 

Do the OEM's install down stream of the turbo's? I think they do.

 

I know thhe Subu turbo cars have one before and one after the turbo. :spank:

More reasearch required I think...

 

I've got my opinions on it. I'm waiting for a response from some one I know that I'm fairly certain has done testing or at least has tuned cars with it set up either way and has a relavent opinion on it.

 

:3gears:

It looks like reading the plugs is the way to go to get things perfect, once I find out the leanest plug on each side I can tune to those ones without having to pull all 8...

The EGTs should be between 1400 and 1700 degrees before the turbos, and all of the AFR sensors I have found would be killed by those temps.

I will only run actual EGT gauge in the dash however I plan to have a switch so that the gauge will show one or the other at a time. Then if I want I could swap the EGT probes around to any of the 8 cylinder primaries. Both the EGT will also feed the computer data.

I have a computer to datalog all the info from RPMS, AFR, EGT, boost levels, etc so I can re-play the 1/4 mile run to see what happened. Then I can make changes to the fuel injection based on what happened and then try again. I am also adding a camera and mic so I can see/listen to the run as well as look at the data.

There will be gauges in the dash as well but like you say I will not be watching them while racing LOL...:3gears:

 

Just got back from the weekend.

We always have the O2 sensor just downline from the turbo.
You're correct about having a homogenous exhaust mixture after the turbos so it doesn't matter where the wastegates enter the exhaust system.
We had a problem when the O2 sensors where close to the end of the exhaust pipe. At low rpms the readings where not accurate.

Most of us use Racepak for data logging.
Record everything with the datalogger so you have it all in one file for quick review between rounds and for later.

Paul

 

Thanks!:TU:

 

Paul is probably the best source. All I got is install it down stream and an example on diesel's where the before turbo sensors averaged to the single after turbo sensor.

 

Just some added info but does not pertain to the O2 sensor.

When we add an exhaust pressure sensor before the turbos so we can monitor the balance between the turbos,
a coiled 3 foot steel brake line is used between the turbo manifold and the sensor to isolate the sensor from the heat.

Paul

 

And what do you do if one turbo is getting more pressure than the other one?

 

If all of the EGTs are within 75 degrees so we know the cylinders are running OK then we pull the wastegates.
First we use a regulated air supply to check for leaks, smooth operation (Not sticking).
Then we hook them together to the same air source to see if they open and close exactly at the same pressure.
If everything is good then we look at the exhaust pressure difference and shim the wastegate spring for the lower pressure side.
Any difference between turbos including the length of tubing and different bends on the way to the intercooler will cause an imbalance.
It's great if the plumbing for the turbos between each side is symetrical.

Paul

 

Very interesting!!!

 

I should have added that these are TiAL V60 wastegates, 2 port non adjustable so you either shim or change springs.

 

Cool, thanks for the info! I can not wait to make some boost!!!!:3gears: