I just got a flash in my car along with some supporting mods and it all seems great! I put some new plugs in just to see and when i pulled one out it seemed really white! im only running 21-22 psi of boost and thats always on 93 octane! is something wrong with the flash or should i be running colder plugs? I also did put a walbro fuel pump in so i know that shouldnt be the problem!

 

You need a wideband o2 sensor to be sure. you can go to a local dyno facility and measure it there.

Or you can order one of the numerous models available for $350-500 if you think you're going to do any tuning yourself or if you are a hypochondriac and need to check it all the time.

 

Or you can just come in for a custom tune on the dyno at Pruven and avoid speculation !

 

i know i should have a wideband but is their any other way to tell until then? just so i can drive it? I also have evo scan can i use that?

 

A few comments:

1. You need a wideband device with the sensor installed at the end of the downpipe to get an accurate reading of your AFR. The wideband on the dyno reads the AFR from the tailpipe and reads leaner than it should. On my car it was 0.3-0.4 of a point leaner.

2. It is always a good idea to run one step colder plugs on your Evo after you mod it. BPR8ES are a good choice. Gap them to 0.024-0.026 and your good to go.

3. The 21-22 psi that you are reading from your autometer gauge is more than likely inaccurate. It is probably off by 1 psi.

4. You can read the narrow band O2 voltage on your Evo with Evoscan to get an IDEA of what your AFRs are like, but I read that the Evoscan readings of that parameter are inaccurate. Do not use the narrow band voltage to tune your AFR, it is not accurate.

 

Was the flash for your mods or did you get flashed and then add a bunch of parts?

Either way I really don't see anything in your mod list that should be dangerous. The exhaust stuff has minimal impact and if your worried about the boost level making you lean just turn it down until you can get on a dyno to verify it is safe.

 

i had all the mods before the flash! good idea with the plugs though! i dont even know if it is lean i just know what a good burn looks like on a plug and these look lean to me....

 

Yea white is probably a little lean. I believe you want them light brown colored.

This link has a bunch of pics...
http://www.theultralightplace.com/sparkplugs.htm

or

http://www.gnttype.org/techarea/engine/plugs.html

 

Had a car on the dyno today with a HFC. PLX wideband in the DP was spot on with the Mustang wideband in the tailpipe.

Some times things are not always text book.

 

You are right. I should have specified that this was on a dynojet wideband. The Mustang dyno uses an Innovate wideband (I was surprised when I found that one out) and from what you say gives more accurate readings at the tailpipe. Thanks for the info.

Did you get a chance to log timing at the OBD2 port and compare it to timing logged with ECU+?

 

Unfortunatly I ran out of time. I did my first "safer then stock" tune on the car so it took a little longer then other cars do to get just right. I'm still not 100% happy with it but I will be working with him a little more to get it right.

Evo's don't like burning fuel correctly at 10.7 AFR and 14 degrees of timing advance up top.