Gems controller and AFR numbers explained?

[ApexGTman]

'15 RTX LE with MPI trail turbo. I finally know my afr numbers but I am wondering how the numbers are affected by the gems controller. I know there are 5 different numbers for the GEMs setttings but I have no idea what each number represents.

Last year before I had my gauges installed and was doing some drag racing I noticed that my viper would back fire when I got hard on the throttle. Now that I have my gauges installed I notice the the AFR numbers drop into the 9's if not into the 8's at the 6600 - 7200 RPM range. would this be considered rich and could it cause it to back fire at times?

I also noticed at WOT AFR drops from 11's and 12's to 9's and low 10's.

If I knew what each color represents I may be able to make some minor adjustments now that I actually know my AFR numbers.

Any info or ideas will be greatly appreciated.

 

[staggs65]

You can download the gems instructions on MPI s site

 

[Studroes144]

http://viper.mountainperformance.com/GEMS-Controller_ep_48.html

 

[Byam]

If i put the mode #5 at 2.5 like they recomand and i am cruising at 7000rpm ,afr are in the low 10 even in the 9!
Lets be honnest the defaul setting is totally wrong for sea level!
I am not gona recomand anything to nobody for the gems.......
I can t make it work good enough!

I had 9000km on the sled and it never work how its supposed to... Always a lot of backfire headers is good ,red permatex everywhere to prevent any air leak..... To lean ,to rich....

Guys who ride at sea level whit mpi trail kit. Can you post your gems setup the 5 mode please???

 

[Joe ltx-le]

Ok. I'm at sea level. I used the exact same setup as the mpi websit recommends other then 2 settings.

First the green setting idle- I leaned that out so the green light was on 1. Not blinking, solid.

Second the cruise setting. I leaned it out also. The red/blue setting. Went from 3.5 to 5Remember the cruise setting is backward from the other 4 settings. Higher the number the leaner it is.

 

[Byam]

So your mode #5 is still at 2.5???? If i ride it a this number the sled make "" fireworks"
mode 1-1
2-3
3-3,5
4-5
5-6
I already bust 2 exhaust the third one is on its way to break soon.......

MPI said its too lean and i overheat the exhaust......!!!!!!!!

 

[Joe ltx-le]

So your mode #5 is still at 2.5???? If i ride it a this number the sled make "" fireworks"
mode 1-1
2-3
3-3,5
4-5
5-6
I already bust 2 exhaust the third one is on its way to break soon.......

MPI said its too lean and i overheat the exhaust......!!!!!!!!

My 5 mode is at 5 setting. But if your looking for richer you need to be at below 5. 1 is rich 10 is lean only with mode 5 the cruise mode. . What is your cruising afr numbers? I'm running around 11 afr cruising with the number 5 mode being set to 5.

Wow confusing on a message.

 

[Joe ltx-le]

We are below 3000 feet. If I was you I would set yours up exactly like they say to. Other then the idle maybe. And then go from there

 

[yamahabuyer]

I'm at about 1000 ft and I run their recommended setting except I leaned the idle setting some

 

[Dinner]

I'm generally around 800 ft above sea level. Settings I currently run after breaking in, getting some miles on the sled;

Green - 3
Yellow - 4
Green/Blue - 4
Red - 3

Red/Blue I don't remember.

 

[ApexGTman]

Green - 4
Yellow - 4
Red - 3
Blue/Green - 5
Blue/Red - 3.5

Running at sea level. 9's and 10's at 7000 RPM cruise, Same for WOT. Backfires sometimes when I get hard on the Throttle from stop like in a Drag race.

 

[Joe ltx-le]

Green - 4
Yellow - 4
Red - 3
Blue/Green - 5
Blue/Red - 3.5

Running at sea level. 9's and 10's at 7000 RPM cruise, Same for WOT. Backfires sometimes when I get hard on the Throttle from stop like in a Drag race.

Rich for surr

 

[Joe ltx-le]

I leaned out the cruise setting and it made a big difference in both fuel mileage and afr numbers

 

[ApexGTman]

I leaned out the cruise setting and it made a big difference in both fuel mileage and afr numbers

Hey Joe, What is all 5 of your numbers?

 

[WVTurboLTX]

Mine was crazy rich all the time till I made similar changes to what is mentioned above. I'm still having issues pulling proper rpm. I'm thinking the quiet muffler is causing a restriction on the system, making the thing run rich and robbing me of HP. It's a good bit faster than my friends stock xtx but doesn't seem anywhere near 170+ HP. I'm guessing around 155ish.