Ok So I have checked for boost leaks and have no used to different WB to check my AFR. I just installed meth with an m10 nozzle. As soon as I hit peak torque my AFR is perfect at 11.9 but it starts dropping VERY FAST. No matter how lean I make my high octane map I still drop to about 10.7-10.5 by 7000rpm. My question is do you tink my nozzle is to big or what could be going on...

Cory

 

is lean spool disabled or enabled? if its enabled, maybe you could try disabling it and lean it out some more from there..

 

I have tried both

 

First, how did you "check" for boost leaks? Visual? Or with a boost leak tester? Is the meth kit wired and grounded correctly? Mine messed up the readings I was getting on my UEGO gauge because of these 2 reasons I listed above. At what Mod point did all this stuff start happening?

 

Oh, your messing with the maps. That could be it, and I have NO CLUE on that one, but I know you have to "take out" fuel that your replacing with meth, or something. You do that? Give Mellon a call, because his "Mellon" is huge, and full of all the knowledge and answers for this type issue. Good luck bro!

 

I did do a boost leak and fixed everything... started when I added the meth

 

Did you install the meth and tune it or are you just spraying it with no other changes to your previous tune ?

Not sure on if you have tryied to lean it out on your maps ?

 

That's when mine messed up too. I can't remember what I did to fix it, but I started a thread on it a few years ago. I will look for it, or you can. I will research, but I had same issue, and fixed it. Was spliced in same wire as my gauge? Or had something to do with the 3 BAR Map sensor. Sorry, I'm not much help right now. I'll get me a coffee and be back to look. (Easy fix though)

 

I have tried leaning it out A LOT

 

OK so i'm going to put the stock injectors back in and see if that's it... right now i'm running 52% injectors and I dont think they can go any lower .... anyone want some PTE 780's

 

when tuning 100% meth and have a big nozzle it can take quite a bit of leaning out to get the correct a/f. The ting with that is, you need to have a good failsafe. You are going to be taking out alot of fuel so if for whatever reason meth stops flowing and you have taken out fuel from 10.7 to get to 11.4 or so at redline, you could go from 11.4 to 15:1af in a split second to boom pow surprise.

Also for a stock setup non e85 you don't need to upgrade injectors.

 

I understand that... I had the bigger injectors because I had a FP green.. now that I'm back to stock I am going to go back to the stock 550's