Since the 60# inj swap I have this lean spike at WOT shifts. I am SD so...

5600rpm/165kpa I go 8ish% lean
6000rpm/160kpa I go 5% lean

yeah yeah, add to those areas right. Well, I keep adding and it stays about 5% lean in the shifts. At the track on 5/6/2007 what I thought was a clogged meth nozzle, turns out wasn't.

My VE table is 135% at 6K/160kpa and 133% at 5600/165kpa
aaaaand the cells before that are 129% at 5600/160kpa and 121%(this should probably be higher, just have never hit it) at 5200/165kpa.

I mention these numbers cuz that's a huge difference, a large incline in the table at those cells. Those numbers are with me adding 5% this morning. I am guessing even with that 5% increase it won't fix it. It didn't help at the track a month ago.

Soooooo, my question is WTF? Mechanical? It holds the 160kpa and 165kpa spots pretty well, so it doesn't appear I was in belt slip and then not. (or crank slip for that matter) I wanna say a WB malfunction, but only at shifts?

 

this is very interesting. is this the scan you ran your 12.0 1/4? where you juicin' at the time of this lean spike? it happens with or without meth right? very strange...

 

I ran into this once when I started tunning, My v.e tabble looked like a nice hill with a huge hole in the top, I can't rember what I did, but I believe that is when I started playing with not relying on the p.e and b.e tabbles so much and tune more with the v.e....

I'll dig up some of my old tunes....

 

nope. this scan was this morning. No meth, no nitrous. It does this with meth and nitrous as well.

 

as you know, it's using the BE table.

 

Here is the 12.02 run...

 

the tables dont lie, but be sure to use real time...maybe 10% more in timing???may sound silly, but....

 

AND this motor should take 21-24 degrees advance at WOT

 

no way w/o meth could i get 24* out of it having the radix on there. It'll start tiny kr at 20*.

if the tables don't lie, then shouldn't it go lean in the 1/2 shift (pretty much same cells)?

 

Dropping fuel pressure deserves a look.