Was doing a pull the other night to see how my tune was. First pull was in 2nd amd was rigjt were i like it. Did a 3rd gear pull and around 6800 to 7500 rpm the af goes lean. Its a 12:1 cr pro2 on e85 witj 450cc dsm injectors and a 255 fp
Any help would be nice

 

fuel pressure gauge?

try a 4th gear pull?

 

wideband?

 

Its a aem wideband ill try a 4th gear im going to try to add fuel there and see if it still does it

 

1. What ecu?
2. is it tuned, if so, what have you done to it recently?
3. Post the map
4. new?old?wideand?
5. what rpm does it do it?
6. Does it always do it? or is it random?if so, refer to question 6.
7. at what percent throttle? how lean?

Answer these questions and it will help us better help you.

 

Its a p28 with s300 i got the wideband from my buddy so its bout 2 years old but the o2 only has 1k miles on it. I tuned it 2 months ish ago my self. At wot it goes from 12.5:1 from 4k to about 6500. Vtec is at 5600. It also does it in 4th gear too. I dont have a way to check fuel pressure. And how do i post a map. Im guessing you want a fuel table map?? Im sorry if this is hard to understand

 

And so far its done it every time i do a 3rd gear or higher pull

 

try testing your WBO2 sensor... its pretty simple.

http://www.youtube.com/watch?v=1mb4VmDd0ao

 

so it goes 12.5 at wot? at what rpm does it go lean and how lean? Did you try adding fuel at that particular section? something could be clogged or so many other things. Sorry but you didnt answer all my questions i asked.

 

It goes lean around 6500 and it climbs all the way up to bout 16.5 before i let off

 

Really sounds like a fuel pressure issue to me.