Hello Honda Tech. I need some serious help. I am using crome pro to tune my car and for some reason my car goes lean in high rpms. I am using a AEM uego wideband and its basically brand new. I first thought that the car was going lean because i had a pinch in my fuel line, i fixed that and also changed the fuel filter along with it, car still goes lean in high rpms. The fuel pump is brand new. I had a walbro 255lph fuel pump and i thought that was going bad so i replaced it with another. I then thought the only other thing that could of gone bad was the injectors. I had 440 cc precision injectors and i borrowed a set of rc 310 injectors to test out. We re did the map and got it to idle right and tuned low cam, when i got on it the wide band shot to lean at around 4800 rpms. I checked the voltage to the fuel pump and the readings stay constant

My set up is gsr block, jdm p30 pistons, shot peened ls rods, ls crank, oem bearings.
gsr head slightly ported intake side crower stage 2 cams, rc310 injectors/precision440 injectors, skunk2 intake manifold, BLOX 68mm throttle body hytech replica header, AEM fuel pressure regulator.

I am not sure if my map got messed up somewhere so i am going to try out another map that is known to work and tune from there. If anyone has any idea on why this might be happening please leave your .02. And if you have a similar basemap that i can use for this set up, it will be greatly appreciated.


Here are some pictures. first pic is right before it starts to get lean. second pic is where it starts to get lean. and 3rd pic is when it gets so lean my wideband doesnt even read it anymore.

 

anyone out there?

 

add more fuel?

And are you really doing your pulls in 1st gear? And you're going 19mph at 4700, 4900 and 5100 RPM?

 

no im not, i just did my pulls in first cause i wanted to see if they went lean or not. i do all my pulls in 3rd when tuning.

 

its going to go lean in first because of spinning. try a higher gear. 4th is more of a 1:1 gear

 

1. Try another wideband sensor
2. Monitor your fuel pressure to ensure it's not dropping (You need an internal gauge or a dyno to do this)

 

1. Try another wideband sensor
2. Monitor your fuel pressure to ensure it's not dropping (You need an internal gauge or a dyno to do this)

 

Heres a little update, i rebuilt the motor(new rings and new valve seals). i am using a new chipped ECU, swapped injectors, new banjo bolts, new fuel pump, new fuel filter, new fuel pressure regulator, i checked the fuel pressure with a gauge and when my wideband read lean in high rpms, the fuel pressure was fine. any ideas? something electrical?

 

You posted screen shots of your low-cam fuel, but what does your high-cam fuel look like?

 

x2 Post graphs of your high cam. You should of went with the Lc-1 Wideband from Innovate.

 

I am having the same issue! My setup is D16Z6, rc550's, 50trim @ 13psi, tuning with Crome Gold. Goes lean from 5k rpms and up no matter how much fuel I add in the map. I have replaced fuel filter twice, watched fuel pressure and voltage as well. I have been messing with it all day today actually trying to figure this out. I replaced the fpr as well, new vac lines everywhere. It's just annoying as hell. I maxed out the cells in those areas and it makes no difference, but everything under that rpm will richen up like crazy if i change the fuel. I have full control until 5K and up. After 6k rpms forget about it.

I can post my map if needed.


edit: I am using a plx-m300 wideband about 6" away from turbo in the downpipe as I do with every car. Very responsive

 

Really really dumb question but should be asked.

For the high RPM lean conditions, are you tuning on the high cam fuel table or the low cam fuel table?

 

I've done both. I always turn vtec off and tune the low cam table all the way through first. Never had an issue before. Then I switch vtec back on and tune the high cam. I've tried both ways and still go lean up top. :/

 

ALLLLLLLLLLLLLLLLLLLLLRIGHTY THEN! I found my issue GOD I feel like an idiot... so at what point I made this mistake I have no idea, but in Gold under advanced fuel corrections under 284deg iat's I put -70 instead of -7!!!!!!! By the time I got out on the highway and started tuning the iat's were coming up and NO they were not getting over to 200degrees but it was pulling from the 154 cell which is related to the next one OMFG. I put it to -7 and I had to pull so much fuel YESSSSSSSSSSSS!

So embarrassing as I've tuned many cars, but it was such a simple mistake I never looked for it. I just happened to see it while browsing the map today.

I can't fuggin believe it.

Anyways I'm sure that's not the issue of the OP, but one thing you can learn is to LOOK AT EVERYTHING in the map!!!!!!!

 

...check duty cycle. If you're peaking, obviously nothing you do to the ROM will give you any more fuel.
And check your wideband voltage/AFR chart. If you don't have the 0-5v conversion, be sure you're calibrated for 0-3.8v.