rbeharry

sorry for leaving the discussion. I was starting to get a rough, fluxuating idle after a while. I started driving the car like a granny because i was afraid of it leaning out. It started running leaner at lower rpm until one day, i got pissed off and abused it. I fed every gear to redline, power shifted the sh*t out of it, and it ran like a champ. It DID NOT go lean once and the A/F ratio was fine after it at idle. So i dont know if this is a faulty dyno wideband or what. I have never experienced the car going lean on the streets, only the dyno. With all that said and done, the car has been sold. I miss it. I bought an 04 TL, and regret it.

whitebizzel88

i am having the same issues with my h2b set up. car made 216whp stock motor with plm header, skunk2 intake mani,skunk2 70mm tb, aem fuel rain, aem fpr, aen 320 fuel pump, braided steel line from tank to rail. car is fine for a few pulls on dyno then starts to lean out around 5500 rpms. car was also doing this when i had stock injectors, rail,lines and 255 walbro. any kind of response would be greatly appreciated!

BB1 H22A LUDE

Thread resurrected.lol

What are you using for tuning?

I experienced lean WOT issues (~14:1 at 5.5k rpm) whilst on a stock JDM P13 with just the usual H22A boltons, but with Crome, a known decent wideband sensor, a dyno and a good tuner there should not be any reason to have lean spots in the tune.

whitebizzel88

I am useing crome. I believe it ia leaning out at 5500rpm at like 15.8 or maybe little less.. The car will be fine for a few pulls then starts leaning out on its own. My tuner said he is stumped. Once it starts leaning out he adds fuel and nothing change. I believe he said from 60-100% duty cycle on the injectors nothing happens. If anyone has any suggestions please let me know. I have changed wire harness twice, injectors twice added grounds. My number is 4016549777 if its easier to communicate

AllMtrRex

What is the setup in detail?

DDTECH

If you wanna share your map, i'll be happy to look at it.

Its time you go to a "better" software. Look into Neptune.

whitebizzel88

I have a jdm h22a set up as a h2b in a 93 civic hatch. h22a long block, gsr transmission, 70mm skunk2 throttle body, skunk2 intake manifold, plm tri-y header, 2.5 inch skunk2 exhaust, aem fuel rail, aem regulator, aem 320 fuel pump, 370rc injectors, bigger (not sure on size) braided steel fuel line from tank to rail. tuned on crome. car leans out once vtec engages. I do not have a drop in fuel pressure

DDTECH

Sounds like its not tuned - Is this just a basemap or "chip" by chance?

whitebizzel88

I have a print out of my dyno sheet if that would help, when I made 201whp with stock rail, injectors and stock fuel system except a 255 walbro fuel pump. car astill leaned out when vtec engaged. I am looking into hondata I a, running low in funds trying to fix this issue. between new fuel system and dyno time I speny $810.

whitebizzel88

he was in the middle of tuning the car on the dyno when the car started to lean out. if I recall correctly he said he tried adding fuel to see if it was the issue. he changed the duty cycle from 60 to 100% and nothing changed. (not sure if I am explaining that correctly) I do know that he was trying to tune it though

DDTECH

I suggest trying another software. Crome is a nice program for bolt on to stock stuff.. Its been well proven that the timing values in crome are off slightly as well as other glitches.

Look into Neptune, find more @ Hrtuning.com.. you'll thank me later, i assure you.
It just sounds like a software issue, you're not running out of injector and the FP is no where near maxed.

whitebizzel88

I think he has a version of Neptune where he is able to burn it on to a chip like crome. I think he tried with Neptune as well not 100% though. I do appreciate your input and I plan on saving money for hondata.

whitebizzel88

Rocket

Do you have a adjustable fuel pressure regulator? I had one that the lock nut wasn't tightened and this caused the motor to lean out up top.

slowsleeper

I have a friend who's had this exact problem before on his B series. his car on the low cam would run fine etc but as soon as it crossed into VTEC, itd go lean no matter what was done to the tune. Turns out that the end plug on the OEM rail was the culprit. Try a different fuel pressure regulator as Rocket suggested, make sure there is a washer both on top and below the fuel line from the filter to fuel rail.

whitebizzel88

I have an aftermarket filter with fittings no washers needed. can you explain more on the end plug? I tried 3 regulators already. I will check the end plug but I'm a little unsure of what you are talking about. If you could explain it better. I upgraded to an aem rail as well

slowsleeper

Oh ok. If everything checks out and is aftermarket then could be Crome itself. You try a different ECU?

DDTECH

Graph is hard to see, but ya, i see like 14.9?

Have you changed your fuel filter lately??

Tou's idea is good to, that plug sometimes does cause weird things.
Another good idea is to try another good ecu, sometimes the injector driver might be bad?.. throwing out ideas.

Also, Neptune+Demon is like 399.00, does everything hondata does vs 695. If he has the "chip" version, then he's a neptune dealer. I'd try using that..

only thing i can think of is you really dont have 370cc injectors and still are on 290's. If i recall 290's are good to around 190-200whp or so..

AllMtrRex

I don't know much about crome, and data-logging. I know it's possible with the HULOG interface, but a good full throttle to fuel cut pull while logging would more than likely be all you need to diagnose the problem if it is in fact not any of the issues suggested above. However, I do suggest moving over to a demon board (ectune, neptune) or s300 for more in-depth feedback from datalogs.

whitebizzel88

thanks for the advice everyone we are going to go through the entire car from top to bottom this week. I will post results

Rocket

I think Slowsleeper is referring t the fuel pulse dampener that is on the end of the fuel rail.

whitebizzel88

I do not have this type of fuel set up. but thank you. I have an aftermarket fuel system.

Rocket

Is the fuel pump stock with stock wiring or circuitry? Or is it aftermarket/custom and custom wired?

whitebizzel88

I have am AEM 320 fuel pump and its on a 4 wire relay so its direct at its peak power at all times. car had same problem with a 255 walbro with stock wiring.

Rocket

Okay, fuel pump/pressure source sounds okay on a first-pass investigation.

Next.

Can you post the 2D and 3D graphs of your fuel map?