Erratic air fuel ratio on b16 84mm turbo

Calibrations for S-Manager - Use all calibrations at your own risk (dyno tuning recommended)
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Reezo
Posts: 5
Joined: Thu Jul 16, 2015 3:30 am

Erratic air fuel ratio on b16 84mm turbo

Post by Reezo »

Good day

So I just complete my build :
sleeved B16 84mm
Wiseco pistons 8.8 comp
Eagle conrods
Custom log style intake manifold , no iacv (been disabled on s300)
63mm boost pipes
A/r 50 intake and 48 exhaust turbo
Ebay 38mm external wastgate
EBay dumpvalve
Aem wideband gauge unit 30-4110
Ram horn style manifold
Precision 880cc injectors
Stock map sensor (for now )

Hondata s300 with obd2b jumper harness.

So my tuner loaded a base calibration and we got car started . after many attempts we can't get the air fuel ratio to remain constant it jumps around from rich to lean . the distrubutor timing is at 17° which relates to value in s300 , Map reading 0.32mbar , injectors at 1.22ms which is constant . this erratic air fuel ratio continues even if rpm is held at 2000rpm .

I will attach the calibration as well as a datalog .

Kind regards
Reece
Attachments
AJRacing7.skl
The calibration
(51.3 KiB) Downloaded 96 times
start 8 10% trim.s3d
This is the datalog
(1.64 MiB) Downloaded 97 times

Reezo
Posts: 5
Joined: Thu Jul 16, 2015 3:30 am

Re: Erratic air fuel ratio on b16 84mm turbo

Post by Reezo »

This calibration attached is just some changes we done today , air fuel is a lil more stable but they not as consistent as I want them to be .
Attachments
AJRacing8 02-08-15.skl
(40.98 KiB) Downloaded 111 times

Reezo
Posts: 5
Joined: Thu Jul 16, 2015 3:30 am

Re: Erratic air fuel ratio on b16 84mm turbo

Post by Reezo »

ANY HELP PLEASE ?

I WILL BE CHANGING OUT INJECTORS TO 900CC FUEL INJECTOR CLINIC UN THE HOPE IT HELPS

hpmx18
Posts: 211
Joined: Tue Feb 17, 2009 6:47 am
Location: U.S.A

Re: Erratic air fuel ratio on b16 84mm turbo

Post by hpmx18 »

did u put the dead time what pte say the 880cc are suppose to be when i have issues like that its either dead times or fuel issues could b injectors or fuel pump or fuel regulator sometime even a fuel line
LGMotoring

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Spunkster
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Re: Erratic air fuel ratio on b16 84mm turbo

Post by Spunkster »

Where is the wideband installed?

Reezo
Posts: 5
Joined: Thu Jul 16, 2015 3:30 am

Re: Erratic air fuel ratio on b16 84mm turbo

Post by Reezo »

Good day

I have tabulated injector dead times as per precision specs supplied to me by them .

My fuel pressure is a constant 40psi at idle .

And my wideband sensor is installed on downpipe as per aem specs .

The injectors are brand new tho ? That's y I'm confused here , I can't seem to pin point the prob .

Spunkster , taking a look at the calibrations and log file can you see nothing odd ?

Kind regards

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Hondata
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Location: Torrance, CA
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Re: Erratic air fuel ratio on b16 84mm turbo

Post by Hondata »

The injector dead times are much too low, but I think there are other issues as well. If you look a the datalog the manifold pressure is fluctuating a lot. I suspect that the base ignition timing is off too.
Hondata

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