Redbock afr reading

Steerfromdarear · Jun 22nd, 2024, 17:48

My 940 has chipped ecus vxr injectors 3inch diy maf t25 turbo ajustable fuel pressure regulator.
My afr gauge is around 15 normal driving and at 15psi the went just below 10 today what should I look for

TonyS9 · Jun 23rd, 2024, 21:36

Assuming this configuration worked before and gave suitable fueling, you either have

High fuel pressure, missing vacuum line on pressure reg
High flow reading
Faulty injector or wiring

Maybe leaky injectors.

Steerfromdarear · Jun 23rd, 2024, 21:41

Thanks for reply What reading do you recommend

TonyS9 · Jun 23rd, 2024, 21:48

I don't know really, but 10 seems a bit rich. 12 seems to be the recommended on the street.

Arthur1330 · Jun 25th, 2024, 12:09

Quote:

Originally Posted by Steerfromdarear

Thanks for reply What reading do you recommend

Anything below 10 on full boost / throttle is pretty rich, saying that running rich is safer than lean!

Mine run arounds 10.5 - 11.5 on full boost / throttle, wouldn't want to see anything into the 12's just to be safe.

14 - 15 is pretty much spot on for normal driving.

Im running the same VXR injectors, with a 21t and stage 3 chips from Classic Swede!

B10B · Jul 1st, 2024, 21:02

The first question would be has it always dipped that rich or has it started doing it?
It's quite a lot of injector for a T25 @15psi so your chips fuel map might be causing overfueling on full load.
Failing wideband sensors tend to record rich, I've had this happen once, the engine ran fine but apparently it was in the 9s until I renewed the sensor.
I've had a true rich running problem on load which was my also DIY 3" amm, no black smoke but exhaust stank of petrol, I would deff check that.
Also a loose injector ground on the inlet manifold but that caused rich condition across the board.
Just a few things I've come up against over 5 years of running a bread and butter 250hp setup.

Jun 22nd, 2024, 17:48	#1
Steerfromdarear Junior Member Last Online: Jun 23rd, 2024 21:54 Join Date: Sep 2017 Location: London	Redbock afr reading My 940 has chipped ecus vxr injectors 3inch diy maf t25 turbo ajustable fuel pressure regulator. My afr gauge is around 15 normal driving and at 15psi the went just below 10 today what should I look for

Jun 23rd, 2024, 21:36	#2
TonyS9 Premier Member Last Online: Jul 2nd, 2024 01:13 Join Date: Jul 2009 Location: Holywood	Assuming this configuration worked before and gave suitable fueling, you either have High fuel pressure, missing vacuum line on pressure reg High flow reading Faulty injector or wiring Maybe leaky injectors. Last edited by TonyS9; Jun 23rd, 2024 at 21:50.

Jun 23rd, 2024, 21:41	#3
Steerfromdarear Junior Member Last Online: Jun 23rd, 2024 21:54 Join Date: Sep 2017 Location: London	Thanks for reply What reading do you recommend

Jun 23rd, 2024, 21:48	#4
TonyS9 Premier Member Last Online: Jul 2nd, 2024 01:13 Join Date: Jul 2009 Location: Holywood	I don't know really, but 10 seems a bit rich. 12 seems to be the recommended on the street.

Jul 1st, 2024, 21:02	#6
B10B Bald Last Online: Jul 1st, 2024 21:38 Join Date: Jun 2010 Location: Ipswich	The first question would be has it always dipped that rich or has it started doing it? It's quite a lot of injector for a T25 @15psi so your chips fuel map might be causing overfueling on full load. Failing wideband sensors tend to record rich, I've had this happen once, the engine ran fine but apparently it was in the 9s until I renewed the sensor. I've had a true rich running problem on load which was my also DIY 3" amm, no black smoke but exhaust stank of petrol, I would deff check that. Also a loose injector ground on the inlet manifold but that caused rich condition across the board. Just a few things I've come up against over 5 years of running a bread and butter 250hp setup.

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