am I running super rich ?

HAITHAM · 11-13-2001, 03:11 AM

When I cursing in 2nd. or 3rd. gear, just I hit the throttle to maximum, the rich/lean gauge shows maximum rich in that time , is this ok or I am running super rich ?

PKRWUD · 11-13-2001, 05:30 AM

Your ECM defaults to rich when at WOT. In other words, you're fine.

Take care,
-Chris

HAITHAM · 11-13-2001, 06:50 AM

Chris,
You are always the support.

Regards,

jimberg · 11-13-2001, 07:28 AM

HAITHAM,

Chris, of course, is absolutely right, but I thought I would use this opportunity to explain the rich/lean gauge a little.

Our cars use narrow band oxygen sensors that can really only accurately measure near stoichiometric (14.7:1) air/fuel ratios. This is why there is a closed-loop and open-loop control mode. If we had wide band oxygen sensors that could accurately measure air/fuel ratios on the rich end (13:1) or richer, then our computers could always run in closed-loop control mode and give us better performance by giving us more precise fuel management.

Instead, the computer just uses some lookup tables based on MAF, ACT, ECT, and BAP/MAP(if SD) reading to get us in the ballpark of 13:1 at WOT. Since 13:1 is way outside of your oxygen sensor's range, your gauge will just peg at rich. You should be concerned when you are at WOT and your gauge isn't reading rich. In that case, you're running dangerously lean and could potentially damage your engine.

I don't actually have a gauge, but do you ever watch it when you startup in the morning? It should be pegged at rich, and then when the car gets to operating temperature, it should start bouncing back and forth between lean and rich. When you see it start to do this, you are in closed-loop control mode.

11-13-2001, 03:11 AM	#1
HAITHAM Registered Member Join Date: Jun 2000 Location: Saudi Arabia Posts: 130	am I running super rich ? When I cursing in 2nd. or 3rd. gear, just I hit the throttle to maximum, the rich/lean gauge shows maximum rich in that time , is this ok or I am running super rich ? __________________ 94 COBRA # 926/5009 TFS track heat heads (ported), Cobra intake (ported), 24# Injectors, 3/8" Phenolic spacer, CompCamsXteremeEnerge 224 232 555'' 565 112, CompCams Pro-Magnum 1.6 RR, BBK 1 5/8" headers, BBK 65mm TB, Pro-M 80mm MAS, Next Generation PIH kit w/ A9L computer, 3.55, BBK 190 lph fuel pump, Paxton fpr, MSD'S, March Pulley's, Pro-5 tower power shifter, Intellitronix Air/Fuel gauge, Eibach Sportline Springs, Tokico 5-way adjustable, Granatelli Motorsport Subframes, Edelbrock Mufflers, 2.5" exhaust system, Pfgoodrich comp T/A drag. Previous Mode: E303 Cam, TFS 1.7 rr '92 Integra LS.

11-13-2001, 05:30 AM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Your ECM defaults to rich when at WOT. In other words, you're fine. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

11-13-2001, 07:28 AM	#4
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	HAITHAM, Chris, of course, is absolutely right, but I thought I would use this opportunity to explain the rich/lean gauge a little. Our cars use narrow band oxygen sensors that can really only accurately measure near stoichiometric (14.7:1) air/fuel ratios. This is why there is a closed-loop and open-loop control mode. If we had wide band oxygen sensors that could accurately measure air/fuel ratios on the rich end (13:1) or richer, then our computers could always run in closed-loop control mode and give us better performance by giving us more precise fuel management. Instead, the computer just uses some lookup tables based on MAF, ACT, ECT, and BAP/MAP(if SD) reading to get us in the ballpark of 13:1 at WOT. Since 13:1 is way outside of your oxygen sensor's range, your gauge will just peg at rich. You should be concerned when you are at WOT and your gauge isn't reading rich. In that case, you're running dangerously lean and could potentially damage your engine. I don't actually have a gauge, but do you ever watch it when you startup in the morning? It should be pegged at rich, and then when the car gets to operating temperature, it should start bouncing back and forth between lean and rich. When you see it start to do this, you are in closed-loop control mode. __________________ 351W 89 Mustang GT Convertible

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11-13-2001, 06:50 AM	#3
HAITHAM Registered Member Join Date: Jun 2000 Location: Saudi Arabia Posts: 130	Chris, You are always the support. Regards,