Power enrichment / time necessary?

**Juanmiguel** · 03-31-2011

So I took the GTP to the track today, just to find out that I didn't gain anything at all with my tune... lol.

The only thing that bothers me is the PE_RPM_vs_TIME_A/F table. As you know, it modifies AFR over time. Which I don't know if it's entirely necessary I was trying to get around 11.2 AFR at WOT.

Can I set this table to 0's and have the same AFR? Would it hurt?

Here's a scan I took in the last pass. I have AFR set to 11.6 here, but the time A/F table made me run rich: (any thoughts about the scan - tune are also welcome. I already took care of the KR that showed up)

**01gpgt01** · 04-01-2011

Mines Zeroed out untill 14.4 sec. I would not zero it out unless you are using a wideband. commanded AFR means dick. If thats your wideband AFR im seeing in your scan you have alot of PE tuning to do. You Ideally want to get your commanded AFR to match what your wideband says. Makes things easier. If you dont have a Wideband, You really need to invest in one.

**Juanmiguel** · 04-01-2011

I'm not using a wideband. I know the narrow band and the commanded AFR are not accurate, I was wondering what's the point of modifying the commanded AFR over time. Is it to somehow make up for the narrow band inaccuracy?

**Bio248** · 04-01-2011

more load on the engine means you need more fuel to quelch the oncoming detonation.

**01gpgt01** · 04-01-2011

Originally Posted by Bio248

more load on the engine means you need more fuel to quelch the oncoming detonation.

X2, But as you will find when you get a wideband it will be way off and you will just zero most of the table out and use it to add fuel where needed. I start the 1/4 mile at 12.1 afr finish with a 11.7 afr FWIW

**jdmgtp** · 05-14-2011

I agree get a wideband on there. You shouldn't have any problems running 11.0-11.5 a/f ratio with full timing at those boost levels. I bet your quarter mile times were terrible.

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