Gen 2 high timing at wot

[turb0buick57]

I am trying to help a friend out with this issue. I'm sure he will post at some point.

The issue is he has wot spark adv set for 21 degrees from 2k-5k rpms. However the car will not hold that spark adv and quickly climbs to 25-27 degrees at wot.

He has a gen 2 and pnp harness with wideband installed on a mostly stock gn with razors alky. His chip is an extender from fullthrottle.
volt out 1 and v2 are both set to spark control. Setting volt 1 to spark control and volt 2 to setpoint did not reduce timing any.



Anyone have a solution or some insite on why the timing won't stay down at 21 degrees?


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[turb0buick57]

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[turb0buick57]

The screen shot is of the same run. Initially the timing held 21.9 then started creeping up to 25. I know the wideband is reading really rich, but was concerned about taking more fuel out with the timing not right...

 

[TurboBob]

the spark advance is based on the calculated "air load" in the chip, when you lean things out a lot with the Gen-2, the result is higher timing.

Post the log so I can take a look, but how much fuel are you pulling out? Also, what is the chip number?

You can dial the timing down further with the Gen-2 at higher RPM, but probably don't need to. Higher timing at higher RPM works, as long as you have the fuel to feed the engine.

Bob

 

[turb0buick57]

here are a few powerlogger files
chip # GSJX7A06A

 

[TurboBob]

there is a lot of fuel pulled out in the chip, and you are pulling more out with the Gen-2, to cover for the alky,

what injectors are in the car? What wideband?

Bob

 

[turb0buick57]

42lb injectors...009s. And the aem inline.



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[buick86]

These runs were made with wb correction set at
min tps 3.00
min rpm 3200
min load 166.4
lean lim.% 10.0
rich lim %25.0
gain 12.0
afr 10.8 from 2000-8000
aux % 0.0
af trdelay 0.3

Thanks for any help!