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Should I be going lean on deceleration?

 
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bosskong
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PostPosted: Thu Sep 16, 2010 3:38 pm    Post subject: Should I be going lean on deceleration? Reply with quote

After all the recent talk about spam, I figured I'd try to get the board back on topic. Smile

With my Innovate LC-1, I can tell that my AFRs are generally pretty good, except on deceleration, they frequently go way up into the 20s. Is this a problem or can I safely ignore it?

If I want to richen the mixture up on deceleration, what's the best way to do this without affecting my AFRs during ACceleration? (I'm using Nistune on a Z32 TT).
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DavidL
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PostPosted: Thu Sep 16, 2010 4:19 pm    Post subject: Re: Should I be going lean on deceleration? Reply with quote

[quote:1c1e0245c4="bosskong"]After all the recent talk about spam, I figured I'd try to get the board back on topic. Smile

With my Innovate LC-1, I can tell that my AFRs are generally pretty good, except on deceleration, they frequently go way up into the 20s. Is this a problem or can I safely ignore it?

If I want to richen the mixture up on deceleration, what's the best way to do this without affecting my AFRs during ACceleration? (I'm using Nistune on a Z32 TT).[/quote:1c1e0245c4]

I'm not sure how the factory programs this.

But this is probably the factory deceleration cut. On my haltech with decel cut turned on, injector cycle goes to 0, retards the timing by 8 degrees, my WB goes to 19 and leaner. 19 is the pretty much no injection. I have been running this for over a year without any issues. On the other hand, I haven't really seen any gas mileage improvement with it. So either way, it's not a big deal.


Last edited by DavidL on Thu Sep 16, 2010 4:21 pm; edited 1 time in total
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90TTZ



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PostPosted: Thu Sep 16, 2010 4:21 pm    Post subject: Reply with quote

Totally normal. The fuel injectors virtually stop when the engine is decelerating resulting in only air going through the engine and exhaust pipe.
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DavidL
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PostPosted: Thu Sep 16, 2010 4:28 pm    Post subject: Re: Should I be going lean on deceleration? Reply with quote

[quote:c45c54260f="bosskong"]After all the recent talk about spam, I figured I'd try to get the board back on topic. Smile

With my Innovate LC-1, I can tell that my AFRs are generally pretty good, except on deceleration, they frequently go way up into the 20s. Is this a problem or can I safely ignore it?

If I want to richen the mixture up on deceleration, what's the best way to do this without affecting my AFRs during ACceleration? (I'm using Nistune on a Z32 TT).[/quote:c45c54260f]

BTW, I see you have 850cc inj's too, what's your MPG?

I'm getting 14MPG average. It used to be 10-11 before I leaned out a bit on the low to mid-range accelerating but no boost.
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r34nismo
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PostPosted: Thu Sep 16, 2010 5:32 pm    Post subject: Reply with quote

Going lean on deceleration has never been an issue in my book as your engine is not under load. Acceleration and detonation is always the problem with timing issues.

All engines cut fuel to idle when decelerating.
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bosskong
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PostPosted: Thu Sep 16, 2010 8:41 pm    Post subject: Reply with quote

Thanks for all the tips, I guess I won't worry about it.

Regarding my MPG, I've probably only put a couple hundred miles or so on the injectors so far and a lot of those miles were from doing drag racing style runs, so I'm not really sure what my fuel economy is at the moment.

Also, I've been driving my 10 mpg truck around for the past six months or so while I've been upgrading my car, so all I can really say is that the mpg in the Z is definitely a lot better than the truck... Smile I was guessing maybe high teens or low twenties at this point, but I'll keep you updated when I have a better idea.
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nzniggles
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PostPosted: Fri Sep 17, 2010 8:50 pm    Post subject: Reply with quote

[quote:7751eed1d6]Going lean on deceleration has never been an issue in my book as your engine is not under load[/quote:7751eed1d6]Agreed
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