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Cruise control pulsing (for lack of a better word)

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gottabfast

Post subject: Cruise control pulsing (for lack of a better word)

Posted: Sun Jun 26, 2011 3:32 pm

Joined: Sat Jul 18, 2009 6:58 pm
Posts: 14
Location: Marysville, OH

I have a Turbo B18C in a 2000 Si, controlled with a S300. When I'm in cruise control around 68-70mph (around 3700 rpm in 5th), my MAP values bounce between 45kPa and 75kPa, AF stays between 13.8-13.6, ignition changes by about 4 degees. If I hold at 70 with my foot on the gas (no cruise control) it stays between 52-56 kPa. Anybody have a fix for this?

Thanks!

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-Zack

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Spunkster

Post subject: Re: Cruise control pulsing (for lack of a better word)

Posted: Mon Jun 27, 2011 10:12 am

Site Admin

Joined: Fri Sep 20, 2002 5:06 pm
Posts: 11094
Location: Hondata

This sound slike a problem with the turbo setup itself. Without datalogs it is impossible to say for sure, but you are probably just spooling up at that point and that mans that the cruise keeps adding throttle to get it up to speed and this increases boost and causes it to go over speed then it drops downa nd keeps going back and forth.

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crucian

Post subject: Re: Cruise control pulsing (for lack of a better word)

Posted: Tue Jul 05, 2011 1:15 am

Joined: Sat Dec 10, 2005 9:42 am
Posts: 140
Location: Germany

Spunkster wrote:

but you are probably just spooling up at that point and that mans that the cruise keeps adding throttle to get it up to speed and this increases boost and causes it to go over speed then it drops downa nd keeps going back and forth.

This is more than likely the problem.

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