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cbr1100xx 10-12-2012 10:23 AM

1st gear rev hang?
I notice when I rev my '10 5sp hard in 1st to maybe 4K rpm and then clutch in for 2nd gear, the rpms sort of hang and don't drop much at all.

Is this normal? It's kind of annoying. I did have a CAI that I took out. The shop said he "reset my computer" after doing it but maybe if I reset the ECU this would get rid of it?

I'm guessing just disconnect the negative terminal of the battery for 20 min or so......

Wondering if anyone else experience this rev hang.

AllCarFan 10-12-2012 12:33 PM

"resetting your ECU" - yeah the shop just disconnected your battery for a bit. I have an 05 that doesnt have a drive by wire, my rpms hang too. COmmon on Fords.

Miller88 10-18-2012 12:54 PM

Extremely normal on DBW fords. If I put mine in neutral and cost to a stoplight it's idling at 2500RPM.

Our F350 idles at 1500RPM when sitting still. Dealer has always said it's normal.

PSUrivie 10-18-2012 01:57 PM

Yeah it normal especially with the DBW cars. Another thing to note it that the stock flywheel is pretty heavy and will cause the revs to hang some.

w2s2008 10-18-2012 09:32 PM

DBW does this to reduce get a hydrocarbon spike when the butterfly snaps closed VW has tuners out to minimize this im unaware of any for the focus yet but im new to the focus aftermarket so there very well could be one for them also

sleepyboy 10-18-2012 09:42 PM

The hanging revs is purely for emissions reasons. The first gen focus did this also, it has nothing to do with DBW cars. Mainly American cars do this but now also some of the foreign cars do this too now.

w2s2008 10-19-2012 09:23 AM

Dive by wire is what does this for emission yes they did it other ways in the past im sure but a 2010 has a "slow" close throttle response strictly do to the drive by wire logic used by the controle mod also why i would have to think someone out there offers a tuner to help with this

bones33 11-06-2012 06:18 PM

Anyone? This fast idle, rpm hang business is really getting old. I would love to have a tune that made the engine run correctly. Emissions can't be affected all that much. Hydrocarbon spike? Cats love extra hydrocarbon, that's why they sometimes run rich to keep them lit.

With a tuning device one can always reflash when the time comes.

Miller88 11-07-2012 01:37 PM

Crappy stock programming

sleepyboy 11-07-2012 04:05 PM


Originally Posted by Miller88 (Post 4444533)
Crappy stock programming


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