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70mm throttle body

t-rav

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hey all just put a 70mm throttle body on my v6 VS and power gain is good but on start up car idles too high starts at 2000rpm then climbs all the way to 3250rpm.. this stopps after warmed up and after a good thrashing haha
idle returns to around normal 500-600rpm

just woundering wether i need a retune or not ??

air fuel ratios maybe ??..
any help would be great
cheers
 

clubby_you

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i would be guessing that due to different tolerances or this new throttle body being alot cleaner and allowing more air pas the butterfly that you ics is a bit old and sticky and is taking a while to adjust for the new throttle body try taking it off and cleaning with carby cleaner
 

t-rav

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ok sweet
ICS - is that ignition control system ?? and where abouts is that ???haha
sorry for the annoying question haha and thanks for the input
 

maldotcom2

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Someone correct me if i'm wrong but i thought at idle the butterfly is completely closed and it's just the IAC that lets air in, therefore size of said butterfly shouldnt affect idle. Maybe the computer just needs time to recalibrate something to do with the TPS?
 

delcowizzid

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the butterfly is allways cracked a little it may need the IAC cleaned and reset
 

clubby_you

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ics = idle control solenoid

and yes the butterfly is completely shut ..but nothing is perfect and could be allowing a small amount of air past causing a high idle until the ics can compensate for said air

cheers doug
 

t-rav

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ok thanks guys.
will tackle the problem soon for now the standard throttle body will have to do .
cheers trav..
 

t-rav

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ok well i cleaned the ICS and disconnected the battery for 20 seconds and reconnected still idleing high ..
so i thought it may be my car so put it on my mates VT ecotec and same thing idling way to high .
so im thinking that retune is only option..
 

delcowizzid

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the tps sensor could be reading too high
 

greenfoam

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There will be too much air getting in one way or another past the butterfly, you might be able to adjust the stopper a little. 70mm is too big for a ecotec anyway. You need a fair decent 5 litre to see a gain with one
 
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