70mm throttle body

[t-rav]

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]

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]

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]

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]

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

[clubby_you]

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]

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

[t-rav]

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]

the tps sensor could be reading too high

[greenfoam]

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

[RoboticCherry-Coke]

Hmmm i have been thinking bout putting a bigger throttle body on my VS and if 70mm is to big how big would you recommend? I also heard that putting a bigger throttle body on does require a tune, if this is the case is this something that you can do greenfoam?

[tivoom]

Sorry to jump in but how do you "reset" the ics as my auto started sliping heaps bad with a 65mm tb but just replaced the box as it was rooted so im hoping to get it sorted


Thanx

[Zuicider]

as with all remanufactured throttle bodies u may need to adjust the way the butterfly sits on the shaft. check for rub marks in the bore and compare with the other side. also hold up to the light when closed and u can see. the most i bored out a vn to vr throttle body it was 74mm and then it was way to close. the max i could get out of a vs eco one was 69mm without making it dangerously thin. if its really 70mm you may experience warping .

[JA2Z]

Try This:

http://www.maceengineering.com.au/TH...STALLATION.pdf

or if that link doesn't work go there from here:

MACE ENGINEERING GROUP

Hope that helps.

Cheers

[t-rav]

sweet thanks for all the help i knoticed that MACE include a restrictor in the bootom inlet hose after bigger throttle body has been installed... i dont have one of these ..
also Greenfoam how much do u charge to tune a memcal >>?? i can post it to u and what not as i have a spare.

cheers for all the help guys LEGENDS
trav

[ephect]

u'll find ur shift points are up the shit too, which a tune is the only fix
when i had 69mm throt installed on mine, no power difference, just seamed like it coz of the quick throttle response

[DannyboyDS]

what does that restrictor do?