TB sync

I know there are plenty of threads about the internet on this topic, but as it's my first time doing this on the millono i figured i'd atleast explain what i've done to achieve what i believe should be accurately sync'd throttle bodies and CO trims in reasonable to good tune...

I'd been reading around and you can do it all by ear to a certain degree of accuracy.. so that's just what i did.. you wind the idle adjuster right off, and adjust the air screws and co trim pots. to get the smoothest low speed idle you can get.. then lean the rear cylinder out so it operates on ever so slightly less vacuum than the front cylinder and set your idle..

so i set up my vacuum gauges off of the little vacuum lines with adapters from my mityvac, starting from 2 turns out on each cylinder working my way in until the idle dropped a tad, then on to the CO trim pots again adjusting these to bring the sound of the idle to a more even rumble rather than a chuggity chug chug (horrible onomatopoeia i know) lol keeping the vacuums reasonable close to equal at this point with the idle sitting just over 1k... i continued this until i was happy with the smoothness of the idle and the crispness of the throttle response and then proceeded to wind the bypass on the rear cylinder back about 1/4 turn reducing vacuum on the rear cylinder ever so slightly... checked throttle response and low idle again and once happy adjusted idle up to about 1450rpm..

just going to head down to somewhere that offers mot prep services and use their emissions tester.. commutively the CO levels exhaust side should be in and around 8% so aslong as im in the ball park i know i've got it pretty much bang on..

does this sound to be in and around the correct procedure? I know you will never get it perfect by ear or unless your able to measure the CO levels of each cylinder independently, but im sure you can get it reasonably on it if you pay close attention..

thanks all..

Well at any rate she's idling a lot better and I know the tbs are in sync.. going to take her for a blip hereand see what the verdict is

ok so had her out all day today.. low down i think she's near enough where i want her.. top end is 100% aswell.. took her down to the nearest mot prep garage and got her fired onto the EGA just took a reading from the exhaust as they were pretty busy.. so people have been saying that they should be between 3.5 to 4... taking a reading at exhaust would get an average atleast to give me an idea.. so i've managed to get CO to 3.36% by ear.. now to me that doesn't seem to bad..

only thing i've noticed is the midrange isn't quite there yet, although i noticed that the midrange punch was alot stronger on map two of my dr.rossi chip.. so i have switched it on to 2 to see how she goes next time i have her out..

so all in all i don't think i'm too far off...

forgot to add.. will pull the plugs out before she goes for her next outing to see how they're looking.. my first guess is she is maybe still a tad lean... i'll keep this post updated as it could potentially save others money on paying someone to do something they could easily do themselves...

Where do I get one of those bad boys?

so what gains would i expect to see from installing this? did i read correctly that there are pressure regulators you can steal from the newer models?

ok so pulled the plugs today for a quick check.. all looks to be in order... nice baked brown plugs

ref..


here are the plugs...
rear cylinder


front cylinder



couple of the images there are a tad underexposed but they are all the same colour as image no.3

on map 2 now to hopefully improve the midrange.. scalp tomorrow so all will be revealed...