Would it be worth it to go from a 2.9 down to a 2.85 pulley?

 

not really, esp if u have the 42lb injectors

 

if you get a 2.85 a tune is recommended. With a 2.9 stage 2 tune is just fine. as it is the stage 2 pully almost if not maxes out the 42s IDCs

 

I need to find some way to lean my car out,it's running crazy rich and there is no tuner in my area.

 

running rich is great leaning it out is bad very. But the 2.9 will lean it out a good bit

 

Yeah i have the 2.9 on already but like i said it's running crazy rich and the tip of my exhaust is completely black

 

Well you don't want to lean it out by downsizing pulley. Technically its not leaning it out its just running your injectors as hard as they can go and them not being able to keep up so your tune is still as rich as ever but your injectors can't keep up while giving you everything they've got. For the health of your car, you'd probably be better off staying as is or youll be putting alot of stress on those injectors.

 

bingo!

 

amen.. lol

 

I suggest tuning the 2.9, you want to find a happy medium between how lean or rich you are 11.5 is pretty good for both.

 

And to answer the actual question you had, no I don't think it would be worth it to go from 2.9 to 2.85 because

1. Extra ~50-60$
2. Performance gains will be negligible. If you're upgrading for performance do it right.
3. Car health reasons as stated above
4. Nate recommends a 2.9 as the lowest you should go on s2 injectors

 

WTF? PULLY SIZES CANNOT CHANGE YOUR A/F OOOOOOOOOOOH LORD, adding a pulley will not Change your air fuel and make your run leaner. the reason people run lean is because these 2 pulleys make you go over 100 percent idc and sometimes when you go over a 100 percent idc it makes your injectors go static causing your car to run lean which can damaage your engine.

i had logs of the 2.85 and 2.9 on 2 different cars at the same night idcs where the same boost where the same only thing that was different was iat 2

 

Exactly I just addressed this in another post where someone suggested that a 2.9 would lean out a stage 2 tune!

 

yeah, i hate that "Leaning out your tune with smaller pulley" propaganda, but it may max out injectors which is bad anyways. I've got a 2.9 on a stage 2 and i still fear my IDC's. With my wideband, one thing that may have leaned me out a tad was rebel's 3" intake, and maybe the super amounts of cooling mods and some supercharger porting, i'm seeing 11.3-11.8 at WOT still on factory stage 2 tune.

 

id stay 2.9 for safeyt for stage 2 tune

 

2.9 is the lowest I would go without a tune....

Comming from someone who ran a 2.85" untuned for awhile you car gets really really angry!

I am running a 2.80" now on my 42's and it's running strong! YAY!

 

i have the 2.85 man and my tip of my exhaust is completely black also so dont feel bad