what will happen if i run the 2.8" pulley with 42# injectors?

 

unicorns will happen

 

Your Injector duty cycle will be well over 100%. I was seeing 113% IDC on a 2.9 and 42s. The potential of going static is far greater.

Go buy yourself some 60s, and get tuned.

 

If your on a stage 2 tune, its absolutely stupid. The tune is horrible and your idc's on any tune will be through the roof and you will be static. You need 60lbers and a good solid tune. Not even to mention cooling mods. Without any cooling mods your iat2s will be through the roof.

 

im at 85% with the gm stage 2 pulley with 42.5# im pretty much maxed out

 

Ya on the 2.8inch pulley his idc's would be roughly 130% aka static.

 

it's not worth the extra boost having the 2.8 rather than the 2.9 with 42's

 

You will start a long boring thread with a few people swearing up and down they can run the pulley, and a whole bunch of other people arguing you can't.

 

haha yeah pretty much...Run a 2.9 and be done with it

 

almost forgot to mention. Some people will chime in saying that the IDC will be %197,000. Give or take.

 

Haha, Lol! Altitude will play a big roll on this subject too. Some guys in Colorado are running the 2.8 on 42.5's with no trouble and are not static. I know of a guy running stage 2 + 2.9. Seems to have no trouble and he is a very good mechanic. I trust he knows what he is doing.

 

Jesus will say he hates you.

But seriously...you're boost will get higher by about 2 psi (from 2.9) but your injectors will or will not be in cahoots with Jesus (in saying they hate you). Really...truly...honestly...it does nothing to hurt a daily driver. Us idiot redline trial and error guys have run 2.8's for a long time across the country and there was a dude that hit over 30k miles without any engine problems or injector problems so...if you don't go over 6k in each gear most of the time I say go for it. I ran a 2.8 for about a year and a half on the s2 tune (15k miles roughly) no problems at all, I run a 2.9 now only because my 2.8's bolt holes got stripped when I was swapping pulleys.

I've run a 2.7 short term and it's fun but not something I'd do more than 100 miles at a time.

 

im 2.79 with stg2 tune and my car runs phenominal...i see 17 18 psi all day long..but i dont beat on her..andf coolant stays at 180..

 

mperez has 2.8 on 42.5's for a while now

 

Puts flame suit on...

Sorry for being a noob, but... oh wait *adjusts crotch area* mkay.... what are Iat2s?

 

Intake Air Temp 2? My best guess.

 

gentlemen, you can run a 2.8 on 42's, i've been doing it for over 6 months now, and i dont see over 80-82% at the very most idc

it's all in the tuning

 

I have a 2.99 pulley and I'm at 100% at redline with 42's

 

I have a 2.8" on 42s with meth, and my injectors are at 97%, max for them is about 120%.

 

like stated before, it's all in the tuning.

i run at the leanest 11.7 afr on my aem uego wideband, and logging shows that my pulse width and idc's are in the safe zone

oh, and max for 42's is not 120%, it's 100%. anything over 100% is taking the injectors beyond their intended capabilities

however, you still want a safe zone, like say a 20% buffer, just in case

 

i have a 2.8 with 42.5s...

Stage 2 tune i heard is bad to use with a 2.8 pulley..

I have a custom tune... If you can get one of these (a good one).. i wouldnt go under 2.8 but its doable...
ONLY with a custom tune... stage 2 tune = no good...

k?

 

exactly my point. anything below a 2.8 is

#1 maxxing out the 42.5# injectors
#2 taking the blower out of its efficiency range (per eaton, the reccomended pulley size for efficiency is 2.8)

 

yes... even if you had the 60s.. i dont think its a good idea to go below 2.8... If the smaller pulley did wonders without repercussions everyone would have a 2" pulley

 

i was on a 2.9 and it ran great...then i got a custom hp tune done by a local tuner and it's even better..Then again i would never slap anything on less than a 2.8 just for the S/C sake.

 

exactly.. its possible to run... tahts not what anybody is saying..

its just not a good idea....