i have a 06 SC, my mod are cold air intake , GM stage 2. header down pipe and cat back . i want to change my stage 2 pulley (3.1 ) drop to 2.9.
my question is 2.9 pulley will be safe with stage 2 injectors?

 

I've heard yes and no. I would lean at no, at least get a wideband

 

usually the stage 2 injectorsare good down to a 2.9, anything smaller you wanna go 60's but you should def have a wideband, and if you can an interceptor
the interceptor will let you see the duty cycle of the injectors and see if you are exceeding it, the stage two injectors can flow more than 42 lbs/hr what happens is the fuel pump compensates for the limited flow of the injectors by forcing more pressure into the fuel rail intern forcing more fuel through the injectors. The injectors can only take this excessive flow for so long before biting it

 

word^^^^

 

get a tune with 42's and the 2.9 and you'll be fine

 

my car has had a 2.85 on it for 2 years now on a stage 2 tune with no issues. i dont recomend it, the car does go lean up top (i see 11.9-12.1 just before the limiter), max i would go knowing what i do now is 2.9. im gonna go with 60s/ott tune soon here.

 

if i get a 60s from ott , do u guys know how much they charge for the tune?

 

everything is listed on their site. iicr the injectors are $175, injector harness is $35 and the tuned pcm is $115 (it also has a $125 core charge on it).