2.9 pulley on 07 ss/sc - Cobalt SS Network



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Old 07-06-2009, 03:14 PM   #1
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2.9 pulley on 07 ss/sc

I was wondering if putting a 2.9 pulley on a 07 ss/sc with an intake really worth it. I probably wont be doing much more for a while until i save up for an exhaust
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Old 07-06-2009, 03:16 PM   #2
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hope you have the supporting mods like a tune and perhaps bigger injectors
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Old 07-06-2009, 03:16 PM   #3
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if all you have is an intake, then dont do it. you will need to upgrade injectors, stg2 belt, and tune along with the 2.9.
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Old 07-06-2009, 03:17 PM   #4
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are you already staged?

if not you will need atleast 42# injectors to be safe.....2.9"+stock injectors an 0 tune = bye bye


EDIT: ^^^^^^^^^^^^^^^^^^^for once evry one agrees...lololol
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Old 07-06-2009, 03:45 PM   #5
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you can run a 2.9 with 42lb injectors fyi
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Old 07-06-2009, 04:21 PM   #6
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shortened belt, 42's, and i would suggest the stage two tune, or a custom one would be better, but if someone has exp on running a 2.9 with the base map i would be interested in hearing how it worked
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Old 07-06-2009, 06:30 PM   #7
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just go with 2.8 pulley and 42 injectors, and a tune.
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Old 07-07-2009, 12:03 AM   #8
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Originally Posted by rcorona8 View Post
just go with 2.8 pulley and 60 injectors, and a tune.
fixed.
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Old 07-07-2009, 12:08 AM   #9
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I would say stick with the 2.9 and 42's. 42's already are maxed out at higher rpms with the 2.9 pulley. You need 60's for a 2.8. This comment will probably start an argument. Should be funny.
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Old 07-07-2009, 07:58 AM   #10
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well you could run a 2.8 with 42lbs. but you also would have to run meth also so that the injectors aren't maxed out. but if you have the money you can get 2.8 and meth and 60lb injectors.
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Old 07-07-2009, 08:09 AM   #11
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wouldn't the stock tune just bleed off anything higher than 12.5psi no matter what the pulley
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Old 07-07-2009, 11:22 AM   #12
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Originally Posted by rcorona8 View Post
just go with 2.8 pulley and 42 injectors, and a tune.
with a 2.9 the stage 2 42's are at 101 idc, at 7k rpms, if your gonna drop down to a 2.8 you need 60's
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Old 07-07-2009, 11:31 AM   #13
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YOU DO NOT NEED 60S FOR A 2.8... christ people...

You SHOULD NOT run a 2.8 on the GM stage 2 tune, but if you have a custom tune, a 2.8 is JUST FINE...
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Old 07-07-2009, 03:05 PM   #14
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YOU DO NOT NEED 60S FOR A 2.8... christ people...

You SHOULD NOT run a 2.8 on the GM stage 2 tune, but if you have a custom tune, a 2.8 is JUST FINE...
see people like this are why this forum is sucky, i have hp tuner logs showing that the stage 2 42's will be at 101% idc, with a 2.9, at 7,000 rpms, meaning those injectors are maxed out on a 2.9. On a 2.8 the 42's will go static, im just really tired of arguing with people that dont know what there talking about
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Old 07-07-2009, 03:22 PM   #15
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Okay... *looks at my car*... I ran a 2.8 on 42s for 7 months... Hard... No problems... nothing went static.. MY logs showed idcs in the high 90s low 100's... But if you knew what was really important, youd know that you should be more worried with pulse width... My pw's were in line with not being catastrophic...

Did you look at the 2.8 on the gm tune? Or a custom tune?

I was custom tuned... Okay.. i was running a little lean.. But as long as you take care of the car, and not drive it like an idiot...

There have been people who ran a 2.8 on 42s for years...
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Old 07-07-2009, 03:26 PM   #16
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i wouldn't go below a 2.9 on a gm stg2 tune..

my idc's were 111 on a 2.9
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Old 07-07-2009, 03:27 PM   #17
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your totally right dude, you mod your way ill mod my way, but for anyone that wants to mod safely with no problems stay on 2.9 with the 42's you will have no issues beat on it as much as you want, its not worth the risk for the little gain
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Old 07-07-2009, 03:29 PM   #18
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BATTLE ROYAL... every car is diffrent, some ppl have run 2.8s on 42s and have had no problems, while others have had problems. me personally id rather be safe and am running a 2.9 0n 42s and would not go any lower. but thats just me. as for the post if he is stock he cannot just throw a 2.9 on, he would need injectors (either 42s or 60s) shortened belt (and or tensioner) and a tune.

/thread
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Old 07-07-2009, 03:32 PM   #19
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but if you have meth than you idc wont be so high. so you can run a 2.8 on 42 all day long.

and get a custom tune. not a gmstage 2 tune.

Last edited by stenguyen1; 07-07-2009 at 03:32 PM. Reason: Automerged Doublepost
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Old 07-07-2009, 04:03 PM   #20
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your totally right dude, you mod your way ill mod my way, but for anyone that wants to mod safely with no problems stay on 2.9 with the 42's you will have no issues beat on it as much as you want, its not worth the risk for the little gain
We'll agree to disagree, then ...

Thank you for not fighting over it... sometimes people dont like opinions enough to even bother with them.
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Old 07-07-2009, 10:00 PM   #21
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if i had a 2.9 pulley and 60 lb injectors and a custom tune would i be ok ? what kind of power output could i see ?
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Old 07-08-2009, 12:27 AM   #22
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if i had a 2.9 pulley and 60 lb injectors and a custom tune would i be ok ? what kind of power output could i see ?
And a belt tensioner or stage 2 belt and than you would be ok. But if you plan on sticking with the 2.9 than you mind as well get 42's but if you want to go any lower in the future like to a 2.8 or lower than it would be smart to get 60's. It would also be smart to get cooling mods on anything below 2.9. But yea. You could do 2.9 on 60's. Just need a custom tune.
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Old 07-08-2009, 05:27 PM   #23
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Find a custom tuner!!!!
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Old 07-08-2009, 05:46 PM   #24
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Dont waste your time on 42s, get 60s, buy injectors once and then later down the road if you want to do a 2.8 or 2.7 youll be all set already. and deff get a custom tune and maybe dual pass or H/E. The last two arent needed, but good insurance
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Old 07-22-2009, 05:11 PM   #25
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would i need stage 2 belt and larger tensioner pulley, can i put both or would the belt be way too tight to put on?
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