Stock SC Boost question
#1
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Stock SC Boost question
I have stock pulley and etc. on the Cobalt.
What's the boost at on the stock pulley?
I've heard 12.5 or something along those lines.
Is this the MAX boost possible on the stock pulley, or is the BPV bleeding some off? I want to tune for some 42s but I'm not going to waste my time if I can't generate more boost.
And FYI, no recommendations to get a smaller pulley. Pulley size will change my class in AutoX and I'm not trying to race in street mod.
What's the boost at on the stock pulley?
I've heard 12.5 or something along those lines.
Is this the MAX boost possible on the stock pulley, or is the BPV bleeding some off? I want to tune for some 42s but I'm not going to waste my time if I can't generate more boost.
And FYI, no recommendations to get a smaller pulley. Pulley size will change my class in AutoX and I'm not trying to race in street mod.
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many things affect boost, more boost doesn't necessarily mean more power.
and to answer the OP's question: pretty sure the biggest injectors you wanna run on stock pulley is 39#, and this will give you more power. but i don't think it increases your boost
and to answer the OP's question: pretty sure the biggest injectors you wanna run on stock pulley is 39#, and this will give you more power. but i don't think it increases your boost
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Does it run about 12psi or is possible to over that amount? I'm clueless to if the BPV is bleeding it. =(
I know this, but in order to get more power out of 42# injectors with out changing pulley sizes, you need to be able to create more boost.
I know this, but in order to get more power out of 42# injectors with out changing pulley sizes, you need to be able to create more boost.
Last edited by Lifter; 11-03-2010 at 06:30 PM. Reason: Automerged Doublepost
#11
i've heard 12 or 13 for stock boost. but i've had a couple ppl tell me they've seen my car hit 14 or 15lbs on a night with a good low air temp. i've also noticed during colder nights in the summer or fall nights when i go out with friends it pushes more towards 13.5lbs. call me crazy but just saying what i've seen happen in my car.
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At this level of boost, does it max out stock injectors?
If so, at 12.5, I might as well increase airflow. I.E. Non-restrictive filter, ported charger, wider TB, ported intake mani, etc.
If so, at 12.5, I might as well increase airflow. I.E. Non-restrictive filter, ported charger, wider TB, ported intake mani, etc.
#15
Don't port anything, you'll just ruin it. If anything have the head professionally ported.
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Looking at less inexpensive options. Ported head is way too much work and will put me with out a car.
Porting either of those will not be detrimental if tuned correctly, and ported correctly.
Porting either of those will not be detrimental if tuned correctly, and ported correctly.
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Exhaust is a given. I have a set of 42's, and was looking to use them in some way.
I can't even have a CAI or I get bumped =(
#23
I'm sure you can get some 42lb/hr injectors w/ a custom tune, and be fine for your AutoX class. GMS1 is 42lb/hr injectors, and the same tune as GMS2. You may want to look into that if you want to bump up the power a bit w/o messing with pulleys.
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And I already have a set of 42s, just looking to see what the best route would be in trying to make them useful.
You can only swap air filters with the airbox. You cannot change it in any way.
About the crank pulley, I'm not sure. I'd have to check. Didn't really think of that.