Amount of Boost in 1st - Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums
 
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post #1 of 9 (permalink) Old 02-07-2006, 08:19 PM Thread Starter
 
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Amount of Boost in 1st

I was just curious house much boost people were getting in first gear since mine seems to only go up to 5PSI in 1st but I'm getting up to 12 in other gears.
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post #2 of 9 (permalink) Old 02-07-2006, 08:33 PM
 
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I hit 15psi in every gear w/ a 3" pulley
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post #3 of 9 (permalink) Old 02-07-2006, 08:49 PM
 
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Quote:
Originally Posted by Chizzap30
I was just curious house much boost people were getting in first gear since mine seems to only go up to 5PSI in 1st but I'm getting up to 12 in other gears.
Boost is applied resistance or load. you get into a higher gear there is more load and then more psi is built up towards max pressure. It is possible to have less load in 1st than in 2nd and so on therefore less PSI. however 5 psi sounds low. I will test my car to see. 1st gear is so short that I dont usually look.
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post #4 of 9 (permalink) Old 02-07-2006, 09:20 PM
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Quote:
Boost is applied resistance or load. you get into a higher gear there is more load and then more psi is built up towards max pressure. It is possible to have less load in 1st than in 2nd and so on therefore less PSI. however 5 psi sounds low. I will test my car to see. 1st gear is so short that I dont usually look.
This is very true. Though you might not get the full 12 psi in first (and I'm assuming you've got the stock pulley), you should definitely get more than 5. 10 psi sounds about right.


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post #5 of 9 (permalink) Old 02-07-2006, 09:26 PM
 
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Quote:
Originally Posted by ssnipes
Boost is applied resistance or load. you get into a higher gear there is more load and then more psi is built up towards max pressure. It is possible to have less load in 1st than in 2nd and so on therefore less PSI. however 5 psi sounds low. I will test my car to see. 1st gear is so short that I dont usually look.
Very true, if you dont hook up through the whole gear your not going to see full boost. I didnt have a boost gauge until after I swapped the pulley so I dont know what the stock pulley would hit.
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post #6 of 9 (permalink) Old 02-08-2006, 03:23 PM
 
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I thought I had read that the ECM limits boost in 1st gear. I am pretty sure I hit 12 in first still, but it doesnt come on as soon as it does in other gears.
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post #7 of 9 (permalink) Old 02-08-2006, 05:17 PM
 
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I hit 18psi in first today racing a gtp. Gotta love cold dry air.
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post #8 of 9 (permalink) Old 02-08-2006, 06:54 PM
 
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i peg a 15 lbs in 1st and 15.5 in the rest of the gears
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post #9 of 9 (permalink) Old 02-21-2006, 08:40 PM Thread Starter
 
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well, I have to take my car up to the dealer for the Driver's Side door (see other post). So while I'm up there, I'll ask them about the boost.
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