loosing boost!
#1
loosing boost!
hello, i have an issue which am loosing boost at around 5500 rpms to shifting time, from 16-17 psi down to about 11 psi. does anyone know why this might be happening??
year :2006
cobalt ss s/c
yellow
Mods: 779 pulley, stage 2 belt, cold air intake, heat exchanger. no injector upgrade yet.
year :2006
cobalt ss s/c
yellow
Mods: 779 pulley, stage 2 belt, cold air intake, heat exchanger. no injector upgrade yet.
Last edited by jonathan923; 01-27-2009 at 11:07 AM.
#2
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Join Date: 08-14-06
Location: Spring Hill, Tennessee
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What size pulley?
Are you using the stage 2 belt? It's possible you're belt is slipping over the supercharger pulley causing it to not spin fast enough. Hence the loss of boost pressure.
Are you using the stage 2 belt? It's possible you're belt is slipping over the supercharger pulley causing it to not spin fast enough. Hence the loss of boost pressure.
#4
..
hey guys yea I was in his car the other day and around 5500 it drops from full boost(16) to about (10-11) n just stays there n when u shift gear, it gets full boost again n then drops again. He does have the stage 2 belt on it
#12
as far as the high boost #'s, could be a clogged cat, or if he's running on stock exhaust that will give him higher boost #'s.
#16
.
Nuthin is gonna happen to his car becuz I been running my car with 42 lb injectors on gm tune n a 2.7 pulleys n nitrous for about 2 years almost n my car runs fine n hard and I race my car like almost everyday.
#18
Senior Member
yeah thats cool. tell that to my motor that just popped thats tuned and has proper injectors.
thats just stupid dude im sorry, it just is theres no other way to say it.
thats just stupid dude im sorry, it just is theres no other way to say it.
#21
Senior Member
Wow... just wow. You shouldn't be modding your car if you don't understand the basics of a gasoline engine. Let me put it this way.
AIR + FUEL = GO
AIR + NO FUEL = A tow truck dragging your car to the shop.
Get 42s or 60s, and a proper tune. Don't be ******* cheap.. You either do it right and pay a bit more, or you cheap out now and you pay a LOT MORE for it later.
Those injectors you have in there are maxed out way before you hit 5500... you're just killing that engine.
AIR + FUEL = GO
AIR + NO FUEL = A tow truck dragging your car to the shop.
Get 42s or 60s, and a proper tune. Don't be ******* cheap.. You either do it right and pay a bit more, or you cheap out now and you pay a LOT MORE for it later.
Those injectors you have in there are maxed out way before you hit 5500... you're just killing that engine.
#22
at least you have bigger injectors and a tune. your probably doing damage to your car as well, but not as much as your friend. but if you think it's safe to run a 2.7 and nitrous on 42# injectors and nitrous, you really, really need to do more research. your car is most likely not in as good condition as you think.
#23
am getting the injectors this weekend. so u people think thats the problem...well thankfully nothing has happened to it cuz i dnt run it as much but ive had it that way for about a year n nothing has gone wrong with it but thanks for all the comments anyways... any other suggestions???
#25
am getting the injectors this weekend. so u people think thats the problem...well thankfully nothing has happened to it cuz i dnt run it as much but ive had it that way for about a year n nothing has gone wrong with it but thanks for all the comments anyways... any other suggestions???
bad, bad idea. Honestly I would stop driving the car. and your friend too, with the 2.7 & nitrous on a stage tune.