i have an 06 ss. engine mods are front mount h/e, #60 injectors, duel pass is going in this weekend, 2.6 pully, k&n cai, vibrant header with catless downpipe, magnaflow cat back.
supercharger has only 3,000 miles on it. its a rebuilt from superchargers usa


i only get about 12 psi. it will hit 15psi right before redline. i live in mn, low elevation, its been about 60 - 70 degrees out. does this sound normal to you guys seems low to me

 

even with the old supercharger it was the same. when it was winter abut 10 degrees out it would hit 17 psi

 

First off are you tuned, second thing is if your tuned who did the tuning. Also is your ic pump working if not your iat2s can get high enough where it will limit your boost which could be a cause. Another thing is your boost gauge can be bad, or you could have a boost leak.!!!!

 

2.6 you should be hitting around 19-20 psi....have you checked for any vacuum leaks?

 

Hey sean stfu your retarted. lmfao im jk............ And OP depends on your supporting mods, like exaust and ect on how much boost you will run along with elevation and engine helth!

 

Awe thanks buddy for showing your support hahahaha

 

Do the boost bypass mod. Almost guarantee you'll hold 19 psi all day after you do. If thats the case then your getting too hot and your car is pulling boost/timing. If so fix whatever is wrong get a better tune and have some fun. Doubt he has vacuum trouble or he would be complaining about idle and or cel's.

 

U sure about your comment of vacuum... If he had a vacuum leak and was tuned with it it wouldn't. Be very noticeable. Cel could be taken care of by turning the cel. Off.. Op don't pass what i said up i didn't go to college for auto engineering for nothing......... OTE=terry11;5853065]Do the boost bypass mod. Almost guarantee you'll hold 19 psi all day after you do. If thats the case then your getting too hot and your car is pulling boost/timing. If so fix whatever is wrong get a better tune and have some fun. Doubt he has vacuum trouble or he would be complaining about idle and or cel's.[/QUOTE]

 

Might as well get the smoke machine out then

 

U sure r funny Bro... Here i am helping a fellow cobalt owner and u have to make jokes on something i say. Kinda rude dontcha. Think......

 

the car has 18 inches of vacume. no vacume leak. it has a stage 3 zzp tune. i can check my IAT with the tech 2 but the car has low boost still before it gets up to temp. acts like a boost leak but im used to turbos ths is my first supercharged car and dont realy understand how you could do a boost leak test. i ordered all new GM gaskets for the duel pass install but im sure it wont fix it.

 

ic pump is working

 

ill try the baypass mod quick and see if anything happens

 

I say get a real tune....

 

did the bypass mod, no changes still has the same concern. will a tune realy cause my low boost problem?

 

A canned tune can cause alot of problems

 

Yes a tune can cause a lot of crap.... Take the supercharger off and verify the s.c bypbass butterfly is not stuck open. if good, id start checking your gauge and see if your engine is healthy

 

bypass valve was replaced with a new one and adjusted correctly when the supercharger was changed. ill check the gauge and ill check compression and see what she what i get do you guys know what compression should be around on these lsj's

 

compression test. cyl 1.- 190 psi cyl 2.- 195 psi cyl 3.- 193 psi cyl 4. 190 psi
alos double checked the bypass valve. its working correctly and is adjusted right

has anyone else seen a tune cause low boost? the plugs are nice and brown.

 

Yes I've seen tunes cause low boost. High iat2s do it. If u have cot enabled and ect...

 

whats cot mean ect you mean engine coolant temps right

 

im going to have the car tuned. im going to drive to minneapolis and have it done. i was thinking of ordering a 2.7 pully for it instead of the 2.6 ive herd the 2.6 realy doesnt give you much for gains and realy hurts the life of the blower, but i just dont want to tune it and still end up having low boost. i would have all this time and money into tuning it for nothing.

 

Convertor over temperature. Basically dumps fuel to cool it.

 

And it limits boost as well.... Tq management tables is prob Ure issue...

 

so a tune will get rid of the cot. it is catless. no cel