Too much boost
#1
New Member
Thread Starter
Join Date: 01-25-06
Location: dearborn, MI
Posts: 145
Likes: 0
Received 0 Likes
on
0 Posts
Too much boost
I'm hitting close to 20 pounds of boost on my 2.8 stage 2 set up. I have full exhaust and intake. i was getting over boost when i still had factory dp on. Now i have the xtc high flow and i just finished the break in period and still the same thing. What would cause this?
#4
Senior Member
Join Date: 01-15-05
Location: Ottawa
Posts: 5,126
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by fWdCoBaLt
I'm hitting close to 20 pounds of boost on my 2.8 stage 2 set up. I have full exhaust and intake. i was getting over boost when i still had factory dp on. Now i have the xtc high flow and i just finished the break in period and still the same thing. What would cause this?
#6
Senior Member
Join Date: 01-15-05
Location: Ottawa
Posts: 5,126
Likes: 0
Received 0 Likes
on
0 Posts
not sure because a 2.8 does not over spin the SC. A 2.9" pully at 7000Rpm should give you less then 14,500Rpm at the suppercharger. Its red line is 16,000Rpm from what I have been able to find. A 2.7" pully at 7000Rpm should give you BOUT 15,555Rpm at the supercharger.
I think im going to swap out my stock PSI guage, see if that does anything.
I think im going to swap out my stock PSI guage, see if that does anything.
#9
New Member
Thread Starter
Join Date: 01-25-06
Location: dearborn, MI
Posts: 145
Likes: 0
Received 0 Likes
on
0 Posts
let me know if the guage does anything for you. but the cold whether makes sense. Anyone know of a heated track? this way low temps and sticky tires
#11
Senior Member
Join Date: 06-04-05
Location: LongIsland
Posts: 2,040
Likes: 0
Received 0 Likes
on
0 Posts
my guess is that one of your rocker arms broke so that valve aint working. as you go through the gear over boost gets worse right? Thats what happened to me no codes no nothing. Finally like 6 months later the whole valve train went 2000 miles before my warrenty ended. happened to a couple of redline guess too. Thats why GM revised the rocker arms for the 07's they new the 05, 06 ones were garbage.
#13
New Member
Thread Starter
Join Date: 01-25-06
Location: dearborn, MI
Posts: 145
Likes: 0
Received 0 Likes
on
0 Posts
So should i put stage 2 pulley back on? keep an eye on it and if it persists take it to the dealer? Will the 07 parts go in here? I really don't race thing i just get on the car on the free way so it really hasnt been ragged on... The way the boost works right now is i will get to my 17.5 than all of sudden it just starts creeping its way up.
#15
Senior Member
Join Date: 08-05-06
Location: Moncton canada
Posts: 1,656
Likes: 0
Received 0 Likes
on
0 Posts
Actually i have that two. I will go WOT and in the first gears it stays low, but like 3-4 gear it goes unusally high. I just thought it was air being able to go in the motor faster cuz the motor makes the supercharge spin faster???
Thread
Thread Starter
Forum
Replies
Last Post