2BAD4U

iTrader: (1)

As stated turned up boost from 15psi to 20psi only saw 30whp. What could be problem. Left tune the same... Doesn't seem to be blowing out spark because car is not cutting out and graph looks good. I don't think it's back pressure... I run 4" dump about 12" out turbo and that's it! HELP!!!

buick_lsx

Running into back pressure
Iat's going up robbing power

denmah

iTrader: (2)

yeah when your hp per LB drops off like that you might be loosing alot of power from your IAT vs spark table, if you are running a stock computer, also you could be out of turbo.

or both.

Sweet_SS

Another thing to consider is an boost leak or knock. If your getting knock that will pull timing and also kill power. As stated above, depending the on size of your motor and turbo, it could be out of turbo as well.

skinnies

iTrader: (33)

valve springs is what my issue was going from 18lbs to 24lbs didnt make much difference.

denmah

iTrader: (2)

valvesprings also, also tune could be rich on higher boost.

looooots of things!

stock48

iTrader: (17)

Could be all of the above and altitude if you over 4000'

pwrtrip75

iTrader: (8)

Need all the specs before even guessing. What turbo? What Trans? clutch? converter? cam? valve springs? ....etc.

stevieturbo

So you add 5psi boost and left the tune the same and wonder why it didnt make power ?

If you turn the boost up, you MUST retune for that pressure/airflow.

And a lot will also depend on setup, turbo size etc. More boost does not always = more power.

HydroStream6

iTrader: (16)

Yea we're missing like 23423401287 details here...

CI, turbo, cam, springs, fuel, AFR, etc, etc, etc

2BAD4U

iTrader: (1)

IAT 80 degrees... good size turbo... ???? Blowing out spark???? gapped at .035 17-20psi

2BAD4U

iTrader: (1)

No KR.... Good fuel 17* timing

2BAD4U

iTrader: (1)

Awe.... Ha!!! Might be the issue... i think they were the beehive 650 lift springs. Not sure on spring pressure rate though. Tu2 cam harland sharp 1.7 rockers!

Nitroused383

iTrader: (10)

Put the stock rockers back on.

Old Geezer

iTrader: (3)

Data logs????

turbocamaro125

iTrader: (3)

what size is the turbo?

2BAD4U

iTrader: (1)

You really think so? You think they are to heavy?

2BAD4U

iTrader: (1)

You know I'm not sure if we saved them. Ill see.

dschmittie1

iTrader: (64)

If your saying you have a single behive spring and running a heavy rocker then yes either put stockers back on or put some better springs in it. Or even do both

js2fst

iTrader: (12)

Bov bleeding due to lack of vacum