surging

[diamondotg]

when i have it to the floor it kind of feels like im getting on and off the throttle. im running 18lbs boost everything stock exept whats in my sig scanmaster readings all within normal range per tt chip instruction sheet o2mv 780 car also has a stumble off idle

 

[turbo nasty]

Whats your TPS at idle and WOT. ALso MAF counts?

 

[diamondotg]

.48 idle 4.3 wot maf240ish

 

[TurboBuRick]

Maybe a bad cam or crank sensor.

 

[diamondotg]

wouldnt it throw a code if those were bad?

 

[TurboBuRick]

Not if it was a intermittent problem. Try unplugging the cam sensor while the car is running and go for a little ride. The ce light will come on but it will not hurt anything. See if you still have the condition.

 

[diamondotg]

ok i will try that out thanks for the help

 

[jdpolzin]

Are you running an electronic boost controller?

 

[diamondotg]

no just adjustible wastegate. so i took the car out today and the maf hits about 220 the falls to 204-205!!!! whats going on sounds low for 18lbs of boost HELP

 

[jdpolzin]

Do you happen to have a log file of the 18psi runs? I'd like to see the TPS to MAF readings and also Voltage to MAF charts.


Also, are you running the factory wastegate solenoid?

 

[diamondotg]

all i have is a scanmaster for tuning and yes i have a stock wastegate solenoid

 

[turbo nasty]

You still running the factory flex hose from teh MAF to Turbo?

 

[diamondotg]

yea im running the stock flex hose to the turbo i also have a 3 inch pipe running to a 14 inch k&n filter

 

[jdpolzin]

Tryo swapping the wastegate solenoid.