I wonder how much the cluster is off (under or over) from actual boost as well as what kind of delay is in the signal to the cluster. I wouldnt think its the most accurate thing. A mechanical boost gauge hooked up to measure this is probably the best for accuracy. Anyone done this and if so what where the results?

 

I was at Summit Pt. over the weekend and on sunday (dry and 54 or so), I was pushing .8 bar consitantly...I was a little scared as Im ALL stock short of exhaust...I think my car was a wednesday car...

 

With stock exhaust I run 0.6 consistant and saw 0.7 maybe once.

With hollowed out X-50 exhaust I ran 0.7 consistant with 0.8 blips

With the Fabspeed SuperSport it fluctuated between 0.6 and 0.7, never saw 0.8.......I just couldn't put enough gas through the larger pipes with puny k-16s.......But oh that sound

 

Im running straight through...maybe thats why...

 

Had the same question last week. Totally stock I get 0.7 bar. Time for software!

 

How do you figure out pounds of boost vs BAR? I know 1 bar with larger turbos is more boost then with say k16's. So how much boost am I making at 1.1bar with k16's?

 

The value of 1 bar is a close approximation to atmospheric pressure and is often used to represent atmospheric pressure rather than standard atmosphere (101325 Pascals).
1 bar = 14.503861 lb/sq. inch


It doesn't matter what makes it...

Power may change with bigger turbos, but boost is boost.

 

Question for the group that seems to belong in this thread: I just picked up my 996TTS cab today, so I am very new at this. I was hard on the throttle with my supposedly upgraded turbos, exhaust, flash, diverter valves, cross plenum, etc. I never saw the boost go above 0.5 bar. Does that seem odd? This was on the freeway doing 80 or so in 3rd.

 

Not above 0.5 bar? your car is in safety mode,you could try to unhook the battery for 2 minutes and try again,if you think your car is making power you will be suprised how much power it makes whan you see 1 bar.If your car goes in safety mode again,something will be wrong..

 

To see full boost ,you should drive in 4 or 5 gear at 3000 rpm and hit full throttle,you should see with a flashed car at least 1 bar..

 

Yes, something may be wrong. If you bring the car to Irvine, I will take a look at it for you. I have the same car as yours. You can see 1.0 bar as early as second gear.

 

i will try this on the way to work this morning and let you all know what happens. I really hope I am in safety mode!

 

Just some language modification...to see your true "sustained boost" you need to pull (WOT) in third or fourth. You will likely see spikes in any of the lower gears. What bar your reach depends on a number of things...your hardware, your flash and environmental conditions.

If you are topping out at .5 bar your car is in "limp" mode. Disconnecting the battery is one way to "reset" the ECU, but you really should get the codes read....there may be other problems (e.g., leaks, MAF)

 

i have a stock 996tt with diverter valves and K&N. I see peaks to 0.7 once in a while.

 

with my 996TT, i hit .9 bar while WOT from 3rd gear at 60mph through right before the shift to 4th. I don't know if it was "sustained" or not because I was concentrating on not rear ending the cars i was coming up so fast on... but when I looked down real quick I saw .9bar.

I only have a K&N filter installed.