live2shift

Please pardon my newbyish question, but how much boost should I get under full acceleration? My 01 TT has a brand new factory installed engine/turbos, just broken in with around 3k miles and only seems to hit a max of 0.6 bar. Is this what it should be??

Cueto

I get .7 most of the time.
Remember ki live inan island with a lot of heat,humidity and at sea level.

good luck.

Cueto

tkerrmd

Stock TT's should hit around 0.7 and X-50's up to 0.9 and ECU remaps 1.0+. Also your digital guage is very slow and inaccurate. And ambient conditions cause a lot of variation as well.

Pierre

My '01 TT showed up to 0.9 bar under very heavy load, 0.7 under 'normal' conditions.

Cueto

would u be so kind as to tell us why did u need a new engine?

rajtt

0.6 bar seems rather low but it is influenced by ambient conditions and fuel octane. Where available you should use 93 octane if you aren't already. You should be hitting 0.8 bar in the higher gears under full load under optimal conditions.

Dock

I think 0.8 bar is a little high. Here's the boost graph...

live2shift

Can you interpret the graph please.

dhud

0.8 is top boost on standard TT. 0.9 is top boost on X50. If ECU reads problem, boost is limited to 0.5 to protect turbos. Find a long steep hill and while ascending it in second or third gear floor it and carry it to redline. If all is normal you will probably see 0.8 bar. Mine is X50 and chipped. In these conditions I hit 1.2 bar.

Dock

The graph is from Porsche for a base 996 Turbo. The graph shows rpm in the horizontal, and hectopascals (h Pa) in the vertical. The graph also shows horsepower and torque. The shaded area on the bottom of the graph is the boost curve (in H Pa) based on rpm. The boost starts at ~1013 h Pa on the left at zero rpm because this is ambient pressure at sea level on a standard day...1013 h Pa/14.7 psi/1 bar. The boost peaks at ~1750 h Pa at 2500 rpm, or just over 0.7 bar above atmosphere (1750 minus 1013). This 0.7 bar is what you would read on the boost gauge. Boost then drops as rpm increases, and averages ~610 h Pa through redline...or about 0.6 bar as read on the boost gauge. This is in theory what the car is supposed to do in terms of boost; however, the system, measuring devices, and displays all combine in their inaccuracies and the actual reading in the cockpit may not match this factory graph...but all things operating 100% accurate, this is what you would read.

alevine

I was sustaining .6 bar (and peaking .7 bar) an my stock '01 TT before I purchased Kevin's flash program.

Adam

live2shift

Thanks Dock

Pierre

0.8 = top-boost on std TT? I've seen 0.9, see this pic. Yes, the car was plain stock at that time.


Cueto, all details about my engine swap here: https://rennlist.com/forums/996-turbo-forum/222023-went-for-a-new-clutch.html

wross996tt

As always there are variables that will effect what the boost gage displays...environmental conditions, altitude..oh yeah and measurement error. When talking about what you should expect to see, most people are talking "averages" (actually average peak). This does not mean that single points can't exceed the "average". Even the Porsche graph does not account for variation which exists in everything!

Woodster

PSI 480 == 1.0 bar and very nice torque curve with K-16's