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Is there something wrong with my boost levels?

alpha

By alpha
in 996 TT, 996 TT S, 996 GT2

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alpha Member

alpha

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Posted

I have an '01 996tt Tip, and I've been considering getting an ECU flash, so I've been trying to learn what I can. I recall reading somewhere that for the non-X50 996tt, I should see transient peak boost at 0.8 bar, and sustained boost at 0.6 bar (under load). So I set out to see what my peak boost is by going to manual mode in 4th gear on a 20% upgrade hill and going WOT at 45mph. I saw 1.0 bar for just a moment, then it went down to 0.8 bar until I slowed down (about 80mph). When I did the same thing in 5th gear, I saw 0.8 bar for a brief moment, then it went to 0.6 bar and stayed there. From what I understand, this doesn't seem right (the 1.0 bar).

The car runs fine, no CELs, no strange sounds. I bought it 10/05 as a CPO from a dealer in IL, and I believe it is completely stock (original FR5 spark plugs and stock DV's). It feels a bit "laggy" at low rpms, but I think it might just be the higher gearing of the 5-sp Tip. I don't feel the boost really come on until about 3,500-4,000 rpms.

So ... is this normal? Or does it sound like someting is not quite right, and what might it be? I would appreciate any help. Thanks.

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Beecher Member

Beecher

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I have an 03 TT with 6spd. I observed pretty much the same numbers that you did. I got a GIAC flash for the computer and it made a huge difference. I strongly recommend the flash. I see a steady 1.1 bars of boost with a wonderful roaring sound from the intake. It feels like 70 more hp to me. I had to learn how to use the throttle all over again. Good Luck.

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alpha Member

alpha

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I have an 03 TT with 6spd. I observed pretty much the same numbers that you did. I got a GIAC flash for the computer and it made a huge difference. I strongly recommend the flash. I see a steady 1.1 bars of boost with a wonderful roaring sound from the intake. It feels like 70 more hp to me. I had to learn how to use the throttle all over again. Good Luck.

Thanks Beecher -- I'm thinking about doing the GIAC flash in the future, but I need to get new FR6 spark plugs and new diverter valves first.

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