Static Rev Test Results

[mrlapou]

No idea if this is a test which means anything, so bear with me.

Since from when a pipe (not sure which, as stealer fixed under warranty) blew off in engine bay, the car seems to be suffering from what appears to be like throttle lag. Seems to be a slight 1 second response to throttle inputs Also down shifting in DSG tip mode, the engine / gear change baulks. Taken it in twice now, but stealer says it fine..

Today I tried this against a MK2,  2.0T Audi TT with DSG. Both engines warmed up & are stock with no mods.
From idle (box in Park) , as fast I could, blipped throttle to WOT then released immediately. Did this a few times.

Results:

TT (1.5k miles on clock) : rev up to about 2850 rpm.
GTi (21.5k miles on clock, new Plugs, PCV, DV, Air Filter, oil changed 2k miles ago) rev up to 2100 rpm.

Any thoughts?

Could you check your car, see how it relates to my GTi results.

Tks

[WhiteGTI]

No idea if this is a test which means anything, so bear with me.

Since from when a pipe (not sure which, as stealer fixed under warranty) blew off in engine bay, the car seems to be suffering from what appears to be like throttle lag. Seems to be a slight 1 second response to throttle inputs Also down shifting in DSG tip mode, the engine / gear change baulks. Taken it in twice now, but stealer says it fine..

Today I tried this against a MK2,  2.0T Audi TT with DSG. Both engines warmed up & are stock with no mods.
From idle (box in Park) , as fast I could, blipped throttle to WOT then released immediately. Did this a few times.

Results:

TT (1.5k miles on clock) : rev up to about 2850 rpm.
GTi (21.5k miles on clock, new Plugs, PCV, DV, Air Filter, oil changed 2k miles ago) rev up to 2100 rpm.

Any thoughts?

Could you check your car, see how it relates to my GTi results.

Tks

What does "WOT" mean?

[topher]

Wide Open Throttle

i.e pedal mashed to the floor

[Teutonic_Tamer]

Please do NOT try this - unless you want to fcuk your turbo! 

Revving an engine under "no load" conditions creates aggravated wear, both on the piston, and in the valve train - considerably more so than under load. 

Furthermore, blipping, or reving the throttle on a turbo engine is a sure-fire way to dramatically reduce the life of the turbo.  Whilst the engine revs may rapidly drop to tick-over speed when you close the throttle, the turbo will still be spining at around 180,000 rpm (and that is NOT a typo), with very little oil flow through its' bearings. 

The reason that the GTI and TT can not rev beyond 3,000rpm under no load is simply because VW/Audi specifically programme their ECUs to prevent such stupid behaviour. 

I noticed this very same question was posted over on ukmkivs, where you will know-doubt get a completely different answer from their resident bully/net-nanny - who is expert in . . . . . er . . . . . IT.    For once, trust the stealer, because they are exactly correct.   

[Cass]

Classic response TT - I was waiting for this

Cass

[R32UK]

Well you learn something every day

Didnt know that was the case with turbo cars... so I guess sitting at the lights in launch control mode is probably no good for them either?

[Teutonic_Tamer]

Didnt know that was the case with turbo cars... so I guess sitting at the lights in launch control mode is probably no good for them either?

Not really a problem, because (a) the revs are held at a constant speed, and (b) the revs are limited by the ECU to a safe level. 

[mrlapou]

Sorry to spoil the party but both the GTi and TT will happly rev up to red line under no load i.e DSG in P.

[Teutonic_Tamer]

Sorry to spoil the party but both the GTi and TT will happly rev up to red line under no load i.e DSG in P.

Really! 

Well you carry on f**king up engines and turbos, but please don't encourage others to do so, and please, when you come to sell your car, advise new owners of how you treated it. 

[topher]

The OP isn't trying to rev the nuts off his engine, he's just concerned that the throttle response isn't what it should be and is testing by comparing a short 'foot to the floor' blip against another car... during which short time it wont over-rev anyway. Not the most scientific test but a decent benchmark nonetheless.. and with a 750rpm difference I'd say there's something not quite right there.
In days gone by disconnecting the battery for a while caused the throttle body alignment to reset.. not sure if that applies to anything after the MK4 though.