Acceleration times Boxster S

[mattatk]

G'day All,

Been doing the 0-100km/h run in my 2001 Boxster S (manual) recently & she struggles in at 6.9seconds. The book figures (depending on the book) state 5.9 s & two years ago I managed to pull off a 5.4s.

My question is drawing a long bow, what do you think could be causing this slight lack of acceleration?

Some history:

1. Changed the clutch last year (but didn't change the flywheel, although it had a few hot spots).

2. Changed the AOS after a bit of smoking, had to clean throttle body & wipe out oil from plenum chambers.

3. Tires are getting a little old (although there was virtually no wheel spin in test takeoff).

4. Regular oil changes with Mobil1 (mix of 0W-40 & 5W-50).

5. Use Shell V Power (98 octane).

My only guess is that the problem lies in the flywheel, as on the initial takeoff, the car appears to lurch forward, pause for a millisecond & then continue with the acceleration.

Any thoughts?

Thanks in advance,

matt

[pk2]

How many miles? Compression check? Leak down?

Regards, PK

[logray]

When was the last time you cleaned the throttle body?

Also if you are doing a comp and leakdown test might as well replace the plugs.

[mattatk]

Logray,

The throttle body was cleaned a few days ago.

pk2 & Logray,

Yes I was thinking about the spark plugs & will change them on the next opportunity. I don't have the compression testing equipment, but will look into it. Thanks & I'll post an update for anyone interested.

Cheers,

Matt

[logray]

Ever use fuel additive like Techron?, I see though you use 98 octane so maybe not as much of a help as us poor souls in the USA with at best 91 octane.

When you changed the flywheel did you test it per the TSB to see if it sprung back as it is supposed to?

Edited August 31, 2011 by logray

[mattatk]

Yes, I carried out the flywheel test as per TSB, it passed, although it didn't quite spring right back to the original position. I probably stuffed up by VERY lightly removing the disc surface hot spots.

As for the fuel additives, Shell quote that V Power fuel has engine cleaning additives already (it's bloody expensive fuel!).