Throttle response from 3K! Ouch!

[jaykay]

I did some testing with fellow forum member Heiko and his new 74mm throttle body. His car (same as mine 2000 S) is really quick and accelerates amazingly well! Well I now know what I have been missing with the 74mm. The time in his car really accentuated the throttle response issue that I am having.

In 3 or 4th gear at 3K it seems like it can take up to 3-5seconds to get over 4K! At 4.5K things wake up and seems fine but it is all too late! At 3K, I would look over at H and say I am “flat” (pedal to the floor board) here… and his reaction would usually be dismay…

Could my used TB be defective? Is there a vario-cam problem? Is there an intake or exhaust acoustic problem?

Heiko’s car is pretty much stock with the exception of the TB and intake plumbing for it. The plumbing is potentially “smoother”. His engine is better maintained..

Mine is modified much more:
short snorkel
rougher prototype intake tube for the 74mm TB; 3.25” dia. rather than 3”
secondary cat by-pass pipes
stock S by-pass muffler (worse flow?)
softronic tune
leaky spark plug tubes/older plugs
older air filter
5w40 oil….heavier

I am wondering if the stock tune works better with the characteristics of the 74mm TB. Any thoughts?