Hi Guys,

 

Bit of advice would be nice...

 

I was driving my 300TT manual yesterday...after about 15 minutes of driving i was going down a hill and nailed the throttle in 2nd.

 

At 7/7500 rpm the rev limiter cut in, but it cut in a lot harder than it has done before - it was almost as though some one had put put the brakes on...

 

It was fine as soon as the limiter had cut in, running as usual. It gave me a bit of a fright though.

 

The car has been fine ever since - no smoke, no funny noises, running exactly the same. What was it? Has anyone else experienced this? Someone's told me it could just be the car giving me a 'slap on the wrist' cos the turbos hadn't been used much on that run?

 

Any Ideas?

 

Thanks

 

Eddy

No these cars don't give you a slap on the wrist lol. It was probably just due to the fact you were going downhill to be honest.

 

CheerZ,

 

Andy

Cheers Andy - glad it aint serious ;-)

 

So why would this happen downhill then? do you know the mechanics behind it?

 

Cheers

I think it is because of this:

 

Normally, when you hit the rev limitter, the friction of the car, drag etc causes you to lose speed fairly rapidly as the power cuts. When you are going downhill, the car is more balanced in terms of forces so doesn't slow down as quickly. Because the engine revs don't drop the limitter stays on - giving the feeling of holding back quite hard. Because the car is pointing downhill you will be 'tipped forwards' making the decelaeration seem even greater.

 

Does this make sense? No not really LOL

 

CheerZ,

 

Andy

Ed,

This happened to me at around 140mph once, very very sharp decelleration, kind of like braking hard.

 

Very alarming but perfectly normal.

 

 

and very annoying when you're halfway past a Rover !

Or it could be the vacume from the engine. Like when you go from 4th to 2nd the gears slow you down. You where going at a speed that needed probably 8000rpm to hold but the rev limiter kicked in and kept dropping it to 7000rpm causing the same effect of having it in a too low gear, which you was really