MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: berg on April 12, 2011, 09:10:32 am

Title: Is it harmful for the engine to let the rev limiter kick in?
Post by: berg on April 12, 2011, 09:10:32 am
I dont often get chance to nail my car but after having the valve spring float CEL issue after Revo Stg1 I occasionally "red line" the car to see if the engine light comes on - all good so far.

On my old MK 3 Gti if you red lined it you could tell that the engine was most displeased with you for giving it such stick but with the MK 5 it is almost "gentle" and the limiter kicks in to tell you to change up a gear. Is the engine designed to rev so highly without any damage providing you are not going it from cold or is it technically still best to change up after say 5500 rpm as the peak power/torque curve will have been delivered by that point?

Ta
Title: Re: Is it harmful for the engine to let the rev limiter kick in?
Post by: Nasir on April 12, 2011, 09:18:10 am
You always want to stay in the powerband but I wouldn't worry about hitting the limiter. After all that's why it's there and it is a GTI so it wasn't designed not to rev high.
Title: Re: Is it harmful for the engine to let the rev limiter kick in?
Post by: PDT on April 12, 2011, 11:16:41 am
its not a great idea to bounce the engine on the limiter, but most modern cars have a soft cut limiter so that the engine just seems to stop revving rather than a hard cut limiter that does this:


but theres no reason whatsoever to need to rev the engine past the peak power point which is usually way before the rev limiter.
Title: Re: Is it harmful for the engine to let the rev limiter kick in?
Post by: berg on April 12, 2011, 01:01:08 pm
its not a great idea to bounce the engine on the limiter, but most modern cars have a soft cut limiter so that the engine just seems to stop revving rather than a hard cut limiter that does this:


but theres no reason whatsoever to need to rev the engine past the peak power point which is usually way before the rev limiter.


cheers dave, so even for "spirited" driving through the gears best to change up after 5-5.5 rpm. Tbh, with Revo on the Eddie you run out of road before you can get through the gears in that fashion anyway  :driver:
Title: Re: Is it harmful for the engine to let the rev limiter kick in?
Post by: bacillus on April 12, 2011, 02:13:36 pm
With dsg in S mode the change up can be as high as 7k rpm...   :smiley:
Title: Re: Is it harmful for the engine to let the rev limiter kick in?
Post by: alexperkins on April 12, 2011, 02:18:00 pm
S mode is silly though as the power is gone before 7k  :signLOL: M is the way forward
Title: Re: Is it harmful for the engine to let the rev limiter kick in?
Post by: patrickcullen87 on April 14, 2011, 07:36:21 am
out of curiosity what is the power band on a remapped gti??  :smiley: