Revo Judder?

Oct 12, 2005
1,013
0
Here it is guys. When i floor it in 2nd the car judders after around 3K revs and traction control light comes on and whole car vibrates.

Whats going on

Thanks
 

redcupratdi

Offical SCN Pole Dancer
Oct 13, 2005
755
0
cambridge
you going into a diesel state like wharp!

which if you are not careful will actually trun the earth!

and may result in you travelling forward or backawards in time (depending on direction of travel at given time ;)

be careful! take tcs off and do same thing! much better! hold on!
 

redcupratdi

Offical SCN Pole Dancer
Oct 13, 2005
755
0
cambridge
tcs system on diesels is different to petrol i think diesels can't cut power like they can on petrols ,

cos they can't cut fuel and control sparks.

hang on

unless it uses the "drive by wire" system to shut/control the thottle
 

DIFT

Torquing all the Torque
Oct 8, 2004
1,546
0
Kent/London
Diesel isnt drive by wire though is it?

I always thought it was the brakes.


I know the New (version) Elise cuts power, and was raved about as a sort of first :shrug:
 

redcupratdi

Offical SCN Pole Dancer
Oct 13, 2005
755
0
cambridge
it's crap on tthese cars whatever it is, so much more fun with it off.
no third party, sometime a little wheelspin is a good thing.
 

stoneyfordNI

GGG GGG GGGIGITYYY
Jan 9, 2005
2,673
1
Lisburn NI
from owners book

(cough , clears throat)

in vehicles with front wheel traction the TCS lowers the engine power to stop the wheels spinning when u accelerate , this feature works at any speed in combination with the ABS , if there is an ABS breakdown the TCS stops working,

but it also says cars with ABS also have an electronic differential lock EDL, and if one wheel out accelerates the other by more than 100rpm , the brakes are applied to that wheel supplying more torque to the grippier wheel , ummm

ESP seems to be similar but does not cut power , it uses wheel speed and yaw sensors to brake each indivudual wheel,

lesson over class
 

redcupratdi

Offical SCN Pole Dancer
Oct 13, 2005
755
0
cambridge
so when you launch and it's too much

the tcs tells the ecu to cut the thottle (stop accelarating)

also to brake the offending wheel to slow it down to correct speed.

must use both. and when going round corner and wheel spins up it use the brakes to deal with it.

then if you start going out of line (understeer) the ESp activates to putit on line.
 

stoneyfordNI

GGG GGG GGGIGITYYY
Jan 9, 2005
2,673
1
Lisburn NI
if you have ESP (no TCS or EDL i think) it brakes any wheels it needs in order to stay a SEAT

if you have TCS ( with free EDL) it cuts power -if in a straight line - open differential so both wheels would spin (i think), but if your pulling out of a junction -says up to 50mph , so probably corners as well it brakes the spinning wheel - would normally be the inside one , in order to keep it intact ,

will read it again
 
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