Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: tigers_gonads on 28 June 2009, 12:56:26

Title: car unstable at speed / plastic undertray missing.
Post by: tigers_gonads on 28 June 2009, 12:56:26

did a fair few mile last week and noticed that the car seems to go quite nose light at speed ( 80 upwards  ;) ;) )

have checked all tyres ........ rubber bushes ........ suspension ect  and all seems good  :y

i was carrying alot of weight in the back at the time.

is the missing undertray going to make much differance to the this ?

Title: Re: car unstable at speed / plastic undertray missing.
Post by: Martin_1962 on 28 June 2009, 17:19:27

Check rear springs

Title: Re: car unstable at speed / plastic undertray missing.
Post by: tigers_gonads on 28 June 2009, 17:28:48

checked mate ......... both look ok ( at the top and bottom )  :y

it was sitting pretty low at the back ( no self leveling )

just been for a blat up m62 ( don't ask how fast  ;) ;) ) with the car empty.

pretty much as before ........... started to go light above 80 ish  ;)

its the last time i buy a 500 quid car ........... spent over 700 quid on the heap of sh*t since then  >:( >:(

Title: Re: car unstable at speed / plastic undertray missing.
Post by: duggs on 28 June 2009, 18:23:05

Welcome to the world of Omegas.

I did the same as you, £500 purchase, over £1000 spent to get everything working right.

Great rewards eventually but yes..a pain in the ass meanwhile.

Title: Re: car unstable at speed / plastic undertray missing.
Post by: ngrainqey on 28 June 2009, 18:26:52

lol...spent £425 for my first omega and was spot on ;)
had to do drop links and changed the timing belt anyway and that was it!

Title: Re: car unstable at speed / plastic undertray missing.
Post by: Martin_1962 on 28 June 2009, 18:46:32

Back end down will cause this instability - also take it to WIM for a full geometry check

Title: Re: car unstable at speed / plastic undertray missing.
Post by: Darth Loo-knee on 28 June 2009, 18:58:53

The police would have carried a hell of a weight in the Omega when used as a Plod Car, they would have done silly speeds at times so I can't see weight in the back creating the car to go light at the front :-?

Are your wishbones ok? when going or shafted they steering does dance abit.

Not having a Plastic undertray will perhaps make your car run slightly warmer as the air is escaping and not channeled around the engine then up the gearbox tunnel.

Title: Re: car unstable at speed / plastic undertray missing.
Post by: Diamond Black Geezer on 28 June 2009, 19:43:30

If I remember my Aerodynamics lectures correctly... an engine bay is a right sod of a thing to have in a car. Air blasts downward from the engine bay at all sorts of practicallly-unpredictable angles/speeds. The undertray will help smooth this plenty. They are fitted to help reduce front end lift.

Great, problem solved, I hear you cry! What I dont understand is why the some models get one, others don't. As an educated guess, I'd say the undertray doesnt really make much of a difference. BUT Vauxhall fitted one, didn't they? They didnt fit it for the hell of it.