Metallic rattle after Remap

[UnCl3RoRy]

I had a remap done the other day, and when you give it some wellie, it reaches about 4/5000 rpm and there is a tinny metallic rattle coming from the back of the engine. (towards the cab)

any ideas what it could be? I never noticed it before it was remapped.

The noise does not effect the performance.

any thoughts would be greatly appreciated, thanks.

[Nino]

Sounds like the propeller on the turbo 

[rio_gti]

Put a vid of it up?

Could it be hear shield?

[viperjsy]

I think it would be the heat shield

[UnCl3RoRy]

Like i said, it doesn't effect the performance, so if a propeller was broken , I would notice problems with performance, and I would of surely noticed it before anyway?  And I would notice when the turbo first spools correct? At first spool it's absolutely fine.


I have tried a video but it wasn't very clear so I will try again tomorrow.

[Wayne]

It might be pinking which could be serious if left.

[Kruga]

I can almost guarantee its your heat shield exact same thing started happening to mine once i had it remapped took the heat shield off and no longer any rattling

[UnCl3RoRy]

Ive had a play with the heatshield today, found one of the rings what holds the shield one was really loose, so ive tried my best to make it hold a bit better,

out of curiosity, what is pinking, how is it checked? ive had the water pump and timing belt done only a couple of thousand miles ago.

thanks for the advice

[Wazzzer]

pinking is pre detonation, ie your mix is too hot/lean with not enough fuel. The mixture ignites before the spark as the cylinder temperatures are sky high leading to all sorts of problems and can result in a nice bit of piston soup if it's really bad

[UnCl3RoRy]

I think it was the heatshield, managed to secure it back into position,

if it continues i think i will just remove it.

thanks for all the help