knocking noise on front end after exhaust fitted

[deviltronics]

I fitted a ktec stealth and ktec decat yesterday and am getting a faint knocking noise from the front end when the car is driven hard above 4000 rpm, which you can feel through the steering wheel.

I have readjusted the exhaust a couple of times today, but it has not rectified the problem. It is definetly not hitting anything under the car.

Anyone have any ideas of what this could be?

Just a coincidence it has started happening since i changed the exhaust and front discs and pads.

Please help.

 

[edde]

Sounds like somethings loose or cathcing check the whole system for movement.

 

[deviltronics]

i have! about 5 times!

 

[edde]

Jack the car iup and get someone to rev the engine see if you can recreate the sound when standing still.

 

[deviltronics]

i have got a ramp, i will do that as it i something i haven't tried.

 

[Gaz_]

The manifold can hit the steering rack when giving it some beans...... its very tight space wise. Sounds something like your new decat might be out of adjustment to me.

 

[deviltronics]

^^^sounds about right, will get it check out, but don't think i will be able to get any adjustment out of that section.

 

[Gaz_]

Is it as off the shelf item? ie janspeed etc? Try getting your hands between the decat/baulkhead its impossible!!

 

[deviltronics]

^^^spot on, just checked it on the ramp and your right there is only about 3 or 4 mm clearance.

so when the engine is revved hard it has the tendecy to tilt back which makes the flange on the manifold/cat pipe joint hit the heat shield on the steering column.

the solution to this is grinding some of the flange off to increase the clearance.

i really can't be arsed to take it apart, will get ktec to do it when I go and see them for the remap in a few weeks. i hope they do it for free as it their product and design fault.

 

[Gaz_]

No worries, glad to help