Bit of weird one. So I’m currently running cosworth management on my s2 it’s fully forged running about 15psi stage 2 t3. The chatter sounds unreal. Now I’ve got a boost monkey ofam ecu and loom I’m looking to swap on to it. Now I’ve been hearing that changing the management effects the high pitch chatter? Can anyone shed any insight on this.

cheers
josh

 

The chatter is simply air being forced backwards through the turbo when the throttle is closed (not good) hence why dump valves exist.

The management simply operates a solenoid (Amal) so won’t make any difference in this regard.

Martin

 

I know a couple people who have swapped from Cossie management to Megasquirt or Omex and the chatter quietens down. Also others that went from EFi to Cossie and the chatter got really intense.

I can't understand why it makes a difference and i don't know what other variables they changed. I would think the "Chatter" is governed by mechanical parts, so the turbo and its pipework etc. So it shouldn't make a difference but somehow it kind of does.

 

Mine at 9psi .

On simtek pro .

 

Thats how mine sounds, nothing like as loud as cossie management chatter.