Jump to content

G4 Atom coils issue

Recommended Posts


I am tuning a 1.8t audi engine on G4 Atom and it is having spark blowout on boost. Afr is good, I closed the spark plug gap to 0.5mm, engine compression is good still has spark blowout. Engine is producing 330whp at 1.5 bar boost. The coils in the car are stock with a 3 pin connector as found below:


I tried swapping them with audi r8 4pin (red coils) but ecu didnt want to fire them. 
According to info i found online the difference in wiring between the 2 coils is one extra ground wire on the Audi R8 coils. 

I couldnt find the issue so far so just checking before i get deeper, is g4 Atom compatible with audi r8 coils? 

Thanks in advance,


Share this post

Link to post
Share on other sites

Those 3 wire coils are non-amplified coils, they will need a separate ignitor to drive them.

The Audi R8 coils however have an ignitor built-in and should work fine.  Be aware there are at least two different pinouts for the common 4 pin VAG coils so check you have it correct.

Audi R8 should be like this:



Share this post

Link to post
Share on other sites

Thank you Adam. I swapped the coils the problem persists. I just noticed in the log dwell is erratic falling to 0.7 randomly at 2-3k rpm. Cant see the reason in calibration all looks ok. Dwell is not erratic at high boost and rpm however spark breakout/missfire is terrible. Anyone has any ideas what could be the issue? I tried spark plugs as well no cure. I am suspecting trigger issue or emi... will check if trigger wiring shielding is properly done.

Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...