45 replies to this topic

[Nev]

Will be starting the plug and play turbo option in the next few weeks. Matt

I think I can guess who's car that will be on.

[Matthew Bentley Racing Ltd]

Maby :-)

[leevx2.2]

I think this is my problem what do people think could explain other peoples misfire problems http://www.superchar...page=page&id=27

[Nev]

Hi Lee, Here are a few points that may be relevant: 1. Consider tapping the spark plug gaps down to 0.7 or even 0.6 mm, its easily done and can be reversed if it doesn't help. As you are likely pushing close to 2 bar of boost this is deffo a worth while experiment. For reference, I've tapped mine down to 0.7mm and they were fine up to 2.1 Bar of boost. 2. Deffo buy a new coil pack, you are possibly using wasted spark ignition on your new ECU which will hammer your coils 4 times more than before. I recently swapped out my 10 year coil pack (also on a wasted spark ECU) and it helped smooth things a bit. Be prepared to swap you coil pack 4 times as often basically (and also your spark plugs for the same reason). 3. Coilpacks can get heat saturated which can cause variance in their performance, eg rolling road vs road driving. Can you take off any cover that is above them to allow air to flow better? 4. I would image (but its a guess) that a brand new OEM coilpack should easily be able to ignite your mixture. The 20,000 odd volts will jump the gap, even if you ran 3 bar of boost, it's just a matter of reducing the gap, strong battery, clear contact, good engine earthing. 5. Consider a colder running spark plug, they can get too hot which can cause various issues, in particular cracking and crumbing of the ceramic (which can fall into the cylinder and cause a terrible mess). I run the max coldness spark plug (9 I think with no problems). Best of luck, it's a shame you don't live closer, I would have been keen to come over and help out as best I could.

Have you done that lot? I'm guessing so, so I'd suggest trying some other plugs off the shelf, maybe with extra depth to ignite the mixture in a different zone (but be sure to hand crank the engine over to ensure the piston crowns don't strike the electrode). If you are running unusually high boost (for this engine + inlet) you might also have to consider that somehow the inlet charge + mixture is not swirling into the top of the cylinder correctly and/or perhaps the squish design of your pistons is no working like the OEM pitons. I can think of 2 possible ways to check for this: 1. Swap out spark plugs for deeper ones and/or multi electrode ones, to try and ignite the mixture in a different place. 2. Take your inlet manifold off and spot weld in something to try and deflect the inlet charge in the final few inches of each inlet runner. This is clearly not a simple thing to do and possibly risky (if your spot welds aren't good enough!). Good luck, thinking laterally may help, it's not easy pushing the boundaries is it !

Edited by Nev, 09 August 2014 - 05:11 PM.

[Exmantaa]

I think this is my problem what do people think could explain other peoples misfire problems http://www.superchar...page=page&id=27

More run the Harrop without problens, so your's should run just as good. Put simple BKR7E plugs in, gapped at 0.8mm and it should be good for your engine. Still misfiring (excessive, not just the fault code); check coilpack, wiring or crank sensor. Or maybe you map sensor is playing up @ higher boosts? a logfile is very helpfull in these cases. ;-)

[Exmantaa]

Ow, and I assume your exhaust is not blocked by a destroyed kat?