detonation problem

[shez]

Hi,

Took my twin turbo to Pip at WGT today to have the apexi power fc mapped.  It previously had a Redom ECU fitted which was running fine.  Unfortunately when Pip tried to set it up it was detonating badly.  At first we thought it was down to the plugs and leads which were well and truly knackered, but replacing them made no difference.  To cut a long story short, Pip replaced the power fc, coil pack and ignitor (amplifier) but none of that made any difference either.
In the end we ran out of time and had to put the original ECU back.

Pip is going to get his thinking cap on and see what he can come up with, his initial ideas of what to check next are the wiring loom from the ECU and the crank sensors.

Unfortunately Pip says he has only seen this particular scenario once before and it was never really resolved, as the guy didn\'t want to invest any more cash in further testing and diagnosis.

I hope this isn\'t going to get expensive!

Anyone got any ideas I can throw at Pip?

By the way the only mods I have are de-catted Blitz exhaust & street port, and have done 10K on rebuild.

Cheers.

[shez]

Plenty of viewings on this thread but no answers............deafening silence!

Nobody got any ideas?

I knew if Pip was scratching his head it wasn\'t going to be a simple one but thought some of the rx-gurus   :god among you might have an inkling.....even if it\'s just where to start looking and what to eliminate.

Any suggestions much appreciated.
Cheers.

[Carl]

Mail me please
carl@mazdarotary.co.uk
Regards
Carl

[maximtaylor]

Can you provide any more details, boost, fuelling at the time, revs?

Dyno graph of an aborted run may help?

I imagine Pip has been thorough though, so I\'m kind of reluctant to come up with suggestions that Pip would consider obvious!

[Ricco_04]

That is strange.  The only thing that makes the car detonate is when you put the new ecu in which points to that as the car runs fine on the old one - but as that has been replaced??

Does the PFC rely on other sensors that the old ECU doesn\'t?

[jurgen]

thread hijack did u see my white t88  :Thumbs-up

[shez]

There was a white twin in there, was it in to have the damage to the near side done??

Only joking!  That is one hell of a mean looking car mate.  I was admiring it while I was waiting around.  What was Pip doing to it?  He said it was a dear job!

I\'m hoping to go back next week to get my problem sorted, we have some ideas now thanks to Pip and Carl.

[iaint]

C\'mon Carl & Max - this is exactly the kind of thread where puttin gideas out there, even obvious ones, is not just a benefit to Shez but to everyone else who may encouter this problem at a later date!  You never know, Pip may actually have missed something really obvious - we all do that from time to time.

[maximtaylor]

I think Geff has already been in discussion with Pip, so Pip is investigating cures for you Chez

[jurgen]

:Laugh am getting 1600 cc injectors fiitted ,apexi ecu, water injection,chrome ast, full service the works all oils and coolants.

and am getting new apex seals in it and of course then mapped and while its there am changing the t88 bearing on turbo to a better on so it spools up even better.  :mmmm

[jurgen]

the car also has a shot peened crank, mazdaspeed baffle plate, uprated tips, ported to the hilt along with the manifolds done.

cant wait till its finished but sadly i have had offer of around 20k for it  :confused:

[shez]

Thanks for the impassioned plea Iain!

I have an appointment with Pip next week so fingers crossed he will suss it out.  I will post the solution if we do get to the bottom of it, provided Pip doesn\'t mind me giving away any of his secrets.

I know Pip has been talking to one or two fellow experts, but you never know, there may be someone reading these posts with experience of this problem who Pip doesn\'t know, so thought it was worth posting the question.  Anyway like Iain says it may help someone out in future.

Jurgen - you can\'t sell it after having all that done surely?  If it\'s finished by next Friday I\'ll take it for a quick "road test" for you if you like!

[jurgen]

i buy and sell jap cars mate