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R33 Gts25t

Mattw_83

By Mattw_83,
in Engines & Forced Induction

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Mattw_83 Community Regular

Mattw_83

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Is there any fundamental reason im missing that would be causing the engine to ping???? i have basic knowledge only.

ECU has been remapped. r34 SMIC. Full exhaust. EBC. AFR 11.6 or thereabouts.

Of late the car has developed engine rattle on booth boost settings (10 & 12). Ive since had timing reduced from the CAS whilst i find out whats the cause. On 10psi it produced around 185RWKw on the dyno with apparently no rattle after timing was reduced slightly. Ive since noticed it ping slightly on the street (had a few warmer days) on 10psi.

I suspected faulty fuel pump (its standard), but surely if thats the case you would see the mixtures leaning out?? This isnt happening.

Any ideas would be appreciated. i just purchased a return flow intercooler (justjap) in a hope this might rectify it somewhat. Im also going to grab a Bosch 040 just to be sure. The plan was to be able to confidently run 12psi achieving around 200RWKw without the engine pinging its fkn brain out. Many others before me have achieved this.

This week out of curiosity i filled it with 98 octane PLUS Nulon Octane Booster at 30 bucks a bottle. It seems to have helped but surely this isnt a necessity to run without detonating?? Is there anything obvious to check and/or recommend replacement whilst im having the intercooler and fuel pump installed???

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https://www.sau.com.au/forums/topic/285122-r33-gts25t/
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