Hi all, is there any advantage fitting RX8 yellow injectors to a standard 1.8 engine , just thinking of power gains , cheers
Brief answer: no.
The stock ECU isn’t able to control such large injectors and you’ll just overfuel and likely suffer cylinder wear due to borewash (excess petrol strips the protective oil layer off the cylinder walls).
Longer answer: With an aftermarket ECU which can control those injectors you might gain a tiny amount of power due to the newer injectors superior spray pattern. But the gain would be marginal compared to any benefit from fitting the replacement ECU and getting it carefully tuned. Just adding more petrol doesn’t increase power. There’s an ideal amount of fuel to mix with the air the engine is drawing in and the stock injectors are already more than capable of adding enough for the stock engine.
Hi Martin, thanks for your answer , i will give this one a miss then ,
Cheers
Any upgrade like this needs serious thought.
The RX8, yellow top injectors are usually fitted to turbo charged or supercharged cars with a mappable ecu like megasquirt.
Even then the usual process is to get them cleaned serviced and checked before fitting.
A very complex subject - get it wrong and BOOM as Heavy D on storage wars says.
Stick to standard setup or be prepared to spend a lot of money.
PS eBay is flooded with cheap, poor quality knockoffs of these yellow RX8 injectors. I’d only buy them from vendors with both the expertise to recognise genuine Denso parts among the copies and a reputation to protect.