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RB26 #5 amd #6 compression low........rebuild time

GohiraDave

By GohiraDave,
in Engines & Forced Induction

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r32-25t Grand Master

r32-25t

Posted
Posted
35 minutes ago, GTSBoy said:

Well...... no. They usually run just fine on 98 without a need for a tune. When there was no 98, and 95 was the only option, that's when there was a problem.

The Aussie delivered ones do, the imports don’t. There was a time when everyone used to throw an exhaust on them pull the restrictor out and then the engine let go in 6 month, s13s were prone to it as well 

GTSBoy Grand Master

GTSBoy

Posted
Posted
4 hours ago, r32-25t said:

All performance cars in Japan are tuned to use it and the reason why once the cars are imported to Australia the engines blow up

I quote again. You said "all performance cars in Japan" and imputed that the all blow up once they are in Oz. It's just not true. I removed fuel and added timing to both RB20DET and 25DETNeo base maps, running on 98, and neither engine blew up. The Neo is 10 years deep into that.

joshuaho96 Veteran

joshuaho96

Posted
Posted
33 minutes ago, r32-25t said:

2 cars out of all the cars that were brought in don’t have the issue? Still seen plenty of 25s crush bearings without many modifications 

You guys sure you aren’t just agreeing on basically the same thing? Stock tune, stock engine within reason the Nissan tunes seem pretty safe. The RB26 out here runs ok on 91 AKI which is 95-96 RON. It’s when you run a Mines tune or whatever made for 100 RON super premium that you start seeing engines blow up.

Personally I’m probably going to run wastegate boost and roughly stock timing forever on 91 AKI E10. It’s just terrible fuel and RBs are expensive to rebuild. I might play a bit with boost enrichment thresholds but that’s it. Any additional timing and boost I’d probably want at least E30.

admS15 Grand Master

admS15

Posted
Posted
On 18/06/2023 at 3:06 PM, GTSBoy said:

Well...... no. They usually run just fine on 98 without a need for a tune. When there was no 98, and 95 was the only option and guys ran double standard boost that's when there was a problem.

Fyp

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