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R34 RB25 Neo sounds like a diesel

Henrycmk

By Henrycmk,
in R Series (R30, R31, R32, R33, R34)

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Henrycmk Newbie

Henrycmk

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Picked the car up from the dock recently. Fairly low mileage about 100k kms, car looks very well maintained inside and out. Has a hks-gtrs turbo. The car sounds cammed at idle, similar to videos ive found of the tomei 262. There is a very distinct sound coming from cylinder 1 or 2 on the intake side that sounds almost like an exhaust leak or diesel sound. Car drives fine, i have only put about 30 miles on it, still need to do a fluid flush. Any ideas on the sound? Is this how rb25 neos are supposed to sound?https://youtube.com/shorts/eqHXawpgArI?si=v5q8pZQuOrNXYrBQ

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https://www.sau.com.au/forums/topic/485995-r34-rb25-neo-sounds-like-a-diesel/
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Henrycmk Newbie

Henrycmk

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6 minutes ago, GTSBoy said:

Well, it is an unusual noise. Use a 2 foot long bit of garden hose stuck in your ear as a stethoscope to pin it down to a definite location. We'll never work it out across the internet.

I plan to pull the intake manifold off and check the gaskets, i read that the block to manifold gasket can blow over 14psi and when i picked up the car it was set to 1.2bar on the controller. Send the injectors out for cleaning. Ill also pull the cam covers off and do an inspection, check some valve lash. Someone also said that the timing belt can rub or vibrate against the belt cover and make that sound. Definitely need to get an AFR gauge on it, if it was lean idling im sure it wont be happy

GTSBoy Grand Master

GTSBoy

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46 minutes ago, Henrycmk said:

i read that the block to manifold gasket can blow over 14psi and when i picked up the car it was set to 1.2bar on the controller.

Yeah, nah. Not a thing.

The gasket between the top of the plenum and the runners is far more likely to blow out when it gets old, and not really at ~14 psi. These things have been run to double that for 30 years without that being a common thing.

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