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Power Fc Knock Levels On Start Up

viking

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

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MattSR Community Regular

MattSR

Posted
Posted

Ahh yeah you are right - I though he had an RB25 for some reason..

viking, do you have any other mods to your motor? forged pistons or anything else? I dont really think its anything to worry about as the engine isnt undr load at idle/startup so theres not going to be any damage due to detonation. Still interesting to figure it out tho

siksII Grand Master

siksII

Posted
Posted

when i had my stock fuel pump startup knock was never above about 5 or 10

i put in a bosch pump and now sometimes it will be around 40-50

i believe the bosch pump does not have a valve to keep the lines pressurised when the pump is not on, so after it primes if u wait a bit it may be a bit starved of fuel on startup causing the knock.

i have tried a few things and noticed if i prime a couple of times and start it right away it starts perfect, however if i prime once, leave it a while then try and start it may not start at all.

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