4g13 talks

vr2turbo

Beyond 20,000 RPM!
Helmet Clan
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May 11, 2010
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Valve seats sorry. Basically incomplete combustion busting out.


Personally I'd fix it. This kinda thing usually means overhaul. Piston rings and valve seats
I thought valve seats usually smokes when idling. One of my previous car had that, but normal driving no smoke, only at idling.....
 

parakey

1,000 RPM
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Apr 30, 2012
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Kuala Lumpur
I thought valve seats usually smokes when idling. One of my previous car had that, but normal driving no smoke, only at idling.....
During high vacuum situations like idle, cold start and engine braking, engine oil gets suck from the cylinder head into the combustion chamber.
 

lsm1991

1,000 RPM
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Sep 30, 2011
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Btw guys.. is it worth if i were to change my injector to higher cc on stock engine?
what do you think will happen... keep things simple. imagine just dumping more fuel in there, whats the expected result... remember just dumping fuel and nothing else into the combustion chamber
 

Izso

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Helmet Clan
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Mar 28, 2004
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what do you think will happen... keep things simple. imagine just dumping more fuel in there, whats the expected result... remember just dumping fuel and nothing else into the combustion chamber
larger injectors won't shoot more fuel in la. It's just underutilizing the injectors. Not a great thing either
 

Izso

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Helmet Clan
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ehh it will let more fuel in kan...
Let me clarify. The stock injector duty cycle is usually 80%. So say you're using 150cc stock injectors, then you're shooting about 80% in super simple terms.

If you plonk in 500cc injectors it'll be running the default duty cycle of 80% unless you tune it otherwise. So you're shooting 80% of the 500cc inejectors. But that's also assuming your fuel pump can cope with the extra load. If fuel pump is insufficient and injectors not running at it's preset duty cycle, I think something is going to fail pretty quickly.
 

Latebloomer

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May 19, 2020
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Let me clarify. The stock injector duty cycle is usually 80%. So say you're using 150cc stock injectors, then you're shooting about 80% in super simple terms.

If you plonk in 500cc injectors it'll be running the default duty cycle of 80% unless you tune it otherwise. So you're shooting 80% of the 500cc inejectors. But that's also assuming your fuel pump can cope with the extra load. If fuel pump is insufficient and injectors not running at it's preset duty cycle, I think something is going to fail pretty quickly.
So thats mean Ecu come first then larger injector plonk later on?
 

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