The difference between sucking & blowing! - Page 7 - Renault Forums :: Independent Renault forum

View Poll Results: In your opinion/experience does air filter choice affect the turbo's lifespan?
Absolutely, more power through greater efficiency - can only be a good thing. 11 64.71%
Keep it standard, that way its the manufacturer's responsibility if it goes bang. 3 17.65%
Don't know/care one way or another. 3 17.65%
Voters: 17. You may not vote on this poll

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post #31 of 71 (permalink) Old 10th July 2008 Thread Starter
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Originally Posted by madnoel10 View Post
Engines always run best on clean dry air as any moisture contained in it will mean less oxygen content.
99% in agreement with you Noel - but there are highly-tuned turbo cars (Imprezas & Evo especially), that give a bit more power (or lose less in high ambient temperature conditions), when fitted with water injection to help lower the air temp.

A rare situation (especially so in this country ), hence the low percentage stated.

Good input.


EDIT: Nice one Pat - you were thinking the same as me!

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Last edited by VelSatisfied; 10th July 2008 at 11:53 AM. Reason: additional point.
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post #32 of 71 (permalink) Old 10th July 2008
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I do belive that the Evos ans Scobys with the water injection spray it over the intercooler to help with the cooling.
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post #33 of 71 (permalink) Old 10th July 2008
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Water injection in some cases increases the density (has a similar effect of increasing the ambient air pressure) of the inlet air and lowers it temperature thus preventing pre-ignition. This only works when the gases going into the engine are an air/gas mix. Whilst it may reduce the risk of pre-ignition and the resulting power loss it will not assist the fuel/air mix to burn more efficiently. On high performance engines this is a bit of a trade-off especially when using high octane fuels which have lower ignition temperature - hence more likely to cause pre-ignition and serious engine damage like a smashed crankcase with a con-rod poking its leg out (in our part of the world this is referred to as calving).

Additionally the metals in the engine will suffer spalling which will seriously shorten engine life but when racing, etc generally that is not a problem as many engine are designed only to last one racing session anyway.
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post #34 of 71 (permalink) Old 10th July 2008
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Originally Posted by owenfackrell View Post
I do belive that the Evos ans Scobys with the water injection spray it over the intercooler to help with the cooling.
Then that wouldn't be injection - would it

It might be into the intercooler, not sure to be honest.

Adding water into the fuel air mix is certainly a performance boost. It increases the compression ratio, and improves the burn rate.
post #35 of 71 (permalink) Old 10th July 2008
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There are systems that spray water on to the fins of the intercooler to cool it,and also water injection systems that spray water into the inlet manifold or anywhere into the turbo pipes after an intercooler.

The water injection systems use high pressure to create more of a mist rather than just squirting water into the system.

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