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Re: Rev limits
[Re: gillan]
#1537753
12/05/2015 19:42
12/05/2015 19:42
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Joined: Feb 2008
Posts: 1,728 London
kj16v
My life on the forum
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My life on the forum
Joined: Feb 2008
Posts: 1,728
London
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The first limiting factor would be the hydraulic tappets that 20VTs have. As rpm rises, the oil would get pumped out of them until the valves cease to open. However the limit for this is still pretty high - over 8000 rpm. However, whether the rpm limiter needs to be that high is a different matter! The actual limit I would set the limiter at would depend on what rpm the engine makes peak power. I would usually set the limiter anywhere up to 7.5k depending on the engine spec and it's intended use. Maybe more, just depends 
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Re: Rev limits
[Re: gillan]
#1537806
13/05/2015 09:51
13/05/2015 09:51
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Joined: Dec 2005
Posts: 17,386 Staffordshire
Nigel
Forum veteran
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Forum veteran
Joined: Dec 2005
Posts: 17,386
Staffordshire
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I agree with KJ - your choice of rev limit will probably be based on the turbo you've specced
When I ran a GT2871, power was tailing off after 7,000rpm, so the limiter was set at about 7,000. When I had the GT3071 fitted, it was still pulling strongly at 7,000, so the limit has been raised to 7,500
Both turbos were 0.64AR - the bigger 0.86AR turbine housings would make more power at the top end, so the rev limit could be moved higher
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