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View Poll Results: The highest safe constant revs?
2000 rpm 0 0%
3000 rpm 1 6.67%
4000 rpm 5 33.33%
5000 rpm 9 60.00%
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Old 23-05-2006   #1
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Damaging Revs

What would you say is the maximum amount of constant revs in any gear, that won't bugger your car?
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Old 23-05-2006   #2
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Re: Damaging Revs

fire engines love the high revs
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Old 23-05-2006   #3
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Re: Damaging Revs

the ecu has a rev limiter built in anyway so as long as you dont go mad with the go faster pedal then it will be ok
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Old 23-05-2006   #4
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Re: Damaging Revs

True cuts out at about 7500

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Old 23-05-2006   #5
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Re: Damaging Revs

the 1242 should limit around 6500, 1108 around 7200

I would happily drive along at 5k + in my 1242 cinq.
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Old 23-05-2006   #6
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Re: Damaging Revs

So if your on a long motorway journey keeping a constant of 5000 rpm wont harm you engine?
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Old 23-05-2006   #7
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Re: Damaging Revs

mine will sit happily at about 5800rpm in 4th. in 5th it'll be around 5000 maybe higher. hasn't done any harm to it so it's all good
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Old 23-05-2006   #8
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Re: Damaging Revs

You could sit at 5200rpm for hours going down the motorway, and no harm will come to your engine. The ecu controls the rev limiter, which is there to stop the engine revving to dangerous levels.
Your engine could probably cope with upto 6800rpm for a few hours, but the rev limiter is set below, for a few reasons. The main one being, that the power drops off after 5500rpm, (when you tune your engine, this is why a "chip" will raise the limiter, as the power band will probably raise, my GT limited at 7300rpm!!!), so there is no advantage to rev over that, and keeping the revs lower, will help reduce componant wear. Also, engines are fine revving under load, but they don't like "free" revving as much, though as long as your not one of these numptys that sit in a car park on rev limiter in neautral, I wouldn't worry.
It's not advisable to keep hitting the limiter though, as the engine slows down and speeds up again very quickly, a few times a second, which means more stress on the engine.
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Old 23-05-2006   #9
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Re: Damaging Revs

Erm, so normally when i am trying to accelaertae quickly i will change at the red line on my cinq, but i have a couple of time gone over, to about 7k, the power hasnt dropped off, and i haevnt felt a rev limiter, is there a rev limiter on a cinq or did fiat not splash out? and where should i be changing, at the red line or at the limter, if it exists?
I have a stock 1108 engine, with Eon2s, magnecor KV85s and a cold air intake.
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Old 23-05-2006   #10
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Re: Damaging Revs

I think all Fuel Injected cars have Rev Limiters unless they have been removed.

Carburettors don't so will just go up until your engine goes BANG!

5000 is fine in fifth and cruising on the motorway, though it probably means you will be breaking the speed limit
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Old 24-05-2006   #11
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Re: Damaging Revs

Quote Originally Posted by Trancendental

5000 is fine in fifth and cruising on the motorway, though it probably means you will be breaking the speed limit
depends how healthy your clutch is!

Cinqs limit at 7200, but normal ones run out of power before then.
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Old 25-05-2006   #12
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Re: Damaging Revs

all engines love constant revs' its just how many revs.

as has been said, an engine reving with no load is a bad idea, when we were running in our wild single cylinder engines for our formula student car, we had to fit them to the dyno to run on.

big end and crank bearings will wear faster as the friction is higher at higher revs(I think, well I should know but its late) so more heat is generated, and more heat = more wear and distotion, as the engine can't get rid of the heat any better than it can at lower revs (unlike old volvos that have a fan on the engine of the engine running all the time!).

fire engines will happily rev 4-5k all day, I don't rev mine beyond 4,200rpm really, theres no point, doesn't generate that much more power and the gearbox doesn't like shifting at such rev's, you can feel it baulk under the stress
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