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Author Advantages of a raised rev limit...
Butler
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8th Feb 07 at 20:48   View User's Profile U2U Member Reply With Quote
If a car peaks at around 6.5k rpm, what are the advantages of buying forged pistons and raising the rev limit another 1k if the power band is already under the standard limit?
AK
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8th Feb 07 at 20:50   View User's Profile U2U Member Reply With Quote
no benifit
Robin
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8th Feb 07 at 20:52   View Garage View User's Profile U2U Member Reply With Quote
it'd be faster on a motorway

[Edited on 08-02-2007 by Robin]
Butler
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8th Feb 07 at 20:52   View User's Profile U2U Member Reply With Quote
So what sort of mods would encourage a car to have a power band which passes the standard rev limit?
Robin
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8th Feb 07 at 20:53   View Garage View User's Profile U2U Member Reply With Quote
cam, headwork, vernier pulley, exhaust bits.
Butler
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8th Feb 07 at 20:53   View User's Profile U2U Member Reply With Quote
So the usuals really, would it depend on the height of the lift in the cam?

[Edited on 08-02-2007 by Butler]
AK
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8th Feb 07 at 20:54   View User's Profile U2U Member Reply With Quote
cams really..

the higher the lift, the further up the rev range the the power band is
Butler
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8th Feb 07 at 20:56   View User's Profile U2U Member Reply With Quote
Im just thinking when I go to uni il have money to spend on a car as I wont be using one often either so I might rebuild an s2 rallye engine, rather than going 16v as everyone else seems to be doing. Its just an idea.

So I was thinking forged pistons, headwork with largened valves, 4-2-1 and straight through pugsport, high lift cam, omex 500 with raised rev limit, r1 or r6 carbs. Any ideas?
Butler
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8th Feb 07 at 20:56   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by AK
cams really..

the higher the lift, the further up the rev range the the power band is

Thats what I was thinking, cheers
Robin
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8th Feb 07 at 20:59   View Garage View User's Profile U2U Member Reply With Quote
I wouldn't bother with the pistons unless the standard ones are really shit
Colin
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8th Feb 07 at 20:59   View User's Profile U2U Member Reply With Quote
Depends where peak power is surely
AK
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8th Feb 07 at 21:01   View User's Profile U2U Member Reply With Quote
you'd prob need pistons if going for lairy cams.

I wouldnt bother. Just whap mild cams, TB's on a 16v engine. Much cheaper, much simpler.
Butler
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8th Feb 07 at 21:02   View User's Profile U2U Member Reply With Quote
Less torque, more boring
Robin
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8th Feb 07 at 21:02   View Garage View User's Profile U2U Member Reply With Quote
that's true.

pistons can always be pocketed though, cheaper than buying forged ones.
AK
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8th Feb 07 at 21:03   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Butler
If a car peaks at around 6.5k rpm, what are the advantages of buying forged pistons and raising the rev limit another 1k if the power band is already under the standard limit?


and forged pistons arent any safer with higher rpm's.

What you'd need to address is rod strenth/bolts and the valve gear.
Ant
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8th Feb 07 at 21:03   View User's Profile U2U Member Reply With Quote
As robin said unless your going for silly RPM it may be an option to have the standard pistons pocketed (if you need to for the lift / duration) the extra £££ can then be spent on getting the whole bottom end balanced.
Butler
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8th Feb 07 at 21:04   View User's Profile U2U Member Reply With Quote
Il bare that in mind.
AK
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8th Feb 07 at 21:04   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Butler
Less torque, more boring


what?

not much less, if any less than what your talking about

160 odd bhp easy isnt shy
Butler
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8th Feb 07 at 21:05   View User's Profile U2U Member Reply With Quote
Hmm seems everyones doing that these days though, but yeah I can see why.
AK
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8th Feb 07 at 21:05   View User's Profile U2U Member Reply With Quote
yup....
Robin
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8th Feb 07 at 21:06   View Garage View User's Profile U2U Member Reply With Quote
torque is for motorways, a high revving 16v engine would be better for trackdays or whatever than a torquey one, hence why no-one uses diesels as track cars...
T5POL
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8th Feb 07 at 21:36   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Robin
...hence why no-one uses diesels as track cars...




VW Cup MKV Golf TDi. It won 2 rounds last year and was in top 3 for another 3 of the rounds.
Butler
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8th Feb 07 at 21:38   View User's Profile U2U Member Reply With Quote
I suppose your right there Robin.
Robin
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8th Feb 07 at 21:49   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by T5POL


VW Cup MKV Golf TDi. It won 2 rounds last year and was in top 3 for another 3 of the rounds.


Shhhhhhhh
Cupra Steve
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8th Feb 07 at 21:50   View User's Profile U2U Member Reply With Quote
and the use one of the vw vans!!! Was in PVW a while ago, they were really quick!!!

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