Optimum gear change ?

Dave H · Nov 6, 2009

What are the optimum engine revs to change gear when trying to extract the maximum 0-100 times from a 182 ? And what revs should you hold before dumping the clutch ? (In the dry of course...on a private tarmac runway

)

Mark One · Nov 6, 2009

wait till it goes "raaan, daaan, daaan, daaan daaan" and then change.

kevin.s · Nov 7, 2009

think its about 6500 rpm optimum

ForceIndia · Nov 7, 2009

For max accleration, you want to change up at peak power iirc. 6500rpm according to book figures.

Fletcher · Nov 7, 2009

Just before the t**t light (shift light

) flashes up.

mark123 · Nov 7, 2009

Use the shift light.

It is not as simple as peak power as the lower gear will still give you better acceleration for a few hundred revs after peak power than if you shifted up.

Jonny1*2 · Nov 7, 2009

mark123 said:
Use the shift light.

It is not as simple as peak power as the lower gear will still give you better acceleration for a few hundred revs after peak power than if you shifted up.

Ditto, that's what it's for after all.

ForceIndia · Nov 7, 2009

Shift light? Really? It's not a shift light guys!

172Ben · Nov 7, 2009

LOL at the shift light again.

You want to change above peak so when the revs drop your still on cam i would of thought?

Thats what i do anyway, brap brap! :race:

Jonny1*2 · Nov 7, 2009

warren4 said:
Shift light? Really? It's not a shift light guys!

what do you mean it's not a shift light?

172Ben said:
LOL at the shift light again.

You want to change above peak so when the revs drop your still on cam i would of thought?

Thats what i do anyway, brap brap! :race:

To be fare mate, yours isn't standard (can't remember if it's remapped), but the change indicator (shift light

) will probably be wrong for your car setup. If that makes sense

ForceIndia · Nov 7, 2009

It's not a shift light, have a read up.

Jonny1*2 · Nov 7, 2009

really? in the handbook it says gear change indicator.

*off to do a search

*

ForceIndia · Nov 7, 2009

It's a Renault. In the handbook it says lots of things

.

Jonny1*2 · Nov 7, 2009

warren4 said:
It's a Renault. In the handbook it says lots of things.

Fare point

. I suppose going off the RR graph, around 6600rpm would be a better time than any

ForceIndia · Nov 7, 2009

http://www.datsuns.com/Tech/whentoshift.htm

Henry · Nov 7, 2009

haven't timed it (Mark may have done?) but, just from feel, i'd not noticed the benefit in taking it much past 6.5k. you're comparing the acceleration you gain from the waning power/torque/whatever (past 6.5k) with the torque in the next gear (which is stronger imo)

ed. if you wanted to, you could probably see what's what by looking at a power/torque graph, using the mph/1000 in each gear (which are probably both on here somewhere)? is it that simple? presumably drag factors in somewhere as well. dunno

davebem · Nov 7, 2009

The shift light comes on 300rpm before the limit in that gear, so if your on a track and concentrating on where your going and the position of your car, the shift light lighting up in the bottom of your view is the best thing youve got. 300rpm is just enough time to react and change gear so its not far off a "optimum gear change light".

Jonny1*2 · Nov 7, 2009

thats what I was thinking. I guess technically not optimum, but probably the origonal intention.

Andyman · Nov 7, 2009

Of course its a shift light

Its just wrote by Renault in a ''political correct way'' as a optimum gear change light so as not to encourage folk to hash it on the road.

Look at the workings of it, its exactly the same as a shift light so whats the difference apart from the wording? nothing

Look at it another way, you can only really use it legally on the road in the first 2 gears

ForceIndia · Nov 7, 2009

It's not a shiflt light. A shift light activates at the optimum change point. This activates just before the limiter. You'll go quicker changing up slightly before the light.

TimR26 · Nov 7, 2009

It's not a Shift Light because it comes on in 5th gear as well

theduck · Nov 7, 2009

Its not a shift light, its a 'your about to hit the limiter light'

Fletcher · Nov 7, 2009

atouba said:
It's not a Shift Light because it comes on in 5th gear as well

How do you know that then Tim

SBV116 · Nov 7, 2009

What about the shift beeeeeeeeeeeeeep?

Fletcher · Nov 7, 2009

SBV116 said:
What about the shift beeeeeeeeeeeeeep?

Only 200's have that

Andyman · Nov 7, 2009

Do they both let you know when to change gear? Yes, so its the same thing

If you fit a shift light its up to you to find the optimum

Craigus · Nov 7, 2009

Fletcher said:
Only 200's have that

Is that right, I saw a video on youtube of a 200 and noticed it, thought it was cool,

Best thing about the 200 lol,

Chris205 · Nov 7, 2009

warren4 said:
Shift light? Really? It's not a shift light guys!

Because you decided its not im presuming? or somebody else did and you followed suit?

I would imagine its a redline warning light, so really a shift light, otherwise it wouldnt be there

Andyman · Nov 7, 2009

http://dictionary.reference.com/browse/optimum

Optimum, the best or most favorable point.

Renault call it a optimum gear change light and you set a shift light to light up at a optimum point. Its exactly the same idea just worded different.

Jonny1*2 · Nov 7, 2009

Fletcher said:
How do you know that then Tim

Must have seen someone redline on the RR

Fletcher · Nov 7, 2009

Craigus said:
Is that right, I saw a video on youtube of a 200 and noticed it, thought it was cool,

Best thing about the 200 lol,

Yep

Jonny1*2 said:
Must have seen someone redline on the RR

haha..:rasp:

Lee-182 · Nov 7, 2009

dont say shift light on this forum, I said it once and got bummed

TimR26 · Nov 7, 2009

Fletcher said:
How do you know that then Tim

Autobahn IIRC

cliosportcraig · Nov 8, 2009

Renault have it down as a "Gear change indicator"

ForceIndia · Nov 8, 2009

Andyman said:
http://dictionary.reference.com/browse/optimum

Optimum, the best or most favorable point.

Renault call it a optimum gear change light and you set a shift light to light up at a optimum point. Its exactly the same idea just worded different.

The optimum revs to change up is different for each gear. On standard engines power falls away after 6.5k iirc. I love the notion of "it said so in the manual, so it must be true". In the brochure the steering wheel is called leather.

Andyman · Nov 8, 2009

Where it comes in at it totally irrelevant.

The Renault lights up at the optimum. You set a aftermarket shift light to change at your optimum point.

Its exactly the same principle and end result ie, it lights up you change gear

ForceIndia · Nov 8, 2009

Andyman said:
Where it comes in at it totally irrelevant.

The Renault lights up at the optimum. You set a aftermarket shift light to change at your optimum point.

Its exactly the same principle and end result ie, it lights up you change gear

No it doesn't FFS. The optimum point is around 6.5k. I give up.

Jonny1*2 · Nov 8, 2009

warren4 said:
No it doesn't FFS. The optimum point is around 6.5k. I give up.

lol. now count to 10 and breath

mark123 · Nov 8, 2009

warren4 said:
No it doesn't FFS. The optimum point is around 6.5k. I give up.

Prove it!

I'm doing the maths but at the moment I only have the ratios from my 182 and torque curve from my 172 and the numbers are so finely balanced that I need to get the ratios for the 172. I'll post when I've done it.

Lewb · Nov 8, 2009

Doesn't really matter that much where max power is - it's probably faster to change after the 6500 rpm mark since then you wil be closer to max power in the next gear, and a few hundred rpm above 6500 will probably still be producing more power than what the revs drop to if you change gear.

I change gear at around 7100 personally when trying to get a decent 0-100 - (my limiters set to 7500).

Optimum gear change ?

South Central- West Berks

South Central- West Berks

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