Something up with this 172!?

Its also worth pointing out that the phase 2 172's (non Cup) are pretty much the slowest of the 1*2 varients as they are the heaviest.

A fastchip remap can cure the lumpy idle.

http://www.fastchip.nl/
 
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^^Gord^^ said:
In my experience a car has to be very quck to actually push you back into the seat. We've talking 0-60 in 4.5 seconds or quicker.
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That's what i've always imagined.
The thing is though i've noticed that in my friend's fabia vrs i get pushed back in the seat enough to make you take notice when he accelerates in any gear which makes it feel like it's a fast car yet i know it isn't. Yet in a dc2 or 328 (328 having similar torque as the fabia) you don't feel anything like it
Still trying to properly get my head round torque

obviously if we're talking proper "i can't move i'm stuck in the seat" torque it needs to be quick
 
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Depends if you're driving or a passenger. Passengers don't have a wheel to hold on to so they feel acceleration a lot more. But yeah, for a driver to properly feel it it needs to be pretty darn quick. Sub 5 sec IMO. Though it's pretty subjective.
 
I would have thought you would feel the acceleration though. I mean it weights around 1000kg and has ~170bhp. But these type of cars are never good with 3 people in them though as they add to the weight.

All the cars I have been it that effectively pin you into your seat have been turbo charged cars with 200bhp+, its the turbo rush you get :D Oh and the Tuscan was rapid but had a different sense of speed :)
 
Turbos's always feel quicker than they actually are. I had a '77 Saab 99 turbo, only 145bhp but you'd get pinned in your seat when it kicked in - 0-60 was about 8 seconds, 50-70 was about 4 seconds in 3rd gear....which for a 30+ year old car is pretty good...
 
[TW]Fox;12733295 said:
It's not acceleration as such that pushes you into your seat it's the rate of acceleration change is it not?
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it's acceleration


as for 172s being lumpy, they shouldn't really - i'd get a proper garage to double check the timing, you can't simply use tippex to mark pulley locations when changing it - it requires the cams locking, pulleys locking and the crank locking as all the pulleys are on a friction fitting

if the timing is out it will affect the power
 
[TW]Fox;12733295 said:
It's not acceleration as such that pushes you into your seat it's the rate of acceleration change is it not?
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Yep, your body muscle reaction forces go out of calibration.... very amusing when a guy had a m2 VR6 charged Golf. When he changed gear everyone lurched forwards cos they were resisting the acceleration.

Its the change in acceleration that does it, not purely acceleration.
 
[TW]Fox;12734010 said:
So why does a turbo diesel lardy barge thing give you a bit of a shove in your seat yet takeoff on a Jet airliner does not?
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ermm.. when was the last time you went on a plane!
 
So assuming two cars can reach the same speed in the same amount of time

If one of them has an increasing (changing) rate of acceleration then it will push you back in your seat yet if the other car has an already high but constant rate of acceleration it won't?
 
they both will

but the one constantly accelerating one will push you into your seat at a constant force.. the one with the varying acceleration will push you into your seat with various force - in that example, less at the beginning, more at the end
 
Ev0 said:
150lb-ft for an oldish 2 litre NA is/was pretty respectable I thought? Although I do realise the F4R peak torque is up the range a bit.

As for the OP, if it isn't just him being a girl (:p although against a tuned diesel when rolling there probably won't be masses in it) if it's had a cambelt change recently make sure it's been timed up correctly. One chap over on Cliosport was majorly down on power and it turned out the garage had the timing a bit out.

People do say they are a little lumpy on idle, but mine's always been fine (as was my old F7P too).
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The Renault data for the engines is 125Nm torque at 5500rpm for the F4R engine running approx 200bhp (so the 197 incarnations) I expect the torque figures are not significantly different for the 172/182 as the power increase came from modifications outside of the engine.

F7R engines run at 175Nm at 4500rpm.

I'm not sure what the conversion figures are for lb/ft but I think F7R is 150lb/ft as you stated.

My cup certainly didn't have as much torque as my Willy, so I stand by my original statement :)
 
Jonnycoupe said:
Yep, your body muscle reaction forces go out of calibration.... very amusing when a guy had a m2 VR6 charged Golf. When he changed gear everyone lurched forwards cos they were resisting the acceleration.

Its the change in acceleration that does it, not purely acceleration.
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I think you may be right. It's partly about your muscles resisting the acceleration.

As an example... a few weeks ago I hit the rev limiter unexpectedly in 3rd gear from very hard acceleration and when it hit the limiter I went flying forwards with a huge force. Even my hand on the gear knob went flying off :rolleyes: Glad I wasn't wearing harnesses as probably would have done my neck in :o:D
 
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