172 torque curves

[McBunny]

has anyone got one ??? after mine been rrd at the weekend mine showed up as having a different torque curve to the other standard 172s so id like a look at some others please

 

[Rich-D]

Check the Superchips site mate, theres one on there...

 

[McBunny]

ooh ta

 

[McBunny]

this is mine and i think i know one of the reasons for slow 172s all the other ones tested had a lul at about 4k for about 500rpm it was just flat where a mine ramps straight back up no flatspot

http://erc.qmuc.ac.uk/cliosport/file.php?image=1063619575__torque-curve.jpg

 

[Lee]

Give me 10 to scan mine and Ill stick it up mate. For comparison.

 

[Bryan]

any chance of making it any bigger mike, i cant see it

 

[McBunny]

that is small compared to what it was lol

 

[Lee]

Heres mine:

http://erc.qmuc.ac.uk/cliosport/file.php?image=1063620973__torque1.jpg

 

[McBunny]

yeah yours is different too but has a filter

 

[Rich-D]

How come the torque curve is so variable?!

Not keen on all the peaks & troughs on there and would expect a nice smooth curve like my old 306 Rallye had...

http://members.lycos.co.uk/pug306rallye/Rich_D%20306%20Rallye%20RR%20Graph1.JPGhttp://members.lycos.co.uk/pug306rallye/Rich_D%20306%20Rallye%20RR%20Graph1.JPG



That car had a really nice torque band and pulled really well from low revs.

 

[McBunny]

everyones was like its because its a very large scale

 

[Rich-D]

Quote: Originally posted by dogmaul on 15 September 2003

everyones was like its because its a very large scale

Yeah, not saying it was out of the ordinary for a 172/Cup, but Id prefer a nice smooth, flatter curve like the 306 had.

 

[McBunny]

yours wont be flatter if it was done on a larger curve i dont think mate but on my graph ther is like 1lb ft of torque every like 5 mill where as yours is 10 lb ft every 10mm so all the fine detail is lost on the line so it makes it look smoother

 

[Rich-D]

They both drop like a rock after about 6000rpm though!

 

[McBunny]

yes they do as a huge amount is lost not just a few lb ft

 

[Rich-D]

Yeah, it makes sense to shift earlier in the higher gears...

 

[BenR]

THats caue peak torque occurs at peak VE and after that your fighting a loosing battle until you alter cam profile.

 

[McBunny]

ben any reason as to why mine dont have a flatspot ???

 

[BenR]

have u missed that huge lull at 4k?

 

[Martin172]

Rich-D - im really ignorant about this, but why would you shift earlier in bigger gears? Also, why would that only apply to bigger gears? I thought it was best to shift when the shift light came on?

cheers for your help boys.

 

[Kev.]

Where is the shift light? My mates got a CUP and i dont think he has one?! Im just about to order my 172 so hopefully i should get a shift light and cruise control

 

[McBunny]

its not a shift light per say its a light thats telling you ya aboutto hit the limiter thats all nowt to do with optimum shift points



and yes ben mine dont have the lul if you look at the plot

 

[Martin172]

so you saying that its not the best time to shift? when is then mate?

 

[McBunny]

it depends on your torque curve mate you need to get it on a rolling road first

 

[McBunny]

it depends on your torque curve mate you need to get it on a rolling road first

 

[RB_172]

Heres mine...does it look about right?

http://erc.qmuc.ac.uk/cliosport/file.php?image=1064054067__graph.jpg

 

[rt172]

The torque curve on my Williams was much, much flatter than those Ive seen for 172s. My old MK2 172 had a curve that was more like a sketch of a mountain range. Might be worth a look at Chrisnnics before and after RSport chip curves. Think the chip gave no more bhp, but smoothed the torque and knocked 0.5 off their 1/4 mile time.

 

[Rich-D]

RB_172 -

What you had done to that then???