tempermental speedo and weird throttle response

[Benb1988]

picked up my 1st 172 cup on monday ... Been driving around abit and ive noticed that i dont seem to get the same throttle reponse in 4th and 5th as i do in 1st, 2nd and 3rd. It feels like i have to press the pedal down abit further in 4th and 5th to get the car to accelerate :s

As for the speedo that just seems to work when it wants but i did notice that when the speedos not working the car picks up better in 4th and 5th....

any help would be much apprecaited

 

[edde]

Haver a look at the speedo sensor its in the gearbox checks its in one piece

 

[badman1972]

Mine did exactly the same mate, checked speed sensor, all seemed ok but still not working reliably , so changed it for a new one and now works perfectly!

 

[Benb1988]

thanks.... will have a look tomorrow

 

[Benb1988]

so ive changed the sensor seems to have solved the speedo problem but throttle response is still poor any ideas?

 

[edde]

so ive changed the sensor seems to have solved the speedo problem but throttle response is still poor any ideas?

Maybe best top get the car on a renault computer see if the map sensors acting up or TDC etc

 

[MatBat]

Sorry to dig up an old thread but I'm having the exact same issue.

I would have excellent throttle response in 1st-3rd but in 4th you would need to push the pedal down a fair way more than the other gears. When the speedo stopped though the throttle response in 4th suddenly improved.

I have replaced the speedo sensor fixing that issue but still have the lackluster throttle response in 4th gear.

Did you ever find out what it was caused by?

 

[adamlstr]

Mine has always done exactly the same in 4th/5th, it's definitely a deliberate feature IMO.

My speedo is currently intermittant, and when it drops out (and can't calculate the gear you're in) the throttle response changes while in gear.

 

[MatBat]

Thanks Adalis, maybe I'm worrying over nothing then.

I only started to notice it when the speedo dropped out, but now i know it's there it's really annoying.

I wonder what reason there was for this feature? I could understand it in 1st gear to limit wheelspin etc but in 4th/5th seems to be an odd gear to choose.

I wonder if there is a gear-position sensor that can be unpluged......

 

[adamlstr]

I _think_ it just does a speed/revs calculation, doesn't seem like anything as clever as gear sensor.

When the speedo isn't working the throttle response is a bit much in 4th/5th for motorway use, you barely have to put any pressure on the pedal to do 80+. I imagine it's done for motorway drive-ability.

 

[MatBat]

I guess that does make sense for cruising on the motorway.

For a B-road blaster though I'd personally like it to be crisp the whole way through.

I wonder if an RS-Tuner map would alter it. At least I know I'm not alone and the car is driving as it should!