NSH cruising at 130km/hr

[Friendstar]

so that was the ride with the jerk and stuff right?

 

 

hehe

 

wat's ur current ride neway?

[Dwoon]

Nope, its my current car.

 

old model forester 2.0 XT

[Lightbringer]

will it damage the gearbox ah?

 

so far only happens twice

 

i hope my gearbox is still intact

 

I don't really understand why you have overdrive on when at cruising speed in the first place. Won't it be easier to drive without OD on, and then activate it when you wanna overtake (provided you are not already at your highest gear).

 

In any case I rarely use the OD function since I switch to steptronic whenever I wanna do fancy manouveurs. If I experienced a "clunk" like yours my heart would have definitely sunk as well

[Tigershark1976]

not too sure whether wat u mentioned is normal for AT but for MT, if u drop from 5th gear to 4th gear at 5000rpm. u can definately expect a violent vibration ....

[Blackyv]

Hey forum mates,

 

say u were cruising at 130km/hr on the NSH for 1hour.

 

when u decide to overtake someone, do u turn off O/D (drop to 3rd gear) and then overtake?

 

i tried that on my picnic and there's a violent vibration momentarily.

 

(RPM is still decent at 5k.)

 

the car was fine afterwards, upping gear back to 4th gear and continue its 130km/hr cruising

 

what is the issue?

 

seriously, i dont know why must use OD...... even cruising at 130km/h (~3Krpm) and i wish to overtake, just use my right leg, release slightly/step on it quickly and gear down from 4th into 3rd gear and overtake....(u should know ur car's timing and method to shift gear right?..each car model has it's sweet spot of rpm for gear downshift change ..)

 

i dont think use OD at 130km/h is advisable...

[Blackyv]

i think at 130km/h, the moment OD pressed, im sure the rpm will go up very high (5K in his case it seems) which is why i dont think OD should be activated at that speed and for that purposes... and it doesn't gain much power/acceleration at that speed but maybe more "injury" to the trainy..

[Mtoh]

Hey forum mates,

 

say u were cruising at 130km/hr on the NSH for 1hour.

 

when u decide to overtake someone, do u turn off O/D (drop to 3rd gear) and then overtake?

 

i tried that on my picnic and there's a violent vibration momentarily.

 

(RPM is still decent at 5k.)

 

the car was fine afterwards, upping gear back to 4th gear and continue its 130km/hr cruising

 

what is the issue?

 

1) depends on peak torque of car, eg which rpm

2) Traffic behind u...

3) speed of car u are about to overtake

[Powerhouse]

Sorry to side track abit, Wat about engine oil? 5W30 can hit NS highway?

[En0203]

Hey forum mates,

 

say u were cruising at 130km/hr on the NSH for 1hour.

 

when u decide to overtake someone, do u turn off O/D (drop to 3rd gear) and then overtake?

 

i tried that on my picnic and there's a violent vibration momentarily.

 

(RPM is still decent at 5k.)

 

the car was fine afterwards, upping gear back to 4th gear and continue its 130km/hr cruising

 

what is the issue?

 

no chance. i dropped to high rpm all the time, be it from 4 to 3 or 3 to 2, never jerk except engine getting louder. neither was my previous sunny giving any jerk.

 

u can do a simple test, on ur mazda 3, at around 80 km/h, use manual mode to drop to 2nd gear while maintaining the throttle position, the rpm should match the speed nicely at around 5k rpm before u regain ur power connection, there won't be any jerk except that u'll get a pulling G when u press on the accelerator again.

 

i have been doing that for about 5 years now on both of my cars, don't think got any problem

Edited December 11, 2008 by En0203

[Happily1986]

Bro got error. Toyota's OD is ON by default.

[Vtim]

Hey forum mates,

 

say u were cruising at 130km/hr on the NSH for 1hour.

 

when u decide to overtake someone, do u turn off O/D (drop to 3rd gear) and then overtake?

 

i tried that on my picnic and there's a violent vibration momentarily.

 

(RPM is still decent at 5k.)

 

the car was fine afterwards, upping gear back to 4th gear and continue its 130km/hr cruising

 

what is the issue?

 

At 130 kph, I see no reason why you off OD for overtaking. What makes you think it dropped to 3rd gear? 3rd gear got max speed and it may be less than 130 kph for normal car.

 

auto gear ratios is different from manual, for a 4 speed auto, 130kph is still within the power band of 3rd gear

 

for my 8 seater 2 tonner auto 4 speed, 1st gear max speed is 60kph, 2nd 120kph, 3rd 170kph, as for 4th so far only upto 190kph.

[Tohto]

yea i always keep on the left

 

the right is for the faster cruisers like markx, accord 2.4 etc...

 

You forget to include the heavily mod Kalisa..

[Vtim]

cos my car got show it went to 3rd gear.

 

and when its at 3rd gear the RPM is 5k (my redline is 7-8k). so i supposed its safe

yes, it's still still safe to down shift but do expect a bit of jerk

[Vtim]

will it damage the gearbox ah?

 

so far only happens twice

 

i hope my gearbox is still intact

 

I don't really understand why you have overdrive on when at cruising speed in the first place. Won't it be easier to drive without OD on, and then activate it when you wanna overtake (provided you are not already at your highest gear).

 

In any case I rarely use the OD function since I switch to steptronic whenever I wanna do fancy manouveurs. If I experienced a "clunk" like yours my heart would have definitely sunk as well

crusing even at 90km/h at OD and not at 3rd (for 4speed auto) or at 4th (for 5speed auto) make some diff on the fuel consumption

[Vtim]

Sorry to side track abit, Wat about engine oil? 5W30 can hit NS highway?

I have been using weight 30 oil since I bought my 2nd hand 8 seater 2 tonner and have made at least 10 trips to Genting liao, not an issue at all, unless you are driving a T/C car or a 3L and above V6 engine

[Vtim]

i think at 130km/h, the moment OD pressed, im sure the rpm will go up very high (5K in his case it seems) which is why i dont think OD should be activated at that speed and for that purposes... and it doesn't gain much power/acceleration at that speed but maybe more "injury" to the trainy..

 

for Auto cars, you'll always turn the OD on, so that it will be more fuel efficient when you are crusing on the H/W. Even at 90km/h, with OD on, you'll see that the RPM is lower than 3rd gear (for 4 speed auto) or 4th gear (for 5 speed) auto, so in turn, you are at the best FC.

 

for a 4 speed auto, switching off the OD at 130km/h to let it down shift to 3rd is not an issue as it is still within the power band of engine and have not reach the max RPM. 2 ways of to letting the gear downshift so that one can overtake, 1 is to turn off OD (just like manual downshift from 5th to 4th for a manual car) and the other is to floor the accelerator, which in turn will cause the Auto box to down shift automatically

[Jtis]

Check your engine/transmission mounts for wear and tear. Even when your auto transmission downshifts and rpms spikes upwards to redline, although there will be some shift shock, there shouldn't be violent vibrations. However, when there is an abrupt change in rpms, the engine will rock forward or backwards depending on engine orientation, and if your mounts are worn, vibrations can be felt prominently.

[En0203]

eh.. don't think I can answer you coz never travel at such a constant slow speed on NSH before

 

u speedster